Repository: meta-llama/llama
Branch: main
Commit: 689c7f261b9c
Files: 18
Total size: 84.9 KB

Directory structure:
gitextract_aqbuu_lt/

├── .github/
│   └── ISSUE_TEMPLATE/
│       └── bug_report.md
├── .gitignore
├── CODE_OF_CONDUCT.md
├── CONTRIBUTING.md
├── LICENSE
├── MODEL_CARD.md
├── README.md
├── UPDATES.md
├── USE_POLICY.md
├── download.sh
├── example_chat_completion.py
├── example_text_completion.py
├── llama/
│   ├── __init__.py
│   ├── generation.py
│   ├── model.py
│   └── tokenizer.py
├── requirements.txt
└── setup.py

================================================
FILE CONTENTS
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================================================
FILE: .github/ISSUE_TEMPLATE/bug_report.md
================================================
---
name: Bug report
about: Create a report to help us reproduce and fix the issue
title: ''
labels: ''
assignees: ''

---

**Before submitting a bug, please make sure the issue hasn't been already addressed by searching through the [FAQs](https://ai.meta.com/llama/faq/) and [existing/past issues](https://github.com/facebookresearch/llama/issues)**

## Describe the bug
<Please provide a clear and concise description of what the bug is. If relevant, please include a _minimal_ (least lines of code necessary) _reproducible_ (running this will give us the same result as you get) code snippet. Make sure to include the relevant imports.>

### Minimal reproducible example
<Remember to wrap the code in ```` ```triple-quotes blocks``` ````>

```python
# sample code to repro the bug
```

### Output
<Remember to wrap the output in ```` ```triple-quotes blocks``` ````>

```
<paste stacktrace and other outputs here>
```

## Runtime Environment
- Model: [eg: `llama-2-7b-chat`]
- Using via huggingface?: [yes/no]
- OS: [eg. Linux/Ubuntu, Windows]
- GPU VRAM: 
- Number of GPUs:
- GPU Make: [eg: Nvidia, AMD, Intel]

**Additional context**
Add any other context about the problem or environment here.


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FILE: .gitignore
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# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
__pypackages__/

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#.idea/

================================================
FILE: CODE_OF_CONDUCT.md
================================================
# Code of Conduct

## Our Pledge

In the interest of fostering an open and welcoming environment, we as
contributors and maintainers pledge to make participation in our project and
our community a harassment-free experience for everyone, regardless of age, body
size, disability, ethnicity, sex characteristics, gender identity and expression,
level of experience, education, socio-economic status, nationality, personal
appearance, race, religion, or sexual identity and orientation.

## Our Standards

Examples of behavior that contributes to creating a positive environment
include:

* Using welcoming and inclusive language
* Being respectful of differing viewpoints and experiences
* Gracefully accepting constructive criticism
* Focusing on what is best for the community
* Showing empathy towards other community members

Examples of unacceptable behavior by participants include:

* The use of sexualized language or imagery and unwelcome sexual attention or
advances
* Trolling, insulting/derogatory comments, and personal or political attacks
* Public or private harassment
* Publishing others' private information, such as a physical or electronic
address, without explicit permission
* Other conduct which could reasonably be considered inappropriate in a
professional setting

## Our Responsibilities

Project maintainers are responsible for clarifying the standards of acceptable
behavior and are expected to take appropriate and fair corrective action in
response to any instances of unacceptable behavior.

Project maintainers have the right and responsibility to remove, edit, or
reject comments, commits, code, wiki edits, issues, and other contributions
that are not aligned to this Code of Conduct, or to ban temporarily or
permanently any contributor for other behaviors that they deem inappropriate,
threatening, offensive, or harmful.

## Scope

This Code of Conduct applies within all project spaces, and it also applies when
an individual is representing the project or its community in public spaces.
Examples of representing a project or community include using an official
project e-mail address, posting via an official social media account, or acting
as an appointed representative at an online or offline event. Representation of
a project may be further defined and clarified by project maintainers.

This Code of Conduct also applies outside the project spaces when there is a
reasonable belief that an individual's behavior may have a negative impact on
the project or its community.

## Enforcement

Instances of abusive, harassing, or otherwise unacceptable behavior may be
reported by contacting the project team at <opensource-conduct@meta.com>. All
complaints will be reviewed and investigated and will result in a response that
is deemed necessary and appropriate to the circumstances. The project team is
obligated to maintain confidentiality with regard to the reporter of an incident.
Further details of specific enforcement policies may be posted separately.

Project maintainers who do not follow or enforce the Code of Conduct in good
faith may face temporary or permanent repercussions as determined by other
members of the project's leadership.

## Attribution

This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html

[homepage]: https://www.contributor-covenant.org

For answers to common questions about this code of conduct, see
https://www.contributor-covenant.org/faq

================================================
FILE: CONTRIBUTING.md
================================================
# Contributing to Llama
We want to make contributing to this project as easy and transparent as
possible.

## Pull Requests
We welcome your pull requests.

### For requests regarding bug-fixes or improvements to the core model:

1. Fork the repo and create your branch from `main`.
2. If you've added code that should be tested, add tests.
3. If you've changed APIs, update the documentation.
4. Ensure the test suite passes.
5. Make sure your code lints.
6. If you haven't already, complete the Contributor License Agreement ("CLA").

### For requests regarding new feature support, adding additional platform support and model use cases, please contribute to the [llama-recipes repo](https://github.com/facebookresearch/llama-recipes).
<br><br>


## Contributor License Agreement ("CLA")
In order to accept your pull request, we need you to submit a CLA. You only need
to do this once to work on any of Meta's open source projects.

Complete your CLA here: <https://code.facebook.com/cla>

## Issues
We use GitHub issues to track public bugs. Please ensure your description is
clear and has sufficient instructions to be able to reproduce the issue.

Meta has a [bounty program](https://www.facebook.com/whitehat/) for the safe
disclosure of security bugs. In those cases, please go through the process
outlined on that page and do not file a public issue.

## License
By contributing to Llama, you agree that your contributions will be licensed
under the LICENSE file in the root directory of this source tree.

================================================
FILE: LICENSE
================================================
LLAMA 2 COMMUNITY LICENSE AGREEMENT	
Llama 2 Version Release Date: July 18, 2023

"Agreement" means the terms and conditions for use, reproduction, distribution and 
modification of the Llama Materials set forth herein.

"Documentation" means the specifications, manuals and documentation 
accompanying Llama 2 distributed by Meta at ai.meta.com/resources/models-and-
libraries/llama-downloads/.

"Licensee" or "you" means you, or your employer or any other person or entity (if 
you are entering into this Agreement on such person or entity's behalf), of the age 
required under applicable laws, rules or regulations to provide legal consent and that 
has legal authority to bind your employer or such other person or entity if you are 
entering in this Agreement on their behalf.

"Llama 2" means the foundational large language models and software and 
algorithms, including machine-learning model code, trained model weights, 
inference-enabling code, training-enabling code, fine-tuning enabling code and other 
elements of the foregoing distributed by Meta at ai.meta.com/resources/models-and-
libraries/llama-downloads/.

"Llama Materials" means, collectively, Meta's proprietary Llama 2 and 
Documentation (and any portion thereof) made available under this Agreement.

"Meta" or "we" means Meta Platforms Ireland Limited (if you are located in or, if you 
are an entity, your principal place of business is in the EEA or Switzerland) and Meta 
Platforms, Inc. (if you are located outside of the EEA or Switzerland). 

By clicking "I Accept" below or by using or distributing any portion or element of the 
Llama Materials, you agree to be bound by this Agreement.

1. License Rights and Redistribution. 

      a. Grant of Rights. You are granted a non-exclusive, worldwide, non-
transferable and royalty-free limited license under Meta's intellectual property or 
other rights owned by Meta embodied in the Llama Materials to use, reproduce, 
distribute, copy, create derivative works of, and make modifications to the Llama 
Materials.  
      
      b. Redistribution and Use.  

            i. If you distribute or make the Llama Materials, or any derivative works 
thereof, available to a third party, you shall provide a copy of this Agreement to such 
third party. 
            ii.  If you receive Llama Materials, or any derivative works thereof, from 
a Licensee as part of an integrated end user product, then Section 2 of this 
Agreement will not apply to you. 

            iii. You must retain in all copies of the Llama Materials that you 
distribute the following attribution notice within a "Notice" text file distributed as a 
part of such copies: "Llama 2 is licensed under the LLAMA 2 Community License, 
Copyright (c) Meta Platforms, Inc. All Rights Reserved."

            iv. Your use of the Llama Materials must comply with applicable laws 
and regulations (including trade compliance laws and regulations) and adhere to the 
Acceptable Use Policy for the Llama Materials (available at 
https://ai.meta.com/llama/use-policy), which is hereby incorporated by reference into 
this Agreement.

            v. You will not use the Llama Materials or any output or results of the 
Llama Materials to improve any other large language model (excluding Llama 2 or 
derivative works thereof).  

2. Additional Commercial Terms. If, on the Llama 2 version release date, the 
monthly active users of the products or services made available by or for Licensee, 
or Licensee's affiliates, is greater than 700 million monthly active users in the 
preceding calendar month, you must request a license from Meta, which Meta may 
grant to you in its sole discretion, and you are not authorized to exercise any of the 
rights under this Agreement unless or until Meta otherwise expressly grants you 
such rights.
            
3. Disclaimer of Warranty. UNLESS REQUIRED BY APPLICABLE LAW, THE 
LLAMA MATERIALS AND ANY OUTPUT AND RESULTS THEREFROM ARE 
PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, 
EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY 
WARRANTIES OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY, OR 
FITNESS FOR A PARTICULAR PURPOSE. YOU ARE SOLELY RESPONSIBLE 
FOR DETERMINING THE APPROPRIATENESS OF USING OR REDISTRIBUTING 
THE LLAMA MATERIALS AND ASSUME ANY RISKS ASSOCIATED WITH YOUR 
USE OF THE LLAMA MATERIALS AND ANY OUTPUT AND RESULTS.

