[ { "path": "README.md", "content": "# 카카오 추천팀\n\n## 소개\n\n카카오 추천팀은 카카오의 다양한 서비스에 추천 기술을 제공하고 있습니다.\n\n추천팀에서는 아래와 같은 업무를 하고 있습니다.\n\n- 추천 기술 고도화 (방향: 사용자의 장기적인 서비스 만족도 증가)\n- 추천/ML SaaS 플랫폼 개발 (방향: 높은 품질의 추천 기술을 쉽게 가져다 사용할 수 있는 플랫폼)\n- 대규모 추천 서비스를 지탱할 수 있는 안정적이고 효율적인 플랫폼 구축\n\n저희에게 궁금한 점이나 하고 싶은 이야기가 있다면 [Discussions](https://github.com/kakao/recoteam/discussions)를 이용해주세요.\n\n## 영입 지원 링크\n\n(현재는 진행 중인 영입 공고가 없습니다.)\n\n## 영입 기출 문제\n\n추천팀 영입 과정에서 실제로 사용했던 기출 문제입니다.\n\n- [Mini Reco](programming_assignments/mini_reco)\n- [Jukebox](programming_assignments/jukebox)\n- [Beale Ciphers](programming_assignments/beale_ciphers)\n\n## 오픈소스\n\n추천팀에서 공개한 오픈소스 소프트웨어입니다.\n\n- [TOROS Buffalo](https://github.com/kakao/buffalo) - A fast and scalable production-ready open source project for recommender systems\n- [TOROS N2](https://github.com/kakao/n2) - lightweight approximate Nearest Neighbor library which runs fast even with large datasets\n- [python-ssdb](https://github.com/kakao/python-ssdb) - Python client for [SSDB](https://github.com/ideawu/ssdb)\n\n## 지식 저장소 (논문 리뷰)\n\n추천 관련 학회의 논문들을 읽고 정리한 것을 공개/공유하는 저장소입니다.\n\n- [카카오 추천팀 지식 저장소](paper_review/README.md)\n\n## 발행 문서, 발표 영상 자료 모음\n\n공개적으로 발행한 문서나, 발표 영상을 아래에 모아놓았습니다.\n\n### 테크 블로그 / AI 리포트\n\n#### 추천팀 소개\n\n- `2022-06-17` [‘AI 추천 기술’을 선도하는 카카오 추천팀을 소개합니다.](https://tech.kakao.com/2022/06/16/data-recommendation-system/)\n- `2021-11-02` [charlie의 추천팀 인턴 생활기](https://tech.kakao.com/2021/11/02/charlie-internship/)\n- `2021-03-11` [카카오 AI 추천을 소개합니다.](https://tech.kakao.com/2021/03/11/kakao-ai/)\n- `2020-06-23` [데이터를 기반으로 새로운 경험을 선사하는 추천팀 이야기](https://tech.kakao.com/2020/06/23/recruit-algorithm-ml/)\n\n#### 추천 시스템\n\n- `2023-03-02` [파이썬과 러스트](https://tech.kakao.com/2023/03/02/python-and-rust/)\n- `2022-12-12` [추천팀의 DDD 도입기](https://tech.kakao.com/2022/12/12/ddd-of-recommender-team/)\n- `2021-12-27` [카카오 AI추천 : 카카오의 콘텐츠 기반 필터링 (Content-based Filtering in Kakao)](https://tech.kakao.com/2021/12/27/content-based-filtering-in-kakao/)\n- `2021-10-18` [카카오 AI추천 : 협업 필터링 모델 선택 시의 기준에 대하여](https://tech.kakao.com/2021/10/18/collaborative-filtering/)\n- `2021-06-25` [카카오 AI추천 : 토픽 모델링과 MAB를 이용한 카카오 개인화 추천](https://tech.kakao.com/2021/06/25/kakao-ai-recommendation-01/)\n- `2021-05-20` [카카오 AI추천 : 카카오페이지와 멜론으로 살펴보는 카카오 연관 추천](https://tech.kakao.com/2021/05/20/kakao-ai-recommendation/)\n- `2018-01-31` [카카오내비 예측의 정확성 그리고 AI](https://brunch.co.kr/@kakao-it/193)\n- `2017-10-31` [카카오I 추천 엔진의 진화](https://brunch.co.kr/@kakao-it/136)\n- `2017-06-23` [내 손안의 AI 비서, 추천 알고리듬 - 카카오의 AI 추천 플랫폼, ‘토로스(TOROS)’](https://brunch.co.kr/@kakao-it/72)\n\n### 논문\n\n- [How Important is Periodic Model Update in Recommender Systems?](https://doi.org/10.1145/3539618.3591934) (SIGIR '23)\n- [Predicting Query-Item Relationship using Adversarial Training and Robust Modeling Techniques](https://amazonkddcup.github.io/papers/0620.pdf) (KDD Cup '22)\n- [Simple and Efficient Recommendation Strategy for Warm/Cold Sessions for RecSys Challenge 2022](https://dl.acm.org/doi/10.1145/3556702.3556851) (Recsys'22 Challenge)\n- [An Efficient Combinatorial Optimization Model Using Learning-to-Rank Distillation](https://www.aaai.org/AAAI22Papers/AAAI-4140.WooH.pdf) (AAAI '22)\n- [A Global DAG Task Scheduler Using Deep Reinforcement Learning and Graph Convolution Network](https://ieeexplore.ieee.org/abstract/document/9626004) (IEEE Access)\n- [Melon Playlist Dataset: a public dataset for audio-based playlist generation and music tagging](https://arxiv.org/abs/2102.00201) (ICASSP '21)\n- [How Low Can You Go? Reducing Frequency and Time Resolution in Current CNN Architectures for Music Auto-tagging](https://arxiv.org/abs/1911.04824) (EUSIPCO '20)\n- [FlexGraph: Flexible partitioning and storage for scalable graph mining](https://journals.plos.org/plosone/article/metrics?id=10.1371/journal.pone.0227032) (PLoS ONE)\n- [Artist and style exposure bias in collaborative filtering based music recommendations](https://arxiv.org/abs/1911.04827) (ISMIR '19 Workshop)\n- [Enhancing VAEs for Collaborative Filtering: Flexible Priors & Gating Mechanisms](https://arxiv.org/abs/1911.00936) (RecSys '19)\n- [Sequential and Diverse Recommendation with Long Tail](https://www.ijcai.org/proceedings/2019/380) (IJCAI '19)\n- [Automatic playlist continuation using a hybrid recommender system combining features from text and audio](https://arxiv.org/abs/1901.00450) (RecSys '18 Challenge)\n- [A study on intelligent personalized push notification with user history](https://ieeexplore.ieee.org/document/8258081) (BigData '17)\n\n### if(kakao)\n\n#### if(kakao)25\n\n> \n\n- `2025-09-23` [커뮤니티로 진화한 오픈채팅, AI로 슬기롭게 연결하다 (추천시스템 파트)](https://if.kakao.com/2025/session?sessionId=11)\n\n#### if(kakao)dev2022\n\n> \n\n- `2022-12-08` [실험을 잘한다는 것은 무엇일까?](https://if.kakao.com/2022/session/4)\n- `2022-12-08` [Sequential Recommendation System 카카오 서비스 적용기](https://if.kakao.com/2022/session/8)\n- `2022-12-08` [Explainable Recommender System in 카카오웹툰](https://if.kakao.com/2022/session/9)\n\n#### if(kakao)2021\n\n> \n\n- `2021-11-17` [ML로 기프트권 받을 유저 정하기](https://if.kakao.com/2021/session/26)\n- `2021-11-17` [BERT보다 10배 빠른 BERT 모델 구축](https://if.kakao.com/2021/session/27)\n- `2021-11-17` [TensorFlow Serving보다 10배 빠르게 서빙하기](https://if.kakao.com/2021/session/28)\n- `2021-11-17` [추천 시스템 airflow 2.0 도입기](https://if.kakao.com/2021/session/29)\n\n#### if(kakao)2020\n\n> \n\n- `2020-11-18` [개인화 콘텐츠 푸시 고도화 후기](https://if.kakao.com/2020/session/93)\n- `2020-11-18` [추천 시스템, 써보지 않겠는가? 맥락과 취향 사이 줄타기](https://if.kakao.com/2020/session/125)\n\n#### if(kakao)dev2019\n\n> \n\n- `2019-08-30` [둥꿍둥꿍 느낌 아는 음악 바텐더](https://if.kakao.com/2019/program?sessionId=1bfc0d56-3946-4e40-9ab1-523f16d8594a) - [발표 자료](https://mk.kakaocdn.net/dn/if-kakao/conf2019/%EB%B0%9C%ED%91%9C%EC%9E%90%EB%A3%8C_2019/T08-S01.pdf) / [발표 영상](https://mk-v1.kakaocdn.net/dn/if-kakao/conf2019/conf_video_2019/2_103_01_m1.mp4)\n- `2019-08-30` [Buffalo: Open Source Project for Recommender System](https://if.kakao.com/2019/program?sessionId=c59d4061-6914-4a65-8fb5-f0a0c6c65b93) - [발표 자료](https://mk.kakaocdn.net/dn/if-kakao/conf2019/%EB%B0%9C%ED%91%9C%EC%9E%90%EB%A3%8C_2019/T08-S02-Buffalo.pdf) / [발표 영상](https://mk-v1.kakaocdn.net/dn/if-kakao/conf2019/conf_video_2019/2_103_02_m1.mp4)\n- `2019-08-30` [상품 카탈로그 자동 생성 ML 모델 소개](https://if.kakao.com/2019/program?sessionId=dce0dd84-d054-4b80-8013-b3d58f61bbe8) - [발표 자료](https://mk.kakaocdn.net/dn/if-kakao/conf2019/%EB%B0%9C%ED%91%9C%EC%9E%90%EB%A3%8C_2019/T08-S04.pdf) / [발표 영상](https://mk-v1.kakaocdn.net/dn/if-kakao/conf2019/conf_video_2019/2_103_04_m1.mp4)\n\n#### if(kakao)dev2018\n\n> \n\n- `2018-09-04` [눈으로 듣는 음악 추천 시스템](https://if.kakao.com/2018/program?sessionId=959a3047-0a08-4a42-99ce-35a9210ab49a) - [발표 자료](https://mk.kakaocdn.net/dn/if-kakao/conf2018/%E1%84%82%E1%85%AE%E1%86%AB%E1%84%8B%E1%85%B3%E1%84%85%E1%85%A9%20%E1%84%83%E1%85%B3%E1%86%AE%E1%84%82%E1%85%B3%E1%86%AB%20%E1%84%8B%E1%85%B3%E1%86%B7%E1%84%8B%E1%85%A1%E1%86%A8%20%E1%84%8E%E1%85%AE%E1%84%8E%E1%85%A5%E1%86%AB%20%E1%84%89%E1%85%B5%E1%84%89%E1%85%B3%E1%84%90%E1%85%A6%E1%86%B7.pdf) / [발표 영상](http://tv.kakao.com/v/391418802)\n - `2018-10-01` [눈으로 듣는 음악 추천 시스템](https://brunch.co.kr/@kakao-it/282)\n- `2018-09-04` [TOROS N2 - lightweight approximate Nearest Neighbor library](https://if.kakao.com/2018/program?sessionId=ad6ea793-70e6-495c-b154-c765e6339793) - [발표 자료](https://mk.kakaocdn.net/dn/if-kakao/conf2018/TOROS%20N2%20-%20lightweight%20approximate%20Nearest%20Neighbor%20library.pdf) / [발표 영상](http://tv.kakao.com/v/391419278)\n - `2018-11-21` [TOROS N2](https://brunch.co.kr/@kakao-it/300)\n\n### 카카오 아레나\n\n> [카카오 아레나 서비스 종료 및 데이터셋 다운로드 안내](https://github.com/kakao/recoteam/discussions/9)\n\n- `2018-12-31` [문제 해결을 위한 머신러닝 오픈 플랫폼, 카카오 아레나](https://brunch.co.kr/@kakao-it/321)\n\n#### 3회 대회 (Melon Playlist Continuation)\n\n- `2022-05-27` [카카오 AI추천 : 카카오 음악 추천을 경험해보고 싶다면? Melon Playlist Dataset (feats. Kakao Arena)](https://tech.kakao.com/2022/05/27/melon-playlist-dataset/)\n- `2020-04-28` [멜론 플레이리스트 데이터 탐색 - _카카오 아레나 3회 대회 (Part.2)_](https://brunch.co.kr/@kakao-it/343)\n- `2020-04-22` [멜론에서 음악 추천을 어떻게 할까? - _카카오 아레나 3회 대회 (Part.1)_](https://brunch.co.kr/@kakao-it/342)\n\n#### 2회 대회 (브런치 사용자를 위한 글 추천 대회)\n\n- `2019-07-04` [브런치 추천의 힘에 대한 6가지 기술(記述) - _카카오 아레나 2회 대회 (Part. 2)_](https://brunch.co.kr/@kakao-it/333)\n- `2019-06-24` [브런치 데이터의 탐색과 시각화 - _카카오 아레나 2회 대회 (Part.1)_](https://brunch.co.kr/@kakao-it/332)\n\n### 외부 발표\n\n- `2022-12-22` [Machine Learning Engineer 여행 가이드](/presentations/ksc2022/KSC2022_ML_Engineer_%EC%97%AC%ED%96%89%EA%B0%80%EC%9D%B4%EB%93%9C_%EC%B9%B4%EC%B9%B4%EC%98%A4_%EC%B6%94%EC%B2%9C%ED%8C%80_%EA%B9%80%EC%84%B1%EC%A7%84.pdf) @ KSC 2022\n- `2021-12-15` [우리 생활 속 추천 시스템, 어떻게 발전해왔고 어떻게 발전해나가고 있는가?](https://www.youtube.com/watch?v=jJfXHo7nNe8) @ 데이터 그랜드 컨퍼런스 2021\n- `2021-05-21` [추천 기술이 마주하고 있는 현실적인 문제들](https://www.youtube.com/watch?v=UUY8YEesIVY) - [발표 자료](/presentations/ai_frontier2021/AIFrontier2021_Recommender_system_in_real_world_nick.pdf) @ AI Frontiers Summit 2021\n- `2020-11-25` [유저가 좋은 작품(웹툰)를 만났을 때 (유저의 탐색, 발견 그리고 만족도에 대하여 탐색적 분석하기)](https://deview.kr/2020/sessions/332) @ DEVIEW 2020\n- `2019-08-18` [추천시스템, 이제는 돈이 되어야 한다.](https://archive.pycon.kr/2019/program/talk-detail/?id=136) @ PyCon Korea 2019\n- `2018-08-19` [추천 시스템을 위한 어플리케이션 서버 개발 후기](https://archive.pycon.kr/2018/program/33) @ PyCon Korea 2018\n- `2016-08-13` [TOROS: Python Framework for Recommender](https://archive.pycon.kr/2016apac/program/50) @ PyCon Korea 2016\n" }, { "path": "docs/arena/brunch.html", "content": "\n\n \n \n kakao dataset\n \n \n \n \n \n\n \n
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브런치 데이터셋 다운로드 동의서

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\n 브런치 데이터셋 다운로드 및 이용에 따른 주의사항\n

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\n 본 데이터셋 다운로드 및 이용을 위해서는 반드시 아래 주의사항을\n 확인하여야 합니다.\n

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  • \n 카카오는 데이터셋에 대한 소유자로 정당한 권리를 가지고 있습니다.\n 본 데이터셋은 비영리 연구 목적으로 공증된 관행에 합치되는\n 방법으로만 이용할 수 있습니다. 연구, 논문에 데이터를 이용/인용할\n 경우 ' Kakao (https://www.kakaocorp.com) ’와 같이 반드시 출처를\n 포함하여 표기하여야 하며 제공되는 데이터셋의 무단전재 및 재배포를\n 금지합니다.\n
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  • \n 카카오는 데이터셋을 다른 목적으로 사용함에 따른 정확성, 적합성,\n 유효성을 보증하지 않습니다. 데이터셋 사용에 따른 책임은 전적으로\n 이용자에게 있으며, 카카오는 그 사용에 따른 책임으로 면책됩니다. 본\n 데이터셋 다운로드 및 이용에 따른 주의사항을 위반하거나 데이터셋의\n 다운로드 및 이용 과정에서 카카오에게 손해가 발생할 경우,\n 카카오에게 해당 손해를 배상할 책임이 있습니다.\n
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  • \n 본 주의사항을 읽고 이에 동의를 한 경우에만 데이터셋 다운로드 및\n 이용이 가능합니다.\n
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데이터셋 설명

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\n 이 데이터셋이 제공하는 정보는 2018년 10월 1일부터 2019년 3월\n 14일까지 브런치 서비스에서 수집된 정보의 일부분입니다.\n

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  • \n read 디렉토리: 본 글 정보\n
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    • \n read.tar은 2018년 10월 1일부터 2019년 3월 1일까지 일부\n 브런치 독자들이 본 글의 정보가 총 3,625개의 파일로 구성되어\n 있습니다.\n
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    • \n 파일은 여러 줄로 이뤄져 있으며 하나의 줄은 브런치의 독자가\n 파일의 시간 동안 본 글을 시간 순으로 기록한 것입니다. 한 줄의\n 정보는 공백으로 구분되어 있으며 첫번 째가 독자의 암호화된\n 식별자이고 그 뒤로는 해당 독자가 본 글의 정보입니다.\n
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    • \n 예를 들어 read/2019022823_2019030100 파일에\n 기록된 아래 정보는\n #8a706ac921a11004bab941d22323efab 라는 독자가\n 2019년 2월 28일 23시에서 2019년 3월 1일 0시 사이에\n @bakchacruz_34 @wo-motivator_133 @wo-motivator_133\n 를 순서대로 보았다는 뜻입니다.\n @wo-motivator_133 글이 두 번 나타난 것은 이 글을\n 보기 위해 두 번 방문했다는 뜻입니다.\n
      • \n
        \n
      • \n \n #8a706ac921a11004bab941d22323efab @bakchacruz_34\n @wo-motivator_133 @wo-motivator_133\n
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    • \n 글을 보았다는 의미는 특정 글에 모바일, PC, 앱을 통해\n 접근했다는 뜻입니다. 머문 시간에 대한 정보가 제공되지 않기\n 때문에 실제로 글을 읽지 않고 이탈하는 등의 가능성도 있습니다.\n
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  • \n metadata.json: 글의 메타데이터\n
      \n
    • 643,104 줄로 구성된 글의 메타데이터입니다.
      • \n
    • \n 이 메타데이터에는\n 2018년 10월 1일부터 2019년 3월 14일까지\n 독자들이 본 글에 대한 정보입니다.\n
      • \n
    • \n 작가가 비공개로 전환하였거나 삭제 등의 이유로 학습 데이터로\n 제공된 2018년 10월 1일부터 2019년 3월 1일 전까지의 본 글\n 정보에는 이 메타데이터에 없는 글이 있을 수 있습니다.\n
        \n
      • \n 개발 데이터와 평가 데이터에 포함된 글의 메타데이터도\n 포함되어 있습니다. 즉, 평가 대상자들이 2019년 3월\n 1일부터 2019년 3월 14일 사이에 본 모든 글에 대한 정보가\n 포함되어 있습니다.\n
        • \n
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    • \n 필드 설명\n
        \n
      • \n magazine_id: 이 글의 브런치 매거진 아이디 (없을 시는 0)\n
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      • \n reg_ts: 이 글이 등록된 시간(유닉스 시간, 밀리초)\n
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      • user_id: 작가 아이디
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      • article_id: 글 번호
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      • id: 글 식별자
        • \n
      • title: 제목
        • \n
      • sub_title: 부제목
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      • display_url: 웹 주소
        • \n
      • keyword_list: 작가가 부여한 글의 태그 정보
        • \n
      \n
      • \n
    • \n 메타데이터의 모든 정보는 작가의 비공개 여부 전환, 글 삭제,\n 수정 등으로 유효하지 않거나 변동될 수 있습니다.\n
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  • contents 디렉토리: 글 본문 정보
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    • \n 저작권을 보호하고자 본문에서 형태소 분석을 통해 추출된 정보를\n 암호화하여 제공합니다. 총 7개의 파일로 나뉘어있습니다.\n
      • \n
    • \n 형태소 분석기는 카카오에서 공개한\n khaiii 의 기본\n 옵션을 사용했습니다. 형태소 분석 결과의 어휘 정보는 임의의\n 숫자로 1:1 변환되었습니다. 동일 어휘의 경우, 품사와 관계없이\n 같은 숫자로 변환됩니다.\n
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    • \n 형태소 분석에 대한 설명과 품사의 의미에 대해서는 별도 제공하지\n 않습니다.\n
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    • \n 형태소 추출 전에 텍스트를 제외한 HTML과 같은 내용과 관계없는\n 정보는 제거 했으나 일부 정보가 남았을 수 있습니다.\n
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    • \n 필드 설명\n
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      • id: 글 식별자
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      • \n morphs: 형태소 분석 결과\n
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        • \n 리스트의 리스트로 구성되며, 리스트의 첫 번째 요소는 첫\n 어절의 분석 결과입니다.\n
          • \n
        • 어휘와 품사는 / 구분자로 구분됩니다.
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        • \n 예를 들어 \"안녕하세요 브런치입니다\"라는 문장은 khaiii\n 형태소분석기에서 \"안녕/NNG + 하/XSA + 시/EP + 어요/EF\",\n \"브런치/NNP + 이/VCP + ㅂ니다/EC\" 라고 분석되는데, 이\n 결과는 morphs에서 다음처럼 나타날 수 있습니다.\n [[\"8/NNG\", \"13/XSA\", \"81/EP\", \"888/EF\"], [\"0/NNP\",\n \"12913/VCP\", \"29/EC\"]]\n
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        • \n 여러 줄에 걸친 결과는 개행 구분 없이 리스트에 연속적으로\n 등장합니다. 예를 들어 \"안녕하세요\n 브런치입니다\\n안녕하세요\"의 결과는 다음과 같습니다.\n [[\"8/NNG\", \"13/XSA\", \"81/EP\", \"888/EF\"], [\"0/NNP\",\n \"12913/VCP\", \"29/EC\"], [\"8/NNG\", \"13/XSA\", \"81/EP\",\n \"888/EF\"]]\n
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      • \n chars: 형태소 분석 결과\n
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        • \n 형태소 분석 결과에서 어휘 부분을 문자 단위로 암호화환\n 결과입니다.\n
          • \n
        • \n 한 어휘의 문자는 + 구분자로 결합합니다. 예를 들어 위\n 예의 \"브런치입니다\"는 chars 필드에서 다음처럼 나타날 수\n 있습니다. \"0+1+2/NNP\", \"4/VCP\", \"9+29+33/EC\"\n
          • \n
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        • \n
      \n
      • \n
    • \n metadata.json과 마찬가지로 개발 데이터와 평가 데이터의 글\n 본문도 포함되어 있습니다.\n
      • \n
    • \n contents 정보는 본문이 없는 글의 경우 제공되지 않을 수 있습니다.\n
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  • \n users.json: 사용자 정보\n
      \n
    • 가입한 사용자(작가 혹은 독자)의 정보입니다.
      • \n
    • \n 필드 설명\n
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      • \n keyword_list: 최근 며칠간 작가 글로 유입되었던 검색 키워드\n
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      • following_list: 구독 중인 작가 리스트
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      • id: 사용자 식별자
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      \n
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    • \n 총 310,758명의 정보가 있습니다. 탈퇴 등의 이유로 사용자 정보가\n 없을 수 있습니다.\n
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  • \n magazine.json: 매거진 정보\n
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    • 총 27,967개의 브런치 매거진 정보입니다.
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    • \n 필드 설명\n
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      • id: 매거진 식별자
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      • \n magazine_tag_list: 작가가 부여한 매거진의\n 태그 정보\n
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  • \n predict 디렉토리: 예측할 사용자 정보\n
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    • \n dev.users: 개발 데이터입니다. 대회 기간에 예측한 성능을\n 평가하기 위해 제공한 사용자 3,000명 리스트입니다.\n
      • \n
    • \n test.users: 평가 데이터입니다. 대회 종료 후 최종 순위를\n 결정하기 위해 제공한 사용자 5,000명의 리스트입니다.\n
      • \n
    • \n 일부 사용자는 2018년 10월 1일부터 2019년 3월 1일까지 본 글이\n 없을 수도 있습니다.\n
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  • \n 식별자에 대해서\n
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    • \n 사용자 식별자와 콘텐츠 식별자는 식별자 값에 '_' 존재 여부로\n 나뉩니다.\n
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\n \n\n" }, { "path": "docs/arena/common.css", "content": "@charset \"utf-8\";\n/* 웹폰트 */\n@import url('https://fonts.googleapis.com/css?family=Noto+Sans+KR:400,500&subset=korean');\n@font-face {\n font-family: 'Noto Sans';\n src:url(../font/NotoSansCJKkr-Regular.eot?#iefix) format('embedded-opentype');\n font-weight: normal;\n font-style: normal;\n}\n@font-face {\n font-family: 'Noto Sans';\n src:url(../font/NotoSansCJKkr-Medium.eot?#iefix) format('embedded-opentype');\n font-weight: 500;\n font-style: normal;\n}\n@font-face {\n font-family: 'Noto Sans';\n src:url(../font/NotoSansCJKkr-Bold.eot?#iefix) format('embedded-opentype');\n font-weight: bold;\n font-style: normal;\n}\n/* reset */\nbody,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,textarea,p,blockquote,th,td,input,select,button{margin:0;padding:0}\nfieldset,img{border:0 none}\ndl,ul,ol,menu,li{list-style:none}\nblockquote, q{quotes:none}\nblockquote:before, blockquote:after,q:before, q:after{content:'';content:none}\ninput,select,textarea,button{vertical-align:middle;font-size:100%}\nbutton{border:0 none;background-color:transparent;cursor:pointer}\ntable{border-collapse:collapse;border-spacing:0}\nbody{-webkit-text-size-adjust:none}\ninput:checked[type='checkbox']{background-color:#666; -webkit-appearance:checkbox}\ninput[type='text'],input[type='password'],input[type='submit'],input[type='search'],input[type='tel'],input[type='email'],html input[type='button'],input[type='reset']{-webkit-appearance:none;border-radius:0}\ninput[type='search']::-webkit-search-cancel-button{-webkit-appearance:none}\nbody{background:#fff}\nbody,th,td,input,select,textarea,button{font-size:13px;line-height:1.5;font-family: 'Noto Sans CJK Kr', 'Noto Sans KR', 'Noto Sans', sans-serif;color:#222}\na{color:#222;text-decoration:none}\na:active, a:hover{text-decoration:none}\naddress,caption,cite,code,dfn,em,var{font-style:normal;font-weight:normal}\n/* global */\n#kakaoIndex{overflow:hidden;position:absolute;left:-9999px;width:0;height:1px;margin:0;padding:0}\n.ir_pm{display:block;overflow:hidden;font-size:1px;line-height:0;color:transparent}\n.ir_wa{display:block;overflow:hidden;position:relative;z-index:-1;width:100%;height:100%}\n.ir_caption{overflow:hidden;width:1px;font-size:1px;line-height:0;text-indent:-9999px}\n.screen_out{overflow:hidden;position:absolute;width:0;height:0;line-height:0;text-indent:-9999px}\n.show{display:block}\n.hide{display:none}\n.comm_layer{display:none;flex-direction:column;overflow:auto;position:fixed;top:0%;left:0%;z-index:1000;width:100%;height:100%;background:rgba(0,0,0,0.4);}\n.comm_layer .inner_layer{position:absolute;top:50%;left:50%;background-color:var(--color-white);border:1px solid #cecece;text-align:center;transform:translate(-50%,-50%);}\n.info_layer .inner_layer{top:139px;transform:translate(-50%, 0);width:498px;height:396px;box-sizing:border-box;}\n.info_layer .layer_head{display:flex;justify-content:center;align-items:center;height:80px;background-color:#fee500;}\n.info_layer .layer_head .tit_info{display: inline-block;font-size:21px;line-height:31px;letter-spacing:-1.05px;color:#1E1E1E;}\n.info_layer .layer_head .tit_info .logo_kakaoarena{display:inline-block;width:129px;}\n.info_layer .layer_body{padding:40px 60px 35px;background-color:#fff;}\n.info_layer .layer_body .txt_info{font-size:15px;line-height: 22px;color:#000000;}\n.info_layer .layer_body .txt_info .tit_item{display:block;margin-bottom:22px;font-size:16px;font-weight:bold;line-height:22px;}\n.info_layer .layer_body .link_detail{display:block;margin:30px auto 0;width:175px;height:50px;background-color:#fee500;font-size:15px;font-weight:500;line-height:50px;text-align:center;color:#1E1E1E;}\n.info_layer .layer_foot{display:flex;justify-content:space-between;}\n.info_layer .layer_foot .btn_alert{flex:1;width:50%;height:50px;background-color:#f5f5f5;border-top:1px solid #cecece;font-size:14px;font-weight:500;line-height:50px;text-align:center;color:#1E1E1E;}\n.info_layer .layer_foot .btn_alert ~ .btn_alert {border-left:1px solid #cecece;}\n.comm_layer.show{display:flex;}\n.notice_type{padding: 11px 0 80px;}\n.notice_type .doc-header .inner-header{max-width:1058px;margin:0 auto;}\n.notice_type .logo_kakaoarena{display:inline-block;width:148px;vertical-align:middle;}\n.notice_type .inner_main{max-width:1058px;margin:69px auto 0;}\n.notice_type .tit_notice{font-size:56px;font-weight:bold;line-height:83px;letter-spacing:-2.33px;color:#1E1E1E;}\n.notice_type .txt_notice{margin:28px 0 60px;font-size:18px;font-weight:500;line-height:32px;letter-spacing:-1px;color:#000000;}\n.notice_type .tbl_notice{margin-bottom:33px;border-top:1px solid #979797;border-bottom:1px solid #979797;}\n.notice_type .tbl_notice th,td{padding:0 42px 0;background-color:#fafafa;border-bottom:1px solid #dadbdc;font-size:14px;font-weight:normal;line-height:70px;color:#000000;text-align:left;vertical-align: middle;}\n.notice_type .tbl_notice .tit_item{font-size:15px;font-weight:500;}\n.notice_type .list_notice{margin-left:14px;}\n.notice_type .list_notice > li{position:relative;padding-left:10px;font-size:13px;line-height:25px;letter-spacing:-0.41px;color:#3C3C3C;}\n.notice_type .list_notice > li:before{content:'';position:absolute;top:50%;left:0;width:3px;height:3px;transform: translateY(-50%);background-color:#3C3C3C;border-radius: 100%;}\n.notice_type .link_notice{display:block;width:391px;height:70px;margin:60px auto 0;background-color: #FEE500;line-height:70px;font-size:18px;font-weight:500;color:#1E1E1E;text-align: center;}\n.tbl_comm{width:100%;border:0;border-spacing:0;table-layout:fixed;border-collapse:collapse;}\n" }, { "path": "docs/arena/index.html", "content": "\n \n \n \n \n kakao arena\n \n \n \n \n \n
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\"kakao

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카카오 아레나가 종료되었습니다.

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그동안 카카오 아레나 서비스를 이용해 주셔서 진심으로 감사드립니다. 아쉽게도 카카오 아레나 서비스가 2023년 7월 3일 종료되었음을 알려드립니다.
작성하신 게시글과 제출하신 자료에 대해 백업을 원하신다면 고객센터로 요청 바랍니다.
데이터 백업 기간이 종료되면 게시글과 자료는 모두 안전하게 파기될 예정입니다.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
백업 기간, 백업 대상, 백업 방법으로 구성된 백업 정보
백업 기간 2023년 7월 3일(월) ~ 2023년 10월 4일(수)
백업 대상본인이 작성한 글(글에 첨부된 이미지/파일), 대회 제출 소스 코드와 결과 파일
백업 방법고객센터로 신청 시 이메일로 전달 (고객센터 로그인 필요)
유의사항\n
    \n
  • 백업 기간 이후에는 백업 신청 및 백업이 불가능합니다. 꼭 기간 내에 백업 신청을 완료해 주세요.
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  • 고객센터 백업 신청은 로그인 후 신청이 가능합니다.
    • \n
백업 신청 고객센터 바로가기\n
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\n \n \n" }, { "path": "docs/arena/melon-en.html", "content": "\n\n \n \n kakao dataset\n \n \n \n \n \n \n \n\n \n
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Melon Dataset

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Melon Dataset Download Consent Form

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\n Precautions Regarding the Download and Use of the Melon Dataset\n

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\n Before proceeding with the download and utilization of this dataset,\n it is crucial to review and comply with the following precautions\n carefully\n

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  • \n Kakao Entertainment is the lawful owner of the dataset and\n possesses all the necessary rights. The dataset is intended solely\n for non-profit research purposes and should be utilized in\n accordance with established industry practices. When utilizing or\n referencing the data for research or scholarly papers, it is\n mandatory to include the appropriate attribution as follows:\n \"Kakao Entertainment, melon (www.melon.com).\" Unauthorized\n reproduction or redistribution of the dataset is strictly\n prohibited.\n
    • \n\n
  • \n Please be aware that Kakao Entertainment does not guarantee the\n accuracy, suitability, or validity of the dataset for purposes\n other than those specified. The user assumes full responsibility\n for the usage of the dataset, and Kakao Entertainment shall not be\n held accountable for any consequences or liabilities arising from\n its use. In case of any violation of the precautions regarding the\n download and use of this dataset, or if any damages occur to Kakao\n Entertainment during the process, the user shall be held\n responsible for compensating Kakao Entertainment for such damages.\n
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  • \n By confirming your understanding and agreement to the above\n precautions, you may proceed with downloading and utilizing the\n dataset.\n
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Dataset Description

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Melon Playlist Dataset
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\n This dataset contains 148,826 playlists composed of 649,091 unique\n songs and mel-spectrogram data for each song. The included\n playlists are the listed item in the Melon DJ Playlist service\n provided by Melon. In addition, Melon DJ Playlist consists of\n playlists both made by experts contracting with us in advance for\n quality assurance and filtered by the company’s quality standard\n among those submitted by Melon users who want to put on the Melon\n DJ Playlist. Each playlist contains songs and multiple sets of\n tags (included in the 30,652 unique tags) assigned by the playlist\n creator, along with its title.\n

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Playlist Included
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\n For setting contest questions, we will provide the entire playlist\n data separately as train.json composed of 115,071\n playlists, val.json composed of 23,015 playlists, and\n test.json composed of 10,740 playlists. Unlike\n train.json, test.json and\n train.json have some of the songs and tags in their\n playlists masked for the submission of answers.\n

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Field Description
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  • id: Playlist ID
    • \n
  • plylst_title: Playlist title
    • \n
  • tags: tag list
    • \n
  • songs: song list
    • \n
  • like_cnt: like count
    • \n
  • updt_date: update date
    • \n
\n
\n\n
\n
Mel-Spectrogram Included
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\n Mel-spectrogram data are saved as a ‘{songID}.npy’\n file name with the file extension npy. A number from 0 to 707988\n is assigned as song ID, and each file is allocated to and stored\n in the {floor(ID / 1000)}/ directory. For example,\n the song with ID 415263 is saved as 415/415263.npy. The\n 2.1b.dev677 version of Essentia library was used to extract each\n mel-spectrogram. mel-spectrogram was calculated in the use of\n segments of a song’s 20~50 second-interval to reduce the 16Khz\n sample size rate, 512 frame size, 256 hop size, Hann window\n function, and data size and employed 48 mel-bands resolution so\n that Melon Playlist Dataset can contain about 240GB data.\n

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\n\n
\n
Meta-Data Included
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\n Melon Playlist Dataset provides song_meta.json, the\n song metadata saved in a separate json file format, and\n genre_gn_all.json, the mapping table for genre\n included in the song metadata. song_meta.json has\n metadata for a total of 707,989 songs, including all songs in\n train.json, val.json, and\n test.json. The field description included is as\n follows.\n

\n
Field Description
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    \n
  • _id: song ID
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  • album_id: album ID
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  • artist_id_basket: artist ID list
    • \n
  • artist_name_basket: artist list
    • \n
  • song_name: song title
    • \n
  • song_gn_gnr_basket: song genre list
    • \n
  • song_gn_dtl_gnr_basket: song detailed genre list
    • \n
  • issue_date: issue date
    • \n
\n
\n
\n \n * All information in the metadata may be invalid or subject to\n change due to the copyright holder’s privacy conversion, song\n deletion, metadata modification, and the like.\n \n
\n\n
\n

\n genre_gn_all.json contains a total of 254 genre\n codes, including genre information for 30 major category genre\n codes (included in song_gn_gnr_basket) and 224\n detailed category genre codes (included in\n song_gn_gnr_basket).\n

\n
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\n \n \n \n
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\n \n\n" }, { "path": "docs/arena/melon.html", "content": "\n\n \n \n kakao dataset\n \n \n \n \n \n \n \n\n \n
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멜론 데이터셋

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멜론 데이터셋 다운로드 동의서

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\n 멜론 데이터셋 다운로드 및 이용에 따른 주의사항\n

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\n 본 데이터셋 다운로드 및 이용을 위해서는 반드시 아래 주의사항을\n 확인하여야 합니다.\n

\n
\n
    \n
  • \n 카카오 엔터테인먼트는 데이터셋에 대한 소유자로 정당한 권리를\n 가지고 있습니다. 본 데이터셋은 비영리 연구 목적으로 공증된 관행에\n 합치되는 방법으로만 이용할 수 있습니다. 연구, 논문에 데이터를\n 이용/인용할 경우 'Kakao Entertainment, melon (www.melon.com) ’와\n 같이 반드시 출처를 포함하여 표기하여야 하며 제공되는 데이터셋의\n 무단전재 및 재배포를 금지합니다.\n
    • \n\n
  • \n 카카오 엔터테인먼트는 데이터셋을 다른 목적으로 사용함에 따른\n 정확성, 적합성, 유효성을 보증하지 않습니다. 데이터셋 사용에 따른\n 책임은 전적으로 이용자에게 있으며, 카카오 엔터테인먼트는 그 사용에\n 따른 책임으로 면책됩니다. 본 데이터셋 다운로드 및 이용에 따른\n 주의사항을 위반하거나 데이터셋의 다운로드 및 이용 과정에서 카카오\n 엔터테인먼트에게 손해가 발생할 경우, 카카오 엔터테인먼트에게 해당\n 손해를 배상할 책임이 있습니다.\n
    • \n\n
  • \n 본 주의사항을 읽고 이에 동의를 한 경우에만 데이터셋 다운로드 및\n 이용이 가능합니다.\n
    • \n
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데이터셋 설명

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\n 이 데이터셋에는 649,091개의 고유 곡으로 구성된 148,826개의\n 플레이리스트와 각 곡에 대한 멜 스펙트로그램 데이터가 포함되어\n 있습니다. 포함된 플레이리스트는 멜론에서 제공하는 멜론 DJ\n 플레이리스트 서비스에 등재된 항목입니다. 또한, 멜론 DJ\n 플레이리스트는 당사와 사전 계약을 맺은 전문가가 품질 보증을 위해\n 만든 플레이리스트와 멜론 이용자가 멜론 DJ 플레이리스트에 올리고\n 싶은 플레이리스트 중 당사의 품질 기준에 의해 필터링된\n 플레이리스트로 구성됩니다. 각 재생목록에는 제목과 함께 재생목록\n 제작자가 지정한 노래와 여러 개의 태그(30,652개의 고유 태그에\n 포함)가 포함되어 있습니다.\n

\n
    \n
  • \n song_meta.json: 곡 메타데이터\n
      \n
    • \n 총 707,989개의 곡에 대한 메타데이터가 수록되어 있습니다.\n
      • \n
    • \n 개발 데이터와 평가 데이터에 수록된 모든 곡에 대한\n 메타데이터가 포함되어 있습니다.\n
      • \n
    • \n 필드 설명\n
        \n
      • _id: 곡 ID
        • \n
      • album_id: 앨범 ID
        • \n
      • artist_id_basket: 아티스트 ID 리스트
        • \n
      • artist_name_basket: 아티스트 리스트
        • \n
      • song_name: 곡 제목
        • \n
      • song_gn_gnr_basket: 곡 장르 리스트
        • \n
      • song_gn_dtl_gnr_basket: 곡 세부 장르 리스트
        • \n
      • issue_date: 발매일
        • \n
      \n
      • \n
    • \n 메타데이터의 모든 정보는 저작권자의 비공개 여부 전환, 곡\n 삭제, 메타데이터 수정 등으로 유효하지 않거나 변동될 수\n 있습니다.\n
      • \n
    \n
    • \n
  • \n genre_gn_all.json:\n
      \n
    • \n 곡 메타데이터에 수록된 장르에 대한 정보입니다. 위\n song_meta.json 에서 song_gn_gnr_basket 과\n song_gn_dtl_gnr_basket 에 들어가는 정보들에 대한\n 메타데이터입니다.\n
      • \n
    \n
    • \n
  • \n train.json:\n
      \n
    • \n 모델 학습용 파일로, 115,071개 플레이리스트의 원본 데이터가\n 수록되어 있습니다.\n
      • \n
    • \n 필드 설명\n
        \n
      • id: 플레이리스트 ID
        • \n
      • plylst_title: 플레이리스트 제목
        • \n
      • tags: 태그 리스트
        • \n
      • songs: 곡 리스트
        • \n
      • like_cnt: 좋아요 개수
        • \n
      • updt_date: 수정 날짜
        • \n
      \n
      • \n
    \n
    • \n
  • \n val.json:\n
      \n
    • \n 공개 리더보드용 문제 파일로, 23,015개 플레이리스트에 대한\n 문제가 수록되어 있습니다. 모든 데이터가 수록되어있는 train\n 파일과는 다르게, 곡과 태그의 일부가 수록되어 있습니다.\n
      • \n
    • \n 필드 설명\n
        \n
      • id: 플레이리스트 ID
        • \n
      • plylst_title: 플레이리스트 제목
        • \n
      • tags: 태그 리스트
        • \n
      • songs: 곡 리스트
        • \n
      • like_cnt: 좋아요 개수
        • \n
      • updt_date: 수정 날짜
        • \n
      \n
      • \n
    \n
    • \n
  • \n test.json:\n
      \n
    • \n 파이널 리더보드용 문제 파일로, 10,740개 플레이리스트에 대한\n 문제가 수록되어 있습니다. 모든 데이터가 수록되어있는 train\n 파일과는 다르게, 곡과 태그의 일부가 수록되어 있습니다.\n
      • \n
    • \n 필드 설명\n
        \n
      • id: 플레이리스트 ID
        • \n
      • plylst_title: 플레이리스트 제목
        • \n
      • tags: 태그 리스트
        • \n
      • songs: 곡 리스트
        • \n
      • like_cnt: 좋아요 개수
        • \n
      • updt_date: 수정 날짜
        • \n
      \n
      • \n
    \n
    • \n\n
  • \n arena_mel_{0~39}.tar\n
      \n
    • \n 곡에 대한 mel-spectrogram 데이터를 담고있는 파일입니다. 위에\n 있는 파일들에서 등장하는 각 곡 ID마다 npy 파일 1개가\n 배정되어있습니다. numpy로 다음과 같이 로드할 수 있습니다.\n 
      import numpy as np\n\nmel = np.load(\"0.npy\")
      \n
      • \n
    • \n 곡 ID는 0~707988 까지 배정되어 있으며,\n 곡ID.npy 의 파일 이름을 가지고 있습니다. 파일의\n 갯수가 많기 때문에, 각 npy 파일은 각각\n {floor(ID / 1000)}/ 폴더 아래에 들어가있습니다.\n 예를 들어 곡 ID가 415263인 파일의 경우\n 415/415263.npy 로, 곡 ID가 53712인 경우\n 53/53712.npy 에 존재합니다.\n
      • \n
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    • \n
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\n
\n \n\n" }, { "path": "onboarding/README.md", "content": "# 추천팀 온보딩\n\n카카오 추천팀에 입사하기 전에 미리 보시면 좋을 내용들을 정리해놓은 문서입니다.\n\n## 추천 기술 관련 자료\n\n해당 내용에 링크된 자료는 방대하므로(특히 수학/ML 기초) 필요한 부분들 위주로 보시기 바랍니다.\n\n### 수학/ML 기초\n\n추천 시스템은 머신러닝의 응용 분야로서 머신러닝에 대한 기초지식을 탄탄히 다지는 것은 큰 도움이 됩니다. 기본적인 Linear Algebra, Statistical Inference, Convex Optimization에 대해 익숙하지 않다면 이에 대한 학습이 필요할 수 있습니다.\n\n대표적인 ML 교재 최소 1개 이상을 정독해본 경험을 가지는 것을 추천해 드립니다.\n\n- [Introduction to Statistical Learning (ISLR)](https://www.statlearning.com/)\n- [Elements of Statistical Learning (ESL)](https://hastie.su.domains/Papers/ESLII.pdf)\n- [Machine Learning: A Probabilistic Perspective (Murphey 책)](https://probml.github.io/pml-book/)\n- [Pattern Recognition an Machine Learning (Bishop 책)](https://www.microsoft.com/en-us/research/uploads/prod/2006/01/Bishop-Pattern-Recognition-and-Machine-Learning-2006.pdf)\n- ... etc.\n\n딥러닝 교재, 최신 추천시스템은 뉴럴넷을 활용하는 경우도 많고 자연어, 이미지 등의 데이터를 활용하는 경우도 있습니다.\n\n- [Deep Learning Book](https://www.deeplearningbook.org/)\n- ... etc.\n\n### 추천 알고리즘\n\n대표적인 올드 스쿨 알고리즘입니다. 해당 알고리즘들은 논문이 발표된지 오래되었지만, 아직도 대중적으로 많이 활용되고 있습니다.\n\n- iALS ([Collaborative Filtering for Implicit Feedback Datasets](http://yifanhu.net/PUB/cf.pdf))\n- BPR ([BPR: Bayesian Personalized Ranking from Implicit Feedback](https://arxiv.org/pdf/1205.2618.pdf))\n- LinUCB ([A Contextual-Bandit Approach to Personalized News Article Recommendation](https://arxiv.org/pdf/1003.0146.pdf))\n\n그 외, 벤치마크로 자주 등장하는 전통 알고리즘은 다음과 같습니다.\n\n- WARP ([Improving Pairwise Learning for Item Recommendation from Implicit Feedback](http://webia.lip6.fr/~gallinar/gallinari/uploads/Teaching/WSDM2014-rendle.pdf))\n- SLIM ([SLIM: Sparse Linear Methods for Top-N Recommender Systems](https://ieeexplore.ieee.org/abstract/document/6137254))\n\n카카오 테크 블로그에 카카오 추천시스템에 대하여 주제별로 설명한 글들입니다.\n\n- [테크 블로그: 추천 시스템](/README.md/#%EC%B6%94%EC%B2%9C-%EC%8B%9C%EC%8A%A4%ED%85%9C)\n\n추천 관련 최신 논문들을 서칭해보고 abstract와 related works를 읽어보면 최신 연구 방향과 그 기반이 되는 주요 논문들을 알 수 있습니다\n\n- 추천 관련 대표 학회들: RecSys, WWW, SIGIR, KDD, WSDM, CIKM, AAAI, IJCAI, ICML, NeurIPS, ... etc.\n\n(좋은 논문인지와 별개로) 대표적으로 유명한 추천 알고리즘 논문들은 아래와 같습니다.\n\n- [BERT4Rec: Sequential Recommendation with Bidirectional Encoder Representations from Transformer, CIKM'19](https://arxiv.org/abs/1904.06690)\n- [Variational Autoencoders for Collaborative Filtering, WWW'18](https://dl.acm.org/doi/10.1145/3178876.3186150)\n- [Neural Collaborative Filtering, WWW'17](https://dl.acm.org/doi/10.1145/3038912.3052569)\n- [Recommending What Video to Watch Next: A Multitask Ranking System, RecSys'19](https://daiwk.github.io/assets/youtube-multitask.pdf)\n- [Collaborative Metric Learning, WWW'17](https://vision.cornell.edu/se3/wp-content/uploads/2017/03/WWW-fp0554-hsiehA.pdf)\n- [Convolutional Matrix Factorization for Document Context-Aware Recommendation, RecSys'16](http://uclab.khu.ac.kr/resources/publication/C_351.pdf)\n- ... etc.\n\n### 그 외\n\n#### 강화학습\n\n실시간 추천시스템은 사용자와 상호작용하며 사용자들의 취향을 파악하고 추천해주는 시스템으로서 강화학습 framework이 잘 어울린다는 평가가 많습니다, 특히 Multi-Armed Bandit, Contextual-Bandit 등은 팀 내에서도 매우 많이 사용되고 있습니다\n\n- [강화학습 대표 교재 (Reinforcement Learning: An Introduction)](http://incompleteideas.net/book/the-book.html)\n- [David Silver 강의](https://www.davidsilver.uk/teaching/)\n\n## 머신러닝플랫폼 관련 자료\n\n아래의 키워드는 모두 머신러닝플랫폼에서 중요한 것들이지만 업무에 필수는 아닙니다.\n학습 비용이 만만치 않기 때문에 천천히 기반 다지는 것을 추천합니다.\n\n### 방법론, 가이드\n\n- [Domain Driven Design (DDD)](https://martinfowler.com/bliki/DomainDrivenDesign.html)\n- [Microservices (MSA)](https://learn.microsoft.com/en-us/azure/architecture/guide/architecture-styles/microservices)\n- [Event Driven Architecture (EDA)](https://learn.microsoft.com/en-us/azure/architecture/guide/architecture-styles/event-driven)\n- [Cloud Native](https://learn.microsoft.com/en-us/dotnet/architecture/cloud-native/definition)\n- [CI/CD](https://en.wikipedia.org/wiki/CI/CD)\n- [Test Driven Development (TDD)](https://martinfowler.com/bliki/TestDrivenDevelopment.html)\n\n### 개발 자원\n\n머신러닝플랫폼은 대부분 파이썬 3.10을 사용하고 있습니다.\n아래는 개발할 때 많이 사용하는 라이브러리를 간추렸습니다.\n\n- [poetry](https://python-poetry.org/)\n- [pydantic](https://pydantic-docs.helpmanual.io/)\n- [pytest](https://pytest.org)\n- [mypy](https://mypy.readthedocs.io/)\n\n## 팀 개발환경 및 플랫폼\n\n### 기본 개발환경\n\n팀의 메인 개발언어는 Python, C++입니다.\n\n코드 Editor로는 주로 Vim을 사용하고 있으나, 제약은 없으며 VSCode, PyCharm등 개발자 본인에게 가장 편한 editor를 사용할 수 있습니다. (단, 서버 내에서 작업하는 경우도 많기에, Vim에 대한 기본적인 사용법을 익혀두시면 유용합니다.)\n\n- [Vim](https://www.vim.org/)\n - [Vim adventures](https://vim-adventures.com/): Vim을 간단한 게임형태로 배워볼 수 있는 페이지입니다.\n\n코드의 버전관리는 Git / GitHub를 사용하고 있습니다.\n\n- [git](https://git-scm.com/)\n - [Git/GitHub 안내서](https://subicura.com/git/guide/)\n\n팀 내 대부분의 서비스는 docker 및 kubernetes를 기반으로 동작합니다.\n\n- [docker](https://www.docker.com/)\n - [초보를 위한 도커 안내서](https://subicura.com/2017/01/19/docker-guide-for-beginners-1.html)\n- [kubernetes](https://kubernetes.io/)\n - [쿠버네티스 안내서](https://subicura.com/k8s/guide/#%E1%84%80%E1%85%A1%E1%84%8B%E1%85%B5%E1%84%83%E1%85%B3)\n\n### 플랫폼\n\n#### Kafka\n\n추천 시스템에서는 각 유저가 어떤 아이템을 소비했는지, 또 소비한 아이템에 대해 어떠한 반응을 보였는지에 대한 정보가 중요하게 사용됩니다. 이러한 정보는 서비스단에서 실시간으로 수집되어 [Kafka](https://kafka.apache.org/)를 통해 추천팀에서 받아볼 수 있는 형태로 전달되고 있습니다. 따라서 Kafka의 기본구조 및 동작 방식에 대해 미리 알아두시면 팀에서 실제 업무를 하실 때 많은 도움이 됩니다.\n\n- [Youtube강의-아파치 카프카](https://www.youtube.com/playlist?list=PL3Re5Ri5rZmkY46j6WcJXQYRlDRZSUQ1j)\n\n#### MongoDB\n\n[MongoDB](https://www.mongodb.com/)는 팀에서 가장 많이 사용하는 key-value storage 중 하나이며, 주 사용처는 다음과 같습니다.\n\n- 개별 유저에 대한 추천 결과 저장(캐시 용도)\n- Feature storage\n- 유저들의 아이템 소비 로그, 피드백 로그 저장\n\nMongoDB 참고 자료 (팀 내에서 직접 관리를 하는 것은 아니기에 깊이 보실 필요는 없습니다. 아래에서는 3, 4, 5를 위주로 보셔도 괜찮습니다.)\n\n- [1편: 소개, 설치 및 데이터 모델링](https://velopert.com/436)\n- [2편: Database/Collection/Document 생성, 제거](https://velopert.com/457)\n- [3편: Document Query(조회) - find() 메소드](https://velopert.com/479)\n- [4편: find() 메소드 활용 - sort(), limit(), skip()](https://velopert.com/516)\n- [5편: Document 수정 - update() 메소드](https://velopert.com/545)\n- [pymongo docs](https://pymongo.readthedocs.io/en/stable/)\n - pymongo는 MongoDB의 python client로써, 팀에서 MongoDB를 다룰 때 주로 사용하고 있습니다.\n\n#### Hadoop\n\n[Hadoop](https://hadoop.apache.org/)을 구성하는 여러 가지 요소가 있지만, 팀에서는 주로 HDFS, Hive(Presto, Spark)를 많이 사용합니다. Hadoop의 개별 요소를 세세히 설명하기엔 양이 너무 방대하기에, 간단한 개념 위주로 링크를 정리했습니다.\n\n- HDFS: 유저 x 아이템 interaction 데이터 저장, 학습된 추천 모델 저장 등\n - [hdfs 기본개념](https://kadensungbincho.tistory.com/30)\n - [hdfs 명령어 모음](https://blog.voidmainvoid.net/175)\n- Hive(Presto, Spark): 데이터 분석, 전처리 등에 사용\n - [Hive, Presto, Spark 기본 설명](https://seoyoungh.github.io/data-science/distribute-system-1/)\n" }, { "path": "paper_review/README.md", "content": "

