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# TRL - Transformer Reinforcement Learning
TRL is a full stack library where we provide a set of tools to train transformer language models with Reinforcement Learning, from the Supervised Fine-tuning step (SFT), Reward Modeling step (RM) to the Proximal Policy Optimization (PPO) step.
The library is integrated with 🤗 [transformers](https://github.com/huggingface/transformers).
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Check the appropriate sections of the documentation depending on your needs:
## API documentation
- [Model Classes](models): *A brief overview of what each public model class does.*
- [`SFTTrainer`](sft_trainer): *Supervise Fine-tune your model easily with `SFTTrainer`*
- [`RewardTrainer`](reward_trainer): *Train easily your reward model using `RewardTrainer`.*
- [`PPOTrainer`](ppo_trainer): *Further fine-tune the supervised fine-tuned model using PPO algorithm*
- [Best-of-N Sampling](best-of-n): *Use best of n sampling as an alternative way to sample predictions from your active model*
- [`DPOTrainer`](dpo_trainer): *Direct Preference Optimization training using `DPOTrainer`.*
- [`TextEnvironment`](text_environments): *Text environment to train your model using tools with RL.*
## Examples
- [Sentiment Tuning](sentiment_tuning): *Fine tune your model to generate positive movie contents*
- [Training with PEFT](lora_tuning_peft): *Memory efficient RLHF training using adapters with PEFT*
- [Detoxifying LLMs](detoxifying_a_lm): *Detoxify your language model through RLHF*
- [StackLlama](using_llama_models): *End-to-end RLHF training of a Llama model on Stack exchange dataset*
- [Learning with Tools](learning_tools): *Walkthrough of using `TextEnvironments`*
- [Multi-Adapter Training](multi_adapter_rl): *Use a single base model and multiple adapters for memory efficient end-to-end training*
## Blog posts
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<a class="!no-underline border dark:border-gray-700 p-5 rounded-lg shadow hover:shadow-lg" href="https://huggingface.co/blog/dpo_vlm">
<img src="https://raw.githubusercontent.com/huggingface/blog/main/assets/dpo_vlm/thumbnail.png" alt="thumbnail">
<p class="text-gray-700">Preference Optimization for Vision Language Models with TRL</p>
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<a class="!no-underline border dark:border-gray-700 p-5 rounded-lg shadow hover:shadow-lg" href="https://huggingface.co/blog/rlhf">
<img src="https://raw.githubusercontent.com/huggingface/blog/main/assets/120_rlhf/thumbnail.png" alt="thumbnail">
<p class="text-gray-700">Illustrating Reinforcement Learning from Human Feedback</p>
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<a class="!no-underline border dark:border-gray-700 p-5 rounded-lg shadow hover:shadow-lg" href="https://huggingface.co/blog/trl-peft">
<img src="https://github.com/huggingface/blog/blob/main/assets/133_trl_peft/thumbnail.png?raw=true" alt="thumbnail">
<p class="text-gray-700">Fine-tuning 20B LLMs with RLHF on a 24GB consumer GPU</p>
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<a class="!no-underline border dark:border-gray-700 p-5 rounded-lg shadow hover:shadow-lg" href="https://huggingface.co/blog/stackllama">
<img src="https://github.com/huggingface/blog/blob/main/assets/138_stackllama/thumbnail.png?raw=true" alt="thumbnail">
<p class="text-gray-700">StackLLaMA: A hands-on guide to train LLaMA with RLHF</p>
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<a class="!no-underline border dark:border-gray-700 p-5 rounded-lg shadow hover:shadow-lg" href="https://huggingface.co/blog/dpo-trl">
<img src="https://github.com/huggingface/blog/blob/main/assets/157_dpo_trl/dpo_thumbnail.png?raw=true" alt="thumbnail">
<p class="text-gray-700">Fine-tune Llama 2 with DPO</p>
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<a class="!no-underline border dark:border-gray-700 p-5 rounded-lg shadow hover:shadow-lg" href="https://huggingface.co/blog/trl-ddpo">
<img src="https://github.com/huggingface/blog/blob/main/assets/166_trl_ddpo/thumbnail.png?raw=true" alt="thumbnail">
<p class="text-gray-700">Finetune Stable Diffusion Models with DDPO via TRL</p>
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