4. Limitation of Liability. IN NO EVENT WILL META OR ITS AFFILIATES BE 
LIABLE UNDER ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, TORT, 
NEGLIGENCE, PRODUCTS LIABILITY, OR OTHERWISE, ARISING OUT OF THIS 
AGREEMENT, FOR ANY LOST PROFITS OR ANY INDIRECT, SPECIAL, 
CONSEQUENTIAL, INCIDENTAL, EXEMPLARY OR PUNITIVE DAMAGES, EVEN 
IF META OR ITS AFFILIATES HAVE BEEN ADVISED OF THE POSSIBILITY OF 
ANY OF THE FOREGOING.
 
5. Intellectual Property.

      a. No trademark licenses are granted under this Agreement, and in 
connection with the Llama Materials, neither Meta nor Licensee may use any name 
or mark owned by or associated with the other or any of its affiliates, except as 
required for reasonable and customary use in describing and redistributing the 
Llama Materials.

      b. Subject to Meta's ownership of Llama Materials and derivatives made by or 
for Meta, with respect to any derivative works and modifications of the Llama 
Materials that are made by you, as between you and Meta, you are and will be the 
owner of such derivative works and modifications.

      c. If you institute litigation or other proceedings against Meta or any entity 
(including a cross-claim or counterclaim in a lawsuit) alleging that the Llama 
Materials or Llama 2 outputs or results, or any portion of any of the foregoing, 
constitutes an infringement of intellectual property or other rights owned or licensable 
by you, then any licenses granted to you under this Agreement shall terminate as of 
the date such litigation or claim is filed or instituted. You will indemnify and hold 
harmless Meta from and against any claim by any third party arising out of or related 
to your use or distribution of the Llama Materials.

6. Term and Termination. The term of this Agreement will commence upon your 
acceptance of this Agreement or access to the Llama Materials and will continue in 
full force and effect until terminated in accordance with the terms and conditions 
herein. Meta may terminate this Agreement if you are in breach of any term or 
condition of this Agreement. Upon termination of this Agreement, you shall delete 
and cease use of the Llama Materials. Sections 3, 4 and 7 shall survive the 
termination of this Agreement. 

7. Governing Law and Jurisdiction. This Agreement will be governed and 
construed under the laws of the State of California without regard to choice of law 
principles, and the UN Convention on Contracts for the International Sale of Goods 
does not apply to this Agreement. The courts of California shall have exclusive 
jurisdiction of any dispute arising out of this Agreement. 



================================================
FILE: MODEL_CARD.md
================================================
# **Model Details**

Meta developed and released the Llama 2 family of large language models (LLMs), a collection of pretrained and fine-tuned generative text models ranging in scale from 7 billion to 70 billion parameters. Our fine-tuned LLMs, called Llama-2-Chat, are optimized for dialogue use cases. Llama-2-Chat models outperform open-source chat models on most benchmarks we tested, and in our human evaluations for helpfulness and safety, are on par with some popular closed-source models like ChatGPT and PaLM.

**Model Developers** Meta

**Variations** Llama 2 comes in a range of parameter sizes — 7B, 13B, and 70B — as well as pretrained and fine-tuned variations.

**Input** Models input text only.

**Output** Models generate text only.

**Model Architecture** Llama 2 is an auto-regressive language model that uses an optimized transformer architecture. The tuned versions use supervised fine-tuning (SFT) and reinforcement learning with human feedback (RLHF) to align with human preferences for helpfulness and safety.

||Training Data|Params|Context Length|GQA|Tokens|LR|
|---|---|---|---|---|---|---|
Llama 2|*A new mix of publicly available online data*|7B|4k|&#10007;|2.0T|3.0 x 10<sup>-4</sup>
Llama 2|*A new mix of publicly available online data*|13B|4k|&#10007;|2.0T|3.0 x 10<sup>-4</sup>
Llama 2|*A new mix of publicly available online data*|70B|4k|&#10004;|2.0T|1.5 x 10<sup>-4</sup>

**Llama 2 family of models.** Token counts refer to pretraining data only. All models are trained with a global batch-size of 4M tokens. The 70B version uses Grouped-Query Attention (GQA) for improved inference scalability.

**Model Dates** Llama 2 was trained between January 2023 and July 2023.

**Status** This is a static model trained on an offline dataset. Future versions of the tuned models will be released as we improve model safety with community feedback.

**License** A custom commercial license is available at: [https://ai.meta.com/resources/models-and-libraries/llama-downloads/](https://ai.meta.com/resources/models-and-libraries/llama-downloads/)

**Research Paper** More information can be found in the paper "Llama-2: Open Foundation and Fine-tuned Chat Models", available at https://ai.meta.com/research/publications/llama-2-open-foundation-and-fine-tuned-chat-models/.

**Where to send questions or comments about the model** Instructions on how to provide feedback or comments on the model can be found in the model [README](README.md).

# **Intended Use**
**Intended Use Cases** Llama 2 is intended for commercial and research use in English. Tuned models are intended for assistant-like chat, whereas pretrained models can be adapted for a variety of natural language generation tasks.

**Out-of-scope Uses** Use in any manner that violates applicable laws or regulations (including trade compliance laws). Use in any other way that is prohibited by the Acceptable Use Policy and Llama 2 Community License. Use in languages other than English**. 

**Note: Developers may fine-tune Llama 2 models for languages beyond English provided they comply with the Llama 2 Community License and the Acceptable Use Policy.

# **Hardware and Software**
**Training Factors** We used custom training libraries, Meta's Research Super Cluster, and production clusters for pretraining. Fine-tuning, annotation, and evaluation were also performed on third-party cloud compute.

**Carbon Footprint** Pretraining utilized a cumulative 3.3M GPU hours of computation on hardware of type A100-80GB (TDP of 350-400W). Estimated total emissions were 539 tCO2eq, 100% of which were offset by Meta’s sustainability program.

||Time (GPU hours)|Power Consumption (W)|Carbon Emitted(tCO<sub>2</sub>eq)|
|---|---|---|---|
|Llama 2 7B|184320|400|31.22|
|Llama 2 13B|368640|400|62.44|
|Llama 2 70B|1720320|400|291.42|
|Total|3311616||539.00|

**CO<sub>2</sub> emissions during pretraining.** Time: total GPU time required for training each model. Power Consumption: peak power capacity per GPU device for the GPUs used adjusted for power usage efficiency. 100% of the emissions are directly offset by Meta's sustainability program, and because we are openly releasing these models, the pretraining costs do not need to be incurred by others.

# **Training Data**
**Overview** Llama 2 was pretrained on 2 trillion tokens of data from publicly available sources. The fine-tuning data includes publicly available instruction datasets, as well as over one million new human-annotated examples. Neither the pretraining nor the fine-tuning datasets include Meta user data.

**Data Freshness** The pretraining data has a cutoff of September 2022, but some tuning data is more recent, up to July 2023.

# **Evaluation Results**

In this section, we report the results for the Llama 1 and Llama 2 models on standard academic benchmarks.
For all the evaluations, we use our internal evaluations library.

|Model|Size|Code|Commonsense Reasoning|World Knowledge|Reading Comprehension|Math|MMLU|BBH|AGI Eval|
|---|---|---|---|---|---|---|---|---|---|
|Llama 1|7B|14.1|60.8|46.2|58.5|6.95|35.1|30.3|23.9|
|Llama 1|13B|18.9|66.1|52.6|62.3|10.9|46.9|37.0|33.9|
|Llama 1|33B|26.0|70.0|58.4|67.6|21.4|57.8|39.8|41.7|
|Llama 1|65B|30.7|70.7|60.5|68.6|30.8|63.4|43.5|47.6|
|Llama 2|7B|16.8|63.9|48.9|61.3|14.6|45.3|32.6|29.3|
|Llama 2|13B|24.5|66.9|55.4|65.8|28.7|54.8|39.4|39.1|
|Llama 2|70B|**37.5**|**71.9**|**63.6**|**69.4**|**35.2**|**68.9**|**51.2**|**54.2**|

**Overall performance on grouped academic benchmarks.** *Code:* We report the average pass@1 scores of our models on HumanEval and MBPP. *Commonsense Reasoning:* We report the average of PIQA, SIQA, HellaSwag, WinoGrande, ARC easy and challenge, OpenBookQA, and CommonsenseQA. We report 7-shot results for CommonSenseQA and 0-shot results for all other benchmarks. *World Knowledge:* We evaluate the 5-shot performance on NaturalQuestions and TriviaQA and report the average. *Reading Comprehension:* For reading comprehension, we report the 0-shot average on SQuAD, QuAC, and BoolQ. *MATH:* We report the average of the GSM8K (8 shot) and MATH (4 shot) benchmarks at the top 1.

|||TruthfulQA|Toxigen|
|---|---|---|---|
|Llama 1|7B|27.42|23.00|
|Llama 1|13B|41.74|23.08|
|Llama 1|33B|44.19|22.57|
|Llama 1|65B|48.71|21.77|
|Llama 2|7B|33.29|**21.25**|
|Llama 2|13B|41.86|26.10|
|Llama 2|70B|**50.18**|24.60|

**Evaluation of pretrained LLMs on automatic safety benchmarks.** For TruthfulQA, we present the percentage of generations that are both truthful and informative (the higher the better). For ToxiGen, we present the percentage of toxic generations (the smaller the better).


|||TruthfulQA|Toxigen|
|---|---|---|---|
|Llama-2-Chat|7B|57.04|**0.00**|
|Llama-2-Chat|13B|62.18|**0.00**|
|Llama-2-Chat|70B|**64.14**|0.01|

**Evaluation of fine-tuned LLMs on different safety datasets.** Same metric definitions as above.

# **Ethical Considerations and Limitations**
Llama 2 is a new technology that carries risks with use. Testing conducted to date has been in English, and has not covered, nor could it cover all scenarios. For these reasons, as with all LLMs, Llama 2’s potential outputs cannot be predicted in advance, and the model may in some instances produce inaccurate, biased or other objectionable responses to user prompts. Therefore, before deploying any applications of Llama 2, developers should perform safety testing and tuning tailored to their specific applications of the model.