\n
\n 📝 카카오 추천팀 지식 저장소\n

\n\n카카오 추천팀에서 추천 관련 학회의 논문들을 읽고 정리하는 저장소입니다. 정리는 크게 4가지 방식으로 구성되어 있습니다.\n\n- Summary : 3줄 내외로 논문 내용을 요약합니다.\n- Approach : 논문에서 쓰인 접근법들을 정리합니다.\n- Results : 실험 결과에 대한 내용을 정리합니다.\n- Conclusion : 논문에 대한 본인의 생각을 정리합니다.\n\n발표 자료를 학회별, 주제별로 정리한 링크는 다음과 같습니다.\n\n### Conferences\n\n- [RecSys2021](recsys/recsys2021/RecSys2021.md)\n\n### Topics\n\n- [Algorithmic Advances](topics/Algorithmic%20Advances.md)\n- [Applications-Driven Advances](topics/Applications-Driven%20Advances.md)\n- [Bandits and Reinforcement Learning](topics/Bandits%20and%20Reinforcement%20Learning.md)\n- [Echo Chambers and Filter Bubbles](topics/Echo%20Chambers%20and%20Filter%20Bubbles.md)\n- [Interactive Recommendation](topics/Interactive%20Recommendation.md)\n- [Language and Knowledge](topics/Language%20and%20Knowledge.md)\n- [Metrics and Evaluation](topics/Metrics%20and%20Evaluation.md)\n- [Practical Issues](topics/Practical%20Issues.md)\n- [Privacy, Fairness, Bias](topics/Privacy,%20Fairness,%20Bias.md)\n- [Real-World Concerns](topics/Real-World%20Concerns.md)\n- [Scalable Performance](topics/Scalable%20Performance.md)\n- [Theory and Practice](topics/Theory%20and%20Practice.md)\n- [Users in Focus](topics/Users%20in%20Focus.md)\n" }, { "path": "paper_review/recsys/recsys2021/\"Serving Each User\"- Supporting Different Eating Goals Through a Multi-List Recommender Interface.md", "content": "# \"Serving Each User\"- Supporting Different Eating Goals Through a Multi-List Recommender Interface\n\n- Paper : \n- Authors : Alain Starke, Edis Asotic, Christoph Trattner\n- Reviewer : bell.park, marv.20\n- Topics\n - [#Users_in_Focus](../../topics/Users%20in%20Focus.md)\n - #Diversity\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 음식 추천 시스템에서, 유저의 다양한 목적을 만족시키기 위해 어떻게 노출시키면 좋을지(인터페이스)에 대해서 연구한 논문입니다.\n- 추천 결과를 single-list와 multi-list 각각의 방법으로 노출했을 때 어떠한 차이가 있는지 유저 스터디로 비교 분석하였습니다.\n- 리스트 간의 순서를 정하는 모델이나 로직이 없다는 것은 아쉽지만, 현실적인 접근이라고 생각됩니다.\n\n## Approach\n\n- 기본적으로 현재 보고있는 레시피와 유사한 레시피를 추천하는 연관 추천 환경입니다.\n- 저자들이 직접 레시피 데이터를 긁어와서 5가지 추천 리스트를 구성하였습니다.\n - Similar recipies - 레시피 이름 TF-IDF indexing후 top-5 similarity\n - Fewer Calories - top-40 similarity 후 칼로리 작은 순서대로 top-5\n - Fewer Carbohydrates - top-40 similarity 후 탄수화물 작은 순서대로 top-5\n - Less Fat - top-40 similarity 후 지방 작은 순서대로 top-5\n - More Fiber - top-40 similarity 후 섬유질 큰 순서대로 top-5\n- 366명의 실험 참가자를 모집해서 실험을 진행하였습니다.\n - 실험 참가자 마다 5번의 실험을 진행\n - 참가자가 레시피를 검색해서 들어가면 아래 2가지 중 하나의 화면이 노출\n - 미리 준비된 5개의 리스트 중 하나를 골라 노출\n - 5개의 리스트를 전부 노출\n - 설명은 붙이는 경우도 있고 안붙이는 경우(Similar recipies)도 있음\n - 참가자는 레시피를 하나 고르고 레시피와 추천에 대해 만족도를 리포트\n\n## Results\n\n- 참가자의 피드백을 Structural Equation Modeling (SEM) 기법으로 분석하였습니다.\n- 주목할 만한 결론은 다음과 같습니다.\n - Multi-list로 노출하면 설명 여부와 상관 없이 참가자들이 더 다양하게 추천된다고 느낍니다. (higher **perceived** diversity)\n - 실제로 다양하게 노출하는 것과는 다르고, 참가자들이 그렇게 느꼈다는 부분이 중요하다고 합니다.\n - 참가자들이 다양하게 추천된다고 느끼면, 아래 두 가지 현상이 나타납니다.\n - 하나의 아이템을 고르는데는 어려움을 느낍니다. (higher level of diversity, higher level of choice difficulty)\n - 추천의 만족도가 증가합니다. (perceived diversity was also positively related to choice satisfaction)\n - 참가자들이 추천이 나온 이유를 이해하면, 추천이 더 다양하다고 느낍니다.\n - Single-list 노출 시에는 추천에 대한 설명을 붙여주었을 때 참가자 만족도가 올라가지만, Multi-list 노출 시에는 설명이 있을 때 만족도가 소폭 하락하였습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Accordion- a Trainable Simulator for Long-Term Interactive Systems.md", "content": "# Accordion- a Trainable Simulator for Long-Term Interactive Systems\n\n- Paper : \n- Authors : James McInerney, Ehtsham Elahi, Justin Basilico, Yves Raimond, Tony Jebara\n- Reviewer : hee.yoon\n- Topics\n - [#Metrics_and_Evaluation](../../topics/Metrics%20and%20Evaluation.md)\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 유저와 인터렉션이 있는 시스템 기반의 트레인 가능한 시뮬레이터를 개발하였습니다.\n - 구성은 다음과 같습니다.\n - 유저가 visit 할지 여부를 결정하는 visit model\n - 유저에게 해당 시점에 어떤 아이템이 추천될지 결정하는 recommedation imitator\n - 유저가 추천된 아이템을 클릭할지 결정하는 user selection model\n - 컨트리뷰션\n - 이 중에서 visit model 를 inhomogeneous Poisson process 로 구현한 부분이 중요한 컨트리뷰션이라고 볼 수 있습니다.\n - (비교 시뮬레이터가 Norm IPS인데) 왜 Norm IPS 에 비해, sim2real gap 을 더 줄일 수 있는가?\n - 추천 퀄리티에 따라 impression수 자체가 차이가 날 수 있는 부분을 시뮬레이션에 녹여 모델링함\n - code: \n\n## Approach\n\n- Simulator Data Generation Algorithm:\n \n- 구조도\n\n\n- Visit Model\n - Global Intensity + State-based intensity + Recent Activity intensity using Hawkes\n - user_state, time 이 주어졌을 때 유저의 intensity를 리턴\n- Recommender Imitator (= Impression Model?)\n - user_state 가 주어졌을 때, item 을 리턴\n - 컨트롤 폴리시 목적으로는 imitator 를 학습하여 사용할 수도 있고,\n - 타겟 폴리시 목적으로는 실험하고자 하는 모델로 대체하여 사용할 수 있는 것으로 추정. (Non negative Matrix Factorization 으로 Hyperparameter Fitting 시뮬레이션 Section 4.2 참고)\n- User Selection Model\n - user_state, item 이 주어졌을때 reward 를 리턴\n\n### Visit Model\n\n- \n- \n- Inhomogeneous Poisson Process:\n \n- Hawkes Intensity:\n - 과거 추천 아이템에 유저가 긍정적으로 반응했을 경우 더 커짐\n - \n\n### Marking Distribution = Recommendation Imitator (Impression Model) * User Selection Model\n\n\n- Both the impression model and user selection model use as\n - input: a bag of words representation of previous user interactions with items\n - and map these though a dense network\n - output: to a multinomial distribution over items.\n\n## Results\n\nAB 테스트 결과를 얼마나 재현 가능한가? 를 평가하였습니다.\n\n" }, { "path": "paper_review/recsys/recsys2021/Burst-induced Multi-Armed Bandit for Learning Recommendation.md", "content": "# Burst-induced Multi-Armed Bandit for Learning Recommendation\n\n- Paper : \n- Authors : Rodrigo Alves, Antoine Ledent, Marius Kloft\n- Reviewer : charlie.cs\n- Topics\n - [#Algorithmic_Advances](../../topics/Algorithmic%20Advances.md)\n - [#Bandits_and_Reinforcement_Learning](../../topics/Bandits%20and%20Reinforcement%20Learning.md)\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- non-stationary & context-free MAB 상황에서 Cold-start recommendation (CSR) 을 위한 방법인 BMAB (Burst-induced MAB)을 제시하였습니다.\n- 기존 non-stationary MAB(EXP3, Discounted-UCB etc.)의 방식과 비교되는 특징은 다음과 같습니다.\n 1. context-free: feature vector가 필요하지 않습니다.\n 2. reward 분포의 변화를 확인하는 대신, 시스템의 temporal dynamics를 활용합니다.\n\n## Approach\n\n### Intuition\n\n- 추천 환경에는 크게 두가지 상태가 있다고 가정: loyal (stable) state 그리고 curious (unstable) state\n- 전체 time horizon은 일정 구간으로 나뉘어져서, 두 state 중 하나가 발생한다고 가정함\n- loyal state는 구간에 상관없이, curious state는 구간마다 stationary payoff distribution를 가진다고 주장\n \n- state 마다 MAB 모델을 세우고, 특정 state 상황에 해당하는 모델을 이용하여 추천을 진행\n\n### Burst-induced MAB (BMAB)\n\n- Algorithm\n 1. 두 state (loyal, curious)마다 각각 K개의 beta parameter를 두고, orcale이 timestamp마다 어떤 state인지 알려줌\n 2. state를 확인하면, 해당 state의 beta parameter를 통해 일반적인 Thompson Sampling 추천을 진행\n 3. 만약 curious (s = 1) 에서 loyal (s = 0) 상태로 넘어가는 경우, curious state에 해당하는 beta parameter를 decay\n \n\n### State Detector\n\n- 매 timestamp 마다 어떤 state인지 파악하는 orcale을 구성하기 위해서는 homoheneous Poisson process에 대한 intensity (`lambda_L`)가 알려져 있다는 가정이 요구됨\n - intensity (function)는 쉽게 말하면 특정 구간에서 발생한 이벤트의 rate\n - 이 가정의 존재 이유는 문제 초기 정의 시, time series 가 두가지 stochastic point process의 mixture에 의해 생성된다는 가정이 있었기 때문\n - loyal: a homogeneous Possion process (HPP) with intensity `lambda_L`\n - curious: a piece-wise homogeneous Poisson process (PW-HPP) with intensity `lambda_C(t)`\n - 해당 intensity를 몰라도 쉽게 유추할 수 있다고 주장\n - 예시 (HPP with `lambda_L=3`, PW-HPP with `lambda_C in (0.15, 15)`)\n ![image-20211123140547188](https://tva1.sinaimg.cn/large/008i3skNgy1gwp03l9ztij32wq0rawlv.jpg)\n- Algorithm\n - state를 추정할 timestep 구간을 사이즈가 `Delta` 인 window로 나누고, 해당 구간이 intensity 가 `lambda_L` 인 Possion process에서 생성되었는지 검증\n - 즉, window 내 분포는 shape가 `Delta-1` 이고 scale이 `lambda_L` 인 Gamma distribution을 따르는지 확인\n - 해당 분포를 따른다면 loyal (`0`) 그렇지 않다면 curious (`1`)\n \"image-20211115224032770\"\n - `q` 는 Gamma 분포의 quantile function\n - quantile function의 shape값이 `lambda-1` 인 이유는 `t_{i-\\Delta+1}` 부터 event counting이 진행되기 때문\n - hypothesis testing의 목적은 burst period를 확인하기 위한 목적 (calm period는 loyal 에게 dominated)\n - 만약 `delta=0.95`라면 test는 다음과 같이 해석될 수 있음 \n : scale이 `lambda_L`인 event가 `Delta-1`번 발생할때까지 걸리는 time interval 분포 중, interval `Delta_i`가 분포의 quntaile 5% 내에 존재하는가?\n - 쉽게 말하면, 기존에 이벤트가 `N` 번 발생하는데 `X` 만큼 걸렸는데, `Y`는 그보다 더 짧은가?\n- 해당 intensity를 몰라도 쉽게 유추할 수 있다고 주장\n - solve with EM - Burstiness scale: A parsimonious model for characterizing random series of events. In Proceedings of the 22nd ACM SIGKDD\n\n## Results\n\n- 합성 데이터, 실제 데이터 모두를 사용해서 제안한 방법을 평가하였습니다.\n - 제안한 방법들: BMAB-O (oracle), BMAB-R (detector)\n - 실제 데이터의 경우, 전체 timeseries에서 일정 구간은 `lambda_L` 을 추정하는 구간으로 사용하고 나머지는 평가에 사용하였습니다.\n- metric: average of the observed reward (`R(T)/N`), and its standard deviation\n - the user liked (Behance, MovieLens), searched (Google trends) or clicked on (Outbrain)\n- baseline은 크게 세가지로 나뉩니다.\n - stationary: TS\n - non-stationary: EXP3\n - piece-wise stationary: EXP3DD, DUCB, MUCB, WMD\n\n\"image-20211115222133822\"\n\n- `K` : the number of arms, `N`: the number of events, `T`: the observed time\n- 제안한 BMAB-R이 모든 dataset에서 reward가 우세하였습니다.\n- MovieLens의 경우 제안한 방법이 TS과 거의 차이가 없었는데 이는 가장 인기있는 다섯개의 아이템이 stationary 하기 때문이라고 주장하였습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Cold Start Similar Artists Ranking with Gravity-Inspired Graph Autoencoders.md", "content": "# Cold Start Similar Artists Ranking with Gravity-Inspired Graph Autoencoders\n\n- Paper : \n- Authors : Guillaume Salha-Galvan, Romain Hennequin, Benjamin Chapus, Viet-Anh Tran, Michalis Vazirgiannis\n- Reviewer : tony.yoo\n- Topics\n - [#Real-World_Concerns](../../topics/Real-World%20Concerns.md)\n - #Cold_Start\n - #Graph\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Directed graph로 정의된 item network에 대해 link prediction task을 수행한 논문입니다.\n- Directed 기반의 similarity를 구하기 위해 gravity 기반의 매커니즘을 도입하여 단 방향 선호도를 예측 가능하게 만들었습니다.\n- Cold item (노드 피쳐는 있으나 adjacent 정보가 isolated 된 상황)에 대해 masking과 VAE기반의 구조로 접근하여 성능 향상을 내었습니다.\n\n## Approach\n\n### Gravity-Inspired similiarity\n\n![gravity-inspired-vae-overview](https://user-images.githubusercontent.com/38134957/165449090-f409022d-2da1-440d-87ab-b89a821e17ee.png)\n\n$$\n\\begin{aligned}\n\n\\hat{A}_{ij} &= \\sigma \\left( \\log \\frac{Gm_j}{\\Vert z_i - z_j \\Vert_2^2} \\right)\\\\\n\n&= \\sigma \\left( \\underbrace{\\log Gm_j}_{\\text{denoted}~\\tilde{m}_j} - \\log\\Vert z_i - z_j \\Vert_2^2 \\right)\n\n\\end{aligned}\n$$\n\n즉, VAE기반의 GNN를 태워 얻은 $\\tilde{Z} = [Z; \\tilde{M}], Z\\in \\mathbb{R}^{n \\times d}, \\tilde{M}\\in \\mathbb{R}^{n }$ 로 similiarity score $\\hat{A}_{ij}$를 예측합니다.\n\n### Loss\n\n- VAE 기반의 encoding 모델로 GNN을 사용하였습니다.\n$$\nq(\\tilde{Z} \\vert A, X) = \\Pi_{i=1}^n q(\\tilde{z}_i\\vert A, X)\n$$\n\n$$\nq(\\tilde{z}_i \\vert A, X) = \\mathcal{N}\\left( \\tilde{z}_i \\vert \\mu_i, \\text{diag}(\\sigma_{i}^2)\\right)\n$$\n\n$$\n\\begin{cases}\n\\mu = GNN_{\\mu}(A, X) \\\\\n\\sigma = GNN_{\\sigma}(A, X)\n\\end{cases}\n$$\n\n- $P(A)$ 를 최대화하려면 다음의 ELBO를 최대화 하면 됩니다. (jensen's inequality로 증명 가능).\n$$\n\\mathcal{L} = \\underbrace{E_{q(Z |A,X)} \\left[ \\log p(A|Z) \\right]}_{\\text{Reconstruction Loss}} − \\underbrace{D_{KL}(q(Z|A,X) \\Vert p(Z))}_{\\text{Regularization Loss}},\n$$\n\n- Reconstruction Loss\n - $q$ 에 대한 평균을 구하기 어렵기 때문에 $A$ 가 bernoulli distribution을 따른다는 가정 하에 몬테카를로 근사를 이용해서 cross entropy 를 계산합니다.\n$$\n\\mathcal{L}_{Reconstruction} = BCE(A, \\hat{A})\n$$\n\n- Regularization Loss\n - 둘 사이의 KL divergence를 구해야하는데 $p(z)$ 를 normal distribution이라 가정하면 다음과 같이 계산됩니다.\n$$\n\\mathcal{L}_{Regularization} = \\frac{1}{2} \\sum_d\\sum_i^k exp(\\sigma_{ii, b}^2) + \\mu_{i, b} - \\sigma_{ii, b} - 1\n$$\n\n### Cold Start Similiar Items Ranking\n\nwarm item 수를 $n$, cold item 의 갯수를 $m$ 이라 하면, adjacent matrix $A \\in \\mathbb{R}^{(n + m) \\times (n +m)}$ 에서 cold item의 row는 zero vector로 masking 됩니다.\n\n$A$ 를 GNN 기반의 VAE 모델을 통해 다음과 같이 예측할 수 있습니다. 여기서 $\\lambda$ 는 influence 와 proxmity사이의 trade off를 튜닝하는 데 사용되며 이는 popularity bias를 control하는 걸 의미합니다. 이렇게 예측된 similairity로 부터 top $k$ 개를 추천하게 됩니다.\n\n$$\n\\hat{A}_{ij} = \\sigma \\left( \\underbrace{\\tilde{m}_j}_{\\text{influence of j}} -\\lambda \\underbrace{\\log \\Vert z_i - z_j\\Vert_2^2}_{\\text{proximity of i and j}} \\right)\n$$\n\n### Other Methods\n\n- [VGAE](https://arxiv.org/abs/1611.07308):\n - Undirected graph 에 대해 $\\hat{A} = \\sigma \\left(z_i^{T}z_j\\right)$ 를 통해 예측합니다. 다만, 이렇게 계산하면 symmetric 하다는 단점이 존재합니다.\n- Sour-Targ GVAE:\n - Directed graph 에 대해 $\\hat{A} = \\sigma\\left( z_i^{(s)T}z_j^{(t)}\\right)$, $z^{(s)} = z[:d/2]$, $z^{(t)}=z[d/2:]$. 단, $d$는 짝수이고, 이렇게 계산하면 non-symmetric이 됩니다.\n\n## Results\n\n### Dataset\n\n- [Deezer](https://www.deezer.com/soon) 의 24,270 수의 artist 들로 구성 된 directed graph입니다.\n- Node feature는 56 dimension을 가지며 다음 component들로 구성되어 있습니다.\n - Genre vector (32-dim)\n - Country vector (20-dim)\n - Mood vector (4-dim)\n- Train, valid, test 는 8:1:1 로 split. Valid와 test의 경우엔 cold 노드들로 구성되어 있기 때문에 neigbor edge는 masking 되어있습니다.\n\n### Metric\n\n- Recall, MAP, NDCG를 사용하였습니다.\n\n### Performance\n\n![exp](https://user-images.githubusercontent.com/38134957/165449118-bc1e4374-4dfa-4f80-a779-c4a7175abe7f.png)\n\n- Gravity 매커니즘이 큰 폭으로 outperform하였습니다.\n- Source.-Targ. 버전이 최근 연구에 대해 약간 우위를 보입니다. Non-symmetric 성질을 띈다는 점에 주목할 수 있습니다. Symmetric인 GAE, GVAE는 더 낮은 걸 보았을때 Non-symmetric 방법이 우수함을 의미합니다.\n- Source.-Targ. 에서 VAE 가 AE보다 좋은 결과를 보였지만, Gravity 버전에서는 반대의 결과를 보였습니다. 상황에 따라 VAE vs AE의 성능이 달라지게 됩니다.\n\n#### Mass parameter\n\n- 정성적 분석: 왼쪽은 artist별 mass의 크기와 링크 사이를 visualization 한 결과입니다. 빨간색 노드들이 레게 아티스트들 이고, mass가 큰 것 중에 하나를 예로 들은게 레게의 유명한 아티스트 Bob Marley입니다.\n- 정량적 분석: 오른쪽은 mass (아티스트들) 사이의 여러 measure (popularity, in-degree, page rank) 로 상관관계 분석을 해보았습니다. 결과를 보았을 때, mass가 높다고 measure 값들이 꼭 높은 것은 아니지만 어느정도 상관관계가 있다는것을 보여주었습니다.\n\n
\n\n
\n\n#### Impact of attributes\n\n- Node feature를 많이 쓸수록 성능이 향상되었습니다.\n\n\n#### Popularity-diversity trade off\n\n- $\\lambda$ 를 높힐 수록 popular한 item의 rank 빈도가 많아지고, 줄이면 distance에 의한 계산만 하기 때문에 줄어들게 됩니다.\n\n\n## Conclusion\n\n- 그래프 방법론을 이용하여 similar item 추천을 non-symetric한 상황에서 다루어 성능을 향상시킨 논문입니다.\n- Cold-start 상황에서 masking, VAE 방법론등의 이점을 적용하였습니다.\n\n### Critical view of points\n\n- Cold 아이템의 경우 adjacent 정보를 masking (0으로 패딩)하면 모두 동일한 피쳐로 간주되게 됩니다.\n- Cold start 상황에 대해서만 평가를 진행해보았을 때의 우위 비교가 없어 아쉬웠습니다.\n- 실험에 사용된 benchmark 모델들은 비교적 최근 논문이 적어서(STAR-GCN, DEAL 빼곤 옛날 논문이라) 아쉬웠습니다.\n\n| Model 이름 | 학회 년도 | 인용수 |\n| ------------------------------------------------------------ | ---------- | ------ |\n| [DropoutNet](https://www.cs.toronto.edu/~mvolkovs/nips2017_deepcf.pdf) | NIPS 2017 | 104 |\n| [Graph VAE](https://arxiv.org/abs/1609.02907) | ICLR 2017 | 1,267 |\n| [STAR-GCN](https://arxiv.org/abs/1905.13129) | IJCAI 2019 | 72 |\n| [DEAL](https://arxiv.org/abs/2007.08053) | IJCAI 2020 | 11 |\n" }, { "path": "paper_review/recsys/recsys2021/Debiased Explainable Pairwise Ranking from Implicit Feedback.md", "content": "# Debiased Explainable Pairwise Ranking from Implicit Feedback\n\n- Paper : \n- Authors : Khalil Damak, Sami Khenissi, Olfa Nasraoui\n- Reviewer : hee.yoon\n- Topics\n - [#Privacy_Fairness_Bias](../../topics/Privacy,%20Fairness,%20Bias.md)\n - #Matrix_Factorization\n - #Explainable_Recommendation\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 기존 Bayesian Personalized Ranking(BPR) 대비하여 explainability를 늘리고 exposure bias를 잡은 논문입니다.\n - 기존 BPR 모델은 설명 불가능한 블랙박스 모델이었습니다. -> a novel explainable loss function and a corresponding Matrix Factorization-based model called Explainable Bayesian Personalized Ranking (EBPR) that generates recommendations along with item-based explanations.\n - 기존 BPR 모델은 Missing Not At Random (MNAR) 데이터 특성 때문에 exposure bias에 취약했었습니다. -> an unbiased estimator for the ideal EBPR loss.\n\n## Approach\n\n### BPR\n\n- objective function:\n \n\n### Explainable BPR\n\n- objective function:\n \n- E_ui+ (1 - E_ui-) 부분은 (u, i+, i-) 인스턴스의 컨트리뷰션의 비중을 정하는 역할을 합니다. Positive 아이템의 설명력이 높을수록, negative 아이템의 설명력이 낮을수록 학습 기여도가 높습니다. 결과적으로 생성된 추천결과의 상위 아이템들은 더 높은 설명력을 가질 것이라고 기대할 수 있습니다.\n- For instance, in the extreme case where either the positive item is not explainable at all or the negative item is completely explainable, the update equation is zeroed out. Hence, no contribution will come from the corresponding instance to the learning. This is reasonable and desirable since the aforementioned case depicts a non explainable preference, where either the positive item is not explainable or the negative item is explainable. Either case undermines the explainability of the preference. (설명가능하지 않은 아이템을 소비한 것은 학습에 포함이 안됩니다. 아래 E_ui 정의를 참고하면, 유저가 소비한 아이템의 이웃 아이템을 유저가 소비한 이력이 없으면 학습에 포함이 안됩니다.)\n\n- explainability matrix:\n - E_ui = items the user interacted from the neighboring items / len(neighboring items)\n - 이웃한 아이템 중에서 해당 유저와의 인터랙션이 발생한 아이템의 비중입니다.\n - similarity의 계산: 별도의 데이터가 아닌, rating 메트릭스 기반으로 cosine similarity를 계산합니다.\n - for a specific item, the more neighboring items a given user has interacted with, the higher the explainability of that item will be to this user.\n - 학습 시작 전, 미리 계산하는 방식입니다.\n - \n - \n - neighborhood size\n - \n\n- 추천 결과 서빙시 explainability 기반으로 해석된 결과를 제공 가능합니다. (참조 논문에서 언급한 방식)\n - 참조 논문(Using Explainability for Constrained Matrix Factorization): \n - item 기반 explainability 사용시:\n - \n - user 기반 explainability 사용시:\n - \n\n### Unbiased Explainable BPR (UEBPR)\n\n- objective function:\n - \n- 가정\n - \n - Y_u,i: user 가 item 과 인터렉션을 했는지 여부 (예: 클릭 여부) = 노출이 되고, 관련성도 있다\n - O_u,i: user 에게 item 이 노출됐는지 여부\n - \n - R_u,i: user 에게 item 이 관련성이 있는지 여부\n - \n - \n\n#### Unbiased BPR Loss (UBPR)\n\n- objective function:\n\n\n#### Ideal Explainable BPR\n\n- objective function:\n\n\n\n\n#### Partially Unbiased Explainable BPR (pUEBPR)\n\n- objective function:\n\n\n## Results\n\n\n\n" }, { "path": "paper_review/recsys/recsys2021/Evaluating Off-Policy Evaluation- Sensitivity and Robustness.md", "content": "# Evaluating Off-Policy Evaluation- Sensitivity and Robustness\n\n- Paper : \n- Authors : Yuta Saito, Takuma Udagawa, Haruka Kiyohara, Kazuki Mogi, Yusuke Narita, Kei Tateno\n- Reviewer : iggy.ll\n- Topics\n - [#Metrics_and_Evaluation](../../topics/Metrics%20and%20Evaluation.md)\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 이 논문의 목표는 online에 올려보지 않고 모델을 평가하는 것입니다.\n![image](https://user-images.githubusercontent.com/38134957/165455983-1bb220ad-6dfd-4a13-8289-acb2cd085277.png)\n- 모델: 유저가 페이지에 접속했을 때, 유저의 정보, 시간 정보 등을 활용해 A안/B안/C안 중 어떤게 나을 지 확률적으로 결정합니다. e.g., [0.4, 0.3, 0,3]\n\n![image](https://user-images.githubusercontent.com/38134957/165455992-47c46f81-78d5-4adb-adde-5324939f8ed3.png)\n\n- context x: 유저가 접속한 시간, 유저 정보 등.\n- action: 보여준 페이지 레이아웃\n- reward:유저가 클릭했거나 안 했거나, 우리가 보여준 레이아웃에 따른 유저의 행동 결과(숫자)\n 여기서 문제는 $p(r_i...)$를 알 수가 없다는 점과, 모델이 아이템을 선택해서 보여주어야 그에 대한 결과를 만들 수 있다는 점이 있습니다.\n\n## Approach\n\nOff Policy Evaluation은 두 가지 분류로 나눌 수 있습니다.\n\n1. Direct Method (DM): mean reward 자체를 estimate하는 방법\n2. Inverse Propensity Weight (IPW), SNIPW: logging policy, or base policy의 log를 요구하는 방법\n\n그리고 저 두 가지 방법을 함께 사용하는 방법들도 있습니다.: DR, SNDR, Switch-DR, DRos\n\nDM은 모델을 하나 더 만들어야 하기 때문에, 이 모델에 관한 하이퍼패러미터를 또 신경써주어야 합니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165455998-662b684f-72fb-4243-b7ad-dfa4b279b2b6.png)\n\n## Conclusion\n\n- mean reward를 estimate하기 어렵기 때문에 계열의 방법은 사용하지 않는게 좋을 것 같습니다.\n- SNIPW가 일반적으로 가장 괜찮았습니다. (적절히 Calibration해줄 수 있다면 IPW를 써도 괜찮을 것 같습니다.)\n- 적절히 Calibration해줄 수 있다면 logging policy를 estimate한 값으로 (logging policy를 따라하도록 다른 모델을 학습해서) 사용해도 나쁘지 않아 보입니다.\n - 이건 조금 이상한게, logging policy를 이미 갖고 있으면 이를 사용하지 왜 다른 estimator를 더 만들어야 하는지는 잘 모르겠습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165456009-7fd20f91-122e-43fd-b3a3-105809c1cfa4.png)\n" }, { "path": "paper_review/recsys/recsys2021/Follow the guides- disentangling human and algorithmic curation in online music consumption.md", "content": "# Follow the guides- disentangling human and algorithmic curation in online music consumption\n\n- Paper : \n- Authors : Quentin Villermet, Jérémie Poiroux, Manuel Moussallam, Thomas Louail, Camille Roth\n- Reviewer : jinny.kk\n- Topics\n - [#Applications-Driven_Advances](../../topics/Applications-Driven%20Advances.md)\n - #Music_Recommendation\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Contribution\n 1. algorithmic guidance에 대한 유저의 태도에 따라 유저군을 선분류하고 각 유저군별로 나눠서 콘텐츠 소비 방식을 분석하였습니다.\n - “추천”이라는 개입이 유저의 소비 컨텐츠 다양성에 어떤 영향을 끼치는가는 논란이 많은 뜨거운 감자였다. 기존 연구들의 대부분은 유저들을 뭉뚱그려서 혹은 binary category (성별, 나이)로 나누어서 결과를 분석했는데 이 논문의 저자들은 유저가 플랫폼을 사용하는 타입별로 그 영향이 다르게 나타나므로 유저들의 그룹을 access mode에 따라 구분해서 영향을 분석하였습니다.\n 2. platform recommendation을 algorithmic 과 editorial로 나눠서 살펴보았습니다.\n 3. platform recommendation과 offline radio recommendation 간의 관계를 살펴보았습니다.\n- Key Observations\n - 음악 플랫폼에서 유저들이 음악을 주로 소비하는 경로 access mode (organic, algorithmic, editorial)에 따라 네 가지 유저그룹으로 (a, e, o, o+) 나누고, 유저들이 소비하는 음악의 다양성 (두 가지 디멘션: dispersion & artist popularity)을 유저 그룹별로 복합적으로 분석한 논문입니다. (그래서 정리하면서 좀 헷갈림...)\n - 소비의 diversity를 두 가지 디멘션에서 보았는데, 유저가 총 소비한 곡들 중 unique 곡들의 비중 측면 (dispersion)과 유저가 소비하는 음악의 아티스트의 인기도 측면 (popularity)입니다.\n - dispersion 측면에선\n - very organic users 보다 어떤 형태로든지 추천을 사용하는 유저들의 dispersion 값이 높았고,\n - 각각의 유저 클래스에서 각자의 main access mode를 통한 소비의 dispersion이 낮았습니다 (=그쪽에서 exploitation이 일어나는 것을 관찰하였습니다.)\n - (오프라인 vs 플랫폼) 라디오 프로그램들의 플레이리스트 dispersion < 온라인 플랫폼 내 대부분 유저들의 소비 dispersion\n - artist popularity 측면에선\n - algorithmic user들은 인기 있는 곡을 under-consume했고 editorial user들은 인기 있는 곡을 over consume하는 모습을 보였으며,\n - 모든 유저 클래스에 대해서 공통적으로 대체로 algorithmic access mode를 통해서는 덜 인기있는 곡들이, editorial access mode를 통해서는 인기 있는 곡들이 소비되는 경향이 보였습니다.\n - (오프라인 vs 플랫폼) 라디오 플레이리스트나 온라인 플랫폼 유저들이나 곡들의 평균 popularity는 비슷비슷했습니다.\n - 그리고 dispersion과 artist popularity간에 mild correlation도 관찰되었습니다.\n\n## Results\n\n### Dataset\n\n- Deezer (프랑스 음악 스트리밍 플랫폼) 2019년 1년동안 8639명의 구독자들의 play history (총 51m 개) (어떤 유저가 어떤 가수의 어떤 노래를 몇 분간 들었는지) + 노래에 접근한 경로 (access mode) (직접 검색, 추천 등)\n- 동일 기간동안 프랑스의 라디오 방송국 39곳의 플레이리스트 히스토리를 사용하였습니다.\n\n### User Practices\n\n#### Modes of access and user behavior classes\n\n- Three types of content access mode\n - organic (self-selected)\n - algorithmic (suggested by recommendation engine)\n - editorial (human curation)\n- 유저의 플레이 히스토리에서 각각의 access mode의 비율 (Pa (algorithmic), Pe (editorial), Po (organic))에 따라 유저 클래스를 4가지로 분류함.\n - `fig 1` 에 나타나듯 대부분의 유저가 organic mode 에 많이 의존하고 있긴 한데\n - 그럼에도 불구하고 구분이 가능하긴 하고 k means를 통해 `user class`을 4가지로 나누었습니다.\n - a (989명), e (655명), o (1614명), o+ (5381명)\n - 각 유저 클래스별로 number of plays의 분포는 비슷했습니다 (= 모든 클래스에는 active한 유저 덜 active한 유저가 모두 있습니다. 평균 activity는 e 유저 클래스에서 다소 낮긴 했습니다) (`fig 1 - right`)\n\n#### Two dimensions of diversity\n\n- dispersion: (functional diversity - denoting the lack of redundancy in the listening history)\n - 정의 = S (number of unique songs) / P (number of plays)\n - `fig 2 - left`\n - 각 유저 클래스별로 linear model을 fit해서 경향성을 보았더니 모든 유저 클래스에서 activity (P) 와 dispersion은 inverse relationship을 보였습니다.\n - 하지만 동일 P에 대해선, o+ 인 유저들이 가장 낮은 dispersion을 보였습니다. 즉, algorithmic이든 editorial이든 어떤 형태로든 플랫폼의 추천 모드를 활용하는 유저군들에서 dispersion 값이 더 높게 나타났습니다.\n - o+ 유저들은 플랫폼을 “digital librarian”이 아니라 “digital library”로 사용하는 것이라고 표현하였습니다.\n - “even a moderate use of some form of recommendation is generally associated with a higher level of exploration.”라고 해석하였습니다.\n - `fig 3`\n - 각 유저 클래스에서 각 access mode 별로 dispersion 값들을 확인했는데 모든 유저 클래스에 대해 각 클래스가 중점적으로 사용하는 access mode에서의 dispersion 값이 낮았다. 예를 들어 algorithmic 유저 클래스에선 alogrithmic access mode에서 dispersion이 낮고 이랬다.\n - “Users tend to prioritize exploitation in their preferred mode of access, and favor exploration in the others, in terms of more dispersed plays.”\n- artist popularity (semantic diversity - denoting the tilt toward songs by more popular artists.)\n - 정의 = 그 아티스트의 곡들의 재생 횟수를 바탕으로 아티스트들을 4개의 인기도 구간으로 나눔 (각 인기도 구간의 재생 횟수 합이 비슷하게 되도록)\n - 인기도 구간: (높은 인기도) v1 - v2 - v3 - v4 (낮은 인기도)\n - `Table 2`\n - 곡들은 아티스트의 인기도에 상관없이 대부분 organic access mode를 통해 소비되는 비중이 가장 높았다.\n - algorithmic access mode는 중간 인기도의 곡들을 주로 소비하는 통로가 됨을 알 수 있고, editorial access mode는 높은 인기도의 곡들의 비중이 많음. organic은 제일 인기 있거나 제일 인기 낮은 곡들의 비중이 많음.\n - `fig 4 -left`\n - artist popularity와 dispersion이 서로 연관이 되어 있다. 인기도 낮은 아티스트 곡 소비하는 (x축 우측) 유저들의 dispersion 값이 더 높더라 (y축).\n\n#### User types and access mode biases\n\n- user type, access mode, diversity가 어떻게 상호 작용을 하는지 “disentangle”한 그래프가 `fig 5.` 그래프의 y축이 완전히 이해 가는 것은 아님.\n - 각 유저 타입별로 소비하는 곡들의 인기도 경향성이 어떻게 되는지를 보여준 건데, access mode에 따라 세분화한 게 밑에 있는 그림.\n - `fig 5 - top` : algorithmic users under-consume popular artists, editorial users over-consume popular artists, organic users favor less popular artists in monotonous manner, and very organic users 는 인기도 양 극단에서의 소비가 “약간 더” 많다. (그림에서 잘 보이지 않기는 하는 듯..)\n - `fig 5 - bottom` : 유저 타입 구분 없이 모두 전반적으로, algorithmic access로 덜 유명한 아티스트 곡 소비가 되고 editorial access는 인기 있는 아티스트 곡 소비로 치우치고 organic은 그 사이 어디쯤을 보여주는 것으로 해석함.\n\n### The diversity of human-assisted guidance\n\n- 바로 위에서 관찰한 것 중에서, algorithm으로는 덜 유명한 곡 소비를, editor들은 유명한 곡 소비를 이끌어내는 경향성이 보인다는 점이 있는데, 이를 좀더 확인하기 위해 전통적인 오프라인의 editorial 추천이라고 볼 수 있는 라디오 프로그램 플레이리스트를 분석했다.\n- `fig 6 - left`\n - 대부분의 user type이 라디오 프로그램들보다 높은 dispersion을 보여줬다. 즉 라디오 프로그램은 보다 제한적인 카탈로그에서의 exploitation으로 기울어져 있다는 이야기.\n - 그리고 색깔 그라데이션 보면 알 수 있듯, dispersion과 popularity의 mild correlation도 볼 수 있다.\n- `fig 6 - right`: 대부분의 user type이 중간 부근에 있다. 즉 해석하면 “while online music listening practices seem to foster functional diversity (dispersion), in terms of semantic diversity (popularity) they seem, on average, to be neither significantly above nor significantly below the mass of the radios we focus on.”\n\n### Concluding Remarks\n\n- future work로 언급하는 것들\n - “the chronology of access modes to a song probably carries valuable information.” (특정 곡이 어떤 access mode를 통해 최초 발견되었는가.)\n - “user trajectories and transitions between classes”\n\n## Conclusion\n\n- 우리의 경우도 비즈니스 로직이 항상 끼어 들어가서 human curation에 의한 것과 알고리즘에 의한 것이 복합적으로 섞여 있는 경우가 많은 것 같아서 공감이 되었다. 몇 가지 디테일들은 잘 이해 못 한 것도 있는데, 나름 흥미로운 논문이었다.\n - (diversity를 functional diversity (number of unique songs played / total number of plays) 와 semantic diversity (popularity) 로 나누고, semantic diversity를 보기 위해 왜 embedding space를 사용한 diversity가 아니라 인기도를 보았는지를 기술했는데, 그 이유가 잘 이해가 안 갔다.)\n- primary access mode 별로 유저들을 분류하고, 각 access mode 별로 소비하는 음악의 다양성이 어떻게 달라지는지 분석하고, 알고리즘이든 사람이든 큐레이션을 이용하는 유저집단이 좀더 다양한 소비를 한다는 분석 내용이 인상적이었다.\n- 기존의 filter bubble 효과를 주장한 논문들과는 달리 이 논문에선 오히려 추천 알고리즘을 이용하는 유저군에서 다양성 수치가 높게 나왔다는 점이 의외였고 추천 알고리즘에 의해 filter bubble에 갇힌다가 myth일 수도 있겠다는 생각이 들었다. 문제는 이 논문이 사용한 데이터셋인 Deezer 음악 플랫폼이 사용하는 추천 알고리즘이 무엇인지에 대한 설명이 없다는 점이다. 추천 알고리즘과 filter bubble에 대해 상반된 결론을 내리는 논문들을 다 모아놓고 리뷰해보면 어떨지.