Transformer Reinforcement Learning X

trlX is a distributed training framework designed from the ground up to focus on fine-tuning large language models with reinforcement learning using either a provided reward function or a reward-labeled dataset.

Training support for 🤗 Hugging Face models is provided by Accelerate -backed trainers, allowing users to fine-tune causal and T5-based language models of up to 20B parameters, such as facebook/opt-6.7b , EleutherAI/gpt-neox-20b , and google/flan-t5-xxl . For models beyond 20B parameters, trlX provides NVIDIA NeMo -backed trainers that leverage efficient parallelism techniques to scale effectively.

The following RL algorithms are currently implemented:

📖 Documentation

🧀 CHEESE Collect human annotations for your RL application with our human-in-the-loop data collection library.

git clone https://github.com/CarperAI/trlx.git
cd trlx
pip install torch --extra-index-url https://download.pytorch.org/whl/cu118
pip install -e .

For more usage see examples . You can also try the colab notebooks below:

Latest runs of the examples are on our Weights & Biases

You can train a model using a reward function or a reward-labeled dataset.

trainer = trlx.train('gpt2', reward_fn=lambda samples, **kwargs: [sample.count('cats') for sample in samples])

For reward model training refer to our autocrit library.

trainer = trlx.train('EleutherAI/gpt-j-6B', samples=['dolphins', 'geese'], rewards=[1.0, 100.0])

trainer = trlx.train('gpt2', samples=[['Question: 1 + 2 Answer:', '3'], ['Question: Solve this equation: ∀n>0, s=2, sum(n ** -s). Answer:', '(pi ** 2)/ 6']])

trainer.generate(**tokenizer('Q: Who rules the world? A:', return_tensors='pt'), do_sample=True)

from trlx.data.default_configs import default_ppo_config
config = default_ppo_config()
config.model.model_path = 'EleutherAI/gpt-neox-20b'
config.tokenizer.tokenizer_path = 'EleutherAI/gpt-neox-20b'
config.train.seq_length = 2048
trainer = trlx.train(config=config, reward_fn=lambda samples, **kwargs: [len(sample) for sample in samples])

To reduce memory usage (if you're experiencing CUDA Out of Memory errors), first try the lowest setting for the following hyperparameters and eventually increase them:

# micro batch size per gpu
config.train.batch_size = 1
# freeze all transformer layers
config.model.num_layers_unfrozen = 0
# maximum sample length, prompts or samples longer than that will be truncated
config.train.seq_length = 128
# micro batch size for sampling (specific for PPO)
config.method.chunk_size = 1
# use an additional Q-head (specific for ILQL)
config.method.two_qs = False

trainer.save_pretrained('/path/to/output/folder/')

accelerate config # choose DeepSpeed option
accelerate launch examples/simulacra.py

Follow the setup instructions in the NeMo README .

python examples/nemo_ilql_sentiments.py

For more usage see the NeMo README

ray start --head --port=6379
python -m trlx.sweep --config configs/sweeps/ppo_sweep.yml --accelerate_config configs/accelerate/ddp.yaml --num_gpus 4 examples/ppo_sentiments.py

python -m trlx.reference octocat/trlx-fork:fix-branch

trlX uses the standard Python logging library to log training information to the console. The default logger is set to the INFO level, which means that INFO , WARNING , ERROR , and CRITICAL level messages will be printed to standard output.

To change the log level directly, you can use the verbosity setter. For example, to set the log level to WARNING use:

import trlx
trlx.logging.set_verbosity(trlx.logging.WARNING)

This will suppress INFO level messages, but still print WARNING , ERROR , and CRITICAL level messages.

You can also control logging verbosity by setting the TRLX_VERBOSITY environment variable to one of the standard logging level names :

export TRLX_VERBOSITY=WARNING

By default, tqdm progress bars