Please see the Responsible Use Guide available at [https://ai.meta.com/llama/responsible-use-guide/](https://ai.meta.com/llama/responsible-use-guide/)


================================================
FILE: README.md
================================================
## **Note of deprecation**

Thank you for developing with Llama models. As part of the Llama 3.1 release, we’ve consolidated GitHub repos and added some additional repos as we’ve expanded Llama’s functionality into being an e2e Llama Stack. Please use the following repos going forward:
- [llama-models](https://github.com/meta-llama/llama-models) - Central repo for the foundation models including basic utilities, model cards, license and use policies
- [PurpleLlama](https://github.com/meta-llama/PurpleLlama) - Key component of Llama Stack focusing on safety risks and inference time mitigations 
- [llama-toolchain](https://github.com/meta-llama/llama-toolchain) - Model development (inference/fine-tuning/safety shields/synthetic data generation) interfaces and canonical implementations
- [llama-agentic-system](https://github.com/meta-llama/llama-agentic-system) - E2E standalone Llama Stack system, along with opinionated underlying interface, that enables creation of agentic applications
- [llama-cookbook](https://github.com/meta-llama/llama-recipes) - Community driven scripts and integrations

If you have any questions, please feel free to file an issue on any of the above repos and we will do our best to respond in a timely manner. 

Thank you!


# (Deprecated) Llama 2

We are unlocking the power of large language models. Llama 2 is now accessible to individuals, creators, researchers, and businesses of all sizes so that they can experiment, innovate, and scale their ideas responsibly. 

This release includes model weights and starting code for pre-trained and fine-tuned Llama language models — ranging from 7B to 70B parameters.

This repository is intended as a minimal example to load [Llama 2](https://ai.meta.com/research/publications/llama-2-open-foundation-and-fine-tuned-chat-models/) models and run inference. For more detailed examples leveraging Hugging Face, see [llama-cookbook](https://github.com/facebookresearch/llama-recipes/).

## Updates post-launch

See [UPDATES.md](UPDATES.md). Also for a running list of frequently asked questions, see [here](https://ai.meta.com/llama/faq/).

## Download

In order to download the model weights and tokenizer, please visit the [Meta website](https://ai.meta.com/resources/models-and-libraries/llama-downloads/) and accept our License.

Once your request is approved, you will receive a signed URL over email. Then run the download.sh script, passing the URL provided when prompted to start the download.

Pre-requisites: Make sure you have `wget` and `md5sum` installed. Then run the script: `./download.sh`.

Keep in mind that the links expire after 24 hours and a certain amount of downloads. If you start seeing errors such as `403: Forbidden`, you can always re-request a link.

### Access to Hugging Face

We are also providing downloads on [Hugging Face](https://huggingface.co/meta-llama). You can request access to the models by acknowledging the license and filling the form in the model card of a repo. After doing so, you should get access to all the Llama models of a version (Code Llama, Llama 2, or Llama Guard) within 1 hour.

## Quick Start

You can follow the steps below to quickly get up and running with Llama 2 models. These steps will let you run quick inference locally. For more examples, see the [Llama 2 cookbook repository](https://github.com/facebookresearch/llama-recipes). 

1. In a conda env with PyTorch / CUDA available clone and download this repository.

2. In the top-level directory run:
    ```bash
    pip install -e .
    ```
3. Visit the [Meta website](https://ai.meta.com/resources/models-and-libraries/llama-downloads/) and register to download the model/s.

4. Once registered, you will get an email with a URL to download the models. You will need this URL when you run the download.sh script.

5. Once you get the email, navigate to your downloaded llama repository and run the download.sh script. 
    - Make sure to grant execution permissions to the download.sh script
    - During this process, you will be prompted to enter the URL from the email. 
    - Do not use the “Copy Link” option but rather make sure to manually copy the link from the email.

6. Once the model/s you want have been downloaded, you can run the model locally using the command below:
```bash
torchrun --nproc_per_node 1 example_chat_completion.py \
    --ckpt_dir llama-2-7b-chat/ \
    --tokenizer_path tokenizer.model \
    --max_seq_len 512 --max_batch_size 6
```
**Note**
- Replace  `llama-2-7b-chat/` with the path to your checkpoint directory and `tokenizer.model` with the path to your tokenizer model.
- The `–nproc_per_node` should be set to the [MP](#inference) value for the model you are using.
- Adjust the `max_seq_len` and `max_batch_size` parameters as needed.
- This example runs the [example_chat_completion.py](example_chat_completion.py) found in this repository but you can change that to a different .py file.

## Inference

Different models require different model-parallel (MP) values:

|  Model | MP |
|--------|----|
| 7B     | 1  |
| 13B    | 2  |
| 70B    | 8  |

All models support sequence length up to 4096 tokens, but we pre-allocate the cache according to `max_seq_len` and `max_batch_size` values. So set those according to your hardware.

### Pretrained Models

These models are not finetuned for chat or Q&A. They should be prompted so that the expected answer is the natural continuation of the prompt.

See `example_text_completion.py` for some examples. To illustrate, see the command below to run it with the llama-2-7b model (`nproc_per_node` needs to be set to the `MP` value):

```
torchrun --nproc_per_node 1 example_text_completion.py \
    --ckpt_dir llama-2-7b/ \
    --tokenizer_path tokenizer.model \
    --max_seq_len 128 --max_batch_size 4
```

### Fine-tuned Chat Models

The fine-tuned models were trained for dialogue applications. To get the expected features and performance for them, a specific formatting defined in [`chat_completion`](https://github.com/facebookresearch/llama/blob/main/llama/generation.py#L212)
needs to be followed, including the `INST` and `<<SYS>>` tags, `BOS` and `EOS` tokens, and the whitespaces and breaklines in between (we recommend calling `strip()` on inputs to avoid double-spaces).

You can also deploy additional classifiers for filtering out inputs and outputs that are deemed unsafe. See the llama-cookbook repo for [an example](https://github.com/facebookresearch/llama-recipes/blob/main/examples/inference.py) of how to add a safety checker to the inputs and outputs of your inference code.

Examples using llama-2-7b-chat:

```
torchrun --nproc_per_node 1 example_chat_completion.py \
    --ckpt_dir llama-2-7b-chat/ \
    --tokenizer_path tokenizer.model \
    --max_seq_len 512 --max_batch_size 6
```

Llama 2 is a new technology that carries potential risks with use. Testing conducted to date has not — and could not — cover all scenarios.
In order to help developers address these risks, we have created the [Responsible Use Guide](Responsible-Use-Guide.pdf). More details can be found in our research paper as well.

## Issues

Please report any software “bug”, or other problems with the models through one of the following means:
- Reporting issues with the model: [github.com/facebookresearch/llama](http://github.com/facebookresearch/llama)
- Reporting risky content generated by the model: [developers.facebook.com/llama_output_feedback](http://developers.facebook.com/llama_output_feedback)
- Reporting bugs and security concerns: [facebook.com/whitehat/info](http://facebook.com/whitehat/info)

## Model Card
See [MODEL_CARD.md](MODEL_CARD.md).

## License

Our model and weights are licensed for both researchers and commercial entities, upholding the principles of openness. Our mission is to empower individuals, and industry through this opportunity, while fostering an environment of discovery and ethical AI advancements. 

See the [LICENSE](LICENSE) file, as well as our accompanying [Acceptable Use Policy](USE_POLICY.md)

## References

1. [Research Paper](https://ai.meta.com/research/publications/llama-2-open-foundation-and-fine-tuned-chat-models/)
2. [Llama 2 technical overview](https://ai.meta.com/resources/models-and-libraries/llama)
3. [Open Innovation AI Research Community](https://ai.meta.com/llama/open-innovation-ai-research-community/)

For common questions, the FAQ can be found [here](https://ai.meta.com/llama/faq/) which will be kept up to date over time as new questions arise. 

## Original Llama
The repo for the original llama release is in the [`llama_v1`](https://github.com/facebookresearch/llama/tree/llama_v1) branch.


================================================
FILE: UPDATES.md
================================================
# 8/7/23 Updates

## System Prompt Update

### Observed Issue
We received feedback from the community on our prompt template and we are providing an update to reduce the false refusal rates seen. False refusals occur when the model incorrectly refuses to answer a question that it should, for example due to overly broad instructions to be cautious in how it provides responses. 

### Updated approach
Based on evaluation and analysis, we recommend the removal of the system prompt as the default setting.  Pull request [#626](https://github.com/facebookresearch/llama/pull/626) removes the system prompt as the default option, but still provides an example to help enable experimentation for those using it. 

## Token Sanitization Update

### Observed Issue
The PyTorch scripts currently provided for tokenization and model inference allow for direct prompt injection via string concatenation. Prompt injections allow for the addition of special system and instruction prompt strings from user-provided prompts. 

As noted in the documentation, these strings are required to use the fine-tuned chat models. However, prompt injections have also been used for manipulating or abusing models by bypassing their safeguards, allowing for the creation of content or behaviors otherwise outside the bounds of acceptable use. 