\n" }, { "path": "paper_review/recsys/recsys2021/I want to break free! Recommending friends from outside the echo chamber.md", "content": "# I want to break free! Recommending friends from outside the echo chamber\n\n- Paper : \n- Authors : Antonela Tommasel, Juan Manuel Rodriguez, Daniela Godoy\n- Reviewer : iggy.ll\n- Topics\n - [#Echo_Chambers_and_Filter_Bubbles](../../topics/Echo%20Chambers%20and%20Filter%20Bubbles.md)\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 논문에서 제안하는 GNN 모델에서는 사실 별로 특별히 느끼는 점이 없었습니다.\n- Echo chamber로 인해 나타날 것이라 생각이 드는 현상이나 가설을 실험으로 잘 재현한다음 풀어내는데, 이게 정말 잘 된 것 같아서 공유합니다.\n\n## Approach\n\n### 친구 추천\n\n유저 집합 U, 아이템 집합 I가 존재한다고 가정하자. 기존의 추천이 다루는 것은 다음과 같습니다.\n\n1. p(r_{ui}\\vert u \\in U, i \\in I) (연관추천)\n2. \\text{sim}(i \\in I, j \\in I) (아이템추천)\n\n친구 추천은 p(r_{uv}|u \\in U, v \\in U)을 푸는 것이 목표입니다.\n\n기존의 데이터는 주로\n\n- 유저-아이템 인터랙션 (u, i, c) where u \\in U and i \\in I, and c is context w.r.t. user-item relationship.\n이런 형태의 데이터가 주어지는데, 친구 추천에서는 다음과 같은 데이터가 새롭게 주어집니다.\n- 유저-유저 인터랙션 (u, v, c) where u, v \\in U, and c is context user-user relationship \n 그리고 기존의 (u, i, c)가 존재하지 않을 수도 있고, 추천 팀이 담당하는 서비스 중에서는 `mm에서의 친구 추천`이 친구 추천을 요구하는 영역 중 하나입니다. `친구 추천`을 다루는 추천 영역이 지금은 많지 않지만, 지금까지는 이런 문제에 그리 큰 관심이 없었던가, 기존 연관 추천/아이템 추천 문제로 캐스팅해서 풀고 있었던 것 같습니다. 친구 추천이 가진 특성을 활용해서, 연관/아이템 추천을 방법보다 더 좋은 성과를 낼 수 있다면 팀 내에서, 그리고 회사 내의 서비스에 적용할 만한 요소는 많을 것 같습니다.\n\n### (가정) Relevancy보다 Diversity가 더 중요하다.\n\n논문 내에서 암묵적으로 가정하고 있는 것들을 정리해보면 이렇습니다. 친구 관계 그래프에서는 일반적으로 유저들은 작은 그룹(클러스터)로 묶일 수 있고, 유저-유저 인터랙션은 대부분 이 클러스터 안에서 이뤄지고, 또한 한 클러스터 내의 유저들의 아이템 소비 패턴도 유사합니다. 이를 고려하지 않는 추천 시스템이 일반적으로 이 커뮤니티 내부에서만 추천을 만드는 경향이 있습니다. 이를테면, MF 모델을 사용한다면 (클러스터가 완벽히 분리된다고 가정한다면) 큰 interaction matrix M은 사실 다음과 같이 분해될 수 있습니다.\n\n$$\nM \\simeq \\begin{bmatrix}M_1 & 0 & 0 \\\\0 & M_2& 0 \\\\ 0 & 0 & M_3 \\end{bmatrix}\n$$\n\n이러한 matrix에 대해 MF 모델은 사실 많은 MF 모델 여러 개를 만드는 것과 유사한 효과를 만듭니다. 또한, 클러스터 밖의 추천/유사도 비교를 힘들게 만듭니다. 따라서, 모델은 클러스터 내부의 유저와 그 유저들이 소비하는 아이템 이외의 추천을 생성하지 않으며, 이 효과는 추천 시스템이 deploy될 수록 고착화된다고 볼 수 있고, 이는 서비스/지표에 해롭습니다. 따라서 Diversity나 Novelty를 고려한 평가가 이뤄져야 한다는 것이 이 논문의 주장인 것 같습니다. 이 가정이 설득력이 있다는 생각은 들긴 하는데, 논문에서 자세한 근거를 제시하지는 않았습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Local Factor Models for Large-Scale Inductive Recommendation.md", "content": "# Local Factor Models for Large-Scale Inductive Recommendation\n\n- Paper : \n- Authors : Longqi Yang, Tobias Schnabel, Paul N. Bennett, Susan Dumais\n- Reviewer : bell.park\n- Topics\n - [#Scalable_Performance](../../topics/Scalable%20Performance.md)\n - #Local_Model\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- User-Item co-clustering을 사용해서 Local Model의 개수를 늘릴 수 있도록 추천 모델을 디자인한 논문입니다.\n- User 기준 inductive 상황에서도 모델이 추천 결과를 계산할 수 있도록, item에 대해서만 embedding 을 학습하였습니다.\n- 추천 성능도 기존 local model, global model 모두에 대해서 개선이 되었습니다.\n - 그런데, 이걸 local model이라고 부를 수 있는 구조인지 의문이 들었습니다.\n\n## Approach\n\n### 문제 인식\n\n- Local Model은 user subgroup에 대해서만 추천을 하는 모델을 여러개 만들어, subgroup 마다 다른 모델로 추천을 하는 방식입니다.\n - User subgroup마다 소비 취향이 다를 것이다라는 가정이 있고, 여러 선행 연구에서 괜찮은 접근임이 이미 검증되었습니다.\n- User subgroup마다 모델을 만들어야 해서, 모델이 무겁다면 subgroup 개수에 제한이 생깁니다.\n - 선행 연구에서는 대부분 40-50개 수준이고 100개 정도 쓰는 모델(rGLSVD)은 파라미터가 10억개나 됩니다.\n- Subgroup을 나누는 단계와 Subgroup의 추천을 계산하는 단계가 나뉘어 있고 이로 인해 inductive 상황에서 추천이 어렵습니다.\n - Subgroup을 나누는 것도 학습이 필요한데, 선행 연구 대부분이 이걸 inductive 상황에서 못하는 모델입니다. (factorization)\n\n### 제안 모델\n\n- 이 논문에서는 User representation을 소비한 item의 embedding으로 표현하였습니다. (Fig1에서 (b))\n - item embedding을 N-head self-attention을 돌려서 N 차원 벡터로 표현하였습니다.\n- Differentiable Latent Co-Clustering에 User representation, Item representation을 넣어서 학습하였습니다. (Fig1에서 (c))\n - 이름이 거창하긴 하지만 실제로는 ReLU activation 이후, Min-Sum pooling이 전부입니다.\n - ReLU 가 negative score를 제거, 클러스터 멤버십 기능을 하게 됩니다.\n- 학습은 선행 연구(VAE-CF) 따라서 Softmax loss로 학습하였습니다.\n- 클러스터 개수는 512개에서 2048개까지 늘려보았다고 합니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165453119-86f76cbe-a56d-4fb5-b5eb-548e35e49394.png)\n\n## Results\n\n![image](https://user-images.githubusercontent.com/38134957/165453125-67be3ed8-fe00-46dd-a645-b3ec4c7b52b2.png)\n\n- 기존 모델들 대비 성능이 소폭 좋긴한데, 큰 차이는 아닙니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165453135-058c39a8-67d8-4174-b41e-21aae392bc14.png)\n\n- 같은 성능을 더 적은 파라미터로 만들었다는데에 의의가 있습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165453142-8e4006b4-1db4-4b96-b07d-5927f9ac7e62.png)\n\n- 클러스터 개수를 늘리면 당연하게도 성능이 추천 증가하게 됩니다.\n" }, { "path": "paper_review/recsys/recsys2021/Matrix Factorization for Collaborative Filtering Is Just Solving an Adjoint Latent Dirichlet Allocation Model After All.md", "content": "# Matrix Factorization for Collaborative Filtering Is Just Solving an Adjoint Latent Dirichlet Allocation Model After All\n\n- Paper : \n- Authors : Florian Wilhelm\n- Reviewer : tony.yoo\n- Topics\n - [#Theory_and_Practice](../../topics/Theory%20and%20Practice.md)\n - #Matrix_Factorization\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Matrix Factorization 문제를 Latent Dirichlet Allocation 으로 접근하여 interpretability를 향상시켰습니다.\n- 추천시트템에 맞게 Bias term을 추가(기존 단점 개선)한 LDA4Rec 을 제안하여 Classic LDA 대비 성능 향상이 있었습니다.\n- LDA4Rec의 rating 예측으로 MF, NMF(Non-negative MF), SNMF(Semi-NMP)의 personalized ranking 처럼 사용 할 수 있다는 걸 증명하였습니다. (증명 관점에서는 다루지 않겠습니다.)\n\n## Approach\n\n### Matrix Factorization\n\nUser, item 에 대한 latent vector 에 item에 대한 bias 가 있는 MF를 벤치마킹하였습니다.\n$$\n\\hat{x} = < \\mathbf{x}_u , \\mathbf{h}_i > + b_i\n$$\n\n### LDA Approach\n\n아래의 [Probabilistic Graph Model, PGM](https://en.wikipedia.org/wiki/Graphical_model) 을 보면, 관측되는 $i_{us}$ 를 이용하여 다른 변수들을 [EM algorithm](https://en.wikipedia.org/wiki/Expectation%E2%80%93maximization_algorithm) 을 통해 unsupervised 방법으로 학습해나가게 됩니다. (기존 모델은 [smoothed LDA](https://www.jmlr.org/papers/volume3/blei03a/blei03a.pdf))\n\n| 기존 | 변형 |\n| ------------------------------------------------------------ | ------------------------------------------------------------ |\n| \"image-20220111110340092\" | \"LDA4Rec\" |\n\nNotation: $\\boldsymbol{\\varphi}_k \\in \\mathbb{R}^{\\vert \\mathcal{I} \\vert}$, $\\boldsymbol{\\theta}_u \\in \\mathbb{R}^{\\mathcal{\\vert K \\vert}}$ (보충: $\\mathbf{c} \\in \\mathbb{R}^{\\vert \\mathcal{I} \\vert}$)\n$$\n\\begin{align}\n\\delta_i &\\sim LogNormal(\\mu_\\delta, \\sigma_\\delta) \\\\\nz_{us} &\\sim Categorical(\\boldsymbol{\\theta}_u) \\\\\ni_{us} &\\sim p(i_{us} \\vert \\boldsymbol{\\varphi}_{z_{us}}, \\delta_i, \\lambda_i) \\\\\np(i_{us} &\\vert \\boldsymbol{\\varphi}_{z_{us}}, \\delta_i, \\lambda_i) := Categorical(\\Vert \\mathbf{c} \\Vert_1^{-1}\\mathbf{c}) \\\\\n\\mathbf{c} &= \\boldsymbol{\\varphi}_{z_{us}} + \\lambda_u \\cdot \\boldsymbol{\\delta}\n\\end{align}\n$$\n\n## Results\n\n### Datasets\n\n- Split: train(90%), valid(5%), test(5%)\n- The explicit feedback of these datasets was treated as implicit.\n\n| Movielens-1M, MoiveLens-100K | Goodbooks |\n| - | - |\n| 1 million movie ratings across 6,040 users and 3,706 movies
100 thousand interactions across 610 users and 9,724 movies | 6 million interactions across 53,425 users and 10,001 books |\n\n**Note**: LDA4Rec의 evaluation 과정에서 rating 예측을 item 하나씩 해야하기 때문에 유저당 10000개씩만 샘플링 하여 측정하였습니다.\n\n> The bottleneck of LDA4Rec is the prediction of the personalized rankings for which we need a high number of samples per user to compute a stable ranking. Thus for each user 10,000 items were sampled.\n\n### Performance\n\n- MoiveLens-100K 에서 성능 향상이 있었습니다.\n\"ex1\"\n\n아쉽게도 Goodbooks에서 LDA4Rec 비교가 빠져 있지만, MF가 SNMF 보다 성능 면에서는 우수했습니다.\n\"ex2\"\n\n## Conclusion\n\n- Traditional LDA 를 the popularity of items 과 conformity of user를 통합하여 성능 향상을 이끌어 내었습니다.\n- MF의 personalized ranking과 NMF, SNMF, LDA4Rec의 personalized ranking으로 transformable하다는 걸 증명하였습니다.\n- (MF대비) accuracy의 큰 손실 없이 interpretability를 높혔습니다.\n\n### Question & View\n\n- Q. Item에 대한 user의 bias로 접근하였는데, 굳이 종속적인 방법으로 할 필요가 있을까?\n- Evalutaion 이 느리다는 단점 때문에 실용면에서 떨어집니다.\n- Q. Latent representation의 most_similar 값으로 추천을 하면 성능이 어떨까?\n- Accuracy 손실이 적다고 했는데, 데이터 셋 향샹을 보인건 겨우 movielen-100K 뿐입니다.\n- Q. MRR과 recall은 높지만, precision이 좀 떨어지는 걸로 봐서 implicit nDCG 측정이 있었다면 어땠을까?\n" }, { "path": "paper_review/recsys/recsys2021/Mitigating Confounding Bias in Recommendation via Information Bottleneck.md", "content": "# Mitigating Confounding Bias in Recommendation via Information Bottleneck\n\n- Paper : \n- Authors : Dugang Liu, Pengxiang Cheng, Hong Zhu, Zhenhua Dong, Xiuqiang He, Weike Pan, Zhong Ming\n- Reviewer : charlie.cs\n- Topics\n - [#Privacy_Fairness_Bias](../../topics/Privacy,%20Fairness,%20Bias.md)\n - #Bias\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 추천 시스템에서 수집한 feedback 데이터의 bias를 효율적으로 완화(alleviate)할 수 있는 debiased information bottleneck (DIB) objective function을 제시하였습니다.\n- 제시된 DIB objective function은 intractable 한데, 이를 information theory에 기반하여 tractable 한 solution으로 derive할 수 있었습니다.\n- 기존 추천 시스템에서 debiased를 위한 대부분의 방법들은 bias generation process를 고려하지 않았기 때문에 특정 bias 가 발생하는 현상에서만 적용할 수 있는 문제가 있었습니다.\n - Related works: (1) heuristic-based (2) inverse propensity score-based (3) unbiased data augmentation (4) some theoretical tools-based\n- 해당 논문에서는 confounding bias 라는 포괄적 형태의 bias를 정의하고, 이 bias를 완화하는 것에 초점을 두었습니다.\n\n## Approach\n\n### Confounding Bias\n\n![image](https://s2.loli.net/2022/01/11/wOSW7EnrHGF3CuR.png)\n\n- 일반적인 추천 시스템의 feedback event 생성 process는 Figure 1.(a)와 같습니다.\n - variable (the feature vector) `x`는 다음과 같은 세개의 변수로 구성되어 있다고 가정\n - Instrumental variables `I`, Confounder variables `C`, Adjustment variables `A`\n - 세 변수 중 `I`와 `C`는 treatment `T` 를 결정하고, 이는 outcome `y`에 간접적으로 영향을 미침\n - `T`는 시스템이 추천할 아이템을 선택하거나 아이템들을 rank 하는 과정을 의미하고, `y`는 추천 결과 (e.g. click)\n - 이 부분에서 position bias, popularity bias와 같은 다양한 bias가 feedback에 영향을 줌\n - `C` 와 `A`는 직접적으로 `y` 에 영향을 미침\n - unbiased feedback이 생성됨\n - 세 변수에 대한 구체적인 정의는 없지만, site된 논문(*Learning disentangled representations for counterfactual regression, ICLR 2020*)에서 예시를 통해 어느정도 이해할 수 있었음\n - 어떤 환자에 대한 context `x`를 기반으로 치료 방법 `T`를 정하고, 치료에 따른 결과 `y`가 있다고 가정\n - `I`는 환자의 재정 상태를 나타낼 수 있음: 부자면 높은 수준의 치료를 받거나 가난하면 저렴한 치료를 받아야 한다. 다만, 이것이 직접적으로 치료 결과에 영향을 미치진 않음\n - `C` 는 환자의 나이를 나타낼 수 있음: 나이에 따라 어떤 치료를 받는지도 결정되고, 나이가 치료 결과에 직접적인 영향을 미침\n - `A`는 환자의 유전적 정보를 나타낼 수 있음: 유전적 정보를 가지고 어떤 치료를 받을지는 일반적으로 고려하진 않지만, 이것이 치료 결과에 직접적인 영향을 미침\n- Confounding bias는 특정 bias들의 collection을 나타내며, 추천 시스템에서 간접적인 영향으로 인해 발생하는 the confusion of the observed feedback을 의미하게 됩니다.\n - 쉽게 말하면 Figure 1.(a) 와 1.(b)의 차이가 confounding bias\n - Figure 1.(b)는 `x`를 고려하지 않은 추천이므로, uniform random 추천을 생각할 수 있습니다.\n\n### The proposed method: DIB objective function\n\n![image](https://s2.loli.net/2022/01/11/AMLDoOWieNzfFnp.png)\n\n- 이 논문에서는 위에서 언급한 confounding bias가 embedding representation에 반영된다고 가정하고, embedding vector에 포함된 biased component `r`과 unbiased component `z`를 각각 학습 후, 실제 추천을 진행할 때는 `z`로만 구성된 feature vector로 treatment `T`를 선택하는 방향을 제시하였습니다.\n- `r`과 `z`를 제대로 학습하기 위해서는 다음과 같은 조건들을 만족해야 합니다.\n 1. biased된 변수의 영향을 줄이기 위해서 `z` 가 `x`에 대해 overfit 되면 안됩니다.\n 2. `z`는 label `y`를 정확하게 예측할 수 있도록 학습합니다. (direct effect 최대화)\n 3. `r`과 `z` 는 가능한 독립이어야 합니다. (to get a better distinction)\n 4. `r` 도 (`z` 정도 까지는 아니지만) `y` 를 예측할 수 있도록 학습합니다. (indirect effect)\n- 위와 같은 네 가지 조건을 만족하기 위해 다음과 같은 DIB objective function을 최소화 하는 방향으로 학습합니다. \n ![image](https://s2.loli.net/2022/01/11/t4miVPOTF3BjWwc.png)\n - `I(z;x)` 는 `x`와 `z`의 mutual information을 나타냅니다.\n- 이 함수는 최적화 하기에는 intractable 하므로, information theory에 기반하여 다음과 같이 conditional entropy 형태로 표현할 수 있습니다. \n ![image](https://s2.loli.net/2022/01/11/3HfXnKrsVFodJlw.png)\n - (a)는 `y`와 `y_z`간 cross entropy, (b)는 `y` 와 `y_r` 간 cross entropy, (c)는 `y`와 `y_{z,r}` 간 cross entropy\n - 여기서 `y_z`는 unbiased component `z`를 사용해서 생성된 label 이고, `y_r` 과 `y_{z,r}` 도 비슷한 맥락으로 생성된 label\n - (d)는 embedding representation의 robustness를 추가하기 위한 regularization term\n - variational approximation을 활용하여 `z`는 Gaussian 분포를 따른다고 가정했습니다.\n\n### Complement optimization process of DIB\n\n![image](https://s2.loli.net/2022/01/11/TiRa7SY62OHDKdX.png)\n\n## Results\n\n- 기존의 추천 모델 Matrix Factorization (MF)과 neural collaborative filtering (NCF)에 DIB를 적용하여 학습했을 때, 상대적으로 어느정도의 성능 향상이 있는지 실험하였습니다.\n - 측정 metrics: AUC, precision (P@K), recall (R@K), 그리고 nDCG(@50)\n- 두 개의 dataset을 사용: Yahoo! R3, Product\n - Yahoo! R3: 15,400 명 사용자의 1,000개 곡에 대한 ratings\n - Product: 300,000 명 사용자의 122개 광고에 대한 click records\n - test를 위해 unbiased 데이터를 확보해야 하는데, 이를 위해 일정 유저 군에게 랜덤 추천을 진행했다고 합니다.\n- Baselines\n - MF, NCF (classic reco models) / IPS, SNIPS (IPS-based) / AT, Rel, CVIB (theoretical tools-based)\n\n### MF\n\n![image](https://s2.loli.net/2022/01/11/CD2OhbjpTRe3ukA.png)\n\n- 제안한 DIB-MF가 가장 높은 성능을 보였습니다.\n- dataset 사이즈가 커질수록 상대적으로 높은 성능을 보였습니다.\n\n### NCF\n\n![image](https://s2.loli.net/2022/01/11/LGXFpr7stONHVjd.png)\n\n- metric@K 가 높을수록 좋은 성능을 보였습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Negative Interactions for Improved Collaborative Filtering- Don’t go Deeper, go Higher.md", "content": "# Negative Interactions for Improved Collaborative Filtering- Don’t go Deeper, go Higher\n\n- Paper : \n- Authors : Harald Steck, Dawen Liang\n- Reviewer : marv.20\n- Topics\n - [#Theory_and_Practice](../../topics/Theory%20and%20Practice.md)\n - #Netflix\n - #High-Order_Interactions\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Collaborative Filtering 모델에서 higher-order interaction을 어떻게 할 것인지에 대한 방법론을 새롭게 제안하고 있습니다.\n- Linear full-rank model을 통해 higher-order interaction을 넣을 수 있게 하였고, 그 결과 큰 데이터셋에서 딥러닝 기반 방법론들보다 좋은 성능을 보였습니다.\n\n## Approach\n\n이 논문이 다루는 모델은 SLIM -> EASE(Embarrassingly Shallow AutoEncoder) -> Pair(this paper) 순으로 발전시켰습니다. EASE와 이 논문에서 제안한 Pair만 보면 다음과 같습니다.\n\n### EASE\n\n- \n- hidden layer가 없는 autoencoder 모델입니다. 파라미터는 item-item weight matrix $B$입니다. objective는 다음과 같습니다. 이 때 X는 interaction matrix, F는 Frobenius norm을 의미합니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165149044-ef3a3166-7cf8-4f72-a7e4-a0f62376bd15.png)\n\n- solution은 다음과 같습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165149050-9ad54dd4-a2e0-4f84-a84a-274f0beae18b.png)\n\n### Pair (this paper)\n\n- Relation의 용어에 대한 설명은 다음과 같습니다.\n - pairwise($B_{ij}$ ) : 유저가 item i를 소비하였을 때, item j 의 선호 예측값을 의미합니다. 따라서 유저가 i랑 k를 소비 한다면, item j에 대한 선호도 예측값은 가 됩니다. \n - triplet : $(i, k, j)$는 위 정보를 바로 반영합니다. 유저가 i, k를 소비하였을 때 item j에 대한 선호도 예측값을 의미합 니다.\n- EASE 구조에 higher-order matrix를 추가한 간단한 extension입니다. EASE에서 학습하는 파라미터 은 각각의 의 미가 item i와 item j의 pairwise한 관계를 캡쳐한다고 볼수 있습니다. 따라서 유저가 i와 k 2개의 아이템을 볼 경우 이를 모델은 $B_{ij} + B_{kj}$를 통해 점수를 내게 됩니다. 이를 직접적으로 넣기 위해서, triplet relation (i, k, j)와 같은 higher order interaction을 뽑아서 넣어주었습니다. 이 때 넣을 수 있는 relation이 매우 커지는 데, 이는 등장 횟수로 잘라주었습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165149170-88ca1444-63ad-4974-a35d-f5c3be75f5d8.png)\n\n- EASE 구조를 이해한다면, 옆에다가 간단한 triplet relation matrix만 추가되었다고 보시면 됩니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165149222-fde9d3a5-dbbb-42d4-9ceb-88150dc537f9.png)\n\n## Results\n\n- triplet ralation을 추가함에 따라, VAE관련 모델들과 유사하거나 특정 데이터셋에서는 더 좋은 성능을 보여주었습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165149511-222df3aa-d06f-4180-a1eb-46d4e49be98f.png)\n\n- 이 그림은 higher order interaction이 score에 어떤 역할을 하는지를 보여주는 겁니다. pairwise relation은 positive value에 치중되어 있고, triplet relation은 negative value에 치중되어 영향을 줍니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165149528-e60a1189-495b-4b1f-8345-fae5128c2e7f.png)\n\n## Conclusion\n\n- 아직까지도 단순한 user-item interaction feature를 가지고도 발전할 여지가 많습니다. 위 구조는, 기존 EASE에다가 정 말 단순하게 많이 등장하는 triplet을 넣어서 학습한 구조이기 때문에 확장이 매우 쉽습니다. 그럼에도 기존 다양한 딥러닝 기반 방식들보다 성능이 비슷하거나 더 좋다는 것은, 온라인 실험상에서의 이점까지 고려할 때 좋은 모델인 것 같습니다. 식 이 쉬운것도 좋은 것 같습니다.\n- 다만 이 high-order interaction을 단순히 등장 횟수로만 자르는 건 cf의 약점인 cold-start item들에 대해 더 취약해질 것 같습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Next-item Recommendations in Short Sessions.md", "content": "# Next-item Recommendations in Short Sessions\n\n- Paper : \n- Authors : Wenzhuo Song, Shoujin Wang, Yan Wang, Shengsheng Wang\n- Reviewer : marv.20\n- Topics\n - [#Algorithmic_Advances](../../topics/Algorithmic%20Advances.md)\n - #Sequential_Recommendation\n - #Cold_Start\n - #Few-Shot_Learning\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 짧은 길이의 세션에 대해, 유사한 유저들의 세션을 가져온 다음(global module), 유저의 현재 세션과 결합(local module)한 뒤 Few-Shot Learning을 통해 추천(prediction module)하는 모델을 제안하였습니다.\n- Delicious, Reddit 데이터셋에서 기존 single / multi session 기반 모델들보다 좋은 성능을 보여주었습니다. 세션길이가 짧을 때 더 우수한 상대 지표를 보여주었습니다.\n\n## Approach\n\n### 1. 문제 정의\n\n- 실제 환경에서의 세션 기반 추천에서 대부분은 매우 짧은 세션입니다. 짧은 세션에서는 문맥에 대한 정보가 매우 제한적이고, 유사한 유저의 정보를 효율적으로 사용하지 못하며, 관련 있는 세션들을 어떻게 결합할 지에 대한 연구도 잘 이뤄지지 못했습니다.\n- 이 논문에서는 현재 세션과 유사한 세션을 찾고, 이를 현재 세션의 정보와 결합하여 추천을 내보내는 INSERT 모델을 제안하였습니다.\n\n### 2. 모델 구조\n\n![image](https://user-images.githubusercontent.com/38134957/165445878-9401f397-dd0f-4e7d-9d21-b07ed0e9c092.png)\n\n- Global Module : 유사한 유저들의 세션 정보를 활용하는 모듈입니다.\n - Candidate Similar Session Sets : 같은 아이템을 얼마나 interact하는 지의 여부로 판단됩니다.\n \n - Session Encoder : weighted sum of item embedding입니다.\n - SSRN : candidate에서 item embedding 각각에 대해 RNN을 구한 다음 similarity의 max pool을 취하게 됩니다.\n ![image](https://user-images.githubusercontent.com/38134957/165445889-6967f8e4-0a42-4055-9526-898bfd4d42ad.png)\n- Local Module : item sequence -> GRU\n- Prediction Module : MLP + softmax\n\n## Results\n\n![image](https://user-images.githubusercontent.com/38134957/165445895-50c7edb3-0f98-4e93-ba34-5f070497c0e3.png)\n\n![image](https://user-images.githubusercontent.com/38134957/165445903-1bc7da8b-2913-491e-8ea5-e7a9a7e6a79f.png)\n\n- Delicious, Reddit에서 짧은 세션들을 뽑아 평가하였습니다.\n- 논문에서 제안된 모델이 기존 session-based 모델들보다 짧은 세션에서 더 좋은 성능을 보였습니다.\n\n## Conclusion\n\n- FSL이라고 하지만 FSL의 장점인 in-context learning이 잘 발휘되어 보이지는 않았습니다.\n- 세션 기반 추천에서 유사 유저의 세션을 넣는 방법은 참고할 만한 부분인 것 같습니다.\n" }, { "path": "paper_review/recsys/recsys2021/ProtoCF- Prototypical Collaborative Filtering for Few-shot Item Recommendation.md", "content": "# ProtoCF- Prototypical Collaborative Filtering for Few-shot Item Recommendation\n\n- Paper : \n- Authors : Aravind Sankar, Junting Wang, Adit Krishnan, Hari Sundaram\n- Reviewer : matthew.g\n- Topics\n - [#Language_and_Knowledge](../../topics/Language%20and%20Knowledge.md)\n - #Few-Shot_Learning\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Long-tail item (interaction 갯수가 작은 대다수의 아이템) 에 대해서 성능을 떨어지는 문제를 개선하고자 한 논문입니다.\n- Item side information 없이 neural base recommender의 capability 만을 이용한 것이 특징입니다.\n\n### Contribution\n\n- Few-shot Item Recommendation\n - 피드백이 풍부한 head item으로 base recommender를 학습한 뒤, 이를 기반으로 fine-tuning하는 컨셉입니다.\n - Tail item의 단점인 head item과의 distribution mismatch 를 극복하고자 하였습니다.\n - 피드백이 풍부한 head item 데이터를 Meta Learning set up (support set & query set) 으로 변경하였습니다.\n - Data-rich head item에 대한 interaction으로부터 데이터를 sub-sampling하여 tail item의 피드백과 비슷한 distribution을 모사하였습니다.\n- Discriminative Prototype Learning\n - Tail item이 sparse interaction을 가진다는 단점을 보완하고자 하였습니다.\n - 특정 그룹을 대표하는 벡터들을 이용하여 Base Recommender를 teacher로 삼고 Knowledge Distilation을 진행하였습니다.\n- Architecture-agnostic Knowledge Transfer\n - Base recommender로 아무 NN 모델 (CF, GNN, AE 등)이나 사용 가능하다는 장점이 있습니다.\n\n## Approach\n\n![image](https://user-images.githubusercontent.com/38134957/165454645-80f8cb0a-7010-4714-8733-47dc73cbfd42.png)\n\n- ProtoCF Framework\n - head item으로 Neural Recommender를 pre-train합니다.\n - tail item을 head item의 특징을 이용하여 분류할 수 있도록 Meta Learning (1) / Knowledge Distillation (2) 을 적용합니다.\n - (1) 과 (2)를 gate algorithm으로 섞어서 각 아이템을 나타내는 $e_i$를 구합니다.\n\n### Preliminaries\n\n- user/item encoder의 자세한 구조는 이해하지 않아도 됩니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454668-11019734-63a6-4d4e-b314-d60b0658cf3c.png)\n- user/item latent feature 간의 dot product와 실제 feedback으로 손실함수를 생성합니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454676-8092178e-f18b-4f9f-b6a4-8ab5e05f7b97.png)\n- 아이템 간의 proximity (유사도) 를 구해내서 이를 knowledge distillation 단에서 사용합니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454684-224a27fe-12fc-43ce-828c-3dcb8e4d40c8.png)\n\n### Pre-trained Neural Based Recommender\n\n- head item 만을 이용하여 user/item encoder를 생성합니다.\n- 다양한 종류의 모델을 아무거나 사용할 수 있습니다. (논문에서는 BPR, VAE, CDAE를 사용함.)\n- 대신, NN 모델이여야 합니다.\n - tail item에 대해서도 embedding을 뽑아낼 수 있도록, 또한 이후에 knowledge distillation을 이용하여 학습시킬 수 있도록 위함입니다.\n\n### Few-Shot Item Recommendation\n\nmeta learning 방식으로 데이터 셋을 쪼개서 학습을 진행하였습니다.\n\n#### Task Formulation\n\n- head item 데이터를 sub-sampling하여 tail item 과 비슷한 상황을 가진 데이터 형태로 모사하였습니다.\n- 전체 head item 중 개의 아이템만 샘플링하였습니다.\n- head item i에 대해서 support set, query set으로 나누어서 meta learning방식으로 학습을 진행하였습니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454705-d58d10d4-b8ac-4e5c-a0ec-cc7582317c51.png)\n\n#### Item Prototype & Knowledge Distillation\n\n- item 에 대한 representation을 mean vector of the embedded support user set S_i 로 표현하였습니다.\n- 논문에서는 아이템을 소비한 유저들을 중심으로 한 clustering의 결과로 해석하였습니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454713-2f76743c-804d-4c58-9380-0352e323c8f4.png)\n- 그러나 해당 prototype만으로는 문제가 있는데,\n - 데이터가 매우 sparse해서 tail item에 대해서는 해당 값이 매우 noisy할 수 있습니다.\n - tail item에 대해서는 데이터의 분별력이 떨어지므로, 아이템 별로 거의 비슷한 값이 나올 수 있습니다.\n- 추가적으로 분별 가능한 inductive bias 역할을 하는 새로운 term이 필요합니다!\n\n#### Group Embedding\n\n- tail item을 좀 더 분별력 있게 설명하려면 head item과의 item - item proximity를 이용할 수 있습니다.\n- 그러나 아이템의 갯수가 많아지게 되면 pairwise proximity 를 직접 저장하고 불러오는 데에 한계가 생깁니다.\n- 따라서, Group Embedding 을 이용하여 item - item proximity를 저차원으로 묘사합니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454723-e40ea681-8fdc-407e-b172-a5b3ff19ecc0.png)\n- 직관적으로 생각해서 의 각 벡터가 아이템의 특정한 정보 (국가, 카테고리, 장소, 업종) 등을 표현한다고 생각하면 됩니다. (MMoE랑 비슷한 느낌으로 이해하면 좋을 듯.)\n- Group enhanced prototype $g_i$-> $z_i$와 $p_i$를 learnable parameter를 이용하여 attention을 처리하였습니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454757-cc599602-a7f7-40a6-8c95-32db9d4ca7bb.png)\n\n#### Knowledge Distillation\n\n- Base Recommender를 통해 구한 item-item proximity에 대한 정보를 $Z_M$에 심습니다.\n- $R_B$을 기준으로 i와 가장 비슷한 아이템 n=10개의 아이템에 대해서\n - base recommender / group-enhanced prototype 간의 Cross Entropy를 최소화하고자 하는 것입니다.\n\n ![image](https://user-images.githubusercontent.com/38134957/165454773-0b40f9f1-ee4c-474b-864f-ac2c9dbcf80c.png)\n\n### Final Item Embedding\n\n- $R_B$, $Z_M$로 구한 item embedding의 gated result로 최종 item embedding $e_i$를 구할 수 있습니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454780-0f1df03f-fdce-44ce-b91e-61bad1458cd2.png)\n\n### Few-shot Recommender Training\n\n- query set Q를 이용하여 query set에 속한 user와의 relevance score를 생성합니다. (by cosine similiarity) \n- 이 때 pair 는 값이 애초에 1이므로 Negative Cross Entropy를 최소화하는 방향으로 학습 진행하면 됩니다.\n ![image](https://user-images.githubusercontent.com/38134957/165454796-cdcfc957-e5fc-4286-9cfe-f978a026a337.png)\n- 이 때 p_F를 구하는 방법으로 두 가지 방식이 있습니다.\n - Multimodial Log-Likelihood ( 에 속하는 모든 아이템에 대한 softmax)\n - Logistic Log-Likelihood\n\n## Results\n\n### Overall\n\n- Epinions, Yelp, Weeplaces, Gowalla에서 실험을 진행하였습니다.\n- NCF Autoencoder > latent-factor models \n- ProtoCF는 SOTA를 overall item에서 앞서는 것을 확인할 수 있었습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165454805-57c15ef4-2d29-4b67-9a8d-85a16e47cd5c.png)\n\n### Few-shot Recommendation Result \n\n- interaction 갯수가 적은 구간일수록 ProtoCF >> baseline 경향이 강해졌습니다.\n- 아래 지표는 item들을 popularity 순서대로 그룹화한 것인데, interaction 갯수가 낮은 구간에서 성능 차이가 더 발생하는 것을 확인할 수 있었습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165454818-c911170a-7571-49f8-aa3a-c54b2b347f98.png)\n\n### Ablation Study\n\n- few-shot performance (long tail items with less than 20 interactions) 만을 기재하였습니다.\n- 모든 부분이 critical 하게 성능에 영향을 준 것은 아니나 (모델 자체가 와 의 앙상블이므로) 각 모듈이 성능 향상에 영향을 끼쳤습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165454837-af5810a4-a248-4298-b710-371b86431932.png)\n\n### Parameter Sensitivity\n\n- $\\lambda=0.01$ 에서 제일 성능이 좋고, 이후에는 커질수록 성능이 하락하였습니다.\n- $N$(task에서의 sample size)는 클수록 성능이 좋아지는 것을 확인할 수 있었습니다.\n" }, { "path": "paper_review/recsys/recsys2021/RecSys2021.md", "content": "# RecSys2021\n\n- [\"Serving Each User\"- Supporting Different Eating Goals Through a Multi-List Recommender Interface](\"Serving%20Each%20User\"-%20Supporting%20Different%20Eating%20Goals%20Through%20a%20Multi-List%20Recommender%20Interface.md)\n- [Accordion- a Trainable Simulator for Long-Term Interactive Systems](Accordion-%20a%20Trainable%20Simulator%20for%20Long-Term%20Interactive%20Systems.md)\n- [Burst-induced Multi-Armed Bandit for Learning Recommendation](Burst-induced%20Multi-Armed%20Bandit%20for%20Learning%20Recommendation.md)\n- [Cold Start Similar Artists Ranking with Gravity-Inspired Graph Autoencoders](Cold%20Start%20Similar%20Artists%20Ranking%20with%20Gravity-Inspired%20Graph%20Autoencoders.md)\n- [Debiased Explainable Pairwise Ranking from Implicit Feedback](Debiased%20Explainable%20Pairwise%20Ranking%20from%20Implicit%20Feedback.md)\n- [Evaluating Off-Policy Evaluation- Sensitivity and Robustness](Evaluating%20Off-Policy%20Evaluation-%20Sensitivity%20and%20Robustness.md)\n- [Follow the guides- disentangling human and algorithmic curation in online music consumption](Follow%20the%20guides-%20disentangling%20human%20and%20algorithmic%20curation%20in%20online%20music%20consumption.md)\n- [I want to break free! Recommending friends from outside the echo chamber](I%20want%20to%20break%20free!%20Recommending%20friends%20from%20outside%20the%20echo%20chamber.md)\n- [Local Factor Models for Large-Scale Inductive Recommendation](Local%20Factor%20Models%20for%20Large-Scale%20Inductive%20Recommendation.md)\n- [Matrix Factorization for Collaborative Filtering Is Just Solving an Adjoint Latent Dirichlet Allocation Model After All](Matrix%20Factorization%20for%20Collaborative%20Filtering%20Is%20Just%20Solving%20an%20Adjoint%20Latent%20Dirichlet%20Allocation%20Model%20After%20All.md)\n- [Mitigating Confounding Bias in Recommendation via Information Bottleneck](Mitigating%20Confounding%20Bias%20in%20Recommendation%20via%20Information%20Bottleneck.md)\n- [Negative Interactions for Improved Collaborative Filtering- Don’t go Deeper, go Higher](Negative%20Interactions%20for%20Improved%20Collaborative%20Filtering-%20Don’t%20go%20Deeper,%20go%20Higher.md)\n- [Next-item Recommendations in Short Sessions](Next-item%20Recommendations%20in%20Short%20Sessions.md)\n- [ProtoCF- Prototypical Collaborative Filtering for Few-shot Item Recommendation](ProtoCF-%20Prototypical%20Collaborative%20Filtering%20for%20Few-shot%20Item%20Recommendation.md)\n- [Reverse Maximum Inner Product Search- How to efficiently find users who would like to buy my item?](Reverse%20Maximum%20Inner%20Product%20Search-%20How%20to%20efficiently%20find%20users%20who%20would%20like%20to%20buy%20my%20item%3F.md)\n- [Semi-Supervised Visual Representation Learning for Fashion Compatibility](Semi-Supervised%20Visual%20Representation%20Learning%20for%20Fashion%20Compatibility.md)\n- [Shared Neural Item Representation for Completely Cold Start Problem](Shared%20Neural%20Item%20Representation%20for%20Completely%20Cold%20Start%20Problem.md)\n- [Sparse Feature Factorization for Recommender Systems with Knowledge Graphs](Sparse%20Feature%20Factorization%20for%20Recommender%20Systems%20with%20Knowledge%20Graphs.md)\n- [The role of preference consistency, defaults and musical expertise in users’ exploration behavior in a genre exploration recommender](The%20role%20of%20preference%20consistency%2C%20defaults%20and%20musical%20expertise%20in%20users’%20exploration%20behavior%20in%20a%20genre%20exploration%20recommender.md)\n- [Together is Better- Hybrid Recommendations Combining Graph Embeddings and Contextualized Word Representations](Together%20is%20Better-%20Hybrid%20Recommendations%20Combining%20Graph%20Embeddings%20and%20Contextualized%20Word%20Representations.md)\n- [Top-K Contextual Bandits with Equity of Exposure](Top-K%20Contextual%20Bandits%20with%20Equity%20of%20Exposure.md)\n- [Towards Source-Aligned Variational Models for Cross-Domain Recommendation](Towards%20Source-Aligned%20Variational%20Models%20for%20Cross-Domain%20Recommendation.md)\n- [Toward Unified Metrics for Accuracy and Diversity for Recommender Systems](Toward%20Unified%20Metrics%20for%20Accuracy%20and%20Diversity%20for%20Recommender%20Systems.md)\n- [Transformers4Rec- Bridging the Gap between NLP and Sequential & Session-Based Recommendation](Transformers4Rec-%20Bridging%20the%20Gap%20between%20NLP%20and%20Sequential%20&%20Session-Based%20Recommendation.md)\n- [Values of Exploration in Recommender Systems](Values%20of%20Exploration%20in%20Recommender%20Systems.md)\n" }, { "path": "paper_review/recsys/recsys2021/Reverse Maximum Inner Product Search- How to efficiently find users who would like to buy my item?.md", "content": "# Reverse Maximum Inner Product Search- How to efficiently find users who would like to buy my item?