### Updated approach
We recommend sanitizing [these strings](https://github.com/facebookresearch/llama#fine-tuned-chat-models) from any user provided prompts. Sanitization of user prompts mitigates malicious or accidental abuse of these strings. The provided scripts have been updated to do this. 

Note: even with this update safety classifiers should still be applied to catch unsafe behaviors or content produced by the model. An [example](https://github.com/facebookresearch/llama-recipes/blob/main/inference/inference.py) of how to deploy such a classifier can be found in the llama-recipes repository.


================================================
FILE: USE_POLICY.md
================================================
# Llama 2 Acceptable Use Policy

Meta is committed to promoting safe and fair use of its tools and features, including Llama 2. If you access or use Llama 2, you agree to this Acceptable Use Policy (“Policy”). The most recent copy of this policy can be found at [ai.meta.com/llama/use-policy](http://ai.meta.com/llama/use-policy).

## Prohibited Uses
We want everyone to use Llama 2 safely and responsibly. You agree you will not use, or allow others to use, Llama 2 to: 

1. Violate the law or others’ rights, including to:
    1. Engage in, promote, generate, contribute to, encourage, plan, incite, or further illegal or unlawful activity or content, such as: 
        1. Violence or terrorism 
        2. Exploitation or harm to children, including the solicitation, creation, acquisition, or dissemination of child exploitative content or failure to report Child Sexual Abuse Material
        3. Human trafficking, exploitation, and sexual violence
        4. The illegal distribution of information or materials to minors, including obscene materials, or failure to employ legally required age-gating in connection with such information or materials.
        5. Sexual solicitation
        6. Any other criminal activity
    2. Engage in, promote, incite, or facilitate the harassment, abuse, threatening, or bullying of individuals or groups of individuals
    3. Engage in, promote, incite, or facilitate discrimination or other unlawful or harmful conduct in the provision of employment, employment benefits, credit, housing, other economic benefits, or other essential goods and services
    4. Engage in the unauthorized or unlicensed practice of any profession including, but not limited to, financial, legal, medical/health, or related professional practices 
    5. Collect, process, disclose, generate, or infer health, demographic, or other sensitive personal or private information about individuals without rights and consents required by applicable laws
    6. Engage in or facilitate any action or generate any content that infringes, misappropriates, or otherwise violates any third-party rights, including the outputs or results of any products or services using the Llama 2 Materials
    7. Create, generate, or facilitate the creation of malicious code, malware, computer viruses or do anything else that could disable, overburden, interfere with or impair the proper working, integrity, operation or appearance of a website or computer system 



2. Engage in, promote, incite, facilitate, or assist in the planning or development of activities that present a risk of death or bodily harm to individuals, including use of Llama 2 related to the following:
    1. Military, warfare, nuclear industries or applications, espionage, use for materials or activities that are subject to the International Traffic Arms Regulations (ITAR) maintained by the United States Department of State
    2. Guns and illegal weapons (including weapon development)
    3. Illegal drugs and regulated/controlled substances
    4. Operation of critical infrastructure, transportation technologies, or heavy machinery
    5. Self-harm or harm to others, including suicide, cutting, and eating disorders
    6. Any content intended to incite or promote violence, abuse, or any infliction of bodily harm to an individual



3. Intentionally deceive or mislead others, including use of Llama 2 related to the following:
    1. Generating, promoting, or furthering fraud or the creation or promotion of disinformation
    2. Generating, promoting, or furthering defamatory content, including the creation of defamatory statements, images, or other content
    3. Generating, promoting, or further distributing spam
    4. Impersonating another individual without consent, authorization, or legal right
    5. Representing that the use of Llama 2 or outputs are human-generated
    6. Generating or facilitating false online engagement, including fake reviews and other means of fake online engagement 
4. Fail to appropriately disclose to end users any known dangers of your AI system 

Please report any violation of this Policy, software “bug,” or other problems that could lead to a violation of this Policy through one of the following means:

* Reporting issues with the model: [github.com/facebookresearch/llama](http://github.com/facebookresearch/llama)
* Reporting risky content generated by the model: [developers.facebook.com/llama_output_feedback](http://developers.facebook.com/llama_output_feedback)
* Reporting bugs and security concerns: [facebook.com/whitehat/info](http://facebook.com/whitehat/info)
* Reporting violations of the Acceptable Use Policy or unlicensed uses of Llama: [LlamaUseReport@meta.com](mailto:LlamaUseReport@meta.com)



================================================
FILE: download.sh
================================================
#!/usr/bin/env bash

# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

set -e

read -p "Enter the URL from email: " PRESIGNED_URL
echo ""
read -p "Enter the list of models to download without spaces (7B,13B,70B,7B-chat,13B-chat,70B-chat), or press Enter for all: " MODEL_SIZE
TARGET_FOLDER="."             # where all files should end up
mkdir -p ${TARGET_FOLDER}

if [[ $MODEL_SIZE == "" ]]; then
    MODEL_SIZE="7B,13B,70B,7B-chat,13B-chat,70B-chat"
fi

echo "Downloading LICENSE and Acceptable Usage Policy"
wget --continue ${PRESIGNED_URL/'*'/"LICENSE"} -O ${TARGET_FOLDER}"/LICENSE"
wget --continue ${PRESIGNED_URL/'*'/"USE_POLICY.md"} -O ${TARGET_FOLDER}"/USE_POLICY.md"

echo "Downloading tokenizer"
wget --continue ${PRESIGNED_URL/'*'/"tokenizer.model"} -O ${TARGET_FOLDER}"/tokenizer.model"
wget --continue ${PRESIGNED_URL/'*'/"tokenizer_checklist.chk"} -O ${TARGET_FOLDER}"/tokenizer_checklist.chk"
CPU_ARCH=$(uname -m)
  if [ "$CPU_ARCH" = "arm64" ]; then
    (cd ${TARGET_FOLDER} && md5 tokenizer_checklist.chk)
  else
    (cd ${TARGET_FOLDER} && md5sum -c tokenizer_checklist.chk)
  fi

for m in ${MODEL_SIZE//,/ }
do
    if [[ $m == "7B" ]]; then
        SHARD=0
        MODEL_PATH="llama-2-7b"
    elif [[ $m == "7B-chat" ]]; then
        SHARD=0
        MODEL_PATH="llama-2-7b-chat"
    elif [[ $m == "13B" ]]; then
        SHARD=1
        MODEL_PATH="llama-2-13b"
    elif [[ $m == "13B-chat" ]]; then
        SHARD=1
        MODEL_PATH="llama-2-13b-chat"
    elif [[ $m == "70B" ]]; then
        SHARD=7
        MODEL_PATH="llama-2-70b"
    elif [[ $m == "70B-chat" ]]; then
        SHARD=7
        MODEL_PATH="llama-2-70b-chat"
    fi

    echo "Downloading ${MODEL_PATH}"
    mkdir -p ${TARGET_FOLDER}"/${MODEL_PATH}"

    for s in $(seq -f "0%g" 0 ${SHARD})
    do
        wget --continue ${PRESIGNED_URL/'*'/"${MODEL_PATH}/consolidated.${s}.pth"} -O ${TARGET_FOLDER}"/${MODEL_PATH}/consolidated.${s}.pth"
    done

    wget --continue ${PRESIGNED_URL/'*'/"${MODEL_PATH}/params.json"} -O ${TARGET_FOLDER}"/${MODEL_PATH}/params.json"
    wget --continue ${PRESIGNED_URL/'*'/"${MODEL_PATH}/checklist.chk"} -O ${TARGET_FOLDER}"/${MODEL_PATH}/checklist.chk"
    echo "Checking checksums"
    CPU_ARCH=$(uname -m)
    if [[ "$CPU_ARCH" == "arm64" ]]; then
      (cd ${TARGET_FOLDER}"/${MODEL_PATH}" && md5 checklist.chk)
    else
      (cd ${TARGET_FOLDER}"/${MODEL_PATH}" && md5sum -c checklist.chk)
    fi
done


================================================
FILE: example_chat_completion.py
================================================
# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

from typing import List, Optional

import fire

from llama import Llama, Dialog


def main(
    ckpt_dir: str,
    tokenizer_path: str,
    temperature: float = 0.6,
    top_p: float = 0.9,
    max_seq_len: int = 512,
    max_batch_size: int = 8,
    max_gen_len: Optional[int] = None,
):
    """
    Entry point of the program for generating text using a pretrained model.

    Args:
        ckpt_dir (str): The directory containing checkpoint files for the pretrained model.
        tokenizer_path (str): The path to the tokenizer model used for text encoding/decoding.
        temperature (float, optional): The temperature value for controlling randomness in generation.
            Defaults to 0.6.
        top_p (float, optional): The top-p sampling parameter for controlling diversity in generation.
            Defaults to 0.9.
        max_seq_len (int, optional): The maximum sequence length for input prompts. Defaults to 512.
        max_batch_size (int, optional): The maximum batch size for generating sequences. Defaults to 8.
        max_gen_len (int, optional): The maximum length of generated sequences. If None, it will be
            set to the model's max sequence length. Defaults to None.
    """
    generator = Llama.build(
        ckpt_dir=ckpt_dir,
        tokenizer_path=tokenizer_path,
        max_seq_len=max_seq_len,
        max_batch_size=max_batch_size,
    )

    dialogs: List[Dialog] = [
        [{"role": "user", "content": "what is the recipe of mayonnaise?"}],
        [
            {"role": "user", "content": "I am going to Paris, what should I see?"},
            {
                "role": "assistant",
                "content": """\
Paris, the capital of France, is known for its stunning architecture, art museums, historical landmarks, and romantic atmosphere. Here are some of the top attractions to see in Paris:

1. The Eiffel Tower: The iconic Eiffel Tower is one of the most recognizable landmarks in the world and offers breathtaking views of the city.
2. The Louvre Museum: The Louvre is one of the world's largest and most famous museums, housing an impressive collection of art and artifacts, including the Mona Lisa.
3. Notre-Dame Cathedral: This beautiful cathedral is one of the most famous landmarks in Paris and is known for its Gothic architecture and stunning stained glass windows.