\n\n- Paper : \n- Authors : Daichi Amagata, Takahiro Hara\n- Reviewer : iggy.ll\n- Topics\n - [#Scalable_Performance](../../topics/Scalable%20Performance.md)\n - #Inner_Product_Search\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n## Approach\n\n### Notations\n\n- u_i in Q (User vectors)\n- p_j in P (Item vectors)\n- : dot product between a and b.\n\n### Maximum Inner Product Search (MIPS)\n\nGiven a user u_i \\in Q, Find \\text{Topk}(u_i) = \\text{argtopk}_{p_j \\in P} \n\n### Reverse Inner Product Search (R-MIPS)\n\nGiven an item q \\in P, Find a set of users u_i such that q \\in \\text{TopK}(u_i)\n\n### Main claim\n\nwith simple preprocessing, those three questions can be answered in constant time:\n\n1. Given query item q is included in \\text{Topk}(u_i) of the user u_i\n2. Given query item q is not included in \\text{Topk}(u_i) of the user u_i\n3. Given query item q is not included in \\text{Topk}(u_i) of all users u_i of some (not any) set of users u_i, or block B.\n\n#### Constructing Block B\n\n1. Perform Descending Sort Q, P according to their L2 norm. i.e., \\|\\|u_i\\|\\| \\geq \\|\\|u_j\\|\\| if i < j.\n2. appropriately partition user vectors Q. e.g., Q = [u_1, u_2, ...,u_6], then B_1 = [u_1,u_2, u_3], and B_2 = [u_4, u_5, u_6]\n3. define L_i (it is easier to write in python here)\n\n`L_i = np.array(sorted(dot(u_i, P[:50, :]), ascending=False))`\n`L(B) = np.min([L_i for u_i in B], axis=0)`\nL_i is sorted values of dot products between user u_i and item vectors with top-k norms.\n\nClaim 1. Given u_i, q, if \\leq L_i[k], then q \\notin \\text{TopK}(u_i)\nproof: L_i[k] is dot product between u_i and item p such that p is in top-K ranking in norm. Thus p cannot be higher than rank k and dot product with q is lower than dot product with p. Thus q cannot be in \\text{TopK}(u_i)\n\nClaim 2. Given u_i, q, if \\geq \\|\\|u_i\\|\\| \\|\\| p_k\\|\\|, then q \\in \\text{TopK}(u_i)\nproof: Let p to be a true top-k item. \\|\\|u_i\\|\\| \\|\\| p\\|\\| \\geq \\|\\|u_i\\|\\| \\|\\| p_k\\|\\| \\geq holds. Thus q must be in top-k ranking\n\nClaim 3. Given q, a block B and u_i is a first vector in B, \\|\\|u_i\\|\\| \\|\\|q\\|\\| \\leq L(B)[k], then q \\notin \\text{TopK}(u_i) for all u_i \\in B\nproof: \\max_{u_i \\in B} \\leq \\|\\|u_i\\|\\| \\|\\|q\\|\\| \\leq L(B)[k]. Then by Claim 1, it holds\n\n### Procedure\n\n```text\ngiven item query vector q\nret = {}\nfor B in Blocks:\n if we can skip block B using Claim 3:\n continue;\n for u in B:\n if we can skip u using Claim 1:\n continue\n if u, q satisfy Claim 2:\n ret.add(u)\n else:\n let TopK(u) using exhaustie search;\n if q in TopK(u)\n ret.add(u)\nreturn ret\n```\n\nNote:\n\n- We can parallelize easily along with Blocks.\n- Worst Case bound is equal to Exhaustive Search\n- No theoretical bound is given\n\n## Conclusion\n\n- 생각해보면 쓰이는 수학/프로그래밍 테크 기술이 난이도가 고등학교때 기하와 벡터 배웠을 때 딱 그 정도만 쓰는 것 같은데 아이디어가 진짜 좋은 것 같습니다.\n- 개선 여지가 많은 것 같다. 특히, Block Construction 부분에서, 블록 내부의 벡터들의 순서나, 블록 사이의 관계 측면에서 뭔가 개선할 여지가 있을 것 같은데 하는 생각이 듭니다. 아이디어를 일부로 약간만 풀고 세부적인 테크닉들은 공개 안 한 것 같습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Semi-Supervised Visual Representation Learning for Fashion Compatibility.md", "content": "# Semi-Supervised Visual Representation Learning for Fashion Compatibility\n\n- Paper : \n- Authors : Ambareesh Revanur, Vijay Kuma, Deepthi Sharma\n- Reviewer : matthew.g\n- Topics\n - [#Real-World_Concerns](../../topics/Real-World%20Concerns.md)\n - #Semi-Supervised_Learning\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Semi-Supervised Learning을 사용한 다른 모델들과 다르게, conditional mask를 통해서 color와 pattern 같은 attribute를 학습하는 것이 아니라 color, shape를 직접적으로 변경해주는 self-supervised learning의 방법론을 적용하였습니다.\n- pseudo-labeling를 이용하여 unlabeled-image를 이용하여 학습을 진행하였습니다.\n- Polyvore, Polyvore-D, newly created Fashion outfit dataset에 대해서, 적은 수의 labeled data를 사용하였고, text 등과 같은 metadata 를 전혀 사용하지 않았음에도 supervised method에 준하는 결과를 만들었습니다.\n\n## Introduction\n\n### Fashion Compatibility\n\n- 이 논문의 main task. 한글로 번역하면 **잘 어울리는 룩 만들기** 정도?로 볼 수 있을 것 같습니다.\n\n> compose matching clothing items that are appealing and complement well.\n\n### Problem & Contribution\n\n- 기존에는 handcraft labeling 을 했었으나 그걸 매번 진행하기에는 번거롭고 cost가 많이 듭니다.\n- 이를 해결하고자 **semi-supervised learning** 기법을 적용하였습니다.\n - 적은 양의 labeled data, 많은 양의 unlabeled data를 이용하여 supervised training에 준하는 학습 효과를 냄과 동시에, supervised learning의 단점인 overfitting을 해소하고, 일반화 성능을 끌어올리고자 하였습니다.\n - 다양한 기법 및 방법론이 존재하는데, 더 자세한 내용은 이 [포스팅](https://sanghyu.tistory.com/177)이 도움이 되었으니 읽어보시면 좋을 것 같습니다.\n - 이 논문에서는 다양한 기법 중에 아래와 같은 기법들을 도입하였습니다.\n - Proxy-label 기법 (labeled data로 학습한 뒤, unlabeled data를 labeling하고 그걸로 재학습.)\n - consistency regularization 기법 (기존 데이터에 대해서 일부 perturbated 된 데이터에 대해서도 예측의 결과는 일관성이 있어야 한다.)\n\n### Main Assumption\n\n- 기존 모델들처럼 각각의 attrbute를 implicit하게 배우는 것이 아니라 (MMoE와 같은 형태로 K개로 표현된 FFN의 모음으로 모델 구성.), explicit하게 attribute를 설정 (color, shape) 하고 해당 부분에 대한 특징을 표현하는 Representation을 찾고자 하였습니다.\n\n## Approach\n\n- 원하는 것은 `visual representation for the task of fashion compatibility`를 학습하는 것입니다.\n - Metric Learning을 적용한 목적함수를 설계하여 compatible한 아이템끼리의 embedding은 가깝게 하고자 하였습니다.\n - 이를 위해 (Anchor, pseudo-positive, negative) triplet을 만들어 학습을 진행하였습니다.\n\n### Loss\n\n$$\n\\mathcal{L} = \\mathcal{L_l} + \\lambda_{ss}\\mathcal{L_{ss}} + \\lambda_{pseudo}\\mathcal{L_{pseudo}}\\\\\n\\mathcal{L_l} = \\max{(0, d(\\phi_A, \\phi_P) - d(\\phi_A, \\phi_N) + m)}\\\\\n\\mathcal{L_ss} = \\max{(0, d(\\hat{\\phi_{u}}, \\hat{\\phi_{[s]}}) - d(\\hat{\\phi_{u}}, \\hat{\\phi_{[a]}}) + m)}\\\\\n\\mathcal{L_{pseudo}} = \\max{(0, d(\\hat{\\phi_{A}}, \\hat{\\phi_{P}}) - d(\\hat{\\phi_{u}}, \\hat{\\phi_{N}}) + m)}\n$$\n\n- Loss on Labeled item \n 기존에 존재하는 labeled data (A, P, N) 에 대해서는 A와 P는 가깝게, A와 N은 멀어지도록 학습을 진행하였습니다. 추가로 margin loss도 두었습니다.\n\n### Loss on Consistency Regularization\n\n- Self-supervised learning에서 일반적으로 사용되는 접근을 차용하였습니다.\n - Consistency Regularization의 가설 중 `perturbation`에 해당하는 전처리 방법을 self-supervised learning 관련 논문에서 영감을 받아 적용하였습니다.\n- `fashion compatibility를 위해서는 fashion item을 구분하는 중요한 attribute (color, shape)에 대한 구분 능력이 필요하다`는 전제를 이용하여, 한 아이템에 대해서 color와 shape를 바꾼 negative sample과의 discrepancy를 늘리는 방향으로 학습을 진행하였습니다.\n- 이러한 방법론들이 이미지를 돌리거나, color jittering을 하거나, 이미지에 대한 직소 퍼즐 형태의 퀴즈를 풀거나 하는 self-supervised learning에서의 pretext task와 비슷한 경향이 있어서 논문에서 그렇게 언급한 것으로 보입니다.\n\n### Data Augmentation on Pseudo-Labeled Data\n\n- (A, P, N) 에 대해서 embedding space에서의 nearest element (A', P', N')를 on-the-fly로 계산하고 이에 대한 margin loss를 계산하였습니다.\n- 계산 상의 속도를 높이고자 mini-batch 내에서만 nearest element를 찾는 방법을 취하였습니다.\n\n### Model Structure\n\n- siamese network와 비슷한 구조를 가지고 있습니다.\n - ImageNet pretrained CNN (ResNet18) -> fully-connected layer per category ($W_c$)\n- 학습 파라미터는 다음과 같습니다.\n - 256 batch size for labeled data, 1024 batch size for unlabeled data\n - margin $m$ 을 0.4 for margin loss\n - $\\lambda_{ss}=0.1\\quad\\lambda_{pseudo}=1$\n - adam optimizer, lr 5e-5, 10 epochs\n\n## Results\n\n- Polyvore (패션 커머스 서비스, ssense에 최근 합병됨) dataset, Polyvore-disjoint (Polyvore 중에서 train/valid/test에 중복된 이미지가 없도록 처리한 것), Fashion outfits (e-commerce platform에서 데이터를 크롤링하고 **같은 세션에서 산 아이템의 경우 compatible하다고 가정**)를 이용하여 학습을 진행하였습니다.\n- 5%의 labeled data만을 이용하여 supervised learning에 준하는 학습 결과를 얻을 수 있었으며 100%를 적용하면 supervised model들을 상회하는 성능을 보여주었습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Shared Neural Item Representation for Completely Cold Start Problem.md", "content": "# Shared Neural Item Representation for Completely Cold Start Problem\n\n- Paper : \n- Authors : Ramin Raziperchikolaei, Guannan Liang, Young-joo Chung\n- Reviewer : matthew.g\n- Topics\n - [#Practical_Issues](../../topics/Practical%20Issues.md)\n - #Cold_Start\n - #Representation_Learning\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Complete item cold start 환경에서의 새로운 hybrid 모델을 제안하였습니다.\n- User Interaction vector가 단순 user one-hot encoding vector보다 학습 과정에서 더 좋은 성능을 낸다는 것을 증명하였습니다.\n\n## Approach\n\n### User Interaction Vector\n\n- User Interaction Vector를 표현하는 방식에는 두 가지가 있습니다.\n 1. User ID\n 1. User ID에 상응하는 임베딩을 뽑아냄.\n 2. embedding matrix $E^u \\in \\mathbb{R}^{d^u}$ 에서 $z^u_j = I^u_jE^u \\in \\mathbb{R}^{d^u}$를 뽑아냄.\n 2. Interaction Vector\n 1. $z^u_i = g^u(R_{j,:}) = \\sigma(...\\sigma(R_j, W^u_1)W^u_2)... W^u_L)$\n- 이 중에서 (어찌보면 당연히,, ) 2번이 더 나은 결과가 나옵니다.\n - 이를 증명하는 방법으로 아래와 같은 방법들을 사용하였습니다.\n - training loss / recall이 가장 빠르고 높은 지점에서 수렴된다.\n - prob density at initialization 이 가장 normal distribution에 가깝다.\n - prob density at convergence 이 가장 normal distribution에 가깝다.\n - 이러한 점을 해석해보면 아래와 같이 정리가 가능합니다.\n - **$W^u_1 \\in \\mathbb{R^{n \\cross p}}$ 으로부터의 output은 user가 interact했던 아이템들의 임베딩의 합이다.**\n\n### Sharing neural Item rep with the hidden item embeddings\n\n- Item representations from the item model을 user model에서의 hidden item embedding으로 사용하였습니다.\n\n $$\n \\sum_{j,k\\in S^+\\bigcup{S^-}}{||(\\vb{z}^u_j)^T\\vb{z}^i_k - \\vb{R}_{ij}||^2} s.t. \\\\\n \\vb{z}^u_j = g^u(\\vb{R}_{j,:}) = \\sigma(...\\sigma(\\sigma(\\vb{R}_{j,:}\\vb{W}^u_1)\\vb{W}^u_2)...\\vb{W}^u_L)\\\\\n \\vb{W}^u_1 = g^i(\\vb{X}), \\quad \\vb{z}^i_k = g^i(\\vb{X}_k,:)\n $$\n\n### Faster training with a simpler formulation\n\n- 각 미니 배치마다 모든 아이템에 대한 $W^u_1$을 계산하는 것은 비효율적이라고 지적하였습니다.\n- 그래서 한 번 구해놓은 $W^u_1$을 이용해서 각 유저가 소비한 아이템 ($p \\in N_j$) 에 대해서만 $g_i$ 값을 구하는 식으로 처리하였습니다.\n$$\n\\vb{y}_j = \\vb{R}_{j,:}\\vb{W}^u_1 = R_{j,:}g^i(\\vb{X}) = \\Sigma_{p\\in N_j}g^i(\\vb{X}_{p,:})\n$$\n\n### Attention mechanism in learning uesr representations\n\n- 유저가 소비한 **모든 아이템이 같은 가중치를 가질 필요는 없다**고 주장하였습니다.\n - user의 representation을 구할 때에 k-th item rep와 비슷한 아이템일수록 높은 attention을 주는 구조로 각 아이템 vector에 weight를 부여하였습니다.\n $$\n \\sum_{j,k\\in S^+\\bigcup{S^-}}{||(\\vb{z}^u_j)^T\\vb{z}^i_k - \\vb{R}_{ij}||^2} s.t. \\\\\n \\vb{z}^u_j = g^u(\\sigma(\\vb{y_j})), \\quad \\vb{y}_j = \\Sigma_{p \\in N_j}\\alpha_{pk}g^i(\\vb{X}_{p, :}), \\quad \\vb{z}^i_k = g^i(\\vb{X}_k,:)\n $$\n - 이 때 가중치 $\\alpha_{pk}$를 주는 방식을 여러 가지로 두고 이에 대한 실험을 진행하였습니다.\n - dot product similarity\n - cosine similarity\n - general (with weight matrix)\n - 그리고 나서 attention과 같이 softmax 처리하여 $\\alpha_{pk}$를 구하고 이를 weight으로 정하였습니다.\n\n## Results\n\n### Dataset\n\n- CiteULike: 사용자가 인용을 저장하고 학술 논문에 공유 할 수있는 웹 서비스입니다.\n- Ichiba 1M, Ichiba 20M: *Rakuten Ichiba* (일본 온라인 전자 상거래 플랫폼) interaction 데이터.\n\n### Result\n\n#### Shared Item Representation\n\n- Sharing item rep이 더 적은 iteration에서 더 나은 recall을 보여주었습니다.\n- parameter 수가 많아지는 대규모 데이터셋에서 더 좋은 성능을 보여주었습니다.\n\n#### Attention Mechanism\n\n- Attention mechanism이 성능 향상에 도움이 되었다고 합니다.\n- Attention의 경우에도 attention 계산 시에 아래와 같은 두 종류로 모델을 나누었습니다.\n - item $i_k$ 그대로 사용하는 경우 (attention)\n - $i_k$는 제외하는 경우 (attention_rm_item)\n- attention의 경우가 training set recall이 더 높았습니다.\n- 그러나 general과 dot similarity의 경우 overfitting에 취약했던 반면, cosine similarity의 경우 Ichiba1M 데이터셋에 대해 overfitting은 적으면서도 (normalization의 효과로 보임), 가장 높은 recall을 기록하였습니다.\n\n#### Shared Item Representation & dataset size\n\nSharing item rep의 경우, 데이터셋의 크기가 작을 수록 더 모델 성능에 도움을 주는 것으로 확인되었습니다. (데이터셋의 크기가 작을 수록 nonshared와 성능 차이가 더 크다.)\n\n#### Comparison with other models\n\nCold-start 상황 해결을 다룬 다른 모델 (DropoutNet-WMF, ACCM, DeepMusic, CDL) 대비 CiteULike 데이터셋에서 높은 test recall을 기록하였습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Sparse Feature Factorization for Recommender Systems with Knowledge Graphs.md", "content": "# Sparse Feature Factorization for Recommender Systems with Knowledge Graphs\n\n- Paper : \n- Authors : Vito Walter Anelli, Tommaso Di Noia, Eugenio Di Sciascio, Antonio Ferrara, Alberto Carlo Maria Mancino\n- Reviewer : bell.park\n- Topics\n - [#Language_and_Knowledge](../../topics/Language%20and%20Knowledge.md)\n - #Knowledge_Graphs\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 지식그래프(Knowledge Graph)와 엔트로피 기반 feature selection을 결합해서 만든 추천 모델을 제안한 논문입니다.\n- 아이템 수에 따라 모델 복잡도(embedding)가 선형적으로 증가하는 기존 모델과 다르게 아이템 수가 늘어나도 모델 복잡도가 크게 증가하지 않습니다.\n- nDCG는 나쁘지만(MP보다도 나쁜 케이스도 있음), diversity 측면에서 좋은 부분이 있습니다.\n - 그러나 실험 신뢰도가 낮은 편입니다. MP > MF 케이스도 있는데 저는 결과를 납득하기 어려웠습니다.\n\n## Approach\n\n### 문제 인식\n\n- 최근에 DL 기반 추천 모델들이 많이 사용되지만, 이 모델들은 아이템 수가 늘어나면 embedding 개수를 늘려야해서 모델 복잡도가 계속해서 증가하는 단점이 있습니다.\n- Content-based와 접목시켜 만든 하이브리드 모델들도 아이템마다 feature를 concatenate하는 전략이 일반적이라 모델이 무거워지게 됩니다.\n\n### 제안 모델\n\n- 이 논문에서는 각 아이템의 특성을 지식 그래프에서 가져오고, 아이템의 추천 점수를 특성의 추천 점수 weighted sum으로 계산하였습니다.\n - 예를 들어, 아래 그래프에서 `Rijksmuseum`의 추천 점수는 ``, ``의 추천 점수의 weighted sum이 됩니다.\n - 각 특성 점수의 weight는 유저별로 다르게 적용이 되고, 정확하게는 user-feature 조합의 information gain으로 계산하였습니다.\n - information gain은 유저가 positive interaction한 아이템의 feature set을 대상으로 특정 feature를 넣었을 때와 제외했을 때의 entropy 차이를 의미합니다.\n - 예를 들어, 아래 그래프에서 모든 아이템은 다 `` 특성이 있어서 information gain이 0이 됩니다.\n - 대신 Pink가 고른 아이템 중 2개가 ``를 가지고 있어서 이 경우는 information gain이 0보다 크게 됩니다.\n- 각 특성의 점수는 MF 스타일의 간단한 방식으로 계산 (user embedding dot feature embedding + user bias)하였습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165144120-18389566-f60f-45ac-b64f-d0d089fec67f.png)\n\n## Results\n\n![image](https://user-images.githubusercontent.com/38134957/165144152-0fbeb043-11b6-4265-a6ca-f733787071e7.png)\n![image](https://user-images.githubusercontent.com/38134957/165144170-2732047d-f6f9-4689-8298-568659352c4c.png)\n![image](https://user-images.githubusercontent.com/38134957/165144161-ab065bdc-3a27-4058-b2aa-cad0883d66c6.png)\n\n- Movielens-1M, Facebook Books, Yahoo! Movies에서 평가하였습니다.\n- 저자들은 괜찮은 수준이라고 얘기하긴 하지만, nDCG 차이가 많이 나는 편입니다. Facebook Books의 경우 다른 메서드도 성능이 안좋긴하지만 MP보다도 결과가 안좋았습니다. nDCG가 추천 퀄리티를 담보하진 않지만 차이가 너무나는데 contribution이라고 보기 어렵다고 생각됩니다.\n" }, { "path": "paper_review/recsys/recsys2021/The role of preference consistency, defaults and musical expertise in users’ exploration behavior in a genre exploration recommender.md", "content": "# The role of preference consistency, defaults and musical expertise in users’ exploration behavior in a genre exploration recommender\n\n- Paper : \n- Authors : Yu Liang, Martijn C. Willemsen\n- Reviewer : jinny.kk\n- Topics\n - [#Interactive_Recommendation](../../topics/Interactive%20Recommendation.md)\n - #Music_Recommendation\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 유저의 preference가 시간이 지남에 따라 어떻게 발전하는지는 많이 연구되지 않았다는 문제의식에서 출발하여 음악 도메인에서 유저들의 short-term, long-term preference간의 관계를 이해해보고자 한 논문입니다.\n\n## Approach\n\n### 접근 방법\n\n- 음악 도메인에서 유저들의 short-term, long-term preference간의 관계를 이해해보자.\n - 정의: short-term은 session 내에서의 소비, long-term은 whole history에서의 소비를 뜻한다.\n - 그걸 이해하면 시간에 따라 유저의 취향이 어떻게 발전하는지 이해할 수 있을 것이고, 유저가 새로운 취향을 탐색할 때 어떻게 행동하는지 이해할 수 있을 것이고, 탐색 툴에서 우리가 유저를 어떻게 서포팅해주면 좋을지도 생각해볼 수 있을 것이기 때문이다.\n- 왜냐?\n - 유저의 취향이 시간이 지남에 따라 어떻게 발전하는지 취향의 stability가 있는지, 그들간의 관계는 under-explored되었다.\n - 이전 연구들이 보인 것들은, 단기 취향 ≠ 장기 취향인 것 같더라, 그리고 음악 도메인에선 유저의 음악적 전문성에 따라 청취 행태 (다양성, 추천 시스템 사용 방식)가 다르더라 정도였다.\n- 논문의 도메인: 음악\n\n### Research Questions\n\n- RQ 1: 시간에 따라 유저 취향이 어떻게 변화하는지 이해해보자. (users's preference consistency)\n - 스터디 디자인: data는 (다른 스터디에서 수집한) 스포티파이에서 319명의 유저들의 청취 기록을 사용했다. short (최근 4주), medium (최근 6달), long-term (모든 기록) preference는 track-level, artist-level, tag-level로 측정했다.\n - 유저의 음악적 전문성이 높을수록 (높은 MSAE 점수) 시간에 따른 더 일관된 (consistent) 취향을 가지더라.\n - short-term 과 medium-term 취향의 일관성이나, medium-term과 long-term 취향의 일관성 > short-term과 long-term 취향의 일관성. (어찌 보면 당연하긴 한 듯하지만..)\n- RQ 2: 유저는 새로운 취향을 어떤 방식으로 탐색할까?\n - (유저의 음악적 전문성에 따라 새로운 음악 장르를 탐색하는 방식이 달라질까?)\n - 스터디 디자인: 저자들이 수행한 이전 연구가 이미 있고, 거기에 새로운 분석을 추가한 느낌이다. 어쨌든, 유저들에게 장르 목록을 주고 탐색할 장르를 선택하게 했다.\n - 유저들은 현재 취향에 가까운 장르를 탐색하는 경향을 보였다.\n - 유저의 음악적 전문성이 낮을수록 (낮은 MSAE 점수) 취향이 less stable 하더라. 그래서 탐색할 때 (well-developed된) long-term 취향의 장르에 가까운 장르를 탐색하더라.\n - 유저의 음악적 전문성이 높을수록 (높은 MSAE 점수) 취향이 stable 하더라. 그래서 short, medium, long-term 취향의 것을 비슷비슷한 수준으로 탐색하더라.\n- RQ 3: 그렇다면 유저가 현재 취향보다 좀더 멀리 떨어진 취향을 탐색하도록 넛지할 수 있을까?\n - 스터디 디자인: 저자들이 고안한 interaction tool을 유저들이 사용하게 하였고, 2 X 3의 default conditions에서 between-subjects로 실험을 진행했다. 설정이 유저가 더 기존 취향으로부터 더 멀리 탐색하도록 넛지할 수 있는지 등을 분석하였다.\n - 2 X 3 default conditions\n - genre presentation order: 유저 취향에서 가까운 순 - 유저 취향에서 멀리 있는 순\n - 장르 내 플레이 리스트의 personalization-level을 컨트롤하는 slider position: fully personalized - middle - fully representative\n - RQ 3-1: 시스템의 Default order of genre presentation에 따라 유저가 현재 취향에서 좀더 먼 취향을 탐색하도록 넛지할 수 있을까?\n - 넛지할 수 있더라. 하지만 음악적 전문성이 높을수록 이에 영향 받는 정도가 적더라.\n - RQ 3-2: 시스템의 slider position의 default 세팅에 따라 유저들이 선택하는 추천의 개인화 정도가 달라질까?\n - 유저의 slider interaction 횟수에 따라 유저별로 경향성이 다르게 나타났다. Fig 6 참고.\n - low interaction group: final slider position은 default slider position에 강하게 영향 받았다.\n - medium interaction group: default slider position의 반대 방향으로 slider를 이동시켰다.\n - high interaction group: default에 덜 영향을 받았고, mixed position으로 slider를 이동시켰다.\n - 대체로 유저들이 선택한 slider position으로 미루어 볼 때, 최적은 personalization과 representativeness 사이 어딘가에서 형성되더라.\n - RQ 3-3: 유저들이 기꺼이 탐색하고자 하는 거리가 유저의 음악적 전문성에 따라 달리 나타날까?\n - path model을 구축해서 (Fig 7) default setting이 유저의 (현재 취향으로부터의) 탐색 거리에 영향을 끼칠 수 있다고 분석했다.\n\n## Conclusion\n\n- `Strong Points?`\n - 음악적 전문성에 따라 시간에 따른 유저 취향의 일관성 정도가 다르다는 걸 분석했다는 점이 흥미로웠다.\n - 유저들이 컨트롤할 수 있는 어떠한 디폴트 세팅이 주어졌을 때 어떤 방식으로 새로운 장르를 탐색하는지 분석한 점이 흥미로웠다.\n- `Weak Points?`\n - 논문에서는 \"취향\"을 CB적으로 정의하였고, CF적으로 정의한 것은 아니다.\n - 분석 논문인 것 같고, 그래서 이를 추천 시스템이 어떻게 반영해야 하는지의 방향성을 제시하지는 않는 것 같다.\n - 음악 도메인이라 유저의 전문성이 하나의 factor가 되었는데, 다른 도메인에선 다른 것이 factor가 될 수 있을 것 같다.\n" }, { "path": "paper_review/recsys/recsys2021/Together is Better- Hybrid Recommendations Combining Graph Embeddings and Contextualized Word Representations.md", "content": "# Together is Better- Hybrid Recommendations Combining Graph Embeddings and Contextualized Word Representations\n\n- Paper : \n- Authors : Marco Polignano, Cataldo Musto, Marco de Gemmis, Pasquale Lops, Giovanni Semeraro\n- Reviewer : tony.yoo\n- Topics\n - [#Language_and_Knowledge](../../topics/Language%20and%20Knowledge.md)\n - #Graph\n - #Sequence_Modeling\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\nMain author: [Marco Polignano](https://scholar.google.it/citations?user=sjQSYGQAAAAJ&hl=it) - BERT 기반의 감정 분석 연구를 많이 하신것 같습니다.\n\n- 두 가지 다른 정보(interaction feedback, text information)로 부터 user, item 임베딩을 얻는 hybrid 방법 제시하였습니다.\n - 정보를 융합하는 방법은 두 가지 concatenation 방법을 제시하였습니다.\n - 기본 architecture: Two-tower 모델과 같습니다.\n\n\n\n양쪽 방향이 같은 구조를 띄무로 한쪽 방향에 대해서만 표현하였습니다.\n| Entity-based | Feature-based |\n|--|--|\n| | |\n|각 entity의 intrinsic charateristic 을 배움 | heterogenous 한 두 entity 사이의 relationship을 배움 |\n\n다음의 두가지 모듈로 구성되있고, Sota 모델로 바꾸는게 쉽게 가능합니다.\n\n- Collaborative Filtering 모듈: graph embedding 방법을 사용합니다.\n- Content-based 모듈: contextual word representation 방법을 사용합니다.\n\n## Approach\n\n### Graph Embedding\n\n다음 두개의 모델 사용. (이 외에도 TransR, TransD, ... 많은 모델 존재. [survey paper](https://www.mdpi.com/2073-8994/13/3/485/htm) 참고.)\n\n- [TransE, NIPS'13](https://papers.nips.cc/paper/2013/hash/1cecc7a77928ca8133fa24680a88d2f9-Abstract.html)\n- [TransH, AAAI'14](https://ojs.aaai.org/index.php/AAAI/article/view/8870)\n\n이 모델은 본래 Knowledge graph 에서 entity(head)-relation-entity(tail)의 triple 정보를 임베딩에 반영하고자 한 방법. 추천시스템에서 유저, 아이템을 entity, 평점을 relation으로 생각 가능. 다음과 같은 관계로 임베딩.\n\n| - | TransE | TransH |\n| -------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |\n| Architecture | | |\n| Score function | $\\Vert \\textbf{h} + \\textbf{d}_r - \\textbf{t} \\Vert _{2}^2$ | $\\Vert \\textbf{h}_{\\bot} + \\textbf{d}*r - \\textbf{t}_{\\bot} \\Vert _{2}^2$ |\n\n> TransE 에서 \"동일 entity가 여러 relation에서 구분이 안된다\"는 단점을 TransH에서 hyperplane을 도입시킴으로써 해결.\n\n### Contextual Word Reprentation\n\nText 정보를 임베딩. 둘다 Transformer 기반의 모델. (자세한 설명 생략)\n\n- [BERT, NAACL'19](https://arxiv.org/abs/1810.04805)\n- [USE, ICLR'19](https://arxiv.org/abs/1804.07461)\n\n## Results\n\n### Dataset\n\n비교적 적은 데이터셋. 참고할 점은 train, test 셋을 나눌때, positive 비율을 train과 동일하게 나눔.\n\n\n### Protocol\n\n[TestRating](https://dl.acm.org/doi/10.1145/2043932.2043996) strategy 사용. 각 유저별로 테스트 셋에 있는 rating만 예측. ranking을 구할때는 예측한 평점들을 sorting하여 구함.\n\n\n> **비평:** 이 방법을 사용하면 topk 보다 test 아이템의 수가 적으면 무조껀 ranking안에 포함되고, 순서 맞추기 싸움이 됨. 기본적으로 ndcg가 높음.\n>\n> \n\n### Performance\n\n| error-based | ranking-based |\n| ------------------------------------------------------------ | ------------------------------------------------------------ |\n| ![image](https://user-images.githubusercontent.com/38134957/165453712-4c0144d4-9802-4c9b-8ac9-4bc9578647c4.png) | ![image](https://user-images.githubusercontent.com/38134957/165453719-41a29bbd-3260-446f-8d0d-df40f7293eaf.png) |\n| ![image](https://user-images.githubusercontent.com/38134957/165453712-4c0144d4-9802-4c9b-8ac9-4bc9578647c4.png) | ![image](https://user-images.githubusercontent.com/38134957/165454052-433ede9d-1b49-4a8f-bc79-51a69dfe878a.png) |\n\n- TransE 와 TransH의 우위는 domain 에 따라 다르다.\n- 논문 제목에서 강조하듯 Together is better. Collaborative 방법과 content방법의 시너지 효과.\n- concatenate 방법은 Feature based 방법이 더 효과적.\n\n[Open benchmark - Movielens 1M](https://paperswithcode.com/sota/collaborative-filtering-on-movielens-1m?metric=nDCG%4010)\n\n\n\n위의 오픈 벤치 마킹 정보에 의한 nDCG@10 Score와는 다른 test evaluation 프로토콜을 사용하였기 때문에 참고 부탁드립니다.\n\n## Conclusion\n\n- user, item 임베딩을 얻는 두가지 hybrid 방법(entity, feature-based)을 제시하였습니다.\n- 모델 architecture가 simple하여 sota 모델을 쉽게 적용 가능할 수 있고 성능도 우수합니다.\n\n### Weak points\n\n- CF 기반 모델에서 interaction 정보만 사용할 거면 굳이 graph model을 쓸 필요는 없을 것 같습니다. CF Sota를 넣어도 될 것 같습니다.\n\n> 저자는 이후에 knowledge graph정보를 추가로 넣어 볼 예정이라고하였는데 baseline으로 사용할 big picture?...\n>\n> attention 매커니즘도 적용해 볼 것이라고 했는데, 왜 안해봤을까.. 분명해봤는데 성능이 안좋은것이었을까?.. 하는 의문이 있었습니다.\n\n- Test protocol로 TestRating 기법을 사용했는데, 이 방법은 ranking 비교에는 좀 맞지 않은 설정입니다. 차라리 leave-one-out 을 사용하는게 좋을것 같습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Top-K Contextual Bandits with Equity of Exposure.md", "content": "# Top-K Contextual Bandits with Equity of Exposure\n\n- Paper : \n- Authors : Olivier Jeunen, Bart Goethals\n- Reviewer : charlie.cs\n- Topics\n - [#Algorithmic_Advances](../../topics/Algorithmic%20Advances.md)\n - [#Bandits_and_Reinforcement_Learning](../../topics/Bandits%20and%20Reinforcement%20Learning.md)\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- \"equity of exposure\" principle 이 어떻게 추천을 위한 top-K contextual bandit의 문제에 적용될 수 있는지 조사(investigate)한 논문입니다.\n - equity of exposure: 동일한 relevance를 가진 아이템들은 동일한 노출이 있을 것을 기대하게 됩니다.(_items of equal relevance should receive equal exposure in expectation_)\n- 기존 추천 시스템의 사용자 중심 utility(click or relevance)에 대한 최적화 방식은 시스템 내 다른 관계자(stakeholders)들에겐 악영향을 끼칠 수 있습니다.\n - 예시) 음악 스트리밍, 음식 배달, e-commerce, 그리고 viewtab\n- top-K contextual bandits 추천에서 relevance-fairness trade-off 문제를 다룰 수 있는 EARS (Exposure-Aware aRm Selection) 알고리즘을 제시하였습니다.\n - model-agnostic algorithm이라 기존 bandit system에 적용이 가능합니다.\n\n## Approach\n\n### Intuition\n\n- 사용자마다 추천 결과에 적용된 diversify의 반응이 다르며, 랜덤한 추천에 대해서 얼마나 열려(openness)있는지의 정도 또한 다양하다는 것을 관찰한 연구가 있습니다.\n - _Investigating Listeners’ Responses to Divergent Recommendations. R. Mehrotra, et al. RecSys' 20_\n- 이를 통해 단순히 모든 사용자에게 relevance-fairness의 trade-off 정도를 동일하게 적용하기 보다는 특정 유저 군에 한하여 적용하면 좋을 수 있습니다.\n - 예시) good choice for _diverse_ and _average_ users, but worse for _focused_ users.\n - ![image](https://s2.loli.net/2021/12/14/SAWGsy6zX3rC5aP.png)\n - x-axis: top-12 items for a given user.\n - y-axis: the probability of relevance over these items for that user.\n\n### Exposure-Aware aRm Selection (EARS)\n\n- 아이템이 클릭될 확률 `P(C)` 는 사용자가 이 아이템이 연관 있다고 고려할 확률 `P(R)`과 그 사용자에게 노출될 확률 `P(E)` 로 factorize될 수 있습니다.\n - \n- 그리고 fairness of exposure을 목적하는 알고리즘은 다음과 같은 두 조건부 확률 분포 간 statistical divergence, 즉 disparity를 최소화하는 것으로 볼 수 있습니다.: `D(P(A|R); P(A|C))`\n - 본 논문에서는 f-divergences로 Hellinger distance를 사용합니다.\n- EARS algorithm Figure\n - \n - Default bandit 알고리즘으로 logistic regression thompson sampling을 사용합니다.\n - _An Empirical Evaluation of Thompson Sampling. L. Li, et al. NIPS' 11_\n - EARS의 목적은 최대 ε 만큼의 expected clicks을 잃으면서 disparity를 최소화하는 것입니다.\n - Algorithm 4.(3)의 greedy policy에서 얻을 수 있는 추천 결과에 diversifying(shuffling)을 적용했을 경우(4.(4)의 equity policy), 최대 (1 - ε) * 100 % 만큼의 expected clicks 을 보존하는 선까지 disparity를 최소화합니다.\n - In experiments, `ε={0.01, 0.025, 0.05, 0.1}`\n - shuffle 방식은 random shuffling\n - 위에서 설명한 ε 조건을 만족할 수 있을 때까지 K값을 감소시키면서 shuffle을 진행합니다.\n - Why? 상위 추천 결과에서 shuffle을 진행해야 expected clicks 손해가 적고, 그에 따른 disparity 감소가 크기 때문입니다.\n\n## Results ([github](https://github.com/olivierjeunen/EARS-recsys-2021))\n\n- Real-world data from the Deezer music streaming platform\n - Relevance information between 862 playlists (items) and 974,960 users.\n - Users are represented by a dense 97d feature vector.\n - 추천 결과 수: top- `K`=12\n - 매 round 마다 사용자를 20,000명 복원 추출하여 추천 결과 제공하고, batch로 parameter를 업데이트합니다.\n\n- EARS algorithm에서 tolerance parameter ε 값을 조절해가며 실험하였습니다.: `{0.01, 0.025, 0.05, 0.1}`\n - baseline은 greedy approach\n- Carousel-기반의 추천 환경 (_Personalization in Music Streaming Apps with Contextual Bandits. W.Bendada. et al. Recsys' 20_)\n - \n - 사용자가 추천 결과를 보다가 중간에 포기할 확률 abandonment parameter `γ(=0.9)` 을 포함합니다.\n- EARS에서 사용할 Expected clicks 값 계산\n - Greedy approach\n - \n - Shuffling approach\n - greedy 와 동일하지만, 추천 결과를 K개까지 shuffling 한 모든 조합에 대해서 expected clicks을 일일이 구해야하므로 `O(K!)` 만큼의 비용이 소모됩니다.\n - 논문에서는 이를 효율적으로 계산하기 위한 방법을 제시했고, `O(K*2^(K-1)*(K-1))`까지 복잡도를 줄였다고 합니다.\n\n### 실험 결과\n\n![image](https://s2.loli.net/2021/12/14/X9FnyGpm5DLSN7T.png)\n\n- Figure 4(a): EARS’ Impact on Expected Reward\n - `ε=0.01`일 때 greedy 보다 성능이 좋았는데, 이에 대한 이유를 두 가지로 설명합니다.\n - (1) EARS의 rank 방식을 통해 positional bias를 완화하여 모델이 `P(R)` 대신 `P(C)`를 학습하게 됩니다.\n - (2) top-K list를 랜덤으로 섞으면서 매 라운드마다 배치로 학습할 데이터가 더욱 diverse 해집니다.\n- Figure 4(b): EARS’ Impact on Exposure Disparity\n - greedy 방식이 가장 큰 disparity를 보였고, ε이 증가할수록 조금씩 감소합니다.\n- Figure 4(c): EARS’ Relevance-Fairness Trade-Off\n - Rounds 20부터 수렴까지 4(a)와 4(b)의 measurement를 plot\n - expected clicks과 expected disparity의 linear한 관계를 확인할 수 있었습니다.\n - `ε=0.01`의 경우 greedy 방식에 비교했을 때, expected reward 증가와 disparity 감소를 보입니다.\n\n## Conclusion\n\n- 컨텐츠의 노출에 따라 수익이 발생하는 환경이면 이와 관련된 이슈가 있을 것 같다는 생각이 들었습니다.\n- 제안된 EARS 알고리즘은 cost가 높고, 단순 랜덤 셔플 방식이라 실제로 적용하기는 좋아보이지 않았습니다. (K 또한 낮았음)\n- 다만, 사용자에 따라 다양화가 적용되는 정도가 달라져야 한다는 insight를 얻을 수 있어서 좋았습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Toward Unified Metrics for Accuracy and Diversity for Recommender Systems.md", "content": "# Toward Unified Metrics for Accuracy and Diversity for Recommender Systems\n\n- Paper : \n- Authors : Javier Parapar, Filip Radlinski\n- Reviewer : iggy.ll\n- Topics\n - [#Metrics_and_Evaluation](../../topics/Metrics%20and%20Evaluation.md)\n - #Diversity\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n## Approach\n\n### 왜 다양성이 중요한가\n\n추천 시스템을 평가하는 방법은 대부분 Information Retrieval (IR)에서 가져왔다고 생각합니다. NDCG를 비롯한 랭킹 메트릭도 마찬가지인데, 추천 시스템에서 고민하던 요소는 대부분 IR에서 비슷하게 고민했던 것들이지만, 디테일한 부분에서 다른 점이 많이 발생합니다.\n\n### Diversity에 대한 대한 요구\n\n추천 시스템뿐만 아니라, IR에서도 다양성은 중요한 metric 중 하나인데, 이는 주로 Ambiguity 때문입니다. 검색 엔진이 \"재규어\"라는 입력을 받을 경우 자동차 브랜드와, 고양잇과 동물에 대한 문서를 모두 찾아주어야 하고, 이러한 Ambiguity가 추천 시스템에서는 유저의 취향에 대응됩니다.\n\n유저는 대체로 여러 취향을 가지고, 추천의 결과가 한 가지 종류의 아이템으로만 이루어져 있다면 추천이 불완전하다고 생각할 것입니다. 유저가 로맨스 영화와 호러 영화를 둘 다 좋아한다고 했을 때, 로맨스 영화만 추천하는 추천 모델은 불완전한 모델입니다.\n\n### Novelty에 대한 요구\n\n추천은 대부분 list 형태로 주어지며, 유저는 list를 좌에서 우로, 혹은 위에서 아래로 탐색하는 경우가 일반적입니다. $N$개의 추천 아이템이 주어진 경우, $k \\leq N$인 $k$을 유저가 클릭한 경우, 유저가 $1, \\dots, k-1$까지 보지 않았던 이유가 분명히 존재할 것이며, 이는 rank가 $k$ 미만인 아이템이 유저가 relevant하지 않았다고 판단했기 때문일 가능성이 높으며, $i_1, i_2, \\dots, i_{k-1}$는 서로 닮아 있을 가능성이 높습니다. 이를 대비해서, $k$번째 아이템은 이전의 아이템과 충분히 다른 아이템인 게 더 좋을 수도 있습니다. 즉, Novelty는 추천 시스템이 실패했을 때를 대비한 보험이라 생각할 수 있습니다.\n\nOTT 영화 추천을 예시로 들면, 유저가 로맨스를 좋아할 것이라 판단한 후에 로맨스 영화 5개를 추천했을 때, 추천이 성공적이었다 해도 유저는 랭크 상위의 영화 1-2개 정도밖에 보지 않을 것인데, 추천에 임의로 다른 영화를 한 두개 섞는다고 하면, 이 판단이 틀렸다고 하더라도 한 번의 기회를 더 얻을 수 있을 것입니다.\n\n### Diversity와 Novelty를 고려한 Metric $\\alpha\\beta$-nDCG\n\n#### Notation\n\n- $\\alpha_\\phi$: 토픽(취향이나 선호도, 이하 토픽이라 칭함)\n- 유저는 topic의 집합을 선호도로 갖고 있으며 $p(\\alpha_\\phi \\vert u)$는 유저가 그 토픽을 선호할 확률을 나타낸다.\n- 아이템 또한, topic의 집합을 갖고 있으며, 이 논문에서는 아이템의 토픽은 알려져 있다고 가정한다.\n\n특정 유저 $u$가 rank $S \\in \\{1, 2, \\dots, n\\}$에 있는 item $i$를 선호할 확률은\n\n$$\np(R=1 \\vert u, i) = 1 - \\prod_{\\phi} [1 - p(\\alpha_\\phi \\vert u, i) p(\\alpha_\\phi \\vert u, S)]\n$$\n\n로 정의된다.\n\n#### Diversity Consideration\n\n$p(\\alpha_\\phi \\vert u, i)$ (Diversity Term)는 Diversity를 고려한 식이다. 기존 ndcg에서 item 단위의 hit을 고려하는 것과는 별개로, topic 단위의 hit을 반영합니다.\n\n$p(\\alpha_\\phi \\vert u, i)$는 그 유저가 유저의 선호도 $\\alpha_\\phi$를 만족하는 정도를 나타내는데, 이를 별도로 정의하는 이유는 같은 장르이더라도, 유저가 특정 아이템을 선호할 수 있고 선호하지 않을 수 있기 때문입니다. 예를 들어서, *밴드 오브 브라더스*는 좋아하지만 *오! 인천*은 그다지 좋아하지 않는 경우가 있습니다.\n\n$$\np(\\alpha_\\phi \\vert u, i) = \\begin{cases}\n0 & \\text{아이템의 장르가 다름} \\\\\n\\alpha & \\text{유저가 그 장르를 좋아하는데, 유저가 클릭하지 않은 경우} \\\\\n\\beta & \\text{유저가 그 장르를 좋아하고, 유저가 그 아이템을 클릭한 경우} \\\\\n\\end{cases}\n$$\n\nDiversity Term은 유저가 그 아이템을 좋아하거나, 그 장르를 선호하거나에 따라 score에 대해 차등을 주는 식으로 모델링됩니다. 간단히 요약하자면, 기존 nDCG에서는 유저가 실제로 클릭한(relevant) 대해서만 추천을 준다고 가정하는 반면, 유저가 좋아하는 장르에 대한 추천에도 약간이나마 선호도를 부여합니다.\n\n$\\alpha, \\beta$에 대한 정의는 논문에서 자세히 되어있지 않지만, $p(\\alpha \\vert u), p(\\alpha \\vert i)$에 따라 적절히 정의될 수 있을 것 같습니다.\n\n### Novelty Consideration\n\n$p(\\alpha_\\phi \\vert u, S)$ (Novelty Term)는 유저가 특정 위치 $S\\in \\{1, 2, \\dots, n\\}$에 존재하는 추천에 대해 얼마나 만족하는지를 나타내는 지표입니다. 이를 별도로 모델링하는 이유는, 유저가 상위 랭크 $1, 2, \\dots, S-1$에서 특정 토픽 $\\alpha_\\phi$를 봤다면, rank $S$에서 같은 토픽 $\\alpha_\\phi$인 아이템을 보더라도 만족도가 그리 높지 않을 것이라는 가정을 포함하고 있습니다.\n\n$$\n p(\\alpha_\\phi \\vert u, S) = p(\\alpha_\\phi \\vert u) \\prod_{j = 1}^S [1-p(\\alpha_\\phi \\vert u, i_j)]\n$$\n\n유저가 이전에 본 항목에 같은 토픽의 아이템이 많이 들어있을 경우, Novelty Term은 감소한다. 새로운 토픽의 아이템이 추천될 경우, 이 값은 증가한다. 증가폭은 유저가 그 토픽을 선호할 확률 $p(\\alpha_\\phi \\vert u)$에 비례합니다.\n\n### Axioms for Diverse Ranking Evaluation\n\n논문에서 추천 리스트와, 그 추천 리스트에 대한 평가 메트릭에 관한 공리를 정의해놨는데, 논문에서 8가지 공리가 정의되어 있지만, 거칠게 요약하자면 다음과 같습니다.\n\n1. 두 아이템의 토픽이 완전히 같다고 가정하면, 유저는 relevancy가 더 높은 아이템이 추천되는 추천 리스트를 선호한다.\n2. 유저가 좋아하는 아이템이 추천 리스트에 포함될 경우, 이 아이템이 더 상위 랭크에 있는 추천 리스트가 더 하위 랭크에 있는 추천 리스트보다 선호된다.\n3. 한 추천 리스트에서 같은 토픽이 너무 자주 추천되는 경우, 이 토픽이 유저가 선호하는 토픽이라 할 지라도 유저가 좋아하지 않는 토픽의 아이템을 더 선호할 수 있다.\n4. 유저는 본 적 없는 아이템을, 이미 싫어하는 아이템보다 더 선호한다.\n\n## Conclusion\n\n- 구현 후, 오프라인 메트릭은 구현이 제대로 되어 있는 지만 확인 한 이후 온라인 평가가 실전이다 이런 느낌으로 온라인에 배포해던가, 혹은 IPS같은 방법으로 온라인 평가를 오프라인으로 가져오는 방법만 알고 있었는데, 유저 행동에 대한 합리적인 가정과 모델링을 통해 더 좋은 offline metric을 만드는 일도 좋은 방향일 수 있구나 하는 생각이 들었습니다.\n- Novelty가 중요하다는 얘기만 들었었는데, 그럴 듯 한 설명을 들은 것은 처음입니다.\n" }, { "path": "paper_review/recsys/recsys2021/Towards Source-Aligned Variational Models for Cross-Domain Recommendation.md", "content": "# Towards Source-Aligned Variational Models for Cross-Domain Recommendation\n\n- Paper : \n- Authors : Aghiles Salah, Thanh Binh Tran, Hady Lauw\n- Reviewer : andrew.y\n- Topics\n - [#Language_and_Knowledge](../../topics/Language%20and%20Knowledge.md)\n - #Cross-Domain\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- Cross Domain 추천이란?\n - 기존 data sparsity로 힘든 콜드 유저의 추천을 위해 다른 서비스에서 해당 유저의 소비 이력을 쓰는 추천입니다. (예. 유저의 영화 소비 이력으로 유저한테 책 추천)\n- 기존에 있던 방법은 아래와 같습니다.\n - matrix factorization jointly factorizes rating matrices from various domains with a shared user-latent space\n - transfer learning: a mapping between the source and target models or infer user representations that are domain-invariant\n- 이 논문에서 제안하는 방법은 다음과 같습니다.\n - Variational AutoEncoder (VAE)를 사용하는 기법\n - VAE를 source domain에서 학습 시켜서 target domain에 preference modeling을 한다.\n\n## Approach\n\n### VAE?\n\n- [참고 링크](https://towardsdatascience.com/understanding-variational-autoencoders-vaes-f70510919f73#:~:text=In%20a%20nutshell%2C%20a%20VAE,to%20generate%20some%20new%20data.)\n\n![image](https://user-images.githubusercontent.com/38134957/165147766-409ac332-6425-456d-bb3c-c002d8ce3ba5.png)\n![image](https://user-images.githubusercontent.com/38134957/165147773-912b06b2-8965-4a77-8409-c019279351cd.png)\n![image](https://user-images.githubusercontent.com/38134957/165147781-c526bc79-2acb-4a98-97f4-bb862f654f36.png)\n\n### Why VAE?\n\n- Matrix Factorization의 limitation인 linear nature가 아닌 non-linear recommendation 모델을 써보기 위해 VAE를 사용할 수 있습니다.\n - non-linear recommendation 모델은 sparse data에 overfitting 하기 쉬운 문제는 있습니다.\n- VAE가 다른 논문들에서 성능이 좋은 측면도 있습니다.\n\n### Source Domain\n\n- VAE의 디코더랑 상응하는 부분 (theta 학습)\n\n\n- VAE의 인코더랑 상응하는 부분 (phi 학습)\n\n\n- Evidence Lower BOund (ELBO) -> maximize:\n\n\n- a given input x, we want to maximise the probability to have x̂ = x when we sample z from the distribution q*_x(z) and then sample x̂ from the distribution p(x|z)\n\n- KL divergence: staying close to the prior distribution ( )\n\n### Target Domain\n\n- Rigidly Aligned VAE (RA-VAE):\n\n - source domain data held fixed while training target domain data\n\n- Softly Aligned VAE (SA-VAE):\n\n\n\n\n\n### 논문에서 쓰는 모델들 (baseline 포함)\n\n![image](https://user-images.githubusercontent.com/38134957/165148112-f73f3f06-1b36-435c-b184-e7487a715429.png)\n\n## Results\n\n- Amazon, Douban 데이터셋에서 실험하였습니다.\n- 오프라인 실험: 10%, 20%, 30% 랜덤하게 테스트 셋으로 ndcg, recall 계산 (target domain에서 콜드 유저로 인식)\n![image](https://user-images.githubusercontent.com/38134957/165148128-b304551b-8736-48e7-a162-c3cba55b6e91.png)\n![image](https://user-images.githubusercontent.com/38134957/165148172-dae9a356-7f06-48d5-a120-0d340e990e05.png)\n![image](https://user-images.githubusercontent.com/38134957/165148184-f53e89ab-c1d1-48b2-84d9-7f01bda0904e.png)\n\ntldr; RA-VAE, SA-VAE가 베이스라인보다 더 성능이 좋음. baseline에서는 EMCDR이 제일 성능이 좋음.\n\n### 모델의 성능이 유저 활동성에 따라 달라지나? (robustness of the model)\n\n테스트 셋은 10%으로.\n\n![image](https://user-images.githubusercontent.com/38134957/165148349-b9041eb3-ad24-4cf1-b6c3-496c4c10c397.png)\n\ntldr; 모든 그룹에 성능 좋아지고, 30회 이하 유저 그룹들에 베이스라인보다 더 성능이 좋아졌다 한다.\n\n## Conclusion\n\n- VAE 기반 cross-domain 추천을 할때 모델을 어떻게 짜는지가 중요한걸 볼수 있다. (e.g. 모델 architecture에서 sparsity issue를 줄인다던지)\n- 기존에 쓰인 deterministic methods과 달리 VAE를 쓴 probabilistic approach도 cross-domain 추천에 잘 쓰일수 있다.\n" }, { "path": "paper_review/recsys/recsys2021/Transformers4Rec- Bridging the Gap between NLP and Sequential & Session-Based Recommendation.md", "content": "# Transformers4Rec- Bridging the Gap between NLP and Sequential & Session-Based Recommendation\n\n- Paper : \n- Authors : Gabriel de Souza Pereira Moreira, Sara Rabhi, Jeong Min Lee, Ronay Ak, Even Oldridge\n- Reviewer : marv.20\n- Topics\n - [#Language_and_Knowledge](../../topics/Language%20and%20Knowledge.md)\n - #Semi-Supervised_Learning\n - #Sequential_Recommendation\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- NLP와 sequential / session 기반 추천 방식이 유사한데, 최근 NLP의 수많은 모델 구조들을 바로 추천에 적용할 수 있게끔 huggingface transformers 라이브러리 기반의 transformer4rec 라이브러리를 공개하였습니다. Huggingface의 모델 구조를 적용, 튜닝하는 것으로 2개의 2021 이커머스 챌린지에서 우승할 수 있었습니다.\n- casual language modeling에서 자주 쓰였던 학습방법들인 masked LM, permutation LM, replacement token detection 방법론들을 비교하여 보았습니다.\n- 사이드 정보를 결합하여 추천해보았습니다.\n\n## Approach\n\n### NLP 모델들과 Sequential / Session 기반 추천의 관계\n\n![image](https://user-images.githubusercontent.com/38134957/165446726-6ebf29d3-91c8-4ddd-a968-8e2dfcb8ff36.png)\n\n### LM 학습기법들 비교 (CLM, MLM, PLM, RTD)\n\n![The possible transformation of MLM and PLM, where w i and p i represent token and position embeddings. [M ] is the special mask token used in MLM. The left side of MLM (a) can be seen as bidirectional AR streams (in blue and yellow, respectively) at the right side. For MLM (b) and PLM (c), the left sides are in original order, and the right sides are in permuted order, which are regarded as a unified view.](https://www.researchgate.net/profile/Rui-Wang-17/publication/341369190/figure/fig4/AS:890933465849856@1589426499052/The-possible-transformation-of-MLM-and-PLM-where-w-i-and-p-i-represent-token-and.png)\n\n- causal language model (CLM) : next token prediction\n- masked language model (MLM) : masked token prediction\n- permuation languagem model (PLM) : permutation + next token prediction\n\n### Transformer4Rec 구조\n\n![image](https://user-images.githubusercontent.com/38134957/165446737-bfbd5f4a-619f-46f8-9753-ab0f1c925eb5.png)\n\n- 데이터 전처리, 피처 엔지니어링 : NVTabular\n - sequential reco를 위한 ops : grouping time-sorted interactions, truncating first/last N interactions\n- Meta architecture\n - feature processing module : sparse categorical, continuous -> normalized and combined\n - sequence masking module : CLM, MLM, PLM\n - prediction head module : tasks (item prediction, sequence-level prediction)\n\n## Results\n\n- RQ1. 다양한 모델 아키텍쳐 실험 결과\n- RQ2. 다양한 학습 방식 실험 결과\n- RQ3. item embedding을 다양한 feature들의 결합으로 변형\n\n![image](https://user-images.githubusercontent.com/38134957/165446761-2f16c809-ea69-44a5-9169-e6570ba8c84d.png)\n\n## Conclusion\n\n- sequential recommendation이 NLP의 발전을 따라가기만 하는 형태여서 비판적이었는데 이를 실용적으로 풀어낸 게 인상깊었습니다.\n- winning solution은 존재하지 않았습니다. 오히려 그렇기 때문에 데이터셋이나 환경에 따라 다양한 모델을 자유롭게 실험해볼 수 있어야 하고, 그런 의미에서 이 논문의 가치가 있다고 생각합니다.\n- 사이드 정보를 넣는 방식이 인상 깊었습니다. 상당히 간단해서 어느 구좌 / 메타이던지 사용해볼 수 있을 것 같습니다.\n" }, { "path": "paper_review/recsys/recsys2021/Values of Exploration in Recommender Systems.md", "content": "# Values of Exploration in Recommender Systems\n\n- Paper : \n- Authors : Minmin Chen, Yuyan Wang, Can Xu, Ya Le, Mohit Sharma, Lee Richardson, Su-Lin Wu, Ed Chi\n- Reviewer : andrew.y\n- Topics\n - [#Metrics_and_Evaluation](../../topics/Metrics%20and%20Evaluation.md)\n - [#RecSys2021](RecSys2021.md)\n\n## Summary\n\n- 강화학습 기반 추천 시스템에서 exploration이 어떤 영향을 미치는지 알아보고 user exploration을 추가하는 methodology를 소개한 논문입니다.\n- Accuracy, diversity, novelty, serendipity를 측정하고, 오프라인과 온라인 실험을 통해 exploration의 영향을 분석하였습니다.\n\n## Approach\n\n### 배경\n\n논문은 REINFORCE 추천 시스템을 베이스로 사용합니다. ([참고 논문](https://arxiv.org/abs/1812.02353))\n\n- 용어 정리\n \n - 유저의 히스토리 up to time t, A_t = set of item recommended at time t, a = item user interacted with, r = reward\n - u_s_t = RNN_theta(H_t) → latent user state (s_t = user state)\n - v_a = embedding of item a\n- Softmax Policy over item corpus given the latent user state\n \n - 여기서 policy parameters θ가 밑의 수식을 (expected culumative reward) 최대화 하게 학습을 합니다.\n \n \n - 이 학습된 softmax policy를 사용해서 time t에 set of recommendation A_t생성해서 A_t를 유저한테 추천합니다.\n\n### User Exploration 활성화 하는 방법\n\n#### Entropy Regularization\n\npolicy π_θ (·|s)를 entropy가 높은 output distribution으로 유도해서 유저 관심사 밖 콘텐츠를 추천하는걸 더 활성화 시킵니다. (user exploration 활성화)\n\n\n\n- entropy는 negative reverse KL divergence of the conditional distribution π_θ (·|s) to the uniform distribution. (uniform distribution과 얼마나 비슷한지)\n- entropy를 높이면 높일수록 학습된 policy는 uniform distribution이 된다. (선호도와 상관 없이 공평하게 추천된다)\n\n#### Intrinsic Motivation and Reward Shaping\n\n\n\n\n- 위 policy 수식의 r(s,a) reward function (유저 s에게 a를 추천하는 immediate value)에서 intrinsic reward를 추가합니다.\n- 유저가 소비한 아이템의 리스트가 있을때 유저가 막 소비한 아이템이 이전 아이템들이랑 많이 다르면 reward를 높게 합니다.\n- multiplication인 이유는 relevance를 유지하기 위해서 (R_t^e (s_t , a_t ) = 0는 계속 0)입니다.\n- 유저에게 더 좋은 user experience를 주는 surprising한 (과거 소비 아이템이랑 다른) 아이템에게 reward를 많이 줍니다.\n- unknown interest는 아이템의 클러스터가 유저가 이미 소비한 클러스터가 아닌 경우를 의미합니다. (i.e. different topic, different provider)\n\n#### Actionable Representation for Exploration\n\n- 유저가 surprising한 아이템을 소비해서 리워드를 높게 받은 상태면, 다음에는 다르게 interact할수있게 유저 피쳐에 반영을 해야합니다.\n- 따라서 유저 피쳐 (유저 히스토리)에 surprise랑 relevance를 추가합니다.\n , i_t = 1 if topic/provider cluster different, r_t (reward) > 0 (relevance)\n\n### 측정 방법\n\n#### Accuracy\n\n- mean average precision at K = 50 (밑의 수식에서는 j) ([참고 논문](https://www.cs.cornell.edu/people/tj/publications/yue_etal_07a.pdf))\n\n\n#### Diversity\n\n\n\n- 직관적인 수식입니다. uniform에서는 sim(i,j)는 1이니까 diversity는 0, sim(i,j)가 낮으면 낮을수록 diversity가 올라가게 됩니다.\n\n#### Novelty\n\n\n\n- I(a)= − log (# users consumed item a) + const\n- globally 덜 popular 한 아이템 (모두가 좋아하지 않는 아이템)을 학습해서 추천하면 더 novel하다고 봅니다.\n\n#### Serendipity\n\n\n\n\n- 위에 언급한 surprise + relevance를 둘다 챙기면 1, 아니면 0로 둡니다.\n- 유저가 소비하는 주류 아이템이 아닌 관심있는 아이템이 있는지 quanitify 하는 metric입니다.\n\n#### Long Term User Experience\n\n- 결국엔 exploration이 long term user experience에는 도움이 될것인지 알려면 이거에 대한 측정 방법도 있어야 합니다.\n- 논문에서는 유저가 다시 서비스를 쓰는지, 그리고 활동량이 적은 유저들이 활동량이 많은 유저로 변하는지를 보고 long term user experience를 판단합니다.\n\n## Results\n\n### 오프라인 실험 결과 및 분석\n\n![image](https://user-images.githubusercontent.com/38134957/165145163-284be0f7-1b83-4371-9668-5c86004ab50a.png)\n\n- 무슨 데이터셋을 썼는지 정확히 언급은 하고 있지 않습니다. (\"a billion user trajectories from a commercial recommendation platform\")\n- item space = most popular 10 million items in the past 48 hours on the platform\n- 99% training, 1% validation\n\n#### Entropy Regularization\n\n- as α ↑, diversity ↑, novelty ↑ at cost of accuracy ↓ + serendipity ↓ (due to loss of relevance)\n\n#### Intrinsic Motivation\n\n- 위의 c를 조정 가능하지만 이 페이퍼에서는 | I_t | 를 조정하기로 하였습니다.\n- baseline 대비 diversity ↑ at cost of accuracy ↓, serendipity ↑, novelty - 의 성능을 보여주었습니다.\n- d = 1, 7, 365에서는 큰 차이 없었습니다.\n- In the datasets, the percentage is reduced from 36% → 19% → 12% when the window size is extended from 1 → 7 → 365 days. (서프라이징 한 state-action pair %)\n\n#### Actionable Representation\n\n- actionable representation만으로는 baseline과 비슷해서 intrinsic motivation이랑 같이 써야합니다.\n- intrinsic motivation 대비 serendipity ↑\n- mean input gate activation value차이 → RNN이 surprising event때 더 큰 업데이트를 합니다. → 유의미한 차이가 있습니다.\n\n\n\n### 온라인 실험 결과 및 분석\n\n- 오프라인 실험과 데이터 크기는 비슷합니다.\n - \"a industrial recommendation platform serving billions of users\", \"a corpus of 10 million\"\n![image](https://user-images.githubusercontent.com/38134957/165145338-547f5d84-66fc-4269-a0ee-f578160d2662.png)\n - entropy regularization (red: α = 0.1, blue: α = 0.5)\n - intrinsic motivation (d = 7, topic, c = 4)\n - user enjoyment improvement 어떻게 측정 했는지 안나와있습니다.\n - α = 0.1 → α = 0.5: lower user enjoyment improvement. 따라서 diversity ↑ novelty ↑은 better user experience를 가져오지 못한다고 볼 수 있습니다.\n- Figure 3b, 3c에서는 user enjoyment이 improve했고 (baseline 대비) 오프라인 분석과 합쳐서 분석하면 serendipity ↑ 이 user experience를 더 좋게 만든다고 볼 수 있습니다.\n \n- Returning 유저도 더 많아졌습니다.\n\n#### Long Term User Experience\n\n![image](https://user-images.githubusercontent.com/38134957/165145476-f81882da-c0b4-4e45-b800-d63528785fbd.png)\n\n- 시간이 지날수록 exploration의 효과 (유저가 새로운 \"interest\"를 찾는거)가 있었습니다.\n\n![image](https://user-images.githubusercontent.com/38134957/165145485-994383d3-1a05-4d21-973e-001397e57b2e.png)\n\n- 실험 시작하기 전과 후를 비교한 a user activity level transition matrix입니다.\n- 저 %가 어떻게 계산되는지는 불확실합니다. (개인적으로 이해 못함)\n- casual → core conversion이 많았다 주장하고 있습니다.\n\n## Conclusion\n\n- serendipity가 long term user experience에 좋은 영향을 준다는 것을 밝혔습니다. 따라서 long term user experience를 높히기 위해서는 exploration을 해야하고, exploration이 serendipitous recommendation을 잘 해줘야 합니다.\n" }, { "path": "paper_review/topics/Algorithmic Advances.md", "content": "# Algorithmic Advances\n\n- [Next-item Recommendations in Short Sessions](../recsys/recsys2021/Next-item%20Recommendations%20in%20Short%20Sessions.md)\n- [Burst-induced Multi-Armed Bandit for Learning Recommendation](../recsys/recsys2021/Burst-induced%20Multi-Armed%20Bandit%20for%20Learning%20Recommendation.md)\n- [Top-K Contextual Bandits with Equity of Exposure](../recsys/recsys2021/Top-K%20Contextual%20Bandits%20with%20Equity%20of%20Exposure.md)\n" }, { "path": "paper_review/topics/Applications-Driven Advances.md", "content": "# Applications-Driven Advances\n\n- [Follow the guides- disentangling human and algorithmic curation in online music consumption](../recsys/recsys2021/Follow%20the%20guides-%20disentangling%20human%20and%20algorithmic%20curation%20in%20online%20music%20consumption.md)\n" }, { "path": "paper_review/topics/Bandits and Reinforcement Learning.md", "content": "# Bandits and Reinforcement Learning\n\n- [Burst-induced Multi-Armed Bandit for Learning Recommendation](../recsys/recsys2021/Burst-induced%20Multi-Armed%20Bandit%20for%20Learning%20Recommendation.md)\n- [Top-K Contextual Bandits with Equity of Exposure](../recsys/recsys2021/Top-K%20Contextual%20Bandits%20with%20Equity%20of%20Exposure.md)\n" }, { "path": "paper_review/topics/Echo Chambers and Filter Bubbles.md", "content": "# Echo Chambers and Filter Bubbles\n\n- [I want to break free! Recommending friends from outside the echo chamber](../recsys/recsys2021/I%20want%20to%20break%20free!%20Recommending%20friends%20from%20outside%20the%20echo%20chamber.md)\n" }, { "path": "paper_review/topics/Interactive Recommendation.md", "content": "# Interactive Recommendation\n\n- [The role of preference consistency, defaults and musical expertise in users’ exploration behavior in a genre exploration recommender](../recsys/recsys2021/The%20role%20of%20preference%20consistency,%20defaults%20and%20musical%20expertise%20in%20users’%20exploration%20behavior%20in%20a%20genre%20exploration%20recommender.md)\n" }, { "path": "paper_review/topics/Language and Knowledge.md", "content": "# Language and Knowledge\n\n- [Transformers4Rec- Bridging the Gap between NLP and Sequential & Session-Based Recommendation](../recsys/recsys2021/Transformers4Rec-%20Bridging%20the%20Gap%20between%20NLP%20and%20Sequential%20&%20Session-Based%20Recommendation.md)\n- [Sparse Feature Factorization for Recommender Systems with Knowledge Graphs](../recsys/recsys2021/Sparse%20Feature%20Factorization%20for%20Recommender%20Systems%20with%20Knowledge%20Graphs.md)\n- [ProtoCF- Prototypical Collaborative Filtering for Few-shot Item Recommendation](../recsys/recsys2021/ProtoCF-%20Prototypical%20Collaborative%20Filtering%20for%20Few-shot%20Item%20Recommendation.md)\n- [Towards Source-Aligned Variational Models for Cross-Domain Recommendation](../recsys/recsys2021/Towards%20Source-Aligned%20Variational%20Models%20for%20Cross-Domain%20Recommendation.md)\n- [Together is Better- Hybrid Recommendations Combining Graph Embeddings and Contextualized Word Representations](../recsys/recsys2021/Together%20is%20Better-%20Hybrid%20Recommendations%20Combining%20Graph%20Embeddings%20and%20Contextualized%20Word%20Representations.md)\n" }, { "path": "paper_review/topics/Metrics and Evaluation.md", "content": "# Metrics and Evaluation\n\n- [Toward Unified Metrics for Accuracy and Diversity for Recommender Systems](../recsys/recsys2021/Toward%20Unified%20Metrics%20for%20Accuracy%20and%20Diversity%20for%20Recommender%20Systems.md)\n- [Values of Exploration in Recommender Systems](../recsys/recsys2021/Values%20of%20Exploration%20in%20Recommender%20Systems.md)\n- [Accordion- a Trainable Simulator for Long-Term Interactive Systems](../recsys/recsys2021/Accordion-%20a%20Trainable%20Simulator%20for%20Long-Term%20Interactive%20Systems.md)\n- [Evaluating Off-Policy Evaluation- Sensitivity and Robustness](../recsys/recsys2021/Evaluating%20Off-Policy%20Evaluation-%20Sensitivity%20and%20Robustness.md)\n" }, { "path": "paper_review/topics/Practical Issues.md", "content": "# Practical Issues\n\n- [Shared Neural Item Representation for Completely Cold Start Problem](../recsys/recsys2021/Shared%20Neural%20Item%20Representation%20for%20Completely%20Cold%20Start%20Problem.md)\n" }, { "path": "paper_review/topics/Privacy, Fairness, Bias.md", "content": "# Privacy, Fairness, Bias\n\n- [Debiased Explainable Pairwise Ranking from Implicit Feedback](../recsys/recsys2021/Debiased%20Explainable%20Pairwise%20Ranking%20from%20Implicit%20Feedback.md)\n- [Mitigating Confounding Bias in Recommendation via Information Bottleneck](../recsys/recsys2021/Mitigating%20Confounding%20Bias%20in%20Recommendation%20via%20Information%20Bottleneck.md)\n" }, { "path": "paper_review/topics/Real-World Concerns.md", "content": "# Real-World Concerns\n\n- [Cold Start Similar Artists Ranking with Gravity-Inspired Graph Autoencoders](../recsys/recsys2021/Cold%20Start%20Similar%20Artists%20Ranking%20with%20Gravity-Inspired%20Graph%20Autoencoders.md)\n- [Semi-Supervised Visual Representation Learning for Fashion Compatibility](../recsys/recsys2021/Semi-Supervised%20Visual%20Representation%20Learning%20for%20Fashion%20Compatibility.md)\n" }, { "path": "paper_review/topics/Scalable Performance.md", "content": "# Scalable Performance\n\n- [Local Factor Models for Large-Scale Inductive Recommendation](../recsys/recsys2021/Local%20Factor%20Models%20for%20Large-Scale%20Inductive%20Recommendation.md)\n- [Reverse Maximum Inner Product Search- How to efficiently find users who would like to buy my item?](../recsys/recsys2021/Reverse%20Maximum%20Inner%20Product%20Search-%20How%20to%20efficiently%20find%20users%20who%20would%20like%20to%20buy%20my%20item%3F.md)\n" }, { "path": "paper_review/topics/Theory and Practice.md", "content": "# Theory and Practice\n\n- [Negative Interactions for Improved Collaborative Filtering- Don’t go Deeper, go Higher](../recsys/recsys2021/Negative%20Interactions%20for%20Improved%20Collaborative%20Filtering-%20Don’t%20go%20Deeper,%20go%20Higher.md)\n- [Matrix Factorization for Collaborative Filtering Is Just Solving an Adjoint Latent Dirichlet Allocation Model After All](../recsys/recsys2021/Matrix%20Factorization%20for%20Collaborative%20Filtering%20Is%20Just%20Solving%20an%20Adjoint%20Latent%20Dirichlet%20Allocation%20Model%20After%20All.md)\n" }, { "path": "paper_review/topics/Users in Focus.md", "content": "# Users in Focus\n\n- [\"Serving Each User\"- Supporting Different Eating Goals Through a Multi-List Recommender Interface](../recsys/recsys2021/\"Serving%20Each%20User\"-%20Supporting%20Different%20Eating%20Goals%20Through%20a%20Multi-List%20Recommender%20Interface.md)\n" }, { "path": "presentations/README.md", "content": "# 발표 자료 모음\n" }, { "path": "programming_assignments/beale_ciphers/README.md", "content": "# 빌 암호(Beale Ciphers) 해독\n\n문제 출제 및 검수: 한상덕(leo.han)\n\n> 이 문제로 영입을 진행하며 지원자분에게 드렸던 인터뷰 질문은 [interview.md](interview.md)에 있습니다. 문제를 풀어보시고 이 문서도 확인해보세요.\n\n## 문제\n\n사건은 1885년 한 조그마난 팜플렛이 버지니아에서 발견되면서부터 시작된다. 이 팜플렛에는 빌이라는 이름의 한 남자의 이야기와 세 개의 암호 메세지가 담겨있었다. \n이야기의 내용은 1820년 빌이라는 남자가 버지니아 베드포드 카운티 한 비밀의 장소에 보물로 가득 찬 수레 두 대를 묻었다는 것이다.\n\n이 남자는 여관 주인에게 작은 열쇠 상자를 맡기고 마을을 떠난 뒤 다시는 나타나지 않았다. 수 년 뒤 여관 주인은 열쇠 상자를 열었고 세 개의 암호화된 메세지를 발견한다. \n그는 평생 암호를 해독하지 못하고 1863년 죽기 전에 친구에게 암호를 준다. 그로부터 20년 후 이 이름 모를 친구는 세 개의 암호 중 첫 번째와 두 번째 암호를 해독하는데 성공한다. \n해독된 메세지에는 빌이 묻은 금은보화들의 존재와 위치가 담겨있었다. 마지막 메세지에는 세부 위치와 그 보물들이 누구의 소유인지 밝혀져 있다고 한다. \n수십 년간 많은 사람이 암호 해독을 시도해보았고 보물을 찾아 나섰지만 모두 실패했다.\n\n![빌의 두번째 암호](https://user-images.githubusercontent.com/38134957/205591146-88a80e11-1dee-4d33-8305-40ef6f13d6f1.png) \n빌의 두번째 암호\n\n![빌의 세번째 암호](https://user-images.githubusercontent.com/38134957/205591160-5b7a7fa5-964f-443b-a5bf-01d9dd093420.png) \n빌의 세번째 암호\n\n그러던 중 카카오 추천팀 레오는 빌의 다른 암호문 중에서 세 번째 암호를 해결하기 위한 단서가 첫 번째 암호와 두 번째 암호에 존재한다는 사실을 발견했다. \n첫 번째 암호문을 행렬로 표현했을 때 k x k 크기의 정방 블록부분행렬들 중 한 블록부분행렬 X와 X와 같은 크기의 두 번째 암호의 블록부분행렬들 중 한 블록부분행렬 Y가 세 번째 암호를 해독하는데 중요한 역할을 한다는 사실을 발견한 것이다.\n\n레오는 세 번째 암호문의 k x k 크기의 블록부분행렬 집합 Q의 원소 중 의미있는 원소의 집합 S를 다음과 같이 표현하였다.\n\n$$\\large S = \\\\{ Z | XZ = Y, Z \\in Q \\\\}$$\n\n레오는 집합 S의 크기가 클수록 암호를 해독할 가능성이 높아진다고 생각하였지만 모든 경우를 전부 해보는 것은 시간상 힘들기 때문에 X, Y 그리고 세 번째 암호문 n×m 행렬 R이 주어졌을 때 |S|를 구하는 프로그램을 구현하고자 한다.\n\n## 조건\n\n1. 입력제한\n - C++, Java : 1 ≤ k ≤ 100, k ≤ n, m ≤ 150\n - Python : 1 ≤ k ≤ 40, k ≤ n, m ≤ 60\n2. k×k의 두 행렬의 곱 연산은 일반적인 방법으로 O(k^3)에 구현이 가능하고 가장 빠른 방법은 O(k^2.373)에 구하는 방법으로 알려져 있다. \n 하지만 위 두 가지 방법론으로 위 문제를 해결하기에는 적절하지 않기 때문에 다음 방법론을 이용하여 구현해야 한다.\n - 링크: \n3. Standard Library만 사용해야 한다. (ex Python 2, Python 3 - numpy 모듈 허용하지 않음)\n4. 제한시간 C++ 1.5초, Java 2.5초, Python 5초\n5. 표준 입출력 사용\n6. matrix 연산 과정은 int 범위 안에서 계산할 수 있습니다.\n\n## 입력\n\n첫 번째 줄에 테스트 케이스 T(1 ≤ T ≤ 10)가 입력으로 주어진다. 두 번째 줄부터 테스트케이스가 시작된다. \n각 테스트 케이스의 첫 번째 줄에 공백을 기준으로 n, m, k가 주어진다. 그 다음줄부터 k개의 줄에는 X의 원소가 k개씩 주어진다. \n이어서 k개의 줄에는 Y의 원소가 k개씩 주어지고 그 다음에 n개의 줄에 R의 원소가 m개씩 주어진다.\n\n## 출력\n\n각 테스트케이스마다 |S| 를 한 줄에 하나씩 출력한다.\n\n## 예제\n\n|입력 예제|출력 예제|\n|:---|:---|\n|2
1 4 1
2
6
3 4 3 3
3 4 2
1 0
0 1
1 1
0 1
1 1 1 1
0 1 0 1
1 3 1 -1|3
2