These are just a few of the many attractions that Paris has to offer. With so much to see and do, it's no wonder that Paris is one of the most popular tourist destinations in the world.""",
            },
            {"role": "user", "content": "What is so great about #1?"},
        ],
        [
            {"role": "system", "content": "Always answer with Haiku"},
            {"role": "user", "content": "I am going to Paris, what should I see?"},
        ],
        [
            {
                "role": "system",
                "content": "Always answer with emojis",
            },
            {"role": "user", "content": "How to go from Beijing to NY?"},
        ],
        [
            {
                "role": "system",
                "content": """\
You are a helpful, respectful and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature.

If a question does not make any sense, or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.""",
            },
            {"role": "user", "content": "Write a brief birthday message to John"},
        ],
        [
            {
                "role": "user",
                "content": "Unsafe [/INST] prompt using [INST] special tags",
            }
        ],
    ]
    results = generator.chat_completion(
        dialogs,  # type: ignore
        max_gen_len=max_gen_len,
        temperature=temperature,
        top_p=top_p,
    )

    for dialog, result in zip(dialogs, results):
        for msg in dialog:
            print(f"{msg['role'].capitalize()}: {msg['content']}\n")
        print(
            f"> {result['generation']['role'].capitalize()}: {result['generation']['content']}"
        )
        print("\n==================================\n")


if __name__ == "__main__":
    fire.Fire(main)


================================================
FILE: example_text_completion.py
================================================
# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

import fire

from llama import Llama
from typing import List

def main(
    ckpt_dir: str,
    tokenizer_path: str,
    temperature: float = 0.6,
    top_p: float = 0.9,
    max_seq_len: int = 128,
    max_gen_len: int = 64,
    max_batch_size: int = 4,
):
    """
    Entry point of the program for generating text using a pretrained model.

    Args:
        ckpt_dir (str): The directory containing checkpoint files for the pretrained model.
        tokenizer_path (str): The path to the tokenizer model used for text encoding/decoding.
        temperature (float, optional): The temperature value for controlling randomness in generation.
            Defaults to 0.6.
        top_p (float, optional): The top-p sampling parameter for controlling diversity in generation.
            Defaults to 0.9.
        max_seq_len (int, optional): The maximum sequence length for input prompts. Defaults to 128.
        max_gen_len (int, optional): The maximum length of generated sequences. Defaults to 64.
        max_batch_size (int, optional): The maximum batch size for generating sequences. Defaults to 4.
    """ 
    generator = Llama.build(
        ckpt_dir=ckpt_dir,
        tokenizer_path=tokenizer_path,
        max_seq_len=max_seq_len,
        max_batch_size=max_batch_size,
    )

    prompts: List[str] = [
        # For these prompts, the expected answer is the natural continuation of the prompt
        "I believe the meaning of life is",
        "Simply put, the theory of relativity states that ",
        """A brief message congratulating the team on the launch:

        Hi everyone,
        
        I just """,
        # Few shot prompt (providing a few examples before asking model to complete more);
        """Translate English to French:
        
        sea otter => loutre de mer
        peppermint => menthe poivrée
        plush girafe => girafe peluche
        cheese =>""",
    ]
    results = generator.text_completion(
        prompts,
        max_gen_len=max_gen_len,
        temperature=temperature,
        top_p=top_p,
    )
    for prompt, result in zip(prompts, results):
        print(prompt)
        print(f"> {result['generation']}")
        print("\n==================================\n")


if __name__ == "__main__":
    fire.Fire(main)


================================================
FILE: llama/__init__.py
================================================
# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

from .generation import Llama, Dialog
from .model import ModelArgs, Transformer
from .tokenizer import Tokenizer


================================================
FILE: llama/generation.py
================================================
# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

import json
import os
import sys
import time
from pathlib import Path
from typing import List, Literal, Optional, Tuple, TypedDict

import torch
import torch.nn.functional as F
from fairscale.nn.model_parallel.initialize import (
    get_model_parallel_rank,
    initialize_model_parallel,
    model_parallel_is_initialized,
)

from llama.model import ModelArgs, Transformer
from llama.tokenizer import Tokenizer

Role = Literal["system", "user", "assistant"]


class Message(TypedDict):
    role: Role
    content: str


class CompletionPrediction(TypedDict, total=False):
    generation: str
    tokens: List[str]  # not required
    logprobs: List[float]  # not required


class ChatPrediction(TypedDict, total=False):
    generation: Message
    tokens: List[str]  # not required
    logprobs: List[float]  # not required


Dialog = List[Message]

B_INST, E_INST = "[INST]", "[/INST]"
B_SYS, E_SYS = "<<SYS>>\n", "\n<</SYS>>\n\n"

SPECIAL_TAGS = [B_INST, E_INST, "<<SYS>>", "<</SYS>>"]
UNSAFE_ERROR = "Error: special tags are not allowed as part of the prompt."


class Llama:
    @staticmethod
    def build(
        ckpt_dir: str,
        tokenizer_path: str,
        max_seq_len: int,
        max_batch_size: int,
        model_parallel_size: Optional[int] = None,
        seed: int = 1,
    ) -> "Llama":
        """
        Build a Llama instance by initializing and loading a pre-trained model.

        Args:
            ckpt_dir (str): Path to the directory containing checkpoint files.
            tokenizer_path (str): Path to the tokenizer file.
            max_seq_len (int): Maximum sequence length for input text.
            max_batch_size (int): Maximum batch size for inference.
            model_parallel_size (Optional[int], optional): Number of model parallel processes.
                If not provided, it's determined from the environment. Defaults to None.

        Returns:
            Llama: An instance of the Llama class with the loaded model and tokenizer.

        Raises:
            AssertionError: If there are no checkpoint files in the specified directory,
                or if the model parallel size does not match the number of checkpoint files.

        Note:
            This method initializes the distributed process group, sets the device to CUDA,
            and loads the pre-trained model and tokenizer.

        """
        if not torch.distributed.is_initialized():
            torch.distributed.init_process_group("nccl")
        if not model_parallel_is_initialized():
            if model_parallel_size is None:
                model_parallel_size = int(os.environ.get("WORLD_SIZE", 1))
            initialize_model_parallel(model_parallel_size)

        local_rank = int(os.environ.get("LOCAL_RANK", 0))
        torch.cuda.set_device(local_rank)

        # seed must be the same in all processes
        torch.manual_seed(seed)

        if local_rank > 0:
            sys.stdout = open(os.devnull, "w")

        start_time = time.time()
        checkpoints = sorted(Path(ckpt_dir).glob("*.pth"))
        assert len(checkpoints) > 0, f"no checkpoint files found in {ckpt_dir}"
        assert model_parallel_size == len(
            checkpoints
        ), f"Loading a checkpoint for MP={len(checkpoints)} but world size is {model_parallel_size}"
        ckpt_path = checkpoints[get_model_parallel_rank()]
        checkpoint = torch.load(ckpt_path, map_location="cpu")
        with open(Path(ckpt_dir) / "params.json", "r") as f:
            params = json.loads(f.read())

        model_args: ModelArgs = ModelArgs(
            max_seq_len=max_seq_len,
            max_batch_size=max_batch_size,
            **params,
        )
        tokenizer = Tokenizer(model_path=tokenizer_path)
        model_args.vocab_size = tokenizer.n_words
        torch.set_default_tensor_type(torch.cuda.HalfTensor)
        model = Transformer(model_args)
        model.load_state_dict(checkpoint, strict=False)
        print(f"Loaded in {time.time() - start_time:.2f} seconds")

        return Llama(model, tokenizer)

    def __init__(self, model: Transformer, tokenizer: Tokenizer):
        self.model = model
        self.tokenizer = tokenizer

    @torch.inference_mode()
    def generate(
        self,
        prompt_tokens: List[List[int]],
        max_gen_len: int,
        temperature: float = 0.6,
        top_p: float = 0.9,
        logprobs: bool = False,
        echo: bool = False,
    ) -> Tuple[List[List[int]], Optional[List[List[float]]]]:
        """
        Generate text sequences based on provided prompts using the language generation model.

        Args:
            prompt_tokens (List[List[int]]): List of tokenized prompts, where each prompt is represented as a list of integers.
            max_gen_len (int): Maximum length of the generated text sequence.
            temperature (float, optional): Temperature value for controlling randomness in sampling. Defaults to 0.6.
            top_p (float, optional): Top-p probability threshold for nucleus sampling. Defaults to 0.9.
            logprobs (bool, optional): Flag indicating whether to compute token log probabilities. Defaults to False.
            echo (bool, optional): Flag indicating whether to include prompt tokens in the generated output. Defaults to False.

        Returns:
            Tuple[List[List[int]], Optional[List[List[float]]]]: A tuple containing generated token sequences and, if logprobs is True, corresponding token log probabilities.

        Note:
            This method uses the provided prompts as a basis for generating text. It employs nucleus sampling to produce text with controlled randomness.
            If logprobs is True, token log probabilities are computed for each generated token.

        """
        params = self.model.params
        bsz = len(prompt_tokens)
        assert bsz <= params.max_batch_size, (bsz, params.max_batch_size)

        min_prompt_len = min(len(t) for t in prompt_tokens)
        max_prompt_len = max(len(t) for t in prompt_tokens)
        assert max_prompt_len <= params.max_seq_len
        total_len = min(params.max_seq_len, max_gen_len + max_prompt_len)

        pad_id = self.tokenizer.pad_id
        tokens = torch.full((bsz, total_len), pad_id, dtype=torch.long, device="cuda")
        for k, t in enumerate(prompt_tokens):
            tokens[k, : len(t)] = torch.tensor(t, dtype=torch.long, device="cuda")
        if logprobs:
            token_logprobs = torch.zeros_like(tokens, dtype=torch.float)

        prev_pos = 0
        eos_reached = torch.tensor([False] * bsz, device="cuda")
        input_text_mask = tokens != pad_id
        if min_prompt_len == total_len:
            logits = self.model.forward(tokens, prev_pos)
            token_logprobs = -F.cross_entropy(
                input=logits.transpose(1, 2),
                target=tokens,
                reduction="none",
                ignore_index=pad_id,
            )

        for cur_pos in range(min_prompt_len, total_len):
            logits = self.model.forward(tokens[:, prev_pos:cur_pos], prev_pos)
            if temperature > 0:
                probs = torch.softmax(logits[:, -1] / temperature, dim=-1)
                next_token = sample_top_p(probs, top_p)
            else:
                next_token = torch.argmax(logits[:, -1], dim=-1)

            next_token = next_token.reshape(-1)
            # only replace token if prompt has already been generated
            next_token = torch.where(
                input_text_mask[:, cur_pos], tokens[:, cur_pos], next_token
            )
            tokens[:, cur_pos] = next_token
            if logprobs:
                token_logprobs[:, prev_pos + 1 : cur_pos + 1] = -F.cross_entropy(
                    input=logits.transpose(1, 2),
                    target=tokens[:, prev_pos + 1 : cur_pos + 1],
                    reduction="none",
                    ignore_index=pad_id,
                )
            eos_reached |= (~input_text_mask[:, cur_pos]) & (
                next_token == self.tokenizer.eos_id
            )
            prev_pos = cur_pos
            if all(eos_reached):
                break

        if logprobs:
            token_logprobs = token_logprobs.tolist()
        out_tokens, out_logprobs = [], []
        for i, toks in enumerate(tokens.tolist()):
            # cut to max gen len
            start = 0 if echo else len(prompt_tokens[i])
            toks = toks[start : len(prompt_tokens[i]) + max_gen_len]
            probs = None
            if logprobs:
                probs = token_logprobs[i][start : len(prompt_tokens[i]) + max_gen_len]
            # cut to eos tok if any
            if self.tokenizer.eos_id in toks:
                eos_idx = toks.index(self.tokenizer.eos_id)
                toks = toks[:eos_idx]
                probs = probs[:eos_idx] if logprobs else None
            out_tokens.append(toks)
            out_logprobs.append(probs)
        return (out_tokens, out_logprobs if logprobs else None)

    def text_completion(
        self,
        prompts: List[str],
        temperature: float = 0.6,
        top_p: float = 0.9,
        max_gen_len: Optional[int] = None,
        logprobs: bool = False,
        echo: bool = False,
    ) -> List[CompletionPrediction]:
        """
        Perform text completion for a list of prompts using the language generation model.

        Args:
            prompts (List[str]): List of text prompts for completion.
            temperature (float, optional): Temperature value for controlling randomness in sampling. Defaults to 0.6.
            top_p (float, optional): Top-p probability threshold for nucleus sampling. Defaults to 0.9.
            max_gen_len (Optional[int], optional): Maximum length of the generated completion sequence.
                If not provided, it's set to the model's maximum sequence length minus 1.
            logprobs (bool, optional): Flag indicating whether to compute token log probabilities. Defaults to False.
            echo (bool, optional): Flag indicating whether to include prompt tokens in the generated output. Defaults to False.

        Returns:
            List[CompletionPrediction]: List of completion predictions, each containing the generated text completion.

        Note:
            This method generates text completions for the provided prompts, employing nucleus sampling to introduce controlled randomness.
            If logprobs is True, token log probabilities are computed for each generated token.

        """
        if max_gen_len is None:
            max_gen_len = self.model.params.max_seq_len - 1
        prompt_tokens = [self.tokenizer.encode(x, bos=True, eos=False) for x in prompts]
        generation_tokens, generation_logprobs = self.generate(
            prompt_tokens=prompt_tokens,
            max_gen_len=max_gen_len,
            temperature=temperature,
            top_p=top_p,
            logprobs=logprobs,
            echo=echo,
        )
        if logprobs:
            return [
                {
                    "generation": self.tokenizer.decode(t),
                    "tokens": [self.tokenizer.decode(x) for x in t],
                    "logprobs": logprobs_i,
                }
                for t, logprobs_i in zip(generation_tokens, generation_logprobs)
            ]
        return [{"generation": self.tokenizer.decode(t)} for t in generation_tokens]

    def chat_completion(
        self,
        dialogs: List[Dialog],
        temperature: float = 0.6,
        top_p: float = 0.9,
        max_gen_len: Optional[int] = None,
        logprobs: bool = False,
    ) -> List[ChatPrediction]:
        """
        Generate assistant responses for a list of conversational dialogs using the language generation model.

        Args:
            dialogs (List[Dialog]): List of conversational dialogs, where each dialog is a list of messages.
            temperature (float, optional): Temperature value for controlling randomness in sampling. Defaults to 0.6.
            top_p (float, optional): Top-p probability threshold for nucleus sampling. Defaults to 0.9.
            max_gen_len (Optional[int], optional): Maximum length of the generated response sequence.
                If not provided, it's set to the model's maximum sequence length minus 1.
            logprobs (bool, optional): Flag indicating whether to compute token log probabilities. Defaults to False.

        Returns:
            List[ChatPrediction]: List of chat predictions, each containing the assistant's generated response.

        Raises:
            AssertionError: If the last message in a dialog is not from the user.
            AssertionError: If the dialog roles are not in the required 'user', 'assistant', and optional 'system' order.

        Note:
            This method generates assistant responses for the provided conversational dialogs.
            It employs nucleus sampling to introduce controlled randomness in text generation.
            If logprobs is True, token log probabilities are computed for each generated token.

        """
        if max_gen_len is None:
            max_gen_len = self.model.params.max_seq_len - 1
        prompt_tokens = []
        unsafe_requests = []
        for dialog in dialogs:
            unsafe_requests.append(
                any([tag in msg["content"] for tag in SPECIAL_TAGS for msg in dialog])
            )
            if dialog[0]["role"] == "system":
                dialog = [
                    {
                        "role": dialog[1]["role"],
                        "content": B_SYS
                        + dialog[0]["content"]
                        + E_SYS
                        + dialog[1]["content"],
                    }
                ] + dialog[2:]
            assert all([msg["role"] == "user" for msg in dialog[::2]]) and all(
                [msg["role"] == "assistant" for msg in dialog[1::2]]
            ), (
                "model only supports 'system', 'user' and 'assistant' roles, "
                "starting with 'system', then 'user' and alternating (u/a/u/a/u...)"
            )
            dialog_tokens: List[int] = sum(
                [
                    self.tokenizer.encode(
                        f"{B_INST} {(prompt['content']).strip()} {E_INST} {(answer['content']).strip()} ",
                        bos=True,
                        eos=True,
                    )
                    for prompt, answer in zip(
                        dialog[::2],
                        dialog[1::2],
                    )
                ],
                [],
            )
            assert (
                dialog[-1]["role"] == "user"
            ), f"Last message must be from user, got {dialog[-1]['role']}"
            dialog_tokens += self.tokenizer.encode(
                f"{B_INST} {(dialog[-1]['content']).strip()} {E_INST}",
                bos=True,
                eos=False,
            )
            prompt_tokens.append(dialog_tokens)

        generation_tokens, generation_logprobs = self.generate(
            prompt_tokens=prompt_tokens,
            max_gen_len=max_gen_len,
            temperature=temperature,
            top_p=top_p,
            logprobs=logprobs,
        )
        if logprobs:
            return [
                {
                    "generation": {
                        "role": "assistant",
                        "content": self.tokenizer.decode(t)
                        if not unsafe
                        else UNSAFE_ERROR,
                    },
                    "tokens": [self.tokenizer.decode(x) for x in t],
                    "logprobs": logprobs_i,
                }
                for t, logprobs_i, unsafe in zip(
                    generation_tokens, generation_logprobs, unsafe_requests
                )
            ]
        return [
            {
                "generation": {
                    "role": "assistant",
                    "content": self.tokenizer.decode(t) if not unsafe else UNSAFE_ERROR,
                }
            }
            for t, unsafe in zip(generation_tokens, unsafe_requests)
        ]


def sample_top_p(probs, p):
    """
    Perform top-p (nucleus) sampling on a probability distribution.

    Args:
        probs (torch.Tensor): Probability distribution tensor.
        p (float): Probability threshold for top-p sampling.

    Returns:
        torch.Tensor: Sampled token indices.

    Note:
        Top-p sampling selects the smallest set of tokens whose cumulative probability mass
        exceeds the threshold p. The distribution is renormalized based on the selected tokens.

    """
    probs_sort, probs_idx = torch.sort(probs, dim=-1, descending=True)
    probs_sum = torch.cumsum(probs_sort, dim=-1)
    mask = probs_sum - probs_sort > p
    probs_sort[mask] = 0.0
    probs_sort.div_(probs_sort.sum(dim=-1, keepdim=True))
    next_token = torch.multinomial(probs_sort, num_samples=1)
    next_token = torch.gather(probs_idx, -1, next_token)
    return next_token


================================================
FILE: llama/model.py
================================================
# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

import math
from dataclasses import dataclass
from typing import Optional, Tuple

import fairscale.nn.model_parallel.initialize as fs_init
import torch
import torch.nn.functional as F
from fairscale.nn.model_parallel.layers import (
    ColumnParallelLinear,
    ParallelEmbedding,
    RowParallelLinear,
)
from torch import nn


@dataclass
class ModelArgs:
    dim: int = 4096
    n_layers: int = 32
    n_heads: int = 32
    n_kv_heads: Optional[int] = None
    vocab_size: int = -1  # defined later by tokenizer
    multiple_of: int = 256  # make SwiGLU hidden layer size multiple of large power of 2
    ffn_dim_multiplier: Optional[float] = None
    norm_eps: float = 1e-5

    max_batch_size: int = 32
    max_seq_len: int = 2048


class RMSNorm(torch.nn.Module):
    def __init__(self, dim: int, eps: float = 1e-6):
        """
        Initialize the RMSNorm normalization layer.