|\n" }, { "path": "programming_assignments/beale_ciphers/interview.md", "content": "# 빌 암호(Beale Ciphers) 해독 인터뷰 질문\n\n> [▶︎ 빌 암호(Beale Ciphers) 해독 문제로 돌아가기](README.md)\n\n빌 암호(Beale Ciphers) 해독 문제로 영입을 진행하며 지원자분에게 드렸던 인터뷰 질문과 예시 답변을 모아놓았습니다.\n\n## 질문 1\n\nFreivalds 알고리즘의 목적 및 동작에 대해 설명해주세요.\n\n
\n예시 답변\n\n- N x N 행렬 A, B, C에 대해서, AB = C 인지 여부를 빠르게 계산하기 위한 확률 기반 approximate 알고리즘\n\n
\n\n## 질문 2\n\n빌 암호 해독 문제를 freivalds 알고리즘을 이용하여 해결 했을 경우 시간 복잡도는? 그리고 시간복잡도 그렇게 되는 이유(증명)를 설명할 수 있겠는가?\n\n
\n예시 답변\n\n- O(kN^2), k는 frealids 알고리즘 반복 횟수\n - 간혹 kN^2 이 아니라 반복횟수 k를 상수 취급해서 무시하는 경우가 있는데, 정확하게 집고 넘어가도록 하자.\n - 문제를 풀 때 증명을 읽지 않고 문제를 해결할 수 있기 때문에 증명 내용에 대해서는 추가 점수 정도로 조정\n\n
\n\n## 질문 3\n\nFreivalds 알고리즘의 오답률은?\n\n
\n예시 답변\n\n ≤ 1/(2^k)\n
\n\n## 질문 4\n\nFreivalds 알고리즘 반복 횟수 k는 문제에서 몇 번 시도하였는가? 왜 그렇게 값을 정하였는가?\n만약 K 값을 더 최적화해보라고 한다면, 어떻게 접근하겠는가? 필요한 가정은 직접 추가해도 무방하다.\n\n
\n예시 답변\n\n- 시스템이 요구하는 정확도가 xx 라면 xx 를 초과하도록 k 를 정하겠다.\n- 시스템의 수행시간이 허용하는 한도 내에서 가장 높은 k 를 실험적으로 찾겠다.\n - 정확도와 수행시간 간에 트레이드오프임을 인지하는지 판단\n\n
\n" }, { "path": "programming_assignments/beale_ciphers/solution/solve.cpp", "content": "#include \n#include \n#include \n\nconst int K = 102;\nconst int N = 302;\nconst int M = 302;\n\nint X[K][K], Y[K][K], Q[N][M], _C[K][K];\nint v[K], t[K], q[K];\n\n\nbool freivald(int X[][K], int Y[][K], int Q[][M], int x, int y, int n, int m, int k){\n int T = 10;\n while(T--){\n for(int i=0; i 0 ) {\n for(int i=0; i 10:\n break\n count = count + 1\n return True\n\n\ndef solve():\n n, m, k = map(int, input().split())\n X = []\n Y = []\n Q = []\n v = [0 for i in range(k)]\n t = [0 for i in range(k)]\n q = [0 for i in range(k)]\n\n for i in range(k):\n X.append(map(int, input().split()))\n for i in range(k):\n Y.append(map(int, input().split()))\n for i in range(n):\n Q.append(map(int, input().split()))\n\n ans = 0\n for i in range(n - k + 1):\n for j in range(m - k + 1):\n if freivald(X, Y, Q, i, j, n, m, k, v, t, q):\n ans = ans + 1\n print(ans)\n\n\ndef test():\n T = map(int, input().split())[0]\n for i in range(T):\n solve()\n\n\nif __name__ == '__main__':\n test()\n" }, { "path": "programming_assignments/beale_ciphers/testcase/README.md", "content": "# 테스트 케이스\n\n- Python2, Python3의 경우 small test case까지만 채점\n- C++, Java의 경우 small + large test case로 채점\n" }, { "path": "programming_assignments/beale_ciphers/testcase/large/test1.in", "content": "1\n150 150 100\n1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0\n0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0\n0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0\n0 0 0 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232 230 -99 -97 -110 151 61 335 94 71 55 -199 -262 -406 7 277 12 -63 -46 -190 -360 -169 -128 34 -150 -330 -186 222 -295 150\n95 140 155 -14 187 2 -216 82 67 145 239 383 8 398 -191 473 -481 99 331 -146 60 -162 169 -331 219 92 114 351 284 -232 -44 382 413 -52 47 -189 -123 91 197 16\n181 -154 289 196 179 -72 454 -9 -489 224 111 -91 188 -380 48 250 249 66 292 -230 -76 -360 -319 -178 298 -109 382 -46 -13 228 285 182 157 -2 335 -209 57 -164 84 321\n-482 -70 -223 -4 -533 -72 135 -21 -238 -23 -43 -506 231 -430 221 91 -17 -252 -348 -75 166 48 -141 -152 -317 70 179 201 -65 144 -150 -159 48 -30 386 193 -38 -50 470 -189\n-135 -16 181 -305 -291 -11 46 7 -127 13 60 186 -172 3 -356 88 279 124 -33 -273 285 -358 14 -149 -111 56 67 133 -122 -361 -131 161 39 -124 -1 -72 -305 -182 176 -91\n20 111 89 -117 110 148 -265 -384 111 134 -112 -39 284 -166 -246 339 239 -238 -168 -94 174 59 94 280 68 24 -59 230 10 199 288 -320 -30 63 64 -57 136 137 185 240\n494 76 -376 38 155 394 184 -490 -80 -193 -126 52 -141 189 185 -91 -232 -84 -110 -48 -140 89 -208 24 96 239 216 126 -311 42 110 214 -124 305 147 24 -351 319 -21 -352\n3 80 -153 104 -67 64 73 219 -303 89 -46 -237 -169 93 -43 -37 -180 -68 90 154 58 41 149 -82 146 -167 -58 -1 -87 124 201 170 -70 84 43 -54 88 275 265 166\n-10 -9 -7 6 8 -6 -6 1 7 8 9 4 3 1 5 3 4 -3 -4 -1 3 2 -8 -8 -9 -3 -3 2 2 -1 -8 2 1 -5 -10 -9 0 7 3 9\n5 -6 3 -10 5 -10 3 -1 9 1 1 2 -6 3 5 7 2 4 0 -6 -6 2 -1 -3 0 -1 -10 2 8 3 1 3 7 -6 -4 -6 7 1 -4 6\n-7 7 -1 9 0 6 6 -8 0 -4 -4 -4 1 -3 3 3 7 4 -5 -3 9 -2 3 -1 -6 9 3 -9 0 9 8 -5 6 -3 -6 8 -7 -9 2 -5\n9 1 2 -8 8 -5 -3 5 1 2 -7 1 -10 6 -10 -5 -3 -5 -4 7 -5 6 5 3 -7 9 -6 8 2 6 -6 -6 -3 6 -4 -4 3 4 3 -5\n8 -2 -2 1 6 -10 6 -7 -5 4 3 -8 1 -2 -2 -4 9 2 -5 2 -2 -9 6 6 -1 4 4 -8 -10 -3 9 9 -2 9 0 -6 9 8 -10 7\n-6 3 9 -3 3 -3 4 2 1 1 -6 -10 -6 2 -2 3 -3 -8 -3 9 -9 9 8 -1 0 -10 4 0 0 4 9 -3 9 8 4 2 8 -10 -6 -1\n-7 -9 -1 -3 3 -1 2 2 1 -10 2 -5 1 -8 4 -9 5 -10 -7 -5 -4 -8 -6 -5 -9 1 7 1 1 4 -10 -3 5 -8 4 -10 1 -3 3 5\n9 7 2 -8 9 -4 -7 4 9 -3 2 -5 -1 6 1 -8 9 -10 3 1 -4 -4 0 3 -2 -6 4 1 -7 9 8 4 6 0 6 5 -1 -10 -8 -2\n9 4 3 -10 -8 6 -7 4 -1 -2 -5 5 4 5 -1 4 1 5 -4 -3 4 -6 -9 0 -3 0 7 6 0 9 -6 -9 -5 -1 -9 -2 -4 6 -8 5\n-5 9 -8 9 -4 1 4 -1 8 2 6 2 6 0 -8 5 -10 -10 1 -8 9 5 -7 -5 7 6 -5 -7 3 9 0 8 0 2 -1 -2 6 5 -1 4\n-3 -4 9 6 -2 -9 1 -2 3 -7 -8 -5 0 -5 -8 -3 -9 -3 -8 -4 8 2 -6 -10 7 -4 -2 -5 -9 7 1 -9 5 0 7 -7 -6 -2 -7 7\n-7 -5 4 -4 -8 6 3 6 -7 6 -8 3 -10 9 3 -1 -5 3 -4 8 -7 8 9 8 -10 6 4 6 7 -1 -4 2 5 -10 8 7 7 -6 3 2\n-10 -2 -4 2 -3 1 -8 -6 7 -2 -8 -10 8 4 0 1 -8 6 -3 9 -4 -5 -6 -9 -4 -8 0 -7 8 6 5 8 -6 3 -7 1 7 7 -3 4\n-5 -1 4 6 5 -6 9 8 3 -4 -1 9 2 3 -10 0 -2 -8 3 -4 8 -10 7 -8 -4 -10 -5 -7 7 2 7 4 4 -7 -8 -9 9 -9 9 2\n-10 -1 1 2 4 -7 4 -8 -4 -3 -9 -6 9 8 9 -5 0 -6 -2 -3 -1 7 3 5 -10 6 6 -10 -1 6 2 -1 7 6 3 1 9 -3 -4 -5\n-4 -3 0 8 -5 -9 -7 5 -5 -6 4 -4 3 9 3 4 -3 0 -4 7 8 0 8 -3 -4 2 8 -4 1 6 -7 8 -7 -5 6 -2 -4 1 5 -6\n-3 -1 -8 -9 -9 6 -3 -2 8 3 -5 -2 5 -6 5 -8 -2 -5 -10 9 -8 5 -1 -5 -9 -5 -4 -3 -1 -9 -7 6 -7 -4 7 -6 -8 -6 2 -10\n-1 0 -10 -5 -4 5 9 -4 -10 1 -5 4 -4 5 -10 9 2 8 9 -9 9 -8 0 -8 -2 -3 8 -8 -6 -7 4 3 3 4 0 1 -9 -9 7 -8\n2 4 -2 1 -9 -10 0 4 8 -1 -3 8 -6 7 2 -6 7 1 -3 -9 4 3 -4 9 -2 -1 -8 -1 0 1 -7 5 -5 2 -4 9 -6 6 -5 -7\n8 2 -9 -8 -8 -5 -4 1 -2 -5 2 -8 9 0 3 -3 9 -3 -2 -8 8 -6 7 6 -2 -7 5 2 1 -10 5 -9 -6 -2 5 8 4 -8 -1 4\n9 3 -1 8 -6 -8 7 5 0 -4 -1 -10 -8 -4 6 0 -9 1 -8 -5 -7 0 -4 -10 0 -8 8 6 6 -2 1 5 3 -10 4 -1 4 -7 -5 -6\n-9 4 7 -7 3 3 -5 4 7 -2 1 -10 0 8 2 -10 2 1 -1 -10 1 -10 5 -6 -10 -9 4 4 -5 1 1 8 7 -2 -8 0 3 -3 7 0\n-3 -2 -7 -1 8 5 -8 -8 8 1 -8 -1 1 0 -4 -7 1 2 -1 -2 5 2 9 2 2 -9 5 -4 -10 -6 -2 -10 2 1 -1 -7 9 1 -5 7\n4 -10 9 -5 0 7 -10 3 -1 -8 4 6 4 3 -10 9 -4 5 7 -4 9 -5 -4 -6 7 -2 9 6 9 -6 -5 4 -6 -6 1 -4 -9 -6 -10 -8\n-4 4 8 2 -3 9 -7 -5 -4 -10 1 -4 -4 0 -8 5 8 -9 -7 -1 7 -2 5 4 3 9 -10 -4 -7 2 -1 -9 -4 -3 -5 -5 -4 -1 0 -5\n-9 4 1 -3 -6 -5 -8 4 8 7 5 5 -4 1 -9 1 -8 4 7 7 -4 -4 8 -5 -4 5 -8 -6 6 -5 -1 8 9 2 -5 5 7 -10 -9 5\n7 6 -7 5 -3 6 -4 -1 0 -6 -4 7 -8 6 4 -2 -6 6 3 -10 -9 4 0 2 -3 6 -3 -6 -2 -2 2 7 -5 -3 -5 -6 -7 1 -4 4\n-3 -6 -7 0 3 7 0 7 -5 5 -1 -3 0 -10 9 7 -2 9 3 -2 9 7 -5 6 -6 0 -9 -10 4 9 -4 -9 -7 -1 -7 6 8 -4 -5 -7\n-9 5 -8 -7 -3 4 2 5 -5 -4 -7 -6 -7 -10 -9 -10 1 4 -10 7 3 8 0 -2 9 -4 -5 7 2 -8 2 -5 -1 -3 -9 6 -9 3 1 -4\n1 4 -8 5 -3 -7 -3 8 7 9 -3 -8 7 7 1 -2 -7 -2 7 -3 0 -1 -5 -10 -2 -4 -2 -9 1 -10 -3 -7 -4 -8 0 3 -5 7 -7 5\n-2 -8 7 -5 -10 -10 3 5 -2 0 5 9 1 -10 1 2 8 9 3 -1 1 3 -6 0 5 4 5 2 1 1 -3 1 3 7 6 -5 7 -9 -9 -4\n-7 -2 7 -3 -2 -10 9 8 1 -6 9 5 7 -6 -5 2 0 2 7 4 -7 -6 -5 -1 3 4 4 1 5 -3 -1 1 5 8 0 5 8 -9 -5 -1\n-5 -5 -6 -7 -9 -9 -3 1 -4 -6 -5 -1 -9 1 0 4 -5 -5 7 2 2 8 5 -10 6 -5 5 4 -4 -9 6 -6 8 2 9 1 4 -4 -8 -10\n-7 -10 -9 6 -7 2 0 -10 -1 -10 2 3 8 -10 3 5 -5 -9 -9 -6 4 7 -2 2 0 9 5 6 -5 7 6 -10 -1 -1 6 2 3 9 2 -8\n9 7 6 -1 7 -9 -6 4 -8 8 0 6 5 0 -10 7 -1 5 3 -3 -5 -9 -3 -4 -7 6 9 6 5 -7 9 -4 2 -3 5 -1 -2 2 6 -7\n0 -4 1 7 7 -6 5 -4 9 -10 3 6 -8 3 -7 -5 -1 4 3 6 7 2 -8 -8 1 7 1 -10 -9 9 5 -7 -4 -4 -9 5 0 -2 -9 -8\n-2 -3 0 0 2 3 -3 -9 9 -9 -1 -1 -5 1 1 7 -10 4 -1 -8 4 -6 -5 2 -8 8 -3 3 -4 -10 -3 5 9 7 7 1 -7 7 -6 -8\n8 3 -7 5 -6 4 -6 7 -1 -5 9 5 -1 6 -3 -6 -3 4 -1 3 -4 6 -2 -4 -5 8 7 -2 5 4 -7 -5 -3 -4 -10 -6 3 7 -9 4\n-8 2 -1 -6 -10 6 -2 -3 -8 7 -9 -10 -5 -9 -4 0 9 6 9 -4 0 4 1 -1 -10 -6 3 -5 -9 4 9 -7 -4 -2 -3 9 6 -3 -4 0\n-6 9 1 -1 -9 -1 2 2 7 1 9 -3 7 -8 7 -1 8 0 5 9 7 4 5 5 5 -8 4 -7 0 3 -4 -4 2 -1 -2 3 0 -10 8 -2\n" }, { "path": "programming_assignments/beale_ciphers/testcase/small/test8.out", "content": "1\n" }, { "path": "programming_assignments/jukebox/.gitignore", "content": "*.bundle.*\nlib/\nnode_modules/\n*.egg-info/\n.ipynb_checkpoints\n*.tsbuildinfo\njupyterlab_git/labextension\n\nsrc/version.ts\n\n# Integration tests\nui-tests/test-results/\nui-tests/playwright-report/\n\n\n# Created by https://www.gitignore.io/api/python\n# Edit at https://www.gitignore.io/?templates=python\n\n### Python ###\n# Byte-compiled / optimized / DLL files\n__pycache__/\n*.py[cod]\n*$py.class\n\n# C extensions\n*.so\n\n# Distribution / packaging\n.Python\nbuild/\ndevelop-eggs/\ndist/\ndownloads/\neggs/\n.eggs/\nlib/\nlib64/\nparts/\nsdist/\nvar/\nwheels/\npip-wheel-metadata/\nshare/python-wheels/\n.installed.cfg\n*.egg\nMANIFEST\n\n# PyInstaller\n# Usually these files are written by a python script from a template\n# before PyInstaller builds the exe, so as to inject date/other infos into it.\n*.manifest\n*.spec\n\n# Installer logs\npip-log.txt\npip-delete-this-directory.txt\n\n# Unit test / coverage reports\nhtmlcov/\n.tox/\n.nox/\n.coverage\n.coverage.*\n.cache\nnosetests.xml\ncoverage.xml\n*.cover\n.hypothesis/\n.pytest_cache/\n\n# Translations\n*.mo\n*.pot\n\n# Scrapy stuff:\n.scrapy\n\n# Sphinx documentation\ndocs/_build/\n\n# PyBuilder\ntarget/\n\n# Jupyter Notebook\n.ipynb_checkpoints\n\n# pyenv\n.python-version\n\n# celery beat schedule file\ncelerybeat-schedule\n\n# SageMath parsed files\n*.sage.py\n\n# dotenv\n.env\n\n# virtualenv\n.venv\nvenv/\nENV/\n\n# Spyder project settings\n.spyderproject\n.spyproject\n\n# Rope project settings\n.ropeproject\n\n# Mr Developer\n.mr.developer.cfg\n.project\n.pydevproject\n\n# mkdocs documentation\n/site\n\n# mypy\n.mypy_cache/\n.dmypy.json\ndmypy.json\n\n# Pyre type checker\n.pyre/\n\n# End of https://www.gitignore.io/api/python\n\n# OSX files\n.DS_Store\n\n# jetbrains ide stuff\n*.iml\n.idea/\n\n# vscode ide stuff\n*.code-workspace\n.history\n.vscode\n\n# vim stuff\n*.swp\n" }, { "path": "programming_assignments/jukebox/README.md", "content": "# Jukebox\n\n- 문제 출제 및 검수: lucas.ii\n- 해설 작성자: iggy.ll\n\n> 이 문서에는 Jukebox 문제의 요약과 간단한 설명이 덧붙여져 있습니다. **문제 원문은 [jukebox.pdf](jukebox.pdf) 문서에 있습니다.** \n> 문제에 대한 해설과 풀이는 [solution](solution/) 디렉토리를 참고해주세요.\n\n## 1. 문제 설명\n\n사용자의 성향을 고려해 각 사용자가 좋아할 음악을 추천하는 추천 시스템을 만들고자 합니다. 각 사용자가 들었던 음악과 그 음악을 들은 횟수가 입력으로 주어집니다. 임의의 Collaborative Filtering 알고리즘을 구현해, 추천 시스템을 구현하고 이를 오프라인으로 평가하는 것입니다.\n\n## 2. 실험에 필요한 데이터\n\n### `listen_count.txt`\n\n각 유저가 어떤 음악을 몇 번 들었는가를 표현하는 데이터입니다. ``, ``, ``가 공백을 기준으로 구분되어 있습니다.\n\n예시:\n\n```text\n18091 6716 3\n15772 1251 1\n...\n```\n\n### `test_data.txt`\n\n평가 데이터는 미리 주어지지 않습니다. 제출하기 이전에, 이 데이터를 임의로 학습 데이터, 테스트 데이터로 나눈 뒤, validation을 수행하기를 권장합니다.\n평가 데이터의 형식은 다음과 같습니다. 평가 데이터에서, 각 유저마다 유저가 실제로 들은 아이템의 수는 다를 수 있습니다.\n\n```text\n$ cat test_data.txt\n15772 3663 2151\n3759 2554 1151 3399\n...\n```\n\n### 3. 추천 성능 평가\n\n추천 성능의 평가 기준은 NDCG@100입니다. 주어진 데이터에서 가장 청취 회수가 많은 곡 100개를 유저에게 추천했을 때의 NDCG@100는 0.1입니다. 제출한 결과물은 평가 데이터에서 평가했을 때, NDCG@100이 0.2보다 크기를 기대합니다.\n\n### 4. 수행 과정\n\n#### `train`\n\n- 주어진 데이터(listen_count.txt)를 이용해 추천 모델을 생성합니다.\n- 모델을 생성하지 않는 경우, 이 과정을 생락하셔도 좋습니다.\n\n실행 방법: `./train `\ne.g., `./train listen_count.txt my_model`\n\n#### `recommend`\n\n`train`에서 학습한 아웃풋 모델을 이용해, 유저 아이디가 주어졌을 때의 추천을 K개 생성합니다.`train` 과정을 생략한 경우, ``을 여기서 사용해도 좋습니다. 입력에 쓰이는 `user_id.txt`는 각 라인마다 유저 아이디를 담고 있는 파일입니다.\n\nuser_id.txt의 예시:\n\n```text\n15722\n2716\n3759\n```\n\n실행 방법: `./recommend user_id.txt `\ne.g., `./recommend my_model user_id.txt 100`\ne.g., `./recommend listen_count.txt user_id.txt 100`\n\n```text\n$ ./recommend my_model user_id .txt 5\n15772 201 200 1819 215 203\n2716 514 184 1235 1184 1752\n3759 514 534 1249 6341 4623\n```\n\n결과 형식은: 각 줄의 첫 번째 단어는 유저의 아이디, 이후 K개 단어는 각각 유저에게 추천되는 K개의 아이템 아이디입니다.\n\n`15772 201 200 1819 215 203`\n\n이 라인은, 유저 15772가 201 200 1819 215 203를 순서대로 좋아할 것라는 의미입니다.\n\n#### `evaluate`\n\n`recommend`에서 생성한 추천과, test data를 비교해 추천의 NDCG@100 성능을 평가합니다. test data는 다음과 같은 형태입니다. 각 줄의 첫 번째 단어는 유저의 아이디이며, 각 줄의 나머지 단어는 유저가 실제로 들은 아이템의 리스트입니다. 평가 데이터에서, 각 유저마다 유저가 실제로 들은 아이템의 수는 다를 수 있습니다.\n\n```text\n$ cat test_data.txt\n15772 3663 2151\n3759 2554 1151 3399\n...\n```\n\n### 5. 제약 조건\n\n- 8core, 8GB 머신에서 전체 수행 시간 20분 이내에 추천을 생성할 수 있어야 합니다.\n- 채점의 용이성을 위해 C, C++, Python, C#, Java, Scala 중 하나의 언어를 사용하기를 권장하지만 다른 언어 사용을 원하는 경우 사전에 협의 가능합니다.\n- 오픈소스로 추천 라이브러리, 혹은 머신 러닝 라이브러리를 사용할 수 있습니다.\n\n### 6. 제출 파일\n\n1. 구현 코드\n1. 구현한 방법에 대한 간단한 설명과 실험 결과 리포트\n1. 구현 코드를 실행하는 방법에 대한 설명\n1. 실험에 사용한 학습/평가 데이터와, 모델을 생성했다면 생성한 모델\n\n### 7. 평가 기준\n\n- 제약 조건 이내에 컴파일 후 추천을 생성할 수 있는지\n- 생성된 추천의 NDCG@100\n- 사용한 알고리즘과 그 알고리즘에 대한 이해도\n- 코드를 효율적이고 이쁘게 구현하였는지.\n\n### Note\n\n- NDCG@100 점수가 유일한 평가 기준은 아닙니다. 어떤 모델을 사용하기로 선택했는지에 따라 NDCG@100이 크게 달라질 수 있기 때문입니다. 추천 시스템에 대한 경험이 많으면 우수한 모델을 쉽게 선택하고, 좋은 오픈 소스 구현체들을 손쉽게 가져올 수 있기도 합니다.\n- 직접 모델을 구현하는 경우, 추천 알고리즘을 제한 시간 이내에 올바르게 생성하는 코드를 효율적으로 구현하는 것이 오픈 소스를 사용하는 경우 모델 선택을 한 방법과 이유, 그리고 실험 설계와 평가를 얼마나 논리적으로 수행했는가가 채점에서 중요한 요소가 됩니다.\n" }, { "path": "programming_assignments/jukebox/listen_count.txt", "content": "18091 6716 3\n15722 1251 1\n2716 4394 1\n3759 7857 4\n11755 5000 1\n15712 1776 1\n10826 3374 1\n5074 4635 1\n4068 1755 1\n16290 2588 15\n7025 3230 1\n4902 2668 1\n5060 1580 1\n5002 4176 1\n11882 1768 1\n6058 2698 2\n10865 3661 1\n12947 235 1\n10325 755 1\n8251 1710 2\n9941 7527 1\n12499 1251 1\n13465 685 1\n16914 6031 1\n127 915 1\n7560 3602 1\n13464 8238 1\n16384 4967 1\n8088 809 3\n2156 4472 1\n12702 3564 1\n16831 1116 1\n19989 7085 1\n15599 3555 1\n7910 6099 1\n16645 2689 1\n2480 1234 3\n16274 5051 8\n2204 874 1\n13600 3438 1\n9954 628 1\n778 1356 1\n6740 4500 1\n5860 23 2\n12706 1305 22\n8720 1772 1\n16359 2352 6\n387 1116 1\n8737 4944 3\n16916 4121 2\n6657 1946 2\n10736 1388 1\n717 496 1\n17912 95 4\n1847 5302 1\n4265 5036 1\n1214 6640 1\n56 2688 1\n13372 698 1\n18940 214 4\n1148 3206 1\n12595 4949 1\n5402 2097 5\n7387 6180 1\n5005 175 4\n11533 8148 1\n15576 2399 1\n17514 219 2\n10325 708 1\n10533 7487 4\n11122 4543 1\n18250 1714 1\n6895 3820 1\n11876 1755 1\n1474 1730 8\n5637 2736 3\n8471 6220 2\n17586 1342 1\n3572 1284 19\n5696 524 2\n8393 1275 2\n11516 1766 1\n11612 1249 16\n9386 1816 1\n2625 6229 4\n15230 229 17\n3781 508 1\n6048 506 12\n2209 3400 3\n9787 1975 2\n19079 5653 1\n13870 543 3\n8927 541 1\n18244 1267 1\n1754 3233 2\n17486 2008 1\n16493 5737 1\n8768 3316 2\n6894 910 5\n899 5243 1\n14253 2522 1\n2797 1775 4\n5140 7013 1\n10688 663 1\n4541 7381 1\n14074 1164 4\n10399 1710 4\n11230 2428 1\n3340 276 2\n3516 1561 2\n13652 2836 1\n16715 3510 4\n4120 3480 1\n16022 763 2\n473 23 1\n12870 537 1\n11271 1717 1\n10852 929 5\n4057 670 1\n8313 934 1\n1625 364 1\n19872 5565 1\n8105 692 1\n11406 1359 1\n17926 1037 2\n8532 1236 1\n4841 1755 1\n9402 1081 4\n19693 2662 1\n7227 7936 1\n9624 1788 3\n14470 5105 1\n19141 4995 1\n5608 753 1\n9457 2404 2\n3700 1027 1\n11519 1788 1\n4546 201 4\n18698 2691 4\n15047 203 26\n19034 1118 1\n11793 3973 1\n6259 206 2\n2803 5294 3\n4617 7204 8\n7482 1779 7\n2905 5441 1\n9322 6564 1\n12892 6361 1\n822 3834 1\n2135 1707 1\n8528 1275 1\n14790 1687 1\n9805 4182 3\n15107 207 5\n18681 7809 1\n14752 6200 1\n16250 201 2\n9329 8127 2\n19243 2438 1\n11880 3580 2\n1552 7604 1\n10137 34 5\n2584 2493 1\n13462 4022 3\n1966 1548 4\n15314 6758 1\n5495 3699 2\n18027 6926 1\n16253 303 1\n6926 1208 2\n9097 2953 35\n9488 1779 1\n10711 201 1\n6269 7229 5\n1092 7798 1\n16238 2686 1\n17313 622 1\n8810 7466 1\n8343 215 6\n19612 6768 5\n2691 827 2\n8438 199 4\n12706 5018 5\n6871 2671 1\n11060 3701 1\n3189 4207 2\n630 6575 1\n15107 631 1\n8989 3283 1\n7994 874 2\n14700 827 1\n2792 23 1\n17388 186 1\n15061 484 1\n1566 1785 1\n4925 3540 8\n14828 3917 1\n10287 6495 13\n10927 5432 2\n3986 200 3\n10592 3065 1\n19319 1036 1\n208 1247 1\n3048 252 2\n8448 6481 2\n1217 203 16\n10852 3596 2\n11556 184 1\n1143 23 2\n1863 2363 2\n616 7256 1\n6185 2478 6\n9398 1350 3\n8824 533 7\n15714 3804 1\n17328 6623 1\n3739 2402 1\n14412 219 1\n14865 2632 1\n380 1741 4\n153 7096 3\n899 960 1\n2293 4386 3\n8383 1707 1\n6265 8026 1\n19094 2892 1\n8198 3173 6\n5875 1474 1\n10234 1250 17\n5816 7182 2\n4110 207 1\n13 958 1\n7498 7045 1\n5974 1464 1\n14087 2027 5\n15122 2016 1\n11238 2691 1\n16178 1311 1\n9836 4023 4\n3253 2474 2\n1217 4720 5\n17205 2626 1\n6341 1314 1\n16916 6949 1\n17124 2622 1\n5631 840 5\n4539 1235 18\n12303 1248 1\n18116 1781 2\n13841 295 4\n10413 4620 1\n12755 1770 1\n18391 3526 1\n8539 2488 2\n3119 2656 2\n15220 318 1\n17475 545 1\n7432 4555 2\n10064 1724 6\n16178 1658 1\n2319 2915 1\n19271 1733 3\n5684 2087 2\n18413 2262 6\n3796 222 1\n8129 746 1\n11890 128 3\n3548 1710 3\n19966 3552 2\n16916 4404 1\n4184 5016 1\n5798 4882 1\n20090 7750 1\n12982 173 1\n3048 4200 1\n4960 5294 3\n10413 5037 1\n130 5920 2\n13084 13 1\n15668 222 50\n10267 1781 1\n11696 1244 2\n2731 867 2\n4181 8200 1\n12377 7636 1\n2985 656 1\n9743 1768 2\n184 200 14\n13097 2949 1\n18315 2287 2\n2059 1395 1\n12817 7674 1\n236 1694 5\n10730 200 1\n5573 399 1\n124 5552 1\n19002 4589 1\n1499 5621 1\n6928 1751 2\n2591 506 1\n391 6142 2\n4386 6484 1\n17184 765 1\n1398 1244 1\n2483 6482 8\n808 2653 1\n1028 2118 1\n1088 7683 2\n15471 3798 9\n6183 201 8\n19608 4653 1\n8018 6161 1\n8108 1018 3\n19873 533 1\n16870 23 1\n6769 860 1\n13114 1247 1\n5261 533 1\n6228 790 1\n9369 3287 1\n4688 951 1\n1618 1747 8\n6265 1922 1\n2330 229 2\n12294 196 11\n14579 6680 2\n8790 4702 1\n1718 1946 1\n504 3834 1\n19826 2114 1\n16569 5468 4\n16661 775 1\n2206 3617 1\n14671 308 1\n18122 8161 4\n4242 2068 1\n7394 2876 1\n18420 8183 1\n19322 3799 2\n10060 1781 2\n5911 6179 1\n13 599 3\n8110 2722 1\n10146 6588 1\n16231 3866 9\n12633 2559 1\n9462 2132 2\n14233 7249 3\n18140 3278 33\n11387 976 1\n16061 2971 1\n14060 232 2\n16886 1374 2\n7686 7643 5\n14235 6152 1\n4632 3794 1\n13758 418 1\n13965 330 1\n13343 5674 1\n16089 411 1\n13997 799 1\n16815 3715 4\n19161 4965 3\n5176 1747 1\n11271 2721 1\n3093 246 1\n10236 8072 4\n11527 1432 1\n11271 447 1\n4900 302 2\n15774 1416 1\n875 532 1\n13060 292 1\n17492 1819 1\n1986 81 1\n9548 2019 2\n12985 2216 1\n1832 4819 1\n1686 4284 2\n13058 2206 1\n9952 1356 1\n1551 214 1\n7105 1247 4\n1397 1546 1\n6749 709 2\n1752 1333 1\n10351 1060 15\n4979 8191 1\n20123 23 1\n18015 7221 1\n9762 1688 1\n9117 910 2\n11010 2571 1\n9930 502 1\n11784 623 1\n170 7605 2\n883 867 2\n5118 5093 1\n15383 2077 1\n18346 6252 2\n525 1745 1\n4923 6892 6\n2194 411 15\n5677 962 3\n13501 1374 1\n10775 6620 4\n12174 1250 1\n9007 2428 2\n17767 6545 1\n135 6191 16\n8138 777 1\n14093 2991 1\n19771 2730 1\n18175 1277 1\n11301 199 1\n4106 3540 1\n12378 156 1\n5879 1756 14\n7916 1703 1\n7135 1768 1\n10926 2949 94\n3499 1781 2\n10498 1272 1\n16791 1834 2\n12967 3180 1\n18199 2722 5\n48 2380 4\n11156 6018 8\n4890 800 1\n9353 4623 1\n15778 891 1\n6463 2014 2\n20159 4101 1\n6124 1757 43\n11786 2025 3\n16831 1019 4\n5018 197 1\n10382 452 1\n4287 6065 2\n8760 2175 2\n5550 1749 2\n11726 4672 1\n7857 173 1\n18508 5565 1\n19326 1742 1\n13482 4992 1\n8391 934 1\n7065 5879 1\n114 5114 1\n9423 252 1\n13994 126 1\n5086 6632 2\n4453 1644 1\n5428 2542 5\n11849 717 1\n19094 3850 1\n2674 4924 4\n712 1825 2\n17618 519 1\n4199 867 2\n8275 4386 2\n16462 8117 1\n8860 4011 1\n19426 4342 2\n863 3634 1\n4875 3026 1\n4081 1781 3\n2512 8145 5\n10426 5245 1\n18014 1331 1\n12045 4590 5\n4698 4202 1\n5286 2364 1\n14924 494 1\n13148 1295 1\n91 2499 1\n3675 498 1\n7750 207 3\n13830 5336 1\n15553 1146 1\n15978 1237 6\n4036 1691 1\n3661 682 1\n17152 221 3\n81 1007 1\n16689 1688 2\n6893 375 2\n8937 1760 2\n11131 3635 1\n12167 3304 1\n11145 3909 1\n10579 7944 3\n2058 207 2\n6435 1007 1\n15506 5031 2\n7162 4976 6\n9975 207 1\n12262 6644 3\n4519 4107 1\n5185 6527 1\n6556 5472 1\n12397 1012 1\n12577 967 1\n18964 4245 1\n864 2508 2\n5215 4805 1\n10693 5074 1\n11622 718 5\n19072 2789 1\n19759 3338 7\n4898 7597 11\n11148 844 2\n14043 4622 1\n2284 8175 1\n9946 6719 4\n14721 1036 1\n19030 3219 2\n11566 6169 2\n517 219 5\n13579 1726 1\n3158 229 2\n11597 5551 1\n7829 1825 1\n17027 595 4\n952 1247 1\n18970 6334 1\n6152 4336 1\n6188 723 1\n14642 7421 1\n10355 1571 1\n12146 194 1\n19872 470 1\n10826 655 1\n6244 4204 45\n3734 41 3\n170 1450 3\n1712 1689 1\n7995 5324 1\n12118 1275 1\n1353 3853 1\n6501 2316 2\n1712 4841 1\n3889 1760 2\n9063 220 1\n7968 2853 1\n9745 4263 4\n7179 2534 1\n7762 10 1\n11390 5255 2\n4231 5389 1\n195 252 1\n733 1379 1\n8490 1726 3\n1376 2169 2\n13632 3899 1\n6397 6288 1\n236 945 2\n10293 215 1\n19290 3671 7\n14692 232 1\n11882 3278 1\n20000 151 1\n15599 1342 1\n6781 5023 1\n17188 6343 1\n17748 665 1\n4758 1748 7\n11938 232 2\n13740 6751 2\n4663 725 1\n15683 442 2\n7358 3971 1\n1706 1302 2\n12361 46 10\n6463 3710 2\n19871 4739 3\n2748 5767 1\n12838 4591 1\n15896 2729 1\n2583 3024 1\n3947 2620 1\n174 8118 1\n3573 2983 1\n9000 1357 3\n92 4129 2\n15509 23 7\n18869 213 3\n9466 1816 4\n788 5730 1\n14010 7045 6\n787 1363 1\n3806 3113 2\n8868 2032 1\n11832 2897 1\n10056 1986 1\n301 498 1\n12 504 1\n11372 10 4\n19822 3578 2\n18303 7395 1\n9930 4996 1\n8406 7850 1\n9169 7497 4\n4397 221 1\n16974 34 1\n14114 385 1\n314 1561 1\n15567 1610 3\n7931 3596 3\n124 5477 1\n7817 5243 17\n12853 3534 1\n1997 203 4\n5136 184 1\n6540 7220 2\n1322 1710 2\n15011 756 2\n7956 23 5\n18767 3558 1\n2643 1380 1\n6294 783 3\n1801 6884 3\n12081 2219 3\n5161 1305 1\n8408 917 1\n15374 2024 1\n1058 3399 4\n17324 874 2\n16645 5018 1\n11938 6481 2\n14616 229 1\n16779 1698 2\n9921 4020 2\n2172 1453 1\n16313 5607 1\n3112 1991 7\n19184 524 5\n18786 7101 16\n10828 353 4\n787 2383 1\n7176 1778 3\n9824 850 1\n6333 2677 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2\n13017 2964 1\n6855 759 5\n18033 3922 1\n14252 3163 13\n17179 3163 7\n8458 232 1\n3392 8082 15\n8242 3471 58\n11762 221 3\n3574 5911 2\n18781 2369 1\n13119 1703 3\n7780 864 2\n18118 667 1\n15635 659 1\n5952 5302 3\n18489 2184 1\n11616 597 2\n7445 532 4\n16554 631 1\n3603 2534 5\n19486 1205 1\n419 3916 1\n7809 828 1\n9485 13 1\n1872 3275 1\n14212 2938 1\n8438 4306 1\n9374 1762 1\n5053 292 1\n4574 7097 28\n4687 2190 1\n2045 1363 1\n74 3481 3\n769 4703 1\n6949 2591 1\n11851 2704 1\n6894 6339 4\n15635 612 1\n17894 1736 1\n5494 1747 2\n17743 306 1\n6644 2789 1\n5995 2661 1\n19331 6102 1\n7893 3015 6\n4371 374 1\n17224 1783 1\n19763 40 1\n636 6897 1\n1001 2575 5\n12493 507 2\n19086 2355 1\n8560 3477 1\n15468 3511 3\n19761 2072 2\n530 7122 2\n16716 1190 1\n7651 7471 1\n18893 7969 1\n18918 201 14\n124 5413 1\n7991 3596 3\n9787 2968 1\n13023 942 1\n745 624 1\n8229 357 1\n15260 5062 2\n11367 6341 1\n4305 2600 1\n20145 1235 2\n18657 6106 1\n4963 6355 1\n10703 1342 2\n715 4175 1\n3738 8200 6\n17695 2369 1\n13686 1727 1\n12619 1732 3\n5862 2653 1\n16698 4447 1\n12378 413 1\n10654 2190 1\n19344 5436 1\n6510 1248 1\n4679 215 4\n19053 744 1\n2104 3273 1\n7295 5439 2\n12775 1664 1\n20044 7666 4\n6457 7073 1\n19355 1990 1\n19286 2894 1\n5479 759 1\n873 1996 2\n16839 2675 1\n484 2058 1\n17083 504 1\n12152 186 1\n1989 3156 2\n11327 367 2\n4880 7531 1\n3485 1464 1\n11461 501 1\n7022 7227 1\n14884 2646 11\n9445 471 1\n5298 3634 1\n2629 1768 2\n16831 1775 2\n4492 519 1\n15686 505 4\n8560 597 1\n10401 2671 1\n10338 2362 2\n15707 5420 3\n486 2103 3\n17738 863 2\n2942 2515 1\n2319 5120 1\n16104 1827 21\n9597 2813 2\n5318 187 1\n4140 6198 7\n5882 1206 1\n13285 2555 2\n34 1842 2\n19952 5259 1\n8007 1771 4\n8021 3516 17\n18665 1757 2\n13799 200 16\n4542 2216 7\n17298 1663 2\n6183 533 3\n14218 1732 2\n13645 1335 1\n17742 233 3\n10452 3748 1\n3847 1829 1\n14780 222 1\n14005 5086 1\n15140 200 5\n14900 1453 1\n6229 3626 1\n12913 3399 1\n8549 514 2\n86 3983 1\n1304 6482 1\n12200 3848 2\n1772 440 1\n9192 6705 1\n2223 201 2\n62 2933 1\n6741 206 5\n4055 4486 2\n19881 498 3\n17260 4653 2\n2910 3207 18\n6809 1241 7\n19826 423 1\n5320 3714 7\n2801 789 1\n17357 1366 1\n18149 215 8\n6687 7772 2\n13928 7489 1\n1443 2767 3\n593 1743 1\n2772 201 5\n17302 752 1\n20180 3631 2\n18698 1724 1\n12700 2584 4\n5684 482 2\n5681 184 1\n3651 2581 2\n20059 7983 2\n18347 7554 2\n3956 745 5\n14490 1788 1\n15352 5885 1\n19313 1704 4\n18293 427 1\n14271 4061 10\n6687 823 1\n11912 5506 1\n3996 6542 3\n7129 1275 13\n6849 5243 1\n5408 3262 1\n19990 229 3\n17361 4009 1\n14150 1752 1\n94 4241 6\n6263 3854 1\n10496 7961 5\n6509 5738 3\n16931 2595 1\n1151 7706 5\n12812 1734 1\n10824 2419 1\n19470 1726 1\n13624 184 3\n11185 6914 2\n10733 7801 1\n13873 219 2\n7028 4992 1\n6153 2256 1\n8520 7437 10\n3175 7840 1\n11386 581 1\n5438 303 5\n8015 200 1\n5059 508 1\n15566 1539 1\n11727 2864 3\n19872 881 1\n5117 929 2\n5834 690 1\n6700 206 11\n18201 3526 2\n1866 215 2\n1404 8029 1\n129 5772 2\n388 3629 4\n18257 3391 1\n17909 2349 1\n6235 7450 1\n19351 5330 10\n414 366 1\n16619 2013 3\n2641 2377 1\n6332 230 4\n15323 220 1\n8439 521 1\n6140 1363 1\n7904 919 1\n857 11 1\n17328 7294 1\n13997 1021 1\n" }, { "path": "programming_assignments/jukebox/solution/1. 데이터 전처리.ipynb", "content": "{\n \"cells\": [\n {\n \"cell_type\": \"markdown\",\n \"id\": \"c9a6149a\",\n \"metadata\": {},\n \"source\": [\n \"# 데이터 전처리\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 2,\n \"id\": \"302a585e\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"import pandas as pd\\n\",\n \"from scipy.sparse import csr_matrix\\n\",\n \"from sklearn.utils import shuffle\\n\",\n \"import numpy as np\\n\",\n \"import os\\n\",\n \"import shutil\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"6af0cc5f\",\n \"metadata\": {},\n \"source\": [\n \"## 데이터 읽기\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 2,\n \"id\": \"02eeb334\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"data = pd.read_csv('listen_count.txt', sep=' ', header=None, dtype=str)\\n\",\n \"data.columns = ['uid', 'sid', 'cnt']\\n\",\n \"data['cnt'] = data['cnt'].astype(int)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 3,\n \"id\": \"9f889441\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"name\": \"stdout\",\n \"output_type\": \"stream\",\n \"text\": [\n \"folder exist\\n\"\n ]\n }\n ],\n \"source\": [\n \"try:\\n\",\n \" os.mkdir('./parsed')\\n\",\n \"except FileExistsError:\\n\",\n \" print(\\\"folder exist\\\")\\n\",\n \" shutil.rmtree('./parsed')\\n\",\n \" os.mkdir('./parsed')\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"d3cb7773\",\n \"metadata\": {},\n \"source\": [\n \"## 유저 아이디 저장\\n\",\n \"\\n\",\n \"유니크한 유저 아이디를 가져와서 저장합니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 4,\n \"id\": \"14454e07\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"uids = sorted(data.uid.unique(), key=lambda x: int(x))\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 5,\n \"id\": \"7e8ae522\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"with open(\\\"./parsed/all_uids.txt\\\", 'w') as f:\\n\",\n \" print('\\\\n'.join(uids), file=f)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 6,\n \"id\": \"b79ab959\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"n_user, n_song = len(data.uid.unique()), len(data.sid.unique())\\n\",\n \"data_len = len(data)\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"cea206d4\",\n \"metadata\": {},\n \"source\": [\n \"## 데이터셋 나누기\\n\",\n \"\\n\",\n \"전체 데이터를 8:2 비율의 train/validation 데이터로 split합니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 7,\n \"id\": \"8b89e881\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"shuffled_data = shuffle(data)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 8,\n \"id\": \"dfc596c4\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"ratio = 0.8\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 9,\n \"id\": \"84f9cfd3\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr, val = shuffled_data[:int(data_len * ratio)], shuffled_data[int(data_len * ratio):]\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 10,\n \"id\": \"78faabca\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr_in_uids = set(tr.uid.unique())\\n\",\n \"tr_in_sids = set(tr.sid.unique())\\n\",\n \"val_filtered = val[val.uid.isin(tr_in_uids) & val.sid.isin(tr_in_sids)]\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"fabbde30\",\n \"metadata\": {},\n \"source\": [\n \"전처리 코드를 두번 작성하는 것을 막기 위해 저장되는 학습 파일은 실제 데이터([`listen_count.txt`](../listen_count.txt))와 같은 형태로 두는 것이 편리합니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 11,\n \"id\": \"7fbf6130\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr.to_csv('./parsed/listen_count.txt', index=None, header=None, sep=' ')\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"6790c04d\",\n \"metadata\": {},\n \"source\": [\n \"validation 파일은 채점용 데이터([`jukebox.pdf`](../jukebox.pdf)에 기술되어 있는 형태)와 같은 형식으로 두는 것이 편리합니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 12,\n \"id\": \"a0b80e3d\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"save = val.groupby('uid').sid.apply(list).reset_index()\\n\",\n \"with open(\\\"./parsed/TEST_DATA.txt\\\", 'w') as f:\\n\",\n \" for uid, sids in zip(save.uid, save.sid):\\n\",\n \" print(\\\"%s \\\" % uid + ' '.join(sids), file=f)\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"9e0afdcf\",\n \"metadata\": {},\n \"source\": [\n \"데이터가 적절하게 잘 저장되어 있는지 한 번 더 확인합니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 13,\n \"id\": \"bdae351e\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"name\": \"stdout\",\n \"output_type\": \"stream\",\n \"text\": [\n \"listen_count.txt\\n\",\n \"11377 7184 13\\n\",\n \"1852 206 3\\n\",\n \"19145 1692 3\\n\",\n \"15629 585 2\\n\",\n \"15821 5003 1\\n\",\n \"16033 2242 1\\n\",\n \"13306 2920 1\\n\",\n \"16734 2488 2\\n\",\n \"19990 23 5\\n\",\n \"9208 3913 1\\n\",\n \"\\n\",\n \"TEST_DATA.txt\\n\",\n \"1 96 57 101 65 10 58 97 31 47 37 11 20 44 103 35 94 4 6 33 50 19\\n\",\n \"10 305 335 259 263 347 292 289 328 307 321 297 311 286 303 294 202 339 99 323 332 315 356 309 277\\n\",\n \"100 4547 4564 4475 4503 4502 420 4507 4501 1903 4576 4505 4504 4522 4533 4491 4570 4510 4556 4225 4521 4481 4542 4527 4506 4499 4520 4552 890 687 4523 4483 4544\\n\",\n \"1000 3595 3585 201\\n\",\n \"10000 1338 7336 5327 5256 1285 2821 4233 2517 545 2369 1172 4882 4299 427 1042 6979 1194 379 2953 433 137 5253 2494 2981 477\\n\",\n \"10001 4643\\n\",\n \"10002 200\\n\",\n \"10004 2966\\n\",\n \"10005 3723\\n\",\n \"10006 5826\\n\",\n \"\\n\"\n ]\n }\n ],\n \"source\": [\n \"!echo \\\"listen_count.txt\\\"\\n\",\n \"!head ./parsed/listen_count.txt\\n\",\n \"!echo \\\"\\\"\\n\",\n \"!echo \\\"TEST_DATA.txt\\\"\\n\",\n \"!head ./parsed/TEST_DATA.txt\\n\",\n \"!echo \\\"\\\"\"\n ]\n }\n ],\n \"metadata\": {\n \"kernelspec\": {\n \"display_name\": \"Python 3.10.2 64-bit ('py-3.10.2')\",\n \"language\": \"python\",\n \"name\": \"python3\"\n },\n \"language_info\": {\n \"codemirror_mode\": {\n \"name\": \"ipython\",\n \"version\": 3\n },\n \"file_extension\": \".py\",\n \"mimetype\": \"text/x-python\",\n \"name\": \"python\",\n \"nbconvert_exporter\": \"python\",\n \"pygments_lexer\": \"ipython3\",\n \"version\": \"3.10.2\"\n },\n \"vscode\": {\n \"interpreter\": {\n \"hash\": \"9a43ef12e54cbdce1713efe7092ebffcfb641e943ae67d0e6fe4a12aa1b58da6\"\n }\n }\n },\n \"nbformat\": 4,\n \"nbformat_minor\": 5\n}\n" }, { "path": "programming_assignments/jukebox/solution/2-1. Shallow AutoEncoder.ipynb", "content": "{\n \"cells\": [\n {\n \"cell_type\": \"markdown\",\n \"id\": \"020c94ee\",\n \"metadata\": {},\n \"source\": [\n \"# Shallow AutoEncoder를 이용한 Jukebox 풀이\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"631268aa\",\n \"metadata\": {},\n \"source\": [\n \"## Jax 101\\n\",\n \"\\n\",\n \"임의의 행렬 연산에 대한 gradient 계산을 하기 위해서, 행렬 계산 라이브러리로 [jax](https://github.com/google/jax)를 사용했습니다. jax를 사용하면, 간단한 gradient 계산을 numpy를 사용할 때와 거의 같은 방법으로 할 수 있습니다.\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"6e698215\",\n \"metadata\": {},\n \"source\": [\n \"### Super basics of Jax\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 1,\n \"id\": \"587f89fb\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"import numpy as np\\n\",\n \"from jax import grad, jit, vmap\\n\",\n \"import jax.numpy as jnp\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"1d289920\",\n \"metadata\": {},\n \"source\": [\n \"#### 1. numpy array와 jax.numpy.array는 대체로 compatible하다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 2,\n \"id\": \"4ddaded6\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"x = 0.001 * np.arange(16)\\n\",\n \"jx = jnp.array(x)\\n\",\n \"jy = jnp.array(3.141592 * jnp.sin(jnp.arange(16)))\\n\",\n \"a = jnp.array([0.01, 0.01, 0.01])\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"7a22c9e3\",\n \"metadata\": {},\n \"source\": [\n \"#### 2. jax object/numpy object 등이 포함된 식의 gradient를 계산할 수 있다.\\n\",\n \"\\n\",\n \"$\\\\hat y = a_0 * x + a_1 * x^2 + a_2 * x^3$으로 $sin(\\\\pi y)$를 근사할 때의 loss를 다음과 같이 계산할 수 있습니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 3,\n \"id\": \"4868f18f\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"data\": {\n \"text/plain\": [\n \"DeviceArray(4.85457, dtype=float32)\"\n ]\n },\n \"execution_count\": 3,\n \"metadata\": {},\n \"output_type\": \"execute_result\"\n }\n ],\n \"source\": [\n \"@jit\\n\",\n \"def loss(x, y, a):\\n\",\n \" y_hat = a[0] * x + a[1] * (x ** 2) + a[2] * (x ** 3)\\n\",\n \" return ((y_hat - y) ** 2).mean()\\n\",\n \"loss(jx, jy, a)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 4,\n \"id\": \"41b3bb71\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"data\": {\n \"text/plain\": [\n \"DeviceArray([ 0. , -0.00331105, -0.0035851 , -0.00055748,\\n\",\n \" 0.00299592, 0.00380369, 0.00111062, -0.00261639,\\n\",\n \" -0.00394801, -0.00164779, 0.00217986, 0.00401491,\\n\",\n \" 0.00215875, -0.00169356, -0.00400113, -0.00263181], dtype=float32)\"\n ]\n },\n \"execution_count\": 4,\n \"metadata\": {},\n \"output_type\": \"execute_result\"\n }\n ],\n \"source\": [\n \"grads = grad(loss, argnums=[0,2])(jx ,jy, a) # 0번째 argument인 jx에 대한 grad, 2번째 argument인 a에 대한 gradient\\n\",\n \"grads[0] # jx의 gradient\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"71110f57\",\n \"metadata\": {},\n \"source\": [\n \"따라서 다음 식은, 주어진 loss를 최적화하는 방향의 `jx`, `a`의 gradient descent update가 됩니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 5,\n \"id\": \"ece92078\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"lr = 0.5\\n\",\n \"jx -= lr * grads[0]\\n\",\n \"a -= lr * grads[1]\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"53cecce1\",\n \"metadata\": {},\n \"source\": [\n \"#### 3. 간단한 gradient update iterations\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 6,\n \"id\": \"f5095a68\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"name\": \"stdout\",\n \"output_type\": \"stream\",\n \"text\": [\n \"loss: 4.8544683\\n\",\n \"loss: 4.854233\\n\",\n \"loss: 4.8536825\\n\",\n \"loss: 4.852408\\n\",\n \"loss: 4.8494987\\n\",\n \"loss: 4.8429565\\n\",\n \"loss: 4.8284535\\n\",\n \"loss: 4.7968144\\n\",\n \"loss: 4.7290735\\n\",\n \"loss: 4.587598\\n\",\n \"loss: 4.303007\\n\",\n \"loss: 3.7652407\\n\",\n \"loss: 2.8549566\\n\",\n \"loss: 1.5948524\\n\",\n \"loss: 0.4395939\\n\",\n \"loss: 0.043171447\\n\",\n \"loss: 0.005146715\\n\",\n \"loss: 0.0013591682\\n\",\n \"loss: 0.0004096477\\n\",\n \"loss: 0.0001331548\\n\"\n ]\n }\n ],\n \"source\": [\n \"lr = 0.5\\n\",\n \"for i in range(20):\\n\",\n \" print(\\\"loss: \\\", loss(jx, jy, a))\\n\",\n \" grads = grad(loss, argnums=[0,2],)(jx, jy, a) #gradient update\\n\",\n \" jx -= lr * grads[0]\\n\",\n \" a -= lr * grads[1]\\n\",\n \" lr *= 0.98 # weight decay\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"2f33a401\",\n \"metadata\": {},\n \"source\": [\n \"자세한 소개는 를 참고하세요.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 7,\n \"id\": \"fac3c24c\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"import pandas as pd\\n\",\n \"from scipy.sparse import csr_matrix\\n\",\n \"import numpy as np\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"30ee5738\",\n \"metadata\": {},\n \"source\": [\n \"## 전처리한 데이터 읽기\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 8,\n \"id\": \"a6876280\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr = pd.read_csv('./parsed/listen_count.txt', sep=' ', header=None, dtype=str)\\n\",\n \"tr.columns = ['uid', 'sid', 'cnt']\\n\",\n \"tr['cnt'] = tr['cnt']\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"d4988dcb\",\n \"metadata\": {},\n \"source\": [\n \"## user/song id ↔︎ index mapper 생성\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 9,\n \"id\": \"98fc1a4f\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"uid2idx = {_id: i for (i, _id) in enumerate(tr.uid.unique())}\\n\",\n \"sid2idx = {_id: i for (i, _id) in enumerate(tr.sid.unique())}\\n\",\n \"idx2uid = {i: _id for (_id, i) in uid2idx.items()}\\n\",\n \"idx2sid = {i: _id for (_id, i) in sid2idx.items()}\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 10,\n \"id\": \"dfabc6be\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"n_users, n_items = len(uid2idx), len(sid2idx)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 11,\n \"id\": \"827ddd9c\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr['uidx'] = tr.uid.apply(lambda x: uid2idx[x])\\n\",\n \"tr['sidx'] = tr.sid.apply(lambda x: sid2idx[x])\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 12,\n \"id\": \"c8410198\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"with open('./user_id.txt', 'w') as f:\\n\",\n \" print('\\\\n'.join(list(uid2idx)), file=f)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 13,\n \"id\": \"519a6faa\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"X = csr_matrix((tr.cnt, (tr.uidx, tr.sidx)), shape=(n_users, n_items), dtype=np.float32)\\n\",\n \"X.data[:] = 1.0 + np.log(1.0 + X.data[:])\\n\",\n \"jX = jnp.array(X.todense())\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"ad0b2ae1\",\n \"metadata\": {},\n \"source\": [\n \"## 모델 패러미터 선언\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 14,\n \"id\": \"30e9dcd8\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"P = jnp.array(np.random.normal(0, 0.001, size=(n_items, n_items)))\\n\",\n \"P = P.at[jnp.diag_indices(P.shape[0])].set(0)\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"f4e087bc\",\n \"metadata\": {},\n \"source\": [\n \"## AutoEncoder Loss function 정의\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 15,\n \"id\": \"3bbdccdd\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"@jit\\n\",\n \"def loss_fn(X, P):\\n\",\n \" ret = (((X - X @ P) **2).sum() / X.shape[0])\\n\",\n \" ret = ret + 0.01 * (P * P).sum()\\n\",\n \" return ret\\n\",\n \"\\n\",\n \"@jit\\n\",\n \"def loss_fn_with_reg(X, P):\\n\",\n \" ret = loss_fn(X, P)\\n\",\n \" ret = ret + 0.01 * (P * P).sum()\\n\",\n \" return ret \"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"b4fe16ee\",\n \"metadata\": {},\n \"source\": [\n \"## 모델 학습 iteration\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 16,\n \"id\": \"5347798b\",\n \"metadata\": {\n \"scrolled\": true\n },\n \"outputs\": [\n {\n \"name\": \"stdout\",\n \"output_type\": \"stream\",\n \"text\": [\n \"loss 64.004\\n\",\n \"loss 66.449\\n\",\n \"loss 67.097\\n\",\n \"loss 60.643\\n\",\n \"loss 59.344\\n\",\n \"loss 64.691\\n\",\n \"loss 59.441\\n\",\n \"loss 63.911\\n\",\n \"loss 59.402\\n\",\n \"loss 64.654\\n\",\n \"loss 62.120\\n\",\n \"loss 60.031\\n\",\n \"loss 62.357\\n\",\n \"loss 61.753\\n\",\n \"loss 57.506\\n\",\n \"loss 60.258\\n\",\n \"loss 58.754\\n\",\n \"loss 56.311\\n\",\n \"loss 58.182\\n\",\n \"loss 62.481\\n\",\n \"loss 60.810\\n\",\n \"loss 56.708\\n\",\n \"loss 57.245\\n\",\n \"loss 60.673\\n\",\n \"loss 56.572\\n\",\n \"loss 59.373\\n\",\n \"loss 59.507\\n\",\n \"loss 57.597\\n\",\n \"loss 59.925\\n\",\n \"loss 59.495\\n\",\n \"loss 55.814\\n\",\n \"loss 55.230\\n\",\n \"loss 59.792\\n\",\n \"loss 58.578\\n\",\n \"loss 58.576\\n\",\n \"loss 57.569\\n\",\n \"loss 55.163\\n\",\n \"loss 58.808\\n\",\n \"loss 55.075\\n\",\n \"loss 57.480\\n\",\n \"loss 56.844\\n\",\n \"loss 56.501\\n\",\n \"loss 55.325\\n\",\n \"loss 58.603\\n\",\n \"loss 57.383\\n\",\n \"loss 56.497\\n\",\n \"loss 55.732\\n\",\n \"loss 55.738\\n\",\n \"loss 58.511\\n\",\n \"loss 60.045\\n\",\n \"loss 54.302\\n\",\n \"loss 57.139\\n\",\n \"loss 57.217\\n\",\n \"loss 57.407\\n\",\n \"loss 53.654\\n\",\n \"loss 55.838\\n\",\n \"loss 54.236\\n\",\n \"loss 55.657\\n\",\n \"loss 56.574\\n\",\n \"loss 56.752\\n\",\n \"loss 54.039\\n\",\n \"loss 53.840\\n\",\n \"loss 57.588\\n\",\n \"loss 55.948\\n\",\n \"loss 56.433\\n\",\n \"loss 58.417\\n\",\n \"loss 53.072\\n\",\n \"loss 57.674\\n\",\n \"loss 57.769\\n\",\n \"loss 53.164\\n\",\n \"loss 55.655\\n\",\n \"loss 56.704\\n\",\n \"loss 59.374\\n\",\n \"loss 55.299\\n\",\n \"loss 53.946\\n\",\n \"loss 57.615\\n\",\n \"loss 58.426\\n\",\n \"loss 53.965\\n\",\n \"loss 56.668\\n\",\n \"loss 58.578\\n\",\n \"loss 59.542\\n\",\n \"loss 58.564\\n\",\n \"loss 57.424\\n\",\n \"loss 57.376\\n\",\n \"loss 57.319\\n\",\n \"loss 56.014\\n\",\n \"loss 56.321\\n\",\n \"loss 56.480\\n\",\n \"loss 55.599\\n\",\n \"loss 54.096\\n\",\n \"loss 56.425\\n\",\n \"loss 54.798\\n\",\n \"loss 55.761\\n\",\n \"loss 55.811\\n\",\n \"loss 52.461\\n\",\n \"loss 59.287\\n\",\n \"loss 53.293\\n\",\n \"loss 55.951\\n\",\n \"loss 54.867\\n\",\n \"loss 54.828\\n\"\n ]\n }\n ],\n \"source\": [\n \"lr = 0.05\\n\",\n \"for i in range(100):\\n\",\n \" batch = np.random.choice(X.shape[0], 1024)\\n\",\n \" l = loss_fn(jX[batch], P)\\n\",\n \" print(\\\"loss %.3f\\\" % l)\\n\",\n \" r = grad(loss_fn_with_reg, argnums=1)(jX[batch], P)\\n\",\n \" P -= lr * r\\n\",\n \" P = P.at[jnp.diag_indices(P.shape[0])].set(0)\\n\",\n \" lr *= 0.99\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 17,\n \"id\": \"cb170b21\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"scores = np.asarray(X @ P)\\n\",\n \"\\n\",\n \"# 유저가 들은 적이 있는 아이템을 추천에서 제외해 줍니다.\\n\",\n \"scores = np.asarray((scores - X.astype(bool).astype(int) * 10000))\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"9855859e\",\n \"metadata\": {},\n \"source\": [\n \"## 아이템 선택\\n\",\n \"\\n\",\n \"score가 높은 top 100개 아이템을 선택해줍니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 18,\n \"id\": \"1d218c77\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"top_reco = (-scores).argsort(-1)[:, :100]\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"6429b6d2\",\n \"metadata\": {},\n \"source\": [\n \"## 추천 생성 후 저장\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 19,\n \"id\": \"fb7fdf46\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"ret = []\\n\",\n \"for idx, rec_list in enumerate(top_reco):\\n\",\n \" uid = idx2uid[idx]\\n\",\n \" rec_sids = [str(idx2sid[sidx]) for sidx in rec_list]\\n\",\n \" ret.append(\\\"%s \\\" % uid + ' '.join(rec_sids))\\n\",\n \"with open('./parsed/rec_result.txt', 'w') as f:\\n\",\n \" for w in ret:\\n\",\n \" print(w, file=f)\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"7bec8d62\",\n \"metadata\": {},\n \"source\": [\n \"저장된 추천 결과, 그리고 테스트 데이터를 dictionary 형태로 읽어옵니다.\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 20,\n \"id\": \"4980fcdb\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"def load_res(fname):\\n\",\n \" ret = {}\\n\",\n \" with open(fname, 'r') as f:\\n\",\n \" for l in f:\\n\",\n \" l = l.strip().split()\\n\",\n \" uid, sids = l[0], l[1:]\\n\",\n \" ret[uid] = sids\\n\",\n \" return ret\\n\",\n \"\\n\",\n \"recs = load_res('./parsed/rec_result.txt')\\n\",\n \"gt = load_res('./parsed/TEST_DATA.txt')\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 21,\n \"id\": \"bc1cc380\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"import math\\n\",\n \"def ndcg(recs, gt):\\n\",\n \" Q, S = 0.0, 0.0\\n\",\n \" for u, vs in gt.items():\\n\",\n \" rec = recs.get(u, [])\\n\",\n \" if not rec:\\n\",\n \" continue\\n\",\n \"\\n\",\n \" idcg = sum([1.0 / math.log(i + 2, 2) for i in range(len(vs))])\\n\",\n \" dcg = 0.0\\n\",\n \" for i, r in enumerate(rec):\\n\",\n \" if r not in vs:\\n\",\n \" continue\\n\",\n \" rank = i + 1\\n\",\n \" dcg += 1.0 / math.log(rank + 1, 2)\\n\",\n \" ndcg = dcg / idcg\\n\",\n \" S += ndcg\\n\",\n \" Q += 1\\n\",\n \" return S / Q\\n\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 22,\n \"id\": \"f8c20670\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"data\": {\n \"text/plain\": [\n \"0.25222175220674803\"\n ]\n },\n \"execution_count\": 22,\n \"metadata\": {},\n \"output_type\": \"execute_result\"\n }\n ],\n \"source\": [\n \"ndcg(recs, gt)\"\n ]\n }\n ],\n \"metadata\": {\n \"kernelspec\": {\n \"display_name\": \"Python 3 (ipykernel)\",\n \"language\": \"python\",\n \"name\": \"python3\"\n },\n \"language_info\": {\n \"codemirror_mode\": {\n \"name\": \"ipython\",\n \"version\": 3\n },\n \"file_extension\": \".py\",\n \"mimetype\": \"text/x-python\",\n \"name\": \"python\",\n \"nbconvert_exporter\": \"python\",\n \"pygments_lexer\": \"ipython3\",\n \"version\": \"3.9.7\"\n },\n \"vscode\": {\n \"interpreter\": {\n \"hash\": \"1c0b93efeafdf3e6d99eb605273d97a0510dd9f2bbdf91a9dec5466ed68b0be9\"\n }\n }\n },\n \"nbformat\": 4,\n \"nbformat_minor\": 5\n}\n" }, { "path": "programming_assignments/jukebox/solution/2-2. EASE^R.ipynb", "content": "{\n \"cells\": [\n {\n \"cell_type\": \"code\",\n \"execution_count\": 24,\n \"id\": \"3c0dbaaf\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"import pandas as pd\\n\",\n \"from scipy.sparse import csr_matrix\\n\",\n \"from sklearn.utils import shuffle\\n\",\n \"import numpy as np\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 26,\n \"id\": \"a6876280\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr = pd.read_csv('./parsed/listen_count.txt', sep=' ', header=None, dtype=str)\\n\",\n \"tr.columns = ['uid', 'sid', 'cnt']\\n\",\n \"tr['cnt'] = tr['cnt']\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 27,\n \"id\": \"98fc1a4f\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"uid2idx = {_id: i for (i, _id) in enumerate(tr.uid.unique())}\\n\",\n \"sid2idx = {_id: i for (i, _id) in enumerate(tr.sid.unique())}\\n\",\n \"idx2uid = {i: _id for (_id, i) in uid2idx.items()}\\n\",\n \"idx2sid = {i: _id for (_id, i) in sid2idx.items()}\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 28,\n \"id\": \"dfabc6be\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"n_user, n_item = len(uid2idx), len(sid2idx)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 29,\n \"id\": \"827ddd9c\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr['uidx'] = tr.uid.apply(lambda x: uid2idx[x])\\n\",\n \"tr['sidx'] = tr.sid.apply(lambda x: sid2idx[x])\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 59,\n \"id\": \"c8410198\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"with open('./user_id.txt', 'w') as f:\\n\",\n \" print('\\\\n'.join(tr.uid.tolist()), file=f)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 30,\n \"id\": \"8486d1ea\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"vali_list = val.groupby('uidx').sidx.apply(list).reset_index()\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 31,\n \"id\": \"519a6faa\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"X = csr_matrix((tr.cnt, (tr.uidx, tr.sidx)), shape=(n_user, n_item), dtype=np.float32)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 32,\n \"id\": \"1750a1b5\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"X.data[:] = 1.0 + np.log(1.0 + X.data[:])\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 33,\n \"id\": \"bb224ab9\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"def gen_top_reco(X, lamb=10.0):\\n\",\n \" G = (X.T @ X).toarray()\\n\",\n \" diags = np.diag_indices(G.shape[0])\\n\",\n \" G[diags] += lamb\\n\",\n \" P = np.linalg.inv(G)\\n\",\n \" B = P / -np.diag(P)\\n\",\n \" scores = X @ B\\n\",\n \" scores = np.asarray((scores - X.astype(bool).astype(int) * 10000))\\n\",\n \" top_reco = (-scores).argsort(-1)[:, :100]\\n\",\n \" return top_reco\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 44,\n \"id\": \"287e0468\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"top_reco = gen_top_reco(X, lamb=30.0)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 45,\n \"id\": \"fb7fdf46\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"ret = []\\n\",\n \"for idx, rec_list in enumerate(top_reco):\\n\",\n \" uid = idx2uid[idx]\\n\",\n \" rec_sids = [str(idx2sid[sidx]) for sidx in rec_list]\\n\",\n \" ret.append(\\\"%s \\\" % uid + ' '.join(rec_sids))\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 46,\n \"id\": \"b4db5269\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"with open('./parsed/rec_result.txt', 'w') as f:\\n\",\n \" for w in ret:\\n\",\n \" print(w, file=f)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 48,\n \"id\": \"4980fcdb\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"def load_res(fname):\\n\",\n \" ret = {}\\n\",\n \" with open(fname, 'r') as f:\\n\",\n \" for l in f:\\n\",\n \" l = l.strip().split()\\n\",\n \" uid, sids = l[0], l[1:]\\n\",\n \" ret[uid] = sids\\n\",\n \" return ret\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 49,\n \"id\": \"785afcd8\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"recs = load_res('./parsed/rec_result.txt')\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 50,\n \"id\": \"63582e44\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"gt = load_res('./parsed/TEST_DATA.txt')\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 51,\n \"id\": \"bc1cc380\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"import math\\n\",\n \"def ndcg(recs, gt):\\n\",\n \" Q, S = 0.0, 0.0\\n\",\n \" for u, vs in gt.items():\\n\",\n \" rec = recs.get(u, [])\\n\",\n \" if not rec:\\n\",\n \" continue\\n\",\n \"\\n\",\n \" idcg = sum([1.0 / math.log(i + 2, 2) for i in range(len(vs))])\\n\",\n \" dcg = 0.0\\n\",\n \" for i, r in enumerate(rec):\\n\",\n \" if r not in vs:\\n\",\n \" continue\\n\",\n \" rank = i + 1\\n\",\n \" dcg += 1.0 / math.log(rank + 1, 2)\\n\",\n \" ndcg = dcg / idcg\\n\",\n \" S += ndcg\\n\",\n \" Q += 1\\n\",\n \" return S / Q\\n\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 52,\n \"id\": \"f8c20670\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"data\": {\n \"text/plain\": [\n \"0.2559553152855044\"\n ]\n },\n \"execution_count\": 52,\n \"metadata\": {},\n \"output_type\": \"execute_result\"\n }\n ],\n \"source\": [\n \"ndcg(recs, gt)\"\n ]\n }\n ],\n \"metadata\": {\n \"kernelspec\": {\n \"display_name\": \"Python 3 (ipykernel)\",\n \"language\": \"python\",\n \"name\": \"python3\"\n },\n \"language_info\": {\n \"codemirror_mode\": {\n \"name\": \"ipython\",\n \"version\": 3\n },\n \"file_extension\": \".py\",\n \"mimetype\": \"text/x-python\",\n \"name\": \"python\",\n \"nbconvert_exporter\": \"python\",\n \"pygments_lexer\": \"ipython3\",\n \"version\": \"3.9.7\"\n },\n \"vscode\": {\n \"interpreter\": {\n \"hash\": \"1c0b93efeafdf3e6d99eb605273d97a0510dd9f2bbdf91a9dec5466ed68b0be9\"\n }\n }\n },\n \"nbformat\": 4,\n \"nbformat_minor\": 5\n}\n" }, { "path": "programming_assignments/jukebox/solution/3. (optional) Implicit을 이용한 Jukebox 풀이.ipynb", "content": "{\n \"cells\": [\n {\n \"cell_type\": \"markdown\",\n \"id\": \"4c1dbc84\",\n \"metadata\": {},\n \"source\": [\n \"# Matrix Factorization 라이브러리인 Implicit을 이용한 Jukebox 풀이\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 1,\n \"id\": \"92eb00a1\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"import pandas as pd\\n\",\n \"from scipy.sparse import csr_matrix\\n\",\n \"import numpy as np\\n\",\n \"from implicit.als import AlternatingLeastSquares as ALS\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 2,\n \"id\": \"a6876280\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr = pd.read_csv('./parsed/listen_count.txt', sep=' ', header=None, dtype=str)\\n\",\n \"tr.columns = ['uid', 'sid', 'cnt']\\n\",\n \"tr['cnt'] = tr['cnt']\"\n ]\n },\n {\n \"cell_type\": \"markdown\",\n \"id\": \"81bd8e98\",\n \"metadata\": {},\n \"source\": [\n \"## user/song id ↔︎ index mapper 생성\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 3,\n \"id\": \"98fc1a4f\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"uid2idx = {_id: i for (i, _id) in enumerate(tr.uid.unique())}\\n\",\n \"sid2idx = {_id: i for (i, _id) in enumerate(tr.sid.unique())}\\n\",\n \"idx2uid = {i: _id for (_id, i) in uid2idx.items()}\\n\",\n \"idx2sid = {i: _id for (_id, i) in sid2idx.items()}\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 4,\n \"id\": \"dfabc6be\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"n_users, n_items = len(uid2idx), len(sid2idx)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 5,\n \"id\": \"827ddd9c\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"tr['uidx'] = tr.uid.apply(lambda x: uid2idx[x])\\n\",\n \"tr['sidx'] = tr.sid.apply(lambda x: sid2idx[x])\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 6,\n \"id\": \"c8410198\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"with open('./user_id.txt', 'w') as f:\\n\",\n \" print('\\\\n'.join(list(uid2idx)), file=f)\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 7,\n \"id\": \"519a6faa\",\n \"metadata\": {},\n \"outputs\": [],\n \"source\": [\n \"X = csr_matrix((tr.cnt, (tr.uidx, tr.sidx)), shape=(n_users, n_items), dtype=np.float32)\\n\",\n \"X.data[:] = 1.0 + np.log(1.0 + X.data[:])\"\n ]\n },\n {\n \"cell_type\": \"code\",\n \"execution_count\": 8,\n \"id\": \"b6b436f8\",\n \"metadata\": {},\n \"outputs\": [\n {\n \"data\": {\n \"application/vnd.jupyter.widget-view+json\": {\n \"model_id\": \"75e14414e65e4ac38a52f4df4632ac15\",\n \"version_major\": 2,\n \"version_minor\": 0\n },\n \"text/plain\": [\n \" 0%| | 0/15 [00:00 0:\n S += 1.0 / min_rank\n if Q > 0:\n # print 'S=%f' % S\n # print 'Q=%f' % Q\n # print '%.10f' % (S / Q)\n return S / Q\n\n @staticmethod\n def map(recs, db):\n Q = 0\n S = 0\n for u, vs in db.items():\n N = len(vs)\n Hit = 0\n SS = 0\n set_v = set(vs.keys())\n rec = recs.get(u, [])\n for idx, r in enumerate(rec):\n if r[0] in set_v:\n Hit += 1\n SS += (Hit / float(idx + 1))\n SS = SS / float(N)\n S += SS\n Q += 1\n if Q > 0:\n # print 'S=%f' % S\n # print 'Q=%f' % Q\n # print '%.10f' % (S / Q)\n return S / Q\n\n @staticmethod\n def auc(recs, db, num_total_cand):\n Q = 0.0\n S = 0.0\n for u, vs in db.items():\n Q += 1\n\n rec = recs.get(u, [])\n\n num_dropped_items = num_total_cand - len(rec)\n num_rel_items = len([1 for r in rec if r[0] in vs])\n num_eval_items = num_total_cand\n num_eval_pairs = (num_eval_items - num_rel_items) * num_rel_items\n if num_eval_pairs == 0:\n S += 0.5\n continue\n\n num_correct_pairs = 0\n hit_count = 0\n for r in rec:\n if r[0] not in vs:\n num_correct_pairs += hit_count\n else:\n hit_count += 1\n\n num_missing_rel_items = len(vs) - num_rel_items\n num_correct_pairs += (hit_count * (num_dropped_items - num_missing_rel_items))\n S += float(num_correct_pairs) / float(num_eval_pairs)\n return S / Q\n\n @staticmethod\n def ndcg(recs, db):\n Q = 0.0\n S = 0.0\n for u, vs in db.items():\n\n rec = recs.get(u, [])\n if not rec:\n continue\n\n idcg = sum([1.0 / math.log(i + 2, 2) for i in range(len(vs))])\n dcg = 0.0\n for i, r in enumerate(rec):\n if r not in vs:\n continue\n rank = i + 1\n dcg += 1.0 / math.log(rank + 1, 2)\n ndcg = dcg / idcg\n S += ndcg\n Q += 1\n return S / Q\n\n\nclass Evaluation:\n def __init__(self):\n self.logger = logging.getLogger(self.__class__.__name__)\n self.logger.setLevel(logging.DEBUG)\n\n sh = logging.StreamHandler()\n sh.setLevel(logging.DEBUG)\n formatter = logging.Formatter('[%(levelname)-8s] %(asctime)s [%(filename)s] [%(funcName)s:%(lineno)d] %(message)s', '%Y-%m-%d %H:%M:%S')\n sh.setFormatter(formatter)\n self.logger.addHandler(sh)\n\n fh = logging.FileHandler(self.__class__.__name__ + '.log')\n fh.setLevel(logging.DEBUG)\n formatter = logging.Formatter('[%(levelname)-8s] %(asctime)s [%(filename)s] [%(funcName)s:%(lineno)d] %(message)s', '%Y-%m-%d %H:%M:%S')\n fh.setFormatter(formatter)\n self.logger.addHandler(fh)\n\n def load_database(self, fname_target_users, fname_database, has_header=False):\n self.logger.info('Loading database -> %s' % fname_database)\n self.target_users = None\n if fname_target_users:\n self.target_users = set(map(int, open(fname_target_users)))\n\n data = ''\n fin = open(fname_database)\n while True:\n line = fin.readline()\n if line[0] == '#':\n continue\n data += line\n break\n\n if has_header:\n fin.readline()\n\n data += fin.read()\n\n tokenizer = re.compile('([^ \\n]+)')\n\n self.db = {}\n tokens = tokenizer.findall(data)\n it = iter(tokens)\n for u, i, s in zip(it, it, it):\n u, i, s = int(u), int(i), float(s)\n\n if self.target_users and u not in self.target_users:\n continue\n\n if u not in self.db:\n self.db[u] = {}\n\n self.db[u][i] = s\n\n def load_test_file(self, fpath, has_header=True):\n self.logger.info('Loading database -> %s' % fpath)\n with open(fpath) as f:\n if has_header:\n f.readline()\n header = f.readline().rstrip().split(\" \")\n max_uid, max_iid, num_line = map(int, header)\n td = {}\n for line in f:\n uid, iid, r = line.split(\" \")\n r = float(r)\n if r > 3.0:\n td.setdefault(uid, set()).add(iid)\n return td\n\n def load_topk_file(self, fpath):\n self.logger.info('Loading topk file -> %s' % fpath)\n with open(fpath) as f:\n topk = {}\n num_line = 0\n for line in f:\n num_line += 1\n item = line.strip().split(\" \")\n if len(item) == 0 or not item[0].isdigit():\n print(\"error %d\" % num_line)\n # item = map(int, item)\n topk[item[0]] = item[1:]\n return topk\n\n def eval_topk(self, topk, td, metrics=[]):\n self.logger.info('Start evalution')\n\n scores = []\n if 'mrr' in metrics:\n self.logger.info('[MRR]')\n mrr = Metric.mrr(topk, td)\n self.logger.info('MRR: %.10f' % mrr)\n scores.append(mrr)\n\n if 'map' in metrics:\n self.logger.info('[MAP]')\n _map = Metric.map(topk, td)\n self.logger.info('MAP: %.10f' % _map)\n scores.append(_map)\n\n if 'auc' in metrics:\n self.logger.info('[AUC]')\n self.logger.info('NUM_RECOMMENDATION_CANDIDATES: %d' % NUM_ITEMS)\n auc = Metric.auc(topk, td, NUM_ITEMS)\n self.logger.info('AUC: %.10f' % auc)\n scores.append(auc)\n\n if 'ndcg' in metrics:\n self.logger.info('[NDCG]')\n ndcg = Metric.ndcg(topk, td)\n self.logger.info('NDCG: %.10f' % ndcg)\n scores.append(ndcg)\n\n self.logger.info('| ' + (' | '.join(['%.10f' % s for s in scores])) + ' |')\n\nif __name__ == '__main__':\n if len(sys.argv) != 3:\n print('python', sys.argv[0], '', '')\n sys.exit()\n test_fname = sys.argv[1]\n topk_fname = sys.argv[2]\n e = Evaluation()\n test_data = e.load_test_file(test_fname, has_header=False)\n print(len(test_data))\n topk = e.load_topk_file(topk_fname)\n e.eval_topk(topk, test_data, ['ndcg'])\n" }, { "path": "programming_assignments/jukebox/solution/code_using_ease/evaluation/user_id.txt", "content": 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}, { "path": "programming_assignments/jukebox/solution/code_using_ease/evaluation/validation_data.txt", "content": "1303 103 11\n5618 1249 9\n4193 2352 1\n18215 6150 1\n8848 1734 1\n11929 505 1\n6342 6546 1\n8375 4245 1\n1765 5820 1\n19127 1740 1\n8052 7089 1\n8623 1251 6\n4615 520 1\n10396 6541 4\n13864 665 1\n10151 2668 1\n19228 6184 1\n1047 1740 1\n2629 1771 2\n2495 3511 1\n12717 518 3\n863 6029 1\n4859 1146 2\n352 3445 1\n17833 643 1\n467 3798 2\n17911 706 3\n8801 3216 1\n19606 1475 1\n1746 601 1\n14104 1755 1\n18070 390 1\n1029 2352 1\n18919 2488 1\n1289 3698 1\n18262 6150 1\n12534 5291 1\n4734 1282 1\n1305 834 1\n11325 221 3\n15495 1764 1\n4345 8029 2\n566 1695 4\n3153 534 1\n6477 229 6\n14236 4665 1\n5606 167 1\n1518 910 2\n7484 3414 4\n18070 526 5\n1765 132 1\n11281 1762 2\n3775 206 1\n11702 1116 1\n20193 5306 1\n5963 193 4\n9011 6758 12\n16364 5144 3\n4061 1548 1\n3220 6069 1\n2629 2662 1\n10139 4314 1\n13234 1312 1\n1665 5048 1\n11121 1328 1\n910 2093 6\n13024 3411 3\n14183 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1\n17738 3352 1\n7838 877 1\n10393 7407 27\n10153 3464 3\n4615 205 2\n16183 1775 17\n283 6322 8\n12534 364 7\n7966 7791 1\n6036 7466 1\n3940 764 1\n6307 1395 9\n1850 35 1\n18705 1778 1\n3940 177 2\n2756 1211 1\n3153 252 1\n8375 709 1\n6307 7427 1\n11702 2494 1\n18582 2353 2\n16926 956 1\n4241 5649 1\n6261 1421 1\n4615 1825 29\n306 2353 3\n8377 385 4\n3573 2556 14\n467 7259 3\n6995 1825 1\n12157 7593 1\n13620 3059 4\n13792 214 1\n4061 1466 1\n15814 2276 1\n14236 3460 1\n542 2508 1\n10396 2600 1\n19205 4623 2\n14755 6540 5\n11124 5077 1\n14755 6545 1\n6304 2261 1\n2278 742 8\n14109 1762 3\n19007 1664 1\n352 225 8\n16364 6260 1\n20056 1361 1\n15791 2626 3\n17738 910 2\n5963 3635 1\n3752 5308 2\n20193 7727 1\n10896 7921 1\n6511 7232 3\n52 2550 1\n16269 2276 2\n14236 4670 1\n18705 232 1\n13350 512 2\n12494 1775 1\n7708 1053 1\n1765 190 1\n15725 1244 1\n3617 7401 4\n7211 2646 1\n5596 235 2\n18416 6064 2\n13112 1762 2\n5596 723 1\n14519 2175 1\n910 4988 1\n7414 4506 1\n3573 7410 1\n3617 1775 2\n1765 134 1\n467 5252 1\n17536 1146 4\n11796 765 1\n17311 753 1\n7802 2737 2\n15169 4944 1\n6240 2913 1\n13710 495 1\n4061 173 1\n12339 1761 5\n6221 2697 4\n10955 1363 5\n17778 447 1\n9219 1747 1\n2499 221 1\n2419 500 3\n13234 7769 2\n1029 719 2\n15495 1238 3\n4124 2552 2\n8654 6555 3\n8035 6711 3\n19111 1342 1\n18411 2147 1\n12945 3952 2\n15169 1772 1\n6304 1742 2\n14768 2838 1\n2387 214 6\n20272 4304 1\n12355 6278 2\n15791 4403 2\n13234 1249 2\n6925 2480 1\n13234 4447 8\n4734 1695 1\n8884 645 1\n17311 7663 1\n7966 193 1\n5731 219 1\n19878 6225 14\n1029 1743 1\n3646 207 4\n6205 7586 1\n8763 225 1\n14385 545 9\n9581 545 7\n14540 1236 1\n19205 502 7\n10811 244 1\n7721 8017 3\n6219 4803 2\n16364 4299 1\n6502 7332 1\n11141 8141 2\n1029 1250 2\n542 5418 1\n18561 2721 1\n6749 6994 1\n7543 1756 1\n1109 186 1\n11796 877 1\n7966 834 1\n17778 1658 1\n17246 244 7\n14755 6577 2\n1207 1774 2\n6749 535 1\n13190 96 3\n9670 7529 2\n20112 201 4\n4615 2251 1\n17381 2617 5\n16033 1548 1\n5125 438 1\n6290 508 5\n13421 3931 1\n11278 1990 1\n18561 7701 4\n14768 8196 1\n2383 252 1\n19839 3911 14\n10111 4246 5\n19273 3588 6\n1128 233 1\n15618 7857 3\n11918 206 11\n18262 1770 1\n6221 3298 1\n13012 215 1\n15618 676 1\n6511 512 7\n8561 1715 1\n13003 1241 11\n11155 4796 5\n8844 5794 1\n16468 447 1\n1029 1248 2\n5282 3253 1\n4859 1296 3\n1606 935 1\n10396 6606 3\n13885 4963 4\n5552 2355 2\n2589 6484 2\n4193 23 4\n20193 3596 3\n14720 520 1\n1518 2087 1\n13234 3564 1\n5383 187 2\n14504 200 47\n18323 1242 5\n15791 3367 3\n7966 6541 1\n372 3511 1\n3082 207 1\n3214 6753 2\n13091 5004 1\n2629 471 2\n2183 221 1\n17911 4206 1\n16132 765 1\n1518 6231 1\n10459 1377 3\n978 7178 1\n17778 1307 1\n14604 2353 1\n14913 2737 5\n52 2533 4\n542 1378 1\n5963 244 3\n6221 7738 1\n8654 508 3\n863 650 1\n11796 5286 1\n4180 6028 2\n1665 2727 1\n6502 5408 1\n19892 2790 1\n19208 524 1\n6511 225 1\n3116 1990 4\n4124 6170 1\n2725 690 1\n11278 5719 1\n20236 5269 2\n7966 229 1\n11155 1762 7\n13234 203 5\n3229 303 2\n1090 1154 1\n7199 4695 1\n11155 215 6\n5963 225 4\n3445 3669 21\n14361 3230 3\n2278 7719 5\n283 2401 2\n2936 3820 1\n9450 7809 2\n8586 685 1\n2754 7174 1\n8052 5409 1\n11364 5736 1\n16364 214 2\n19530 5971 1\n13234 1374 2\n11702 1277 3\n15564 724 13\n11702 7878 1\n2629 1395 1\n3486 2708 2\n7484 7101 2\n2756 5922 2\n542 5495 1\n14519 1955 7\n16637 1826 1\n19145 4243 1\n1109 3230 1\n1414 7958 1\n15814 4540 1\n1606 3411 1\n3025 1717 2\n7708 370 1\n6502 224 1\n10396 3970 1\n566 5943 1\n9670 1732 2\n4769 2561 1\n2473 906 2\n978 6588 1\n16364 1036 6\n17023 626 2\n10393 2678 1\n1090 4304 1\n18656 3863 1\n1665 1191 1\n12639 207 2\n4180 844 8\n14109 732 1\n9469 7255 2\n8763 398 1\n4383 530 2\n1665 6902 1\n4859 46 7\n2499 5077 1\n6749 1779 3\n6342 201 3\n13024 3378 1\n16289 5513 1\n13885 1762 3\n5348 500 1\n1109 1825 2\n1109 3699 2\n1128 221 1\n8074 512 2\n17289 3485 1\n8763 5446 2\n16468 6924 1\n11121 2697 1\n19273 8026 3\n17987 2324 3\n13350 4477 1\n3573 5060 2\n4899 6053 4\n19127 3512 1\n3542 1819 2\n10828 3492 4\n5963 1334 1\n19207 2675 1\n2084 1909 1\n5963 372 1\n6654 8190 1\n20272 2103 1\n3025 1342 1\n7219 6488 1\n16468 2445 1\n5731 4026 1\n15618 6011 1\n863 3382 1\n2473 5187 1\n12945 8139 4\n365 3869 2\n17246 23 1\n2463 200 12\n1970 1235 3\n17536 1395 2\n6323 1615 2\n17738 3398 1\n12717 1768 2\n9450 1722 2\n18705 1482 2\n11536 1819 1\n467 3827 2\n17459 939 1\n11432 4704 1\n4859 203 4\n15152 274 2\n14504 2522 2\n2629 411 1\n7015 173 2\n6442 201 1\n19530 1249 1\n8689 1686 2\n6613 411 5\n1822 5910 1\n15539 2549 2\n11121 1298 2\n6749 8083 2\n19071 7216 3\n17575 381 1\n11702 4112 1\n11141 6469 2\n2383 1762 1\n18262 1238 2\n7414 4566 1\n19751 1356 5\n8654 2363 5\n1822 5043 6\n17911 499 5\n9670 4314 5\n13792 675 12\n5963 526 2\n14519 4355 9\n19961 3325 1\n2271 5945 1\n19407 203 1\n18070 13 2\n4859 2668 1\n11325 498 2\n6334 48 1\n18561 7953 1\n6749 3005 1\n2271 3395 1\n9240 1713 1\n10393 470 34\n2629 215 5\n19071 4314 3\n16959 8026 12\n18705 1239 1\n6033 2671 1\n19892 4107 1\n6323 7125 1\n16480 1738 1\n5596 1464 1\n19118 190 3\n5348 5325 1\n8046 7734 39\n7721 292 1\n19273 771 1\n7802 1698 1\n17023 579 1\n2629 891 3\n3214 23 12\n16089 496 1\n14236 6892 1\n2271 363 1\n11459 1819 4\n2918 1718 2\n11155 2646 6\n11121 5996 3\n14385 1764 2\n7838 3597 2\n10111 378 1\n542 712 1\n14127 95 1\n6511 1374 5\n5128 8183 20\n576 1249 1\n9904 1739 8\n1014 6424 1\n4859 1184 1\n3116 6238 1\n7708 428 1\n19892 4231 1\n6342 206 1\n1970 215 1\n14127 6817 1\n17778 3283 1\n10715 647 5\n1822 3207 6\n6323 3510 1\n102 184 1\n16322 6072 1\n18374 2885 41\n3082 23 18\n19530 3638 2\n12026 3689 4\n13024 652 5\n6349 6139 1\n6511 252 3\n3542 215 1\n16258 1755 1\n8669 4435 3\n19839 1239 2\n1047 327 1\n19384 688 1\n8654 3625 6\n1905 420 2\n9594 1783 7\n13091 1824 2\n2725 6014 5\n13657 6053 1\n1822 1960 3\n20154 7878 10\n542 6622 2\n7838 575 1\n13234 1732 2\n16964 3142 1\n3176 4849 13\n12499 1721 1\n1207 7895 1\n9654 1305 7\n1822 7674 1\n566 397 6\n19007 2662 1\n18656 4337 1\n342 200 1\n11155 34 2\n863 3840 3\n16506 1829 15\n6974 1395 1\n8844 1276 1\n17911 550 1\n13091 3012 8\n11310 6536 3\n15725 3889 6\n6033 1695 2\n1029 2662 1\n10828 1909 4\n1905 5887 1\n14755 7022 1\n17738 310 1\n16995 2795 1\n14720 2646 2\n1518 506 5\n4734 5526 1\n8654 541 3\n20154 1184 97\n15495 506 1\n542 5502 1\n5640 1768 2\n15791 888 1\n17738 304 4\n16089 303 1\n5282 1688 1\n6036 3138 1\n17738 2912 1\n14504 1819 9\n16377 3252 4\n3025 244 1\n863 873 1\n9581 4204 18\n6749 7054 1\n17448 4517 1\n10111 659 1\n8884 1247 1\n15791 579 5\n1970 1464 1\n11632 3311 1\n15791 1251 1\n15781 952 1\n12717 7245 6\n4615 229 2\n12296 57 1\n11929 1332 1\n12296 7716 1\n3353 6888 1\n936 1706 5\n2473 1285 1\n5596 220 6\n914 232 1\n13864 263 3\n18705 520 1\n7199 3686 9\n11529 1703 1\n129 1164 2\n1090 2562 2\n18416 46 2\n8105 5860 1\n1109 6638 1\n17911 4511 4\n8074 1732 1\n16132 665 1\n10393 497 1\n6261 99 1\n1665 5129 2\n7219 6527 1\n6290 214 7\n3025 496 1\n16041 1718 1\n8884 926 1\n5606 23 2\n16926 4015 1\n1090 422 2\n7 226 11\n3940 967 1\n6749 7112 1\n19878 222 7\n5640 1738 1\n10458 3595 1\n37 2016 1\n7838 642 1\n17575 611 1\n5552 215 1\n542 545 1\n2271 379 1\n8092 2021 1\n17448 4514 5\n2387 215 8\n4124 162 5\n7523 5413 1\n5383 274 1\n11702 8036 1\n8654 214 3\n576 1734 1\n10393 3593 1\n4061 1772 1\n6307 1245 1\n15100 3530 5\n1109 1924 1\n16089 200 6\n14385 3643 21\n15495 1253 4\n6561 2649 1\n12499 3973 1\n5543 5018 1\n3852 3591 2\n705 2261 1\n17833 5312 1\n75 3493 3\n69 3273 1\n15379 673 2\n910 2087 1\n4139 878 1\n6995 411 1\n1029 1775 1\n19961 2176 1\n2585 4963 1\n6205 200 1\n6261 1401 1\n1047 1251 1\n1090 823 3\n16033 6748 1\n19630 3671 3\n7195 5052 1\n10111 6430 1\n103 4640 7\n17459 646 1\n409 3445 1\n13792 5017 15\n3220 1655 1\n2918 4967 1\n15791 3626 1\n6385 3697 3\n8208 2499 2\n12339 943 2\n17778 1380 1\n6654 5442 3\n13792 4833 1\n2495 103 1\n1087 3596 2\n4505 5903 1\n2271 1042 1\n15379 3576 3\n8552 1763 1\n16183 1342 17\n2401 23 1\n" }, { "path": "programming_assignments/jukebox/solution/code_using_ease/recommend_with_ease.py", "content": "import pandas as pd\nfrom scipy.sparse import csr_matrix\nimport numpy as np\nimport sys\n\n\ndef gen_top_reco(X, lamb=10.0, K=100, target_user_inds=None):\n G = (X.T @ X).toarray()\n diags = np.diag_indices(G.shape[0])\n G[diags] += lamb\n P = np.linalg.inv(G)\n B = P / -np.diag(P)\n _X = X\n if target_user_inds is not None:\n _X = X[target_user_inds, :]\n scores = _X @ B\n scores = np.asarray((scores - _X.astype(bool).astype(int) * 10000))\n top_reco = (-scores).argsort(-1)[:, :K]\n return top_reco\n\n\nlisten_count_fname, user_ids_fname, K = sys.argv[1], sys.argv[2], int(sys.argv[3])\n\nwith open(user_ids_fname, 'r') as f:\n target_user_ids = f.read().strip().split()\ntr = pd.read_csv(listen_count_fname, sep=' ', header=None, dtype=str)\ntr.columns = ['uid', 'sid', 'cnt']\ntr['cnt'] = tr['cnt']\nuid2idx = {_id: i for (i, _id) in enumerate(tr.uid.unique())}\nsid2idx = {_id: i for (i, _id) in enumerate(tr.sid.unique())}\nidx2uid = {i: _id for (_id, i) in uid2idx.items()}\nidx2sid = {i: _id for (_id, i) in sid2idx.items()}\ntr['uidx'] = tr.uid.apply(lambda x: uid2idx[x])\ntr['sidx'] = tr.sid.apply(lambda x: sid2idx[x])\nn_user, n_item = len(uid2idx), len(sid2idx)\nwith open('./user_id.txt', 'w') as f:\n print('\\n'.join(tr.uid.tolist()), file=f)\n\nX = csr_matrix((tr.cnt, (tr.uidx, tr.sidx)),\n shape=(n_user, n_item),\n dtype=np.float32)\nX.data[:] = 1.0 + np.log(1.0 + X.data[:])\n\ntarget_user_inds = [uid2idx[uid] for uid in target_user_ids]\ntop_reco = gen_top_reco(X, lamb=30.0, K=K,\n target_user_inds=target_user_inds)\n\nfor uid, rec_list in zip(target_user_ids, top_reco):\n rec_sids = [str(idx2sid[sidx]) for sidx in rec_list]\n print(uid, ' '.join(rec_sids))\n" }, { "path": "programming_assignments/jukebox/solution/code_using_ease/recommend_with_sgd.py", "content": "import pandas as pd\nfrom scipy.sparse import csr_matrix\nimport numpy as np\nfrom jax import grad, jit\nimport jax.numpy as jnp\n\nimport sys\n\n\nlisten_count_fname, user_ids_fname, K = sys.argv[1], sys.argv[2], int(sys.argv[3])\n\nwith open(user_ids_fname, 'r') as f:\n target_user_ids = f.read().strip().split()\ntr = pd.read_csv(listen_count_fname, sep=' ', header=None, dtype=str)\ntr.columns = ['uid', 'sid', 'cnt']\ntr['cnt'] = tr['cnt']\nuid2idx = {_id: i for (i, _id) in enumerate(tr.uid.unique())}\nsid2idx = {_id: i for (i, _id) in enumerate(tr.sid.unique())}\nidx2uid = {i: _id for (_id, i) in uid2idx.items()}\nidx2sid = {i: _id for (_id, i) in sid2idx.items()}\ntr['uidx'] = tr.uid.apply(lambda x: uid2idx[x])\ntr['sidx'] = tr.sid.apply(lambda x: sid2idx[x])\nn_user, n_item = len(uid2idx), len(sid2idx)\nwith open('./user_id.txt', 'w') as f:\n print('\\n'.join(tr.uid.unique()), file=f)\n\nX = csr_matrix((tr.cnt, (tr.uidx, tr.sidx)),\n shape=(n_user, n_item),\n dtype=np.float32)\nX.data[:] = 1.0 + np.log(1.0 + X.data[:])\n\njX = jnp.array(X.todense())\nP = jnp.array(np.random.normal(0, 0.001, size=(n_item, n_item)))\nP = P.at[jnp.diag_indices(P.shape[0])].set(0)\n\n\n@jit\ndef loss_fn(X, P):\n ret = (((X - X @ P) **2).sum() / X.shape[0])\n ret = ret\n return ret\n\n\n@jit\ndef loss_fn_with_reg(X, P):\n ret = loss_fn(X, P)\n ret = ret + 0.01 * (P * P).sum()\n return ret\n\ngrad_fn = grad(loss_fn_with_reg, argnums=1)\nlr = 0.06\nfor i in range(100):\n batch = np.random.choice(X.shape[0], 512)\n r = grad_fn(jX[batch], P)\n P -= lr * r\n P = P.at[jnp.diag_indices(P.shape[0])].set(0)\n lr *= 0.99\n\ntarget_user_inds = [uid2idx[uid] for uid in target_user_ids]\nscores = X[target_user_inds] @ np.array(P)\nscores = np.asarray(scores - X[target_user_inds].astype(bool).astype(int) * 10000)\ntop_reco = (-scores).argsort(-1)[:, :K]\n\nfor uid, rec_list in zip(target_user_ids, top_reco):\n rec_sids = [str(idx2sid[sidx]) for sidx in rec_list]\n print(uid, ' '.join(rec_sids))\n" }, { "path": "programming_assignments/mini_reco/README.md", "content": "# Mini Reco \n\n문제 출제 및 검수: [김성진(nick.kim)](https://github.com/lancifollia), [양세현(dan.ce)](https://github.com/yangsehyun)\n\n> 이 문제로 영입을 진행하며 지원자분에게 드렸던 인터뷰 질문은 [interview.md](interview.md)에 있습니다. 문제를 풀어보시고 이 문서도 확인해보세요.\n\n## 목차 \n\n- [소개](#소개)\n- [User-based Collaborative Filtering](#user-based-collaborative-filtering)\n- [문제](#문제)\n - [참고 사항](#참고-사항)\n- [입력 데이터](#입력-데이터)\n - [제한 사항](#제한-사항)\n- [평가](#평가)\n - [예시](#예시)\n- [예제 테스트 케이스](#예제-테스트-케이스)\n - [예제 입력](#예제-입력)\n - [예제 출력](#예제-출력)\n - [설명](#설명)\n\n## 소개\n\n이 문제의 목표는 Memory-based Collaborative Filtering 기법 중 하나인 User-based Collaborative filtering 알고리즘을 사용해 추천 시스템을 만드는 것입니다. \n아래 알고리즘을 구현하여 Task를 수행하세요.\n\n## User-based Collaborative Filtering\n\nThe [memory-based](https://en.wikipedia.org/wiki/Collaborative_filtering#Memory-based) approach uses user rating data to compute the similarity between users or items. Typical examples of this approach are neighbourhood-based CF and item-based/user-based top-N recommendations. For example, in user based approaches, the value of ratings user $\\large u$ gives to item $\\large i$ is calculated as an aggregation of some similar users' rating of the item:\n\n$$\\large r_{u,i} = \\mathop{\\mathrm{aggr}}\\limits_{u^\\prime \\in U} r_{u^\\prime, i}$$\n\nwhere $\\large U$ denotes the set of top N users that are most similar to user $\\large u$ who rated item $\\large i$.