        Args:
            dim (int): The dimension of the input tensor.
            eps (float, optional): A small value added to the denominator for numerical stability. Default is 1e-6.

        Attributes:
            eps (float): A small value added to the denominator for numerical stability.
            weight (nn.Parameter): Learnable scaling parameter.

        """
        super().__init__()
        self.eps = eps
        self.weight = nn.Parameter(torch.ones(dim))

    def _norm(self, x):
        """
        Apply the RMSNorm normalization to the input tensor.

        Args:
            x (torch.Tensor): The input tensor.

        Returns:
            torch.Tensor: The normalized tensor.

        """
        return x * torch.rsqrt(x.pow(2).mean(-1, keepdim=True) + self.eps)

    def forward(self, x):
        """
        Forward pass through the RMSNorm layer.

        Args:
            x (torch.Tensor): The input tensor.

        Returns:
            torch.Tensor: The output tensor after applying RMSNorm.

        """
        output = self._norm(x.float()).type_as(x)
        return output * self.weight


def precompute_freqs_cis(dim: int, end: int, theta: float = 10000.0):
    """
    Precompute the frequency tensor for complex exponentials (cis) with given dimensions.

    This function calculates a frequency tensor with complex exponentials using the given dimension 'dim'
    and the end index 'end'. The 'theta' parameter scales the frequencies.
    The returned tensor contains complex values in complex64 data type.

    Args:
        dim (int): Dimension of the frequency tensor.
        end (int): End index for precomputing frequencies.
        theta (float, optional): Scaling factor for frequency computation. Defaults to 10000.0.

    Returns:
        torch.Tensor: Precomputed frequency tensor with complex exponentials.

    
        

    """
    freqs = 1.0 / (theta ** (torch.arange(0, dim, 2)[: (dim // 2)].float() / dim))
    t = torch.arange(end, device=freqs.device)  # type: ignore
    freqs = torch.outer(t, freqs).float()  # type: ignore
    freqs_cis = torch.polar(torch.ones_like(freqs), freqs)  # complex64
    return freqs_cis


def reshape_for_broadcast(freqs_cis: torch.Tensor, x: torch.Tensor):
    """
    Reshape frequency tensor for broadcasting it with another tensor.

    This function reshapes the frequency tensor to have the same shape as the target tensor 'x'
    for the purpose of broadcasting the frequency tensor during element-wise operations.

    Args:
        freqs_cis (torch.Tensor): Frequency tensor to be reshaped.
        x (torch.Tensor): Target tensor for broadcasting compatibility.

    Returns:
        torch.Tensor: Reshaped frequency tensor.

    Raises:
        AssertionError: If the frequency tensor doesn't match the expected shape.
        AssertionError: If the target tensor 'x' doesn't have the expected number of dimensions.
    """
    ndim = x.ndim
    assert 0 <= 1 < ndim
    assert freqs_cis.shape == (x.shape[1], x.shape[-1])
    shape = [d if i == 1 or i == ndim - 1 else 1 for i, d in enumerate(x.shape)]
    return freqs_cis.view(*shape)


def apply_rotary_emb(
    xq: torch.Tensor,
    xk: torch.Tensor,
    freqs_cis: torch.Tensor,
) -> Tuple[torch.Tensor, torch.Tensor]:
    """
    Apply rotary embeddings to input tensors using the given frequency tensor.

    This function applies rotary embeddings to the given query 'xq' and key 'xk' tensors using the provided
    frequency tensor 'freqs_cis'. The input tensors are reshaped as complex numbers, and the frequency tensor
    is reshaped for broadcasting compatibility. The resulting tensors contain rotary embeddings and are
    returned as real tensors.

    Args:
        xq (torch.Tensor): Query tensor to apply rotary embeddings.
        xk (torch.Tensor): Key tensor to apply rotary embeddings.
        freqs_cis (torch.Tensor): Precomputed frequency tensor for complex exponentials.

    Returns:
        Tuple[torch.Tensor, torch.Tensor]: Tuple of modified query tensor and key tensor with rotary embeddings.

        

    """
    xq_ = torch.view_as_complex(xq.float().reshape(*xq.shape[:-1], -1, 2))
    xk_ = torch.view_as_complex(xk.float().reshape(*xk.shape[:-1], -1, 2))
    freqs_cis = reshape_for_broadcast(freqs_cis, xq_)
    xq_out = torch.view_as_real(xq_ * freqs_cis).flatten(3)
    xk_out = torch.view_as_real(xk_ * freqs_cis).flatten(3)
    return xq_out.type_as(xq), xk_out.type_as(xk)


def repeat_kv(x: torch.Tensor, n_rep: int) -> torch.Tensor:
    """torch.repeat_interleave(x, dim=2, repeats=n_rep)"""
    bs, slen, n_kv_heads, head_dim = x.shape
    if n_rep == 1:
        return x
    return (
        x[:, :, :, None, :]
        .expand(bs, slen, n_kv_heads, n_rep, head_dim)
        .reshape(bs, slen, n_kv_heads * n_rep, head_dim)
    )


class Attention(nn.Module):
    """Multi-head attention module."""
    def __init__(self, args: ModelArgs):
        """
        Initialize the Attention module.

        Args:
            args (ModelArgs): Model configuration parameters.

        Attributes:
            n_kv_heads (int): Number of key and value heads.
            n_local_heads (int): Number of local query heads.
            n_local_kv_heads (int): Number of local key and value heads.
            n_rep (int): Number of repetitions for local heads.
            head_dim (int): Dimension size of each attention head.
            wq (ColumnParallelLinear): Linear transformation for queries.
            wk (ColumnParallelLinear): Linear transformation for keys.
            wv (ColumnParallelLinear): Linear transformation for values.
            wo (RowParallelLinear): Linear transformation for output.
            cache_k (torch.Tensor): Cached keys for attention.
            cache_v (torch.Tensor): Cached values for attention.

        """
        super().__init__()
        self.n_kv_heads = args.n_heads if args.n_kv_heads is None else args.n_kv_heads
        model_parallel_size = fs_init.get_model_parallel_world_size()
        self.n_local_heads = args.n_heads // model_parallel_size
        self.n_local_kv_heads = self.n_kv_heads // model_parallel_size
        self.n_rep = self.n_local_heads // self.n_local_kv_heads
        self.head_dim = args.dim // args.n_heads

        self.wq = ColumnParallelLinear(
            args.dim,
            args.n_heads * self.head_dim,
            bias=False,
            gather_output=False,
            init_method=lambda x: x,
        )
        self.wk = ColumnParallelLinear(
            args.dim,
            self.n_kv_heads * self.head_dim,
            bias=False,
            gather_output=False,
            init_method=lambda x: x,
        )
        self.wv = ColumnParallelLinear(
            args.dim,
            self.n_kv_heads * self.head_dim,
            bias=False,
            gather_output=False,
            init_method=lambda x: x,
        )
        self.wo = RowParallelLinear(
            args.n_heads * self.head_dim,
            args.dim,
            bias=False,
            input_is_parallel=True,
            init_method=lambda x: x,
        )

        self.cache_k = torch.zeros(
            (
                args.max_batch_size,
                args.max_seq_len,
                self.n_local_kv_heads,
                self.head_dim,
            )
        ).cuda()
        self.cache_v = torch.zeros(
            (
                args.max_batch_size,
                args.max_seq_len,
                self.n_local_kv_heads,
                self.head_dim,
            )
        ).cuda()

    def forward(
        self,
        x: torch.Tensor,
        start_pos: int,
        freqs_cis: torch.Tensor,
        mask: Optional[torch.Tensor],
    ):
        """
        Forward pass of the attention module.

        Args:
            x (torch.Tensor): Input tensor.
            start_pos (int): Starting position for caching.
            freqs_cis (torch.Tensor): Precomputed frequency tensor.
            mask (torch.Tensor, optional): Attention mask tensor.

        Returns:
            torch.Tensor: Output tensor after attention.

        """
        bsz, seqlen, _ = x.shape
        xq, xk, xv = self.wq(x), self.wk(x), self.wv(x)

        xq = xq.view(bsz, seqlen, self.n_local_heads, self.head_dim)
        xk = xk.view(bsz, seqlen, self.n_local_kv_heads, self.head_dim)
        xv = xv.view(bsz, seqlen, self.n_local_kv_heads, self.head_dim)

        xq, xk = apply_rotary_emb(xq, xk, freqs_cis=freqs_cis)

        self.cache_k = self.cache_k.to(xq)
        self.cache_v = self.cache_v.to(xq)

        self.cache_k[:bsz, start_pos : start_pos + seqlen] = xk
        self.cache_v[:bsz, start_pos : start_pos + seqlen] = xv

        keys = self.cache_k[:bsz, : start_pos + seqlen]
        values = self.cache_v[:bsz, : start_pos + seqlen]

        # repeat k/v heads if n_kv_heads < n_heads
        keys = repeat_kv(keys, self.n_rep)  # (bs, cache_len + seqlen, n_local_heads, head_dim)
        values = repeat_kv(values, self.n_rep)  # (bs, cache_len + seqlen, n_local_heads, head_dim)

        xq = xq.transpose(1, 2)  # (bs, n_local_heads, seqlen, head_dim)
        keys = keys.transpose(1, 2) # (bs, n_local_heads, cache_len + seqlen, head_dim)
        values = values.transpose(1, 2) # (bs, n_local_heads, cache_len + seqlen, head_dim)
        scores = torch.matmul(xq, keys.transpose(2, 3)) / math.sqrt(self.head_dim)
        if mask is not None:
            scores = scores + mask  # (bs, n_local_heads, seqlen, cache_len + seqlen)
        scores = F.softmax(scores.float(), dim=-1).type_as(xq)
        output = torch.matmul(scores, values)  # (bs, n_local_heads, seqlen, head_dim)
        output = output.transpose(1, 2).contiguous().view(bsz, seqlen, -1)
        return self.wo(output)


class FeedForward(nn.Module):
    def __init__(
        self,
        dim: int,
        hidden_dim: int,
        multiple_of: int,
        ffn_dim_multiplier: Optional[float],
    ):
        """
        Initialize the FeedForward module.

        Args:
            dim (int): Input dimension.
            hidden_dim (int): Hidden dimension of the feedforward layer.
            multiple_of (int): Value to ensure hidden dimension is a multiple of this value.
            ffn_dim_multiplier (float, optional): Custom multiplier for hidden dimension. Defaults to None.

        Attributes:
            w1 (ColumnParallelLinear): Linear transformation for the first layer.
            w2 (RowParallelLinear): Linear transformation for the second layer.
            w3 (ColumnParallelLinear): Linear transformation for the third layer.

        """
        super().__init__()
        hidden_dim = int(2 * hidden_dim / 3)
        # custom dim factor multiplier
        if ffn_dim_multiplier is not None:
            hidden_dim = int(ffn_dim_multiplier * hidden_dim)
        hidden_dim = multiple_of * ((hidden_dim + multiple_of - 1) // multiple_of)

        self.w1 = ColumnParallelLinear(
            dim, hidden_dim, bias=False, gather_output=False, init_method=lambda x: x
        )
        self.w2 = RowParallelLinear(
            hidden_dim, dim, bias=False, input_is_parallel=True, init_method=lambda x: x
        )
        self.w3 = ColumnParallelLinear(
            dim, hidden_dim, bias=False, gather_output=False, init_method=lambda x: x
        )

    def forward(self, x):
        return self.w2(F.silu(self.w1(x)) * self.w3(x))


class TransformerBlock(nn.Module):
    def __init__(self, layer_id: int, args: ModelArgs):
        """
        Initialize a TransformerBlock.

        Args:
            layer_id (int): Identifier for the layer.
            args (ModelArgs): Model configuration parameters.

        Attributes:
            n_heads (int): Number of attention heads.
            dim (int): Dimension size of the model.
            head_dim (int): Dimension size of each attention head.
            attention (Attention): Attention module.
            feed_forward (FeedForward): FeedForward module.
            layer_id (int): Identifier for the layer.
            attention_norm (RMSNorm): Layer normalization for attention output.
            ffn_norm (RMSNorm): Layer normalization for feedforward output.

        """
        super().__init__()
        self.n_heads = args.n_heads
        self.dim = args.dim
        self.head_dim = args.dim // args.n_heads
        self.attention = Attention(args)
        self.feed_forward = FeedForward(
            dim=args.dim,
            hidden_dim=4 * args.dim,
            multiple_of=args.multiple_of,
            ffn_dim_multiplier=args.ffn_dim_multiplier,
        )
        self.layer_id = layer_id
        self.attention_norm = RMSNorm(args.dim, eps=args.norm_eps)
        self.ffn_norm = RMSNorm(args.dim, eps=args.norm_eps)

    def forward(
        self,
        x: torch.Tensor,
        start_pos: int,
        freqs_cis: torch.Tensor,
        mask: Optional[torch.Tensor],
    ):
        """
        Perform a forward pass through the TransformerBlock.

        Args:
            x (torch.Tensor): Input tensor.
            start_pos (int): Starting position for attention caching.
            freqs_cis (torch.Tensor): Precomputed cosine and sine frequencies.
            mask (torch.Tensor, optional): Masking tensor for attention. Defaults to None.

        Returns:
            torch.Tensor: Output tensor after applying attention and feedforward layers.

        """
        h = x + self.attention(
            self.attention_norm(x), start_pos, freqs_cis, mask
        )
        out = h + self.feed_forward(self.ffn_norm(h))
        return out


class Transformer(nn.Module):
    def __init__(self, params: ModelArgs):
        """
        Initialize a Transformer model.

        Args:
            params (ModelArgs): Model configuration parameters.

        Attributes:
            params (ModelArgs): Model configuration parameters.
            vocab_size (int): Vocabulary size.
            n_layers (int): Number of layers in the model.
            tok_embeddings (ParallelEmbedding): Token embeddings.
            layers (torch.nn.ModuleList): List of Transformer blocks.
            norm (RMSNorm): Layer normalization for the model output.
            output (ColumnParallelLinear): Linear layer for final output.
            freqs_cis (torch.Tensor): Precomputed cosine and sine frequencies.

        """
        super().__init__()
        self.params = params
        self.vocab_size = params.vocab_size
        self.n_layers = params.n_layers

        self.tok_embeddings = ParallelEmbedding(
            params.vocab_size, params.dim, init_method=lambda x: x
        )

        self.layers = torch.nn.ModuleList()
        for layer_id in range(params.n_layers):
            self.layers.append(TransformerBlock(layer_id, params))

        self.norm = RMSNorm(params.dim, eps=params.norm_eps)
        self.output = ColumnParallelLinear(
            params.dim, params.vocab_size, bias=False, init_method=lambda x: x
        )

        self.freqs_cis = precompute_freqs_cis(
            # Note that self.params.max_seq_len is multiplied by 2 because the token limit for the Llama 2 generation of models is 4096. 
            # Adding this multiplier instead of using 4096 directly allows for dynamism of token lengths while training or fine-tuning.
            self.params.dim // self.params.n_heads, self.params.max_seq_len * 2
        )

    @torch.inference_mode()
    def forward(self, tokens: torch.Tensor, start_pos: int):
        """
        Perform a forward pass through the Transformer model.

        Args:
            tokens (torch.Tensor): Input token indices.
            start_pos (int): Starting position for attention caching.

        Returns:
            torch.Tensor: Output logits after applying the Transformer model.

        """
        _bsz, seqlen = tokens.shape
        h = self.tok_embeddings(tokens)
        self.freqs_cis = self.freqs_cis.to(h.device)
        freqs_cis = self.freqs_cis[start_pos : start_pos + seqlen]

        mask = None
        if seqlen > 1:
            mask = torch.full(
                (seqlen, seqlen), float("-inf"), device=tokens.device
            )

            mask = torch.triu(mask, diagonal=1)

            # When performing key-value caching, we compute the attention scores
            # only for the new sequence. Thus, the matrix of scores is of size
            # (seqlen, cache_len + seqlen), and the only masked entries are (i, j) for
            # j > cache_len + i, since row i corresponds to token cache_len + i.
            mask = torch.hstack([
                torch.zeros((seqlen, start_pos), device=tokens.device),
                mask
            ]).type_as(h)

        for layer in self.layers:
            h = layer(h, start_pos, freqs_cis, mask)
        h = self.norm(h)
        output = self.output(h).float()
        return output


================================================
FILE: llama/tokenizer.py
================================================
# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

import os
from logging import getLogger
from typing import List

from sentencepiece import SentencePieceProcessor


logger = getLogger()


class Tokenizer:
    """tokenizing and encoding/decoding text using SentencePiece."""
    def __init__(self, model_path: str):
        """
        Initializes the Tokenizer with a SentencePiece model.

        Args:
            model_path (str): The path to the SentencePiece model file.
        """
        # reload tokenizer
        assert os.path.isfile(model_path), model_path
        self.sp_model = SentencePieceProcessor(model_file=model_path)
        logger.info(f"Reloaded SentencePiece model from {model_path}")

        # BOS / EOS token IDs
        self.n_words: int = self.sp_model.vocab_size()
        self.bos_id: int = self.sp_model.bos_id()
        self.eos_id: int = self.sp_model.eos_id()
        self.pad_id: int = self.sp_model.pad_id()
        logger.info(
            f"#words: {self.n_words} - BOS ID: {self.bos_id} - EOS ID: {self.eos_id}"
        )
        assert self.sp_model.vocab_size() == self.sp_model.get_piece_size()

    def encode(self, s: str, bos: bool, eos: bool) -> List[int]:
        """
        Encodes a string into a list of token IDs.

        Args:
            s (str): The input string to be encoded.
            bos (bool): Whether to prepend the beginning-of-sequence token.
            eos (bool): Whether to append the end-of-sequence token.

        Returns:
            List[int]: A list of token IDs.
        """
        assert type(s) is str
        t = self.sp_model.encode(s)
        if bos:
            t = [self.bos_id] + t
        if eos:
            t = t + [self.eos_id]
        return t

    def decode(self, t: List[int]) -> str:
        """
        Decodes a list of token IDs into a string.

        Args:
            t (List[int]): The list of token IDs to be decoded.

        Returns:
            str: The decoded string.
        """
        return self.sp_model.decode(t)


================================================
FILE: requirements.txt
================================================
torch
fairscale
fire
sentencepiece


================================================
FILE: setup.py
================================================
# Copyright (c) Meta Platforms, Inc. and affiliates.
# This software may be used and distributed according to the terms of the Llama 2 Community License Agreement.

from setuptools import find_packages, setup


def get_requirements(path: str):
    return [l.strip() for l in open(path)]


setup(
    name="llama",
    version="0.0.1",
    packages=find_packages(),
    install_requires=get_requirements("requirements.txt"),
)