\n\nSome examples of the aggregation function includes:\n\n$$\\large \\displaylines{\nr_{u,i} =& \\frac{1}{N}\\sum\\limits_{u^\\prime \\in U}r_{u^\\prime, i}\\\\\nr_{u,i} =& k\\sum\\limits_{u^\\prime \\in U}\\mathop{\\mathrm{simil}}(u,u^\\prime)r_{u^\\prime, i}\n}$$\n\nwhere $\\large k$ is a normalizing factor defined as $\\large k = 1/\\sum_{u^\\prime \\in U}|\\mathop{\\mathrm{simil}}(u,u^\\prime)|$, and\n\n$$\\large \\textbf{(1)} \\qquad r_{u,i} = \\bar{r_u} + k\\sum\\limits_{u^\\prime \\in U}\\mathop{\\mathrm{simil}}(u,u^\\prime)(r_{u^\\prime, i}-\\bar{r_{u^\\prime}})$$\n\nwhere $\\large \\bar{r_u}$ is the average rating of user $\\large u$ for all the items rated by $\\large u$.\n\nThe neighborhood-based algorithm calculates the similarity between two users or items, and produces a prediction for the user by taking the [weighted average](https://en.wikipedia.org/wiki/Weighted_average) of all the ratings. Similarity computation between items or users is an important part of this approach. Multiple measures, such as [Pearson correlation](https://en.wikipedia.org/wiki/Pearson_product-moment_correlation_coefficient) and [vector cosine](https://en.wikipedia.org/wiki/Cosine_similarity) based similarity are used for this.\n\nThe cosine similarity of two users $\\large x$, $\\large y$ is defined as:\n\n$$\\large \\textbf{(2)} \\qquad \\mathop{\\mathrm{simil}}(x,y) = \\cos(\\vec x,\\vec y) = \\frac{\\vec x \\cdot \\vec y}{||\\vec x|| \\times ||\\vec y||} = \\frac{\\sum\\limits_{i \\in I_{xy}}r_{x,i}r_{y,i}}{\\sqrt{\\sum\\limits_{i \\in I_{x}}r_{x,i}^2}\\sqrt{\\sum\\limits_{i \\in I_{y}}r_{y,i}^2}}$$\n\nwhere $\\large I_{xy}$ is the set of items that rated by both user $\\large x$ and user $\\large y$.\n\nThe user based top-N recommendation algorithm uses a similarity-based vector model to identify the $\\large k$ most similar users to an active user. After the $\\large k$ most similar users are found, their corresponding user-item matrices are aggregated to identify the set of items to be recommended.\n\n## 문제\n\n`num_reco_users`명의 사용자를 위해 User-based Collaborative Filtering 알고리즘으로 추천 결과를 만들어야 합니다.\n\n추천 결과를 만드는 방법은 다음과 같습니다.\n\n1. 식 (2)를 활용하여 최근접 이웃 집합 $\\large U$를 계산합니다.\n - $\\large U$는 사용자와 유사도가 가장 높은 `num_sim_user_top_N`명의 최근접 이웃 사용자로 구성됩니다.\n1. 식 (1)로 생성한 `num_item_rec_top_M` 개의 추천 결과를 한 줄로 출력합니다.\n - 추천 결과의 각 아이템 ID는 공백으로 구분되어야 합니다.\n - 사용자에게 추천할 수 있는 아이템은 전체 아이템 집합 $\\large I$가 아닌 최근접 이웃 $\\large U$가 평가한 아이템 집합 $\\large I^\\prime$입니다.\n\n### 참고 사항\n\n문제를 해결할 때 아래 내용을 참고하시기 바랍니다.\n\n1. 사용자가 이미 평가한 아이템은 추천 결과에 포함하지 않습니다.\n1. 추천할 수 있는 아이템의 수(n)가 `num_item_rec_top_M` 보다 작은 경우, 그 n개에 대해서만 추천합니다.\n1. 한 사용자가 같은 아이템을 중복해서 평가한 경우는 없습니다.\n1. 데이터는 희소 행렬 데이터입니다. 그러므로 모든 사용자와 아이템 쌍에 대한 평가가 존재하는 것은 아닙니다.\n1. Cosine similarity 계산이 정의되지 않는 경우에는 0으로 정의합니다.\n1. 식 (1)에서 normalizing factor $\\large k$ 값이 정의되지 않는 경우에는 0으로 정의합니다.\n\n## 입력 데이터\n\n데이터는 알고리즘 구현에 필요한 변숫값과 사용자가 아이템에 평가한 점수 그리고 추천 결과를 출력할 사용자 ID로 구성됩니다.\n\n- Line 1에는 `num_sim_user_top_N` 값이 있습니다. 평점 예측 시 사용할 최근접 이웃 사용자 수입니다.\n- Line 2에는 `num_item_rec_top_M` 값이 있습니다. 사용자별로 추천해야 하는 아이템 개수입니다.\n- Line 3, 4에는 각각 `num_users`, `num_items` 값이 있습니다. 해당 테스트 케이스에서 제공되는 데이터에 있는 사용자, 아이템 수입니다.\n- Line 5에는 `num_rows` 값이 있습니다. 데이터로 제공될 (`user_id`, `item_id`, `rating`) triplet의 개수입니다.\n- Line 6부터 `num_rows`개의 Line에는 (`user_id`, `item_id`, `rating`) triplet이 있으며 각 값은 공백으로 구분되어 있습니다.\n- Line (6 + `num_rows`)에는 `num_reco_users` 값이 있습니다. 추천 결과를 만들어야 할 사용자의 수입니다.\n- Line (6 + `num_rows` + 1)부터 `num_reco_users`개의 Line에는 추천 결과를 만들어야 할 사용자 ID가 있습니다.\n\n아래는 예시입니다. _(**주의**: `//` 이하는 데이터에 대한 설명이며 실제 데이터에는 존재하지 않습니다.)_\n\n```C\n2 // num_sim_user_top_N\n2 // num_item_rec_top_M\n5 // num_users\n10 // num_items\n15 // num_rows\n1 1 2.34 // 사용자 1이 아이템 1에 2.34점 부여\n1 2 6.21 // 사용자 1이 아이템 2에 6.21점 부여\n2 3 1.1 // 사용자 2가 아이템 3에 1.1점 부여\n...\n... // Line 20 (= 5 + num_rows)\n2 // num_reco_users\n1 // print num_item_rec_top_M items for user 1\n2 // print num_item_rec_top_M items for user 2\n```\n\n### 제한 사항\n\n- 1 <= `num_sim_user_top_N` <= 100 (integer)\n- 1 <= `num_item_rec_top_M` <= 30 (integer)\n- 1 <= `num_users` <= 300 (integer)\n- 1 <= `num_items` <= 70 (integer)\n- 1 <= `num_rows` <= 21,000 (integer)\n- 1 <= `num_reco_users` <= 100 (integer)\n- 1 <= `user_id` <= 300 (integer)\n- 1 <= `item_id` <= 70 (integer)\n- 1.0 <= `rating` <= 10.0 (real number)\n\n## 평가\n\n채점은 추천 결과와 정답 데이터의 유사성으로 평가합니다. \n_(nDCG: )_\n\n채점 코드에서는 정답에서 추천 결과 위치와 제출한 추천 결과 위치가 동일하면 1.0, 다르면 0.7을 부여하는 방식을 사용합니다.\n\n간단하게 아래 두 가지 특징을 참고하시기 바랍니다.\n\n1. 정답 추천 결과와 최대한 같은 순서로 추천해야 높은 nDCG 값을 얻을 수 있습니다. \n (이 문제의 목적은 Memory-based CF 알고리즘 로직을 정확하게 구현하는 것이지, 더 좋은 추천 결과를 생성하는 것이 아니라는 점을 유념해주시기 바랍니다.)\n1. 높은 순위의 추천 결과를 틀릴수록 페널티가 큽니다.\n\n이렇게 계산한 nDCG가 0.9를 넘으면 해당 테스트 케이스는 정답으로 채점하며, 0.9를 넘지 못하면 해당 테스트 케이스는 오답으로 채점합니다.\n\n참고로 Python으로 작성된 nDCG 계산 코드는 아래와 같습니다.\n\n```python\n# evaluation.py\nimport math\n\n\ndef ndcg(gt, rec):\n idcg = sum([1.0 / math.log(i + 2, 2) for i in range(len(gt))])\n dcg = 0.0\n for i, r in enumerate(rec):\n if r not in gt:\n continue\n gt_index = gt.index(r)\n if i != gt_index:\n rel = 0.7\n else:\n rel = 1.0\n dcg += rel / math.log(i + 2, 2)\n ndcg = dcg / idcg\n\n return ndcg\n```\n\n위 코드에서 변수 `gt`는 정답 추천 결과이며, 변수 `rec`는 제출된 추천 결과를 의미합니다.\n\n### 예시\n\n```python\n# 예시 1\n>>> gt = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n>>> rec = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n>>> ndcg(gt, rec)\n1.0\n```\n\n예시 1은 정답과 완전히 동일한 경우이며, nDCG는 1.0입니다.\n\n```python\n# 예시 2\n>>> gt = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n>>> rec = [1, 2, 3, 11, 5, 6, 7, 8, 9, 10]\n>>> ndcg(gt, rec)\n0.9052116356304495\n```\n\n예시 2는 네 번째 추천 결과를 틀린 경우입니다.\n\n```python\n# 예시 3\n>>> gt = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n>>> rec = [1, 2, 3, 4, 5, 6, 7, 11, 9, 10]\n>>> ndcg(gt, rec)\n0.9305687780632229\n```\n\n예시 3은 여덟 번째 추천 결과를 틀린 경우입니다.\n\n네 번째 추천 결과를 틀린 예시 2보다는 여덟 번째 추천 결과를 틀린 예시 3의 nDCG가 높습니다. \n즉, 높은 순위의 추천 결과를 틀릴수록 nDCG 페널티가 큽니다.\n\n## 예제 테스트 케이스\n\n### 예제 입력\n\n```text\n2\n2\n5\n10\n15\n1 1 1.0\n1 2 2.0\n1 5 1.2\n2 2 1.5\n2 3 3.0\n3 1 2.2\n3 2 6.2\n3 7 1.5\n4 6 1.2\n4 3 1.5\n4 1 3.1\n4 2 4.0\n5 4 8.2\n5 2 6.5\n5 7 8.0\n2\n1\n2\n```\n\n### 예제 출력\n\n```text\n3 6\n1 6\n```\n\n### 설명\n\n위 입력으로부터 얻은 값들은 아래와 같습니다.\n\n- Line 1: `num_sim_user_top_N` = 2 (집합 U는 최고 유사 사용자 2명으로 만들어야 함)\n- Line 2: `num_item_rec_top_M` = 2 (사용자별 추천 결과는 2개를 만들어야 함)\n- Line 3: `num_users` = 5 (평점 데이터의 사용자 수는 총 5명)\n- Line 4: `num_items` = 10 (평점 데이터의 아이템 수는 총 10개)\n- Line 5: `num_rows` = 15 (평점 데이터의 row 개수는 15개)\n- Line 6~20: 평점 데이터의 triplet (`user_id`, `item_id`, `rating`)\n- Line 21: `num_reco_users` = 2 (추천 결과를 만들어야 할 사용자 수는 2명)\n- Line 22~23: 추천 결과를 만들어야 할 사용자의 ID 리스트 (`user_id`= 1, 2에 해당하는 사용자의 추천 결과를 만들어서 출력해야 함)\n\n정리하면, 주어진 평점 데이터를 이용해서 사용자 1, 사용자 2에게 각각 추천 결과를 2개씩 만들어주면 됩니다. \n식(1)을 이용해 추천 결과를 계산할 때 사용하는 집합 $\\large U$는 추천 결과를 만들어야 할 사용자와 가장 유사한 사용자 2명으로 구성합니다.\n\n사용자 1의 경우, 최고 유사 사용자는 사용자 3, 사용자 4이고, 사용자 1과의 유사도는 각각 0.85263, 0.80806입니다. \n이렇게 구한 집합 U를 이용해서 식(1)을 계산해서 예측 평점이 가장 높은 아이템 2개를 예측 평점 순으로 내림차순 정렬해서 출력하면 됩니다. \n단, 추천 결과를 만들 때는 사용자 1이 기존에 평가한 아이템(샘플에서는 아이템 1, 아이템 2, 아이템 5)은 추천 결과에서 빠져야 하는 점을 유의해주시기 바랍니다.\n\n위 출력 예시의 첫 번째 줄에 있는 `3 6`은 정답 소스 코드로 계산한 사용자 1의 추천 결과 1순위는 아이템 3이며, 2순위는 아이템 6이라는 뜻입니다.\n\n사용자 1, 사용자 2의 정답 추천 결과와 제출된 추천 결과 간 nDCG 계산 후, 0.9 이상이면 정답 처리합니다.\n" }, { "path": "programming_assignments/mini_reco/evaluation.py", "content": "import math\n\n\ndef ndcg(gt, rec):\n idcg = sum([1.0 / math.log(i + 2, 2) for i in range(len(gt))])\n dcg = 0.0\n for i, r in enumerate(rec):\n if r not in gt:\n continue\n gt_index = gt.index(r)\n if i != gt_index:\n rel = 0.7\n else:\n rel = 1.0\n dcg += rel / math.log(i + 2, 2)\n ndcg = dcg / idcg\n\n return ndcg\n" }, { "path": "programming_assignments/mini_reco/interview.md", "content": "# Mini Reco 인터뷰 질문\n\n> [▶︎ Mini Reco 문제로 돌아가기](README.md)\n\nMini Reco 문제로 영입을 진행하며 지원자분에게 드렸던 인터뷰 질문과 예시 답변을 모아놓았습니다.\n\n## 질문 1\n\n[User-based Collaborative Filtering 설명](README.md#user-based-collaborative-filtering)의 식 (1)을 보고 추천 결과가 어떻게 생성되는지 설명해주세요.\n\n$$\\large \\textbf{(1)} \\qquad r_{u,i} = \\bar{r_u} + k\\sum\\limits_{u^\\prime \\in U}\\mathop{\\mathrm{simil}}(u,u^\\prime)(r_{u^\\prime, i}-\\bar{r_{u^\\prime}})$$\n\n
\n예시 답변\n\n- 유저의 특정 아이템에 대한 예측 평점은 아래 두 항을 더해서 구한다.\n - 우변 첫번째 항은 해당 유저의 평점 평균을 의미하고,\n - 우변 두번째 항은 유사 이웃들의 평점 편차의 가중 평균을 의미한다.\n\n
\n\n## 질문 2\n\n[User-based Collaborative Filtering 설명](README.md#user-based-collaborative-filtering)의 식 (1)이 다음과 같이 바뀐다면( $\\large\\bar{r_u}$, $\\large\\bar{r_{u^\\prime}}$ 항이 사라진다면) 추천 결과가 어떻게 달라질까요?\n\n$$\\large \\textbf{(1-1)} \\qquad r_{u,i} = k\\sum\\limits_{u^\\prime \\in U}\\mathop{\\mathrm{simil}}(u,u^\\prime)(r_{u^\\prime, i})$$\n\n
\n힌트\n\n- 만약 특정 유저의 점수가 굉장히 짠 편이라면(모든 아이템에 대해서 낮은 점수를 부여한다면) 어떤 상황이 발생할까요?\n\n
\n\n
\n예시 답변\n\n- 식 (1)에서 (1-1)로 바뀌는 것은 bias 텀 없이 이웃들의 평점 평균으로만 해당 유저의 평점을 계산하는 것을 의미한다.\n- 하지만 유저의 평점 bias가 서로 다르고 그 점이 반영되지 않는다면, 제대로 된 추천 결과(예상 평점)가 계산되지 않을 수 있다.\n\n(극단적으로) 예를 들면, 유저 A의 평점 평균은 2점이고 유저 A의 최근접 이웃들의 평점 평균은 4.5점인 상황을 가정해보자. 유저 A의 최근접 이웃들이 특정 아이템 B에 대해서 평균 3점 정도의 평가를 내렸다고 할 때, (bias를 반영하지 않는 식 (1-1)의 경우) 최근접 이웃들의 기준으로 보았을 때 아이템 B는 비추천할만한 아이템이지만 유저 A의 평점 평균과 비교해보았을때는 추천 작품이 될 수 있다. 따라서 각 유저의 평점 bias를 반영하여 추천 결과(예상 평점)를 계산하는 것이 더 좋은 결과를 낼 수 있을 것이다.\n\n
\n\n## 질문 3\n\n[User-based Collaborative Filtering 설명](README.md#user-based-collaborative-filtering)의 식 (1)이 다음과 같이 바꾸려고 한다면( $\\large\\mathop{\\mathrm{simil}}(u,u^\\prime)$ 항이 사라진다면) 식을 어떻게 수정해야할까요?\n\n$$\\large \\textbf{(1-2)} \\qquad r_{u,i} = \\bar{r_u} + k\\sum\\limits_{u^\\prime \\in U}(r_{u^\\prime, i}-\\bar{r_{u^\\prime}})$$\n\n
\n예시 답변\n\n- 식 (1)에서 우변의 마지막 항은 최근접 이웃이 해당 아이템에 매긴 평점의 가중 평균이었으나, 식 (1-2)에서는 가중 평균이 아닌 산술 평균으로 변경하려는 것으로 볼 수 있다.\n- 따라서 $\\large k=\\frac{1}{|U|}$로 수정하면 최근접 이웃의 평점의 산술 평균으로 계산한 추천 결과(예상 평점)를 얻을 수 있을 것이다.\n\n
\n" }, { "path": "programming_assignments/mini_reco/solution/solution.py", "content": "import sys\n\n# 데이터 입력\nnum_sim_user_top_N = int(sys.stdin.readline()) # 유사도 top N 사용자에 대하여 예측 평점 계산\nnum_item_rec_top_M = int(sys.stdin.readline()) # 예측 평점 top M 아이템 출력\nnum_users = int(sys.stdin.readline()) # 전체 사용자 수\nnum_items = int(sys.stdin.readline()) # 전체 아이템 수\nnum_rows = int(sys.stdin.readline()) # 입력 row 개수\n\nrating_data = {} # {사용자 ID: {아이템 ID: 평점}} 형태로 저장\nitems = set() # 모든 아이템을 모아놓은 set\n\n# row 입력\nfor _ in range(num_rows):\n user, item, rating = sys.stdin.readline().split(' ')\n user = int(user)\n item = int(item)\n rating = float(rating)\n\n if user not in rating_data:\n rating_data[user] = {}\n rating_data[user][item] = rating\n\n items.add(item)\n\n# 사용자 별 평균 평점 계산\nuser_average_rating = dict() # {사용자 ID: 평균 평점} 형태로 저장\nfor user, item_ratings in rating_data.items():\n user_average_rating[user] = sum(item_ratings.values()) / len(item_ratings)\n\nnum_reco_users = int(sys.stdin.readline()) # 추천할 사용자 수\n\nfor _ in range(num_reco_users):\n query_user = int(sys.stdin.readline()) # 추천할 사용자 ID\n user_sim = dict() # {사용자 ID: 유사도} 형태로 저장\n\n # 사용자 별 유사도(cosine similarity) 계산 (query_user 자신과는 계산 안함)\n for user in rating_data.keys() - {query_user}:\n user_ratings = rating_data[user]\n query_user_ratings = rating_data[query_user]\n intersection_items = rating_data[query_user].keys() & rating_data[user].keys()\n\n numerator = sum(user_ratings[item] * query_user_ratings[item] for item in intersection_items)\n denominator = sum(rating ** 2 for rating in user_ratings.values()) ** 0.5\n denominator *= sum(rating ** 2 for rating in query_user_ratings.values()) ** 0.5\n # 유사도 계산해서 저장 (계산되지 않는 경우 0으로 정의)\n user_sim[user] = numerator / denominator if denominator > 0.0 else 0.0\n\n # 유사도 기준으로 정렬. [(사용자 ID, 유사도), ...] 형태의 list of tuple로 저장\n nearest = sorted(user_sim.items(), key=lambda x: x[1], reverse=True)\n\n predicted_rating = list() # 예측 평점 (높은 순서에 따라 추천됨). [(아이템 ID, 예측 평점), ...] 형태의 list of tuple로 저장\n\n # 이미 평가한 정보가 있으면 예측 평점을 계산하지 않음\n for item in items - rating_data[query_user].keys():\n sum_k = 0 # normalizing factor k 계산을 위한 sum. k = 1 / sum_k\n sum_u = 0 # SUM for u' in U [simil(u, u') * (r_u'i - r_u')]\n\n # 유사도 top N 사용자에 대해 계산\n for user, similarity in nearest[:num_sim_user_top_N]:\n # 사용자가 아이템을 평가하지 않았으면 계산하지 않음\n if item not in rating_data[user]:\n continue\n\n sum_u += similarity * (rating_data[user][item] - user_average_rating[user])\n sum_k += abs(similarity)\n\n # 아이템의 예측 평점 (r_ui)\n # 유사도 top N 사용자가 모두 아이템을 평가하지 않았으면 이 아이템에 대해 예측할 수 없음 (0으로 정의)\n r_ui = user_average_rating[query_user] + (1 / sum_k) * sum_u if sum_k > 0.0 else 0.0\n\n predicted_rating += [(item, r_ui)] # 예측 평점 list에 저장\n\n predicted_rating.sort(key=lambda x: x[1], reverse=True) # 예측 평점 list 정렬\n print(' '.join(str(item_rating[0]) for item_rating in predicted_rating[:num_item_rec_top_M])) # 추천 리스트 출력\n" }, { "path": "programming_assignments/mini_reco/testcase/input/input000.txt", "content": "2\n2\n5\n10\n15\n1 1 1.0\n1 2 2.0\n1 5 1.2\n2 2 1.5\n2 3 3.0\n3 1 2.2\n3 2 6.2\n3 7 1.5\n4 6 1.2\n4 3 1.5\n4 1 3.1\n4 2 4.0\n5 4 8.2\n5 2 6.5\n5 7 8.0\n2\n1\n2\n" }, { "path": "programming_assignments/mini_reco/testcase/input/input001.txt", "content": "32\n7\n200\n50\n3454\n1 1 4.989\n1 2 1.000\n1 3 4.989\n1 4 1.000\n1 5 1.000\n1 6 6.338\n1 7 1.000\n1 8 2.543\n1 9 1.000\n1 10 1.000\n1 11 2.543\n1 12 4.989\n1 13 1.000\n1 14 4.086\n1 15 4.989\n1 16 1.000\n1 17 1.000\n1 18 1.000\n1 19 2.543\n1 20 5.332\n1 21 4.989\n1 22 1.000\n1 23 1.000\n1 24 5.332\n1 25 4.583\n1 26 1.000\n1 27 1.000\n1 28 5.332\n1 29 4.583\n2 21 1.000\n2 26 1.000\n2 2 1.000\n2 8 5.332\n2 27 4.583\n2 15 5.332\n2 17 1.000\n2 30 1.000\n2 31 1.000\n2 24 3.446\n2 25 1.000\n2 29 1.000\n3 18 1.000\n3 2 3.446\n3 4 4.583\n3 23 1.000\n3 31 3.446\n3 15 5.629\n3 11 4.989\n3 5 5.332\n3 19 3.446\n3 32 3.446\n3 30 4.989\n3 20 4.989\n3 21 4.086\n3 22 1.000\n3 24 5.332\n3 14 5.332\n3 33 5.332\n3 26 4.086\n3 34 4.989\n3 27 2.543\n3 10 1.000\n3 35 4.583\n3 28 5.332\n3 29 5.332\n4 21 5.332\n4 2 4.989\n4 4 4.583\n4 10 4.989\n4 9 4.583\n4 15 5.332\n4 32 4.583\n4 36 4.989\n4 19 4.989\n4 37 4.583\n4 31 4.583\n4 22 2.543\n4 33 4.583\n4 28 4.583\n4 29 5.332\n4 11 4.086\n5 21 2.543\n5 31 4.086\n5 2 2.543\n5 38 5.629\n5 7 1.000\n5 19 5.629\n5 16 5.629\n5 13 5.629\n5 5 4.989\n5 18 1.000\n5 20 6.126\n5 39 5.891\n5 22 1.000\n5 23 3.446\n5 33 5.891\n5 34 5.891\n5 10 1.000\n5 35 6.338\n6 14 1.000\n6 6 5.332\n6 17 1.000\n6 8 4.086\n6 40 1.000\n6 41 1.000\n6 42 2.543\n6 30 2.543\n6 31 4.086\n6 38 4.583\n6 26 4.086\n6 34 1.000\n6 27 2.543\n6 24 4.583\n6 28 3.446\n7 12 4.989\n7 2 4.086\n7 3 6.126\n7 4 5.891\n7 33 1.000\n7 7 4.583\n7 26 2.543\n7 10 2.543\n7 15 6.710\n7 5 3.446\n7 37 1.000\n7 20 1.000\n7 38 4.086\n7 34 4.989\n7 24 5.332\n7 28 5.332\n7 18 3.446\n7 14 5.332\n8 16 4.086\n8 5 3.446\n8 32 4.583\n8 20 1.000\n8 9 1.000\n8 29 4.583\n8 22 1.000\n8 24 3.446\n8 33 4.583\n8 38 2.543\n8 26 3.446\n8 18 6.532\n9 1 5.332\n9 3 5.891\n9 4 2.543\n9 6 7.028\n9 43 4.989\n9 8 1.000\n9 44 5.891\n9 9 1.000\n9 12 4.989\n9 19 1.000\n9 15 3.446\n9 17 5.332\n9 31 4.583\n9 25 5.629\n9 34 2.543\n9 45 5.332\n9 46 5.332\n9 18 3.446\n10 21 4.989\n10 6 3.446\n10 7 2.543\n10 23 1.000\n10 16 4.583\n10 17 4.583\n10 37 3.446\n10 31 4.086\n10 39 4.583\n10 13 2.543\n10 35 5.332\n11 2 2.543\n11 4 6.532\n11 6 6.338\n11 7 1.000\n11 36 4.086\n11 23 4.989\n11 10 6.126\n11 11 5.891\n11 5 6.338\n11 19 6.532\n11 32 6.338\n11 17 4.086\n11 20 6.710\n11 21 5.891\n11 18 7.669\n11 33 6.338\n11 35 7.028\n11 29 4.086\n12 21 7.307\n12 31 7.172\n12 2 5.332\n12 4 8.253\n12 6 4.989\n12 43 1.000\n12 5 7.434\n12 23 9.267\n12 10 7.172\n12 11 1.000\n12 36 1.000\n12 19 7.777\n12 20 7.777\n12 22 2.543\n12 18 8.571\n12 28 4.583\n13 1 4.583\n13 4 5.891\n13 43 1.000\n13 9 3.446\n13 10 4.583\n13 12 3.446\n13 15 4.086\n13 3 1.000\n13 36 3.446\n13 5 4.086\n13 20 4.989\n13 21 3.446\n13 31 4.989\n13 18 4.086\n13 25 2.543\n13 34 2.543\n13 24 3.446\n14 44 4.086\n14 43 1.000\n14 36 6.126\n14 47 1.000\n14 22 1.000\n14 14 5.332\n14 28 6.338\n14 11 4.086\n15 3 1.000\n15 6 5.891\n15 8 4.583\n15 32 4.989\n15 17 3.446\n15 37 4.583\n15 20 1.000\n15 31 6.875\n15 25 7.554\n15 27 1.000\n15 35 3.446\n15 24 3.446\n16 25 6.338\n16 1 5.629\n16 44 5.629\n16 2 3.446\n16 36 6.338\n16 12 3.446\n16 27 4.583\n16 15 1.000\n16 17 4.086\n16 31 5.332\n16 22 3.446\n16 24 5.332\n16 14 6.875\n16 33 6.532\n16 38 4.989\n16 26 5.332\n16 34 3.446\n16 10 1.000\n16 45 5.332\n16 28 5.332\n17 4 2.543\n17 22 1.000\n17 6 7.028\n17 5 2.543\n17 23 1.000\n17 10 2.543\n17 11 4.989\n17 2 2.543\n17 35 5.629\n17 19 1.000\n17 17 3.446\n17 20 6.126\n17 31 3.446\n17 37 1.000\n17 24 1.000\n17 14 4.583\n17 25 6.532\n17 33 1.000\n17 34 2.543\n17 27 2.543\n17 28 5.629\n17 29 5.332\n17 18 1.000\n18 2 1.000\n18 23 1.000\n18 10 2.543\n18 4 2.543\n18 14 4.086\n18 19 1.000\n18 5 1.000\n18 18 1.000\n18 21 4.989\n18 33 1.000\n18 22 1.000\n18 28 5.629\n19 1 7.881\n19 44 7.307\n19 3 5.891\n19 7 1.000\n19 9 2.543\n19 23 1.000\n19 10 2.543\n19 15 4.583\n19 16 2.543\n19 14 4.086\n19 4 2.543\n19 36 2.543\n19 12 6.710\n19 48 5.629\n19 47 2.543\n19 30 2.543\n19 29 5.629\n19 33 1.000\n19 34 2.543\n19 27 3.446\n19 6 6.532\n19 17 3.446\n19 43 1.000\n19 8 1.000\n19 5 1.000\n19 42 2.543\n19 20 5.891\n19 22 1.000\n19 24 5.629\n19 25 5.629\n19 35 6.126\n19 45 7.307\n19 46 7.669\n19 18 1.000\n19 19 1.000\n19 41 5.629\n19 39 2.543\n19 28 5.891\n19 21 7.172\n19 11 4.989\n20 6 2.543\n20 9 1.000\n20 11 5.332\n20 5 4.583\n20 19 5.891\n20 20 4.086\n20 10 4.086\n20 18 7.554\n21 43 1.000\n21 11 2.543\n21 12 3.446\n21 15 3.446\n21 17 4.086\n21 30 5.332\n21 22 2.543\n21 24 5.332\n21 34 3.446\n22 3 4.583\n22 4 1.000\n22 6 7.434\n22 7 2.543\n22 8 1.000\n22 23 1.000\n22 10 1.000\n22 31 2.543\n22 16 1.000\n22 11 4.583\n22 5 2.543\n22 17 1.000\n22 21 5.332\n22 39 1.000\n22 18 1.000\n22 46 3.446\n22 20 4.583\n23 21 5.332\n23 7 4.086\n23 43 5.891\n23 16 5.332\n23 32 5.332\n23 17 6.126\n23 37 5.332\n23 13 4.989\n23 35 5.891\n24 12 4.989\n24 1 5.629\n24 44 6.126\n24 2 2.543\n24 22 1.000\n24 9 1.000\n24 23 1.000\n24 14 4.583\n24 15 5.332\n24 16 2.543\n24 5 2.543\n24 18 1.000\n24 45 5.332\n24 26 4.989\n24 27 1.000\n24 10 2.543\n24 24 5.629\n24 28 5.891\n24 29 4.989\n24 46 5.629\n25 6 4.583\n25 43 1.000\n25 34 2.543\n25 46 4.583\n25 41 4.989\n25 12 4.989\n25 15 5.891\n25 32 4.989\n25 17 5.629\n25 48 5.332\n25 30 3.446\n25 37 4.989\n25 49 4.989\n25 18 5.891\n25 24 5.629\n25 33 1.000\n25 27 3.446\n25 50 4.989\n26 1 4.583\n26 44 3.446\n26 2 4.583\n26 4 5.629\n26 43 4.583\n26 9 4.086\n26 23 4.583\n26 46 3.446\n26 10 6.126\n26 11 4.989\n26 15 4.583\n26 36 5.332\n26 5 4.583\n26 19 4.086\n26 32 2.543\n26 48 4.583\n26 42 4.086\n26 30 4.086\n26 20 5.629\n26 31 1.000\n26 29 5.891\n26 22 2.543\n26 24 1.000\n26 33 5.332\n26 38 5.891\n26 26 4.583\n26 27 1.000\n26 45 3.446\n26 28 5.629\n26 18 4.989\n26 14 4.989\n27 4 1.000\n27 6 7.434\n27 7 1.000\n27 9 1.000\n27 23 1.000\n27 10 1.000\n27 11 4.989\n27 12 5.891\n27 19 1.000\n27 16 1.000\n27 13 1.000\n27 5 1.000\n27 18 1.000\n27 17 1.000\n27 39 1.000\n27 20 6.875\n27 21 6.126\n27 33 1.000\n27 27 4.989\n27 35 6.710\n27 28 5.891\n27 29 6.875\n28 21 1.000\n28 44 1.000\n28 3 1.000\n28 1 1.000\n28 48 1.000\n28 17 1.000\n28 9 1.000\n28 10 1.000\n28 11 4.086\n28 12 1.000\n28 15 1.000\n28 13 1.000\n28 36 1.000\n28 5 1.000\n28 47 1.000\n28 39 1.000\n28 37 2.543\n28 28 1.000\n28 22 1.000\n28 24 2.543\n28 25 7.172\n28 27 3.446\n28 45 1.000\n28 46 1.000\n28 50 2.543\n29 1 4.989\n29 44 4.989\n29 26 2.543\n29 9 4.989\n29 10 3.446\n29 12 4.086\n29 15 4.583\n29 18 4.989\n29 5 4.086\n29 27 1.000\n29 24 4.086\n29 34 1.000\n29 45 4.989\n29 28 2.543\n29 29 5.891\n29 46 4.989\n30 31 4.989\n30 6 6.338\n30 7 1.000\n30 11 4.989\n30 12 2.543\n30 14 1.000\n30 15 6.532\n30 16 1.000\n30 13 2.543\n30 21 4.086\n30 9 1.000\n30 35 5.629\n30 29 5.332\n31 4 5.629\n31 6 2.543\n31 26 1.000\n31 9 1.000\n31 10 5.891\n31 15 6.126\n31 16 5.629\n31 19 4.086\n31 37 1.000\n31 31 5.629\n31 29 5.629\n31 18 7.434\n31 23 1.000\n31 35 2.543\n31 28 6.126\n32 1 4.583\n32 9 1.000\n32 11 4.583\n32 15 5.332\n32 13 5.891\n32 5 2.543\n32 31 3.446\n32 22 1.000\n32 25 4.583\n32 28 4.086\n32 46 4.989\n32 18 3.446\n32 14 1.000\n32 20 4.989\n33 1 1.000\n33 2 5.629\n33 6 7.028\n33 9 5.332\n33 23 4.086\n33 10 6.126\n33 16 4.583\n33 19 2.543\n33 12 4.989\n33 29 4.086\n33 28 3.446\n33 4 1.000\n33 5 4.086\n33 32 4.583\n33 20 4.583\n33 18 5.891\n33 22 2.543\n33 11 4.086\n34 2 5.891\n34 4 3.446\n34 25 4.086\n34 5 4.086\n34 19 4.086\n34 17 3.446\n34 37 1.000\n34 31 6.532\n34 33 2.543\n34 35 7.307\n34 24 7.434\n35 2 1.000\n35 6 6.338\n35 7 1.000\n35 12 4.583\n35 4 4.989\n35 19 4.989\n35 21 5.332\n35 20 5.891\n35 18 5.332\n35 23 4.989\n35 10 4.989\n35 35 4.086\n36 4 6.126\n36 33 1.000\n36 23 6.532\n36 10 6.126\n36 3 4.086\n36 16 4.583\n36 36 5.629\n36 20 6.338\n36 22 2.543\n36 18 7.307\n36 14 5.891\n36 38 5.891\n36 12 1.000\n36 28 5.891\n37 2 3.446\n37 4 4.583\n37 23 5.629\n37 10 5.332\n37 12 4.086\n37 5 4.989\n37 19 4.086\n37 17 4.583\n37 20 5.891\n37 31 4.989\n37 22 1.000\n37 18 5.629\n37 24 5.891\n37 28 4.086\n38 1 4.989\n38 44 4.989\n38 2 1.000\n38 3 1.000\n38 28 1.000\n38 43 1.000\n38 8 1.000\n38 9 1.000\n38 15 1.000\n38 36 1.000\n38 32 5.332\n38 39 1.000\n38 37 2.543\n38 31 7.307\n38 18 1.000\n38 24 6.338\n38 25 7.028\n38 34 1.000\n38 27 2.543\n38 45 4.583\n38 29 4.086\n39 12 4.086\n39 26 1.000\n39 43 1.000\n39 9 4.583\n39 11 4.989\n39 24 4.583\n39 34 2.543\n39 45 3.446\n39 18 5.891\n40 12 3.446\n40 16 4.086\n40 2 4.086\n40 4 3.446\n40 43 1.000\n40 5 3.446\n40 9 4.086\n40 23 4.583\n40 19 5.891\n40 17 1.000\n40 20 5.332\n40 21 4.583\n40 31 6.126\n40 22 1.000\n40 24 4.086\n40 14 2.543\n40 33 5.332\n40 38 3.446\n40 34 2.543\n40 27 2.543\n40 10 4.989\n40 35 5.629\n40 18 7.881\n41 21 5.629\n41 2 3.446\n41 6 2.543\n41 43 1.000\n41 31 5.891\n41 19 2.543\n41 37 4.989\n41 9 1.000\n41 29 5.332\n41 27 2.543\n41 35 6.126\n41 20 1.000\n42 21 1.000\n42 2 3.446\n42 4 1.000\n42 9 1.000\n42 10 1.000\n42 12 1.000\n42 15 1.000\n42 16 1.000\n42 13 1.000\n42 19 1.000\n42 37 1.000\n42 24 1.000\n42 34 1.000\n42 27 2.543\n42 28 4.989\n43 2 4.086\n43 4 2.543\n43 6 6.875\n43 43 5.332\n43 8 3.446\n43 9 1.000\n43 23 1.000\n43 10 2.543\n43 12 4.989\n43 14 5.332\n43 15 4.989\n43 13 2.543\n43 35 6.126\n43 5 3.446\n43 19 1.000\n43 39 2.543\n43 37 5.332\n43 20 6.126\n43 21 3.446\n43 22 1.000\n43 16 1.000\n43 33 1.000\n43 38 3.446\n43 27 2.543\n43 28 5.332\n43 29 4.583\n43 18 1.000\n43 11 5.332\n44 1 2.543\n44 44 2.543\n44 23 1.000\n44 10 1.000\n44 15 2.543\n44 13 1.000\n44 19 1.000\n44 29 2.543\n44 50 3.446\n44 12 1.000\n44 47 2.543\n44 48 3.446\n44 33 3.446\n44 34 1.000\n44 27 1.000\n44 21 1.000\n44 43 2.543\n44 5 1.000\n44 32 1.000\n44 42 1.000\n44 24 2.543\n44 25 3.446\n44 26 2.543\n44 45 2.543\n44 46 2.543\n44 11 4.086\n44 18 1.000\n44 39 1.000\n45 31 1.000\n45 1 6.875\n45 44 7.307\n45 4 1.000\n45 6 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5.332\n199 46 5.332\n200 44 4.989\n200 6 7.028\n200 1 4.989\n200 9 1.000\n200 31 1.000\n200 11 4.989\n200 12 4.989\n200 15 5.629\n200 3 4.583\n200 5 1.000\n200 43 1.000\n200 19 1.000\n200 47 2.543\n200 37 3.446\n200 29 5.629\n200 46 4.989\n200 25 6.532\n200 26 4.989\n200 10 1.000\n200 45 4.989\n200 50 5.629\n30\n51\n52\n53\n54\n55\n56\n57\n58\n59\n60\n61\n62\n63\n64\n65\n66\n67\n68\n69\n70\n71\n72\n73\n74\n75\n76\n77\n78\n79\n80\n" }, { "path": "programming_assignments/mini_reco/testcase/input/input002.txt", "content": "21\n15\n200\n50\n3454\n1 1 4.989\n1 2 1.000\n1 3 4.989\n1 4 1.000\n1 5 1.000\n1 6 6.338\n1 7 1.000\n1 8 2.543\n1 9 1.000\n1 10 1.000\n1 11 2.543\n1 12 4.989\n1 13 1.000\n1 14 4.086\n1 15 4.989\n1 16 1.000\n1 17 1.000\n1 18 1.000\n1 19 2.543\n1 20 5.332\n1 21 4.989\n1 22 1.000\n1 23 1.000\n1 24 5.332\n1 25 4.583\n1 26 1.000\n1 27 1.000\n1 28 5.332\n1 29 4.583\n2 21 1.000\n2 26 1.000\n2 2 1.000\n2 8 5.332\n2 27 4.583\n2 15 5.332\n2 17 1.000\n2 30 1.000\n2 31 1.000\n2 24 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3.446\n26 2 4.583\n26 4 5.629\n26 43 4.583\n26 9 4.086\n26 23 4.583\n26 46 3.446\n26 10 6.126\n26 11 4.989\n26 15 4.583\n26 36 5.332\n26 5 4.583\n26 19 4.086\n26 32 2.543\n26 48 4.583\n26 42 4.086\n26 30 4.086\n26 20 5.629\n26 31 1.000\n26 29 5.891\n26 22 2.543\n26 24 1.000\n26 33 5.332\n26 38 5.891\n26 26 4.583\n26 27 1.000\n26 45 3.446\n26 28 5.629\n26 18 4.989\n26 14 4.989\n27 4 1.000\n27 6 7.434\n27 7 1.000\n27 9 1.000\n27 23 1.000\n27 10 1.000\n27 11 4.989\n27 12 5.891\n27 19 1.000\n27 16 1.000\n27 13 1.000\n27 5 1.000\n27 18 1.000\n27 17 1.000\n27 39 1.000\n27 20 6.875\n27 21 6.126\n27 33 1.000\n27 27 4.989\n27 35 6.710\n27 28 5.891\n27 29 6.875\n28 21 1.000\n28 44 1.000\n28 3 1.000\n28 1 1.000\n28 48 1.000\n28 17 1.000\n28 9 1.000\n28 10 1.000\n28 11 4.086\n28 12 1.000\n28 15 1.000\n28 13 1.000\n28 36 1.000\n28 5 1.000\n28 47 1.000\n28 39 1.000\n28 37 2.543\n28 28 1.000\n28 22 1.000\n28 24 2.543\n28 25 7.172\n28 27 3.446\n28 45 1.000\n28 46 1.000\n28 50 2.543\n29 1 4.989\n29 44 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2.543\n44 44 2.543\n44 23 1.000\n44 10 1.000\n44 15 2.543\n44 13 1.000\n44 19 1.000\n44 29 2.543\n44 50 3.446\n44 12 1.000\n44 47 2.543\n44 48 3.446\n44 33 3.446\n44 34 1.000\n44 27 1.000\n44 21 1.000\n44 43 2.543\n44 5 1.000\n44 32 1.000\n44 42 1.000\n44 24 2.543\n44 25 3.446\n44 26 2.543\n44 45 2.543\n44 46 2.543\n44 11 4.086\n44 18 1.000\n44 39 1.000\n45 31 1.000\n45 1 6.875\n45 44 7.307\n45 4 1.000\n45 6 2.543\n45 26 1.000\n45 8 2.543\n45 5 1.000\n45 9 4.086\n45 23 1.000\n45 12 6.532\n45 15 4.583\n45 16 3.446\n45 13 1.000\n45 36 4.086\n45 19 4.583\n45 39 1.000\n45 28 6.875\n45 20 7.307\n45 21 6.710\n45 22 4.086\n45 18 1.000\n45 24 7.307\n45 25 6.875\n45 33 7.307\n45 38 6.875\n45 34 1.000\n45 27 5.891\n45 10 1.000\n45 35 6.126\n45 49 2.543\n45 45 7.028\n45 29 6.710\n45 46 6.532\n45 14 6.875\n46 4 4.086\n46 6 4.583\n46 7 1.000\n46 43 5.332\n46 9 2.543\n46 10 2.543\n46 12 2.543\n46 16 1.000\n46 36 1.000\n46 19 2.543\n46 32 2.543\n46 17 1.000\n46 37 1.000\n46 20 4.086\n46 29 5.332\n46 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{ "path": "programming_assignments/mini_reco/testcase/output/output003.txt", "content": "42 30 28 25 15 26 48 14 50 36\n20 35 25 50 14 6 3 29 44 1\n25 45 44 1 46 30 3 41 24 36\n20 35 14 28 3 41 6 40 38 49\n11 3 50 41 48 30 40 2 37 32\n30 25 28 42 15 21 11 14 26 24\n50 25 41 21 44 11 24 45 46 30\n35 50 20 25 6 11 21 36 12 40\n50 25 46 15 11 21 48 41 43 36\n25 35 28 6 29 14 33 41 11 40\n50 35 6 49 48 25 28 24 20 21\n30 25 26 15 28 42 41 29 3 14\n30 20 28 25 42 26 31 41 3 15\n15 30 35 41 49 28 19 29 31 42\n35 25 46 28 6 40 20 24 49 14\n30 15 45 42 44 25 14 41 3 1\n25 35 20 41 40 11 28 50 3 14\n30 15 29 41 50 11 48 44 47 33\n20 35 6 11 24 1 14 44 45 29\n35 50 20 25 15 3 40 11 46 6\n20 30 6 33 31 15 28 35 24 19\n25 35 14 28 46 20 24 29 3 12\n20 25 35 11 50 15 38 3 41 40\n40 25 15 35 20 28 44 6 11 45\n20 6 33 29 30 49 50 25 28 1\n11 25 20 33 29 50 38 4 1 28\n25 20 35 15 28 11 1 30 33 44\n25 30 42 1 44 15 45 41 24 38\n25 20 35 50 3 24 28 12 33 41\n30 14 1 44 41 21 42 3 45 36\n" }, { "path": "programming_assignments/mini_reco/testcase/output/output004.txt", "content": "40 24 47 45 66 32 41 69 27 42\n40 46 42 30 49 47 61 63 64 43\n24 70 64 56 63 65 60 66 47 61\n24 48 12 42 50 63 30 64 67 52\n24 63 46 30 61 42 64 47 17 65\n55 56 67 12 42 36 53 58 37 63\n40 66 33 46 53 60 30 13 57 64\n50 24 12 66 48 36 53 57 14 40\n37 64 27 56 47 46 29 66 39 48\n47 48 58 50 66 56 52 39 14 40\n27 40 24 17 52 12 65 60 37 46\n14 26 24 27 48 70 29 66 33 40\n24 37 27 69 47 48 50 70 35 36\n48 57 40 58 42 47 69 32 7 29\n12 24 67 39 56 43 17 29 28 25\n48 31 57 27 58 6 37 66 46 69\n40 47 66 41 42 43 37 67 31 53\n47 66 41 69 30 24 37 27 52 28\n69 66 68 56 59 50 24 55 48 42\n33 12 17 27 24 60 63 64 47 61\n66 50 21 14 48 33 67 26 47 24\n27 40 12 70 24 25 67 29 30 28\n30 46 17 36 63 61 64 37 70 42\n15 12 70 24 47 17 28 43 25 65\n56 70 66 31 69 47 30 50 63 64\n57 27 43 24 50 48 12 30 63 66\n50 53 70 47 68 6 55 41 26 1\n69 24 32 64 67 40 63 28 60 52\n24 40 27 26 12 33 63 30 61 42\n50 24 42 40 6 63 64 36 30 70\n" }, { "path": "programming_assignments/mini_reco/testcase/output/output005.txt", "content": "55 66 17 40 52 12 48 46 36 70 60 57 53 42 30\n27 40 12 60 42 17 63 70 30 43 24 61 56 69 64\n40 50 57 69 48 30 37 47 64 63 60 28 61 35 65\n12 24 40 66 39 42 43 67 70 56 28 31 53 35 51\n58 47 48 50 27 66 36 64 56 70 30 25 31 46 60\n48 57 58 30 32 70 66 69 43 27 29 31 40 39 42\n24 69 42 30 63 70 65 64 66 46 31 33 61 36 67\n40 37 46 66 48 58 64 29 56 70 41 17 36 50 43\n40 42 47 29 46 50 41 13 36 14 43 8 60 31 65\n68 56 69 59 66 42 47 12 41 29 30 61 63 64 36\n70 27 40 24 52 25 31 60 35 6 47 26 30 57 69\n69 42 40 37 12 26 67 70 36 29 63 30 43 33 64\n24 27 33 40 66 48 58 42 46 14 53 60 43 63 28\n40 30 42 46 47 61 63 64 65 36 56 31 60 70 43\n12 24 42 40 53 39 36 31 66 25 27 67 70 69 47\n37 27 66 24 8 42 56 26 13 57 60 25 14 21 41\n12 27 40 33 24 17 26 30 63 60 36 61 46 1 70\n24 50 48 40 27 58 70 36 66 26 6 56 47 64 30\n27 12 17 46 24 36 42 43 67 25 53 60 11 58 31\n40 50 30 48 47 42 60 31 37 26 61 43 65 20 41\n12 24 42 40 27 47 63 58 37 64 43 26 60 48 61\n27 24 12 33 40 50 70 14 66 26 35 53 32 43 58\n24 40 63 30 64 33 61 66 65 70 60 31 25 13 14\n12 24 40 46 65 56 36 42 27 67 47 17 69 55 53\n12 27 40 24 17 30 33 63 65 61 26 60 64 43 25\n37 66 33 50 27 48 57 69 24 25 67 14 36 41 31\n48 12 40 52 39 66 24 29 61 63 65 42 32 46 7\n12 46 66 58 36 17 42 37 56 70 43 25 48 47 60\n12 66 65 56 36 43 17 47 67 31 53 35 52 26 55\n12 42 27 24 40 65 17 25 46 39 43 28 35 13 47\n" }, { "path": "programming_assignments/mini_reco/testcase/output/output006.txt", "content": "48 57 37 66 24 30 42 26 41 13 63 64\n37 66 48 69 24 41 50 30 33 42 5 14\n46 43 39 60 53 69 6 66 26 49 51 13\n70 55 68 56 12 42 69 27 67 40 39 53\n12 24 27 46 40 66 31 30 43 36 42 52\n47 56 66 48 58 41 33 29 42 68 14 50\n46 52 24 42 63 30 17 59 67 61 64 12\n24 12 42 31 40 36 70 52 53 56 69 47\n12 27 66 25 24 36 17 63 42 70 67 46\n12 27 40 24 70 36 13 15 30 65 43 46\n48 40 58 47 57 42 66 36 56 17 46 63\n27 68 56 59 40 57 69 46 48 12 66 37\n42 40 70 29 56 46 55 63 30 6 53 26\n36 24 66 27 43 26 39 70 29 17 67 12\n12 24 42 40 66 46 67 39 52 29 70 69\n12 24 27 70 42 28 36 25 67 29 35 66\n46 40 56 66 48 58 42 37 17 47 29 68\n47 37 48 66 57 14 24 21 56 42 27 28\n12 24 52 56 27 67 17 25 42 28 66 55\n70 50 69 60 66 46 13 47 33 25 31 35\n27 24 40 12 25 29 63 14 61 37 64 50\n47 33 24 66 13 48 58 56 50 57 27 36\n40 24 12 66 50 31 39 35 25 67 47 27\n37 50 24 66 48 27 14 26 7 41 53 25\n40 57 58 48 42 33 47 36 66 69 60 46\n24 12 17 27 66 36 64 46 47 33 70 63\n48 37 58 27 66 56 52 14 8 43 49 39\n47 48 24 66 57 33 56 13 26 25 14 49\n27 37 48 24 33 70 28 29 41 60 57 13\n48 58 37 50 66 26 47 14 42 27 60 57\n" }, { "path": "publications/sigir2023-update-period/README.md", "content": "## Summary\n\nWe publish these real industry data sets across various domains from one of the largest web services companies in Korea. The dataset is crawled from the user-item interaction log at specific intervals.\n\nEach dataset is a sequence of matrices based on a specific period. The matrix is formed in [Matrix Market](https://math.nist.gov/MatrixMarket/formats.html) format.\n\n\nTraining data and evaluation data are designed to form cycles, which is described as follows. \n\n\nIf it is explained based on one interval, matrix data was created as logs for various periods of training data, and matrix data was created as evaluation data from data after the training data period. In the next section, training data includes the past evaluation data period, and in the current section, new evaluation data is generated with data after the training data period. In this way, a data set was generated as a matrix sequence of training and evaluation data at 8 intervals per cycle.\n\n```\n{A Service}\n├── train-matrix\n│ ├── 0\n│ ├── 1\n│ ├── 2\n...\n│ └── 8\n└── validation-matrix\n ├── 0\n ├── 1\n ├── 2\n ...\n └── 8\n```\n\n> Note that Each time period denotes one days other than Article domain. In Article domain, each time period denotes 4 hours.\n\nAn interval contains a matrix with [Matrix Market](https://math.nist.gov/MatrixMarket/formats.html) format, and files containing user ID and item ID information. The actual pseudonymized id values in the `uid` and `iid` files are written to the lines corresponding to the id values of users and entries used in the Matrix Martix format.\n```\n{A Service/[train|validation]-matrix}\n└── {interval-index}\n ├── iid\n ├── main.mtx\n └── uid\n```\n\n> Please note that datasets are item click logs, not purchase information. Additionally, users/products are pseudonymized with random numbers to avoid restoration.\n\n## Download Link\nDatasets are publicly available for download at [link: https://kko.to/data-sigir2023](https://kko.to/data-sigir2023)\n\n## Citation\n\nTo acknowledge use of the dataset in publications, please cite the following paper:\n\nHyunsung Lee*, Sungwook Yoo*, Dongjun Lee, and Jaekwang Kim. **How Important is Periodic Model Update in Recommender Systems?** In Proceedings of the 46th International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR ’23), July 23–27, 2023, Taipei, Tai-wan. https://doi.org/10.1145/3539618.3591934\n\n## Article\n\n### Description\n\nThis dataset consists of click logs collected from the home feed of articles such as news and other kinds of web pages in South Korea. Please note that the time period for each interval in Article is 4 hours. This is because, in Article domain, old items become obsolete fast.\n\n## Blog\n\n### Description\n\nThis dataset consists of click logs from a blog service. The logs contain click logs of recommended blog postings from users presented on the main page of the web page of the service.\n\n## Comics\n\n### Description\n\nThis dataset consists of click logs from a comics service. New episodes of comics are uploaded mostly once a week. Different comics are updated on different weekdays.\n\n## Commerce\n\n### Description\nThis domain is to buy gifts for other people in a social network service. Logs contain view logs of users to items. \n\n## Statistics of Datasets\n\nThe Average Data statistics of different domains over different time periods are as follows. We only include statistics of average values over training datasets and validation datasets. Dataset characteristics do not show abrupt changes in different time periods.\n\n|domain|log_type|users|items|interactions|sparsity|\n|---|-------|------|-----|------------|--------|\t\t\n|article|train|493.9K|14.2K|117.8M|0.2544|\n|article|validation|\t193.2K\t|3.9K | 2.39M |0.3150|\n|blog|\ttrain|\t54.5K|\t164.5K\t| 515K |\t0.0057|\n|blog|validation|\t6.3K|\t32.6K|\t52K\t|0.0262|\n|comics|train|\t279.2K|\t1.65K|\t2819K\t|0.6120|\n|comics|validation|77.6K|\t1.6K|\t471K\t|0.3796|\n|commerce\t|train|\t779.1K|\t278.9K\t|5560K|\t0.0026|\n|commerce|validation|58.3K|\t93.1K|\t329K\t|0.0061|\n\n## License\n\nThis is a statement regarding the license to release the dataset. The following bullet points outline the terms and conditions of use:\n\n* Ownership: Kakao Corporation is the rightful owner of the dataset.\nAvailability: The dataset is available for non-commercial use only.\n* User's responsibilities: The user is responsible for following all copyright and legal regulations when using the dataset.\n* Prior approval: If the dataset is being used for commercial purposes or being cited or redistributed, it requires approval from Kakao Corporation.\n* Accuracy: Kakao Corporation does not guarantee the accuracy, suitability, or validity of the dataset for any other purpose.\n* No warranties: Kakao Corporation provides no warranties or representations regarding the dataset, and the user may not indicate any endorsement from the company.\n* Limitation of liability: The user assumes all responsibility for using the dataset and is solely responsible for any consequences arising from its use. Kakao Corporation is exempted from liability for use.\n* The user must acknowledge the use of the data set in publications resulting from the use of the data set (see the citation information above).\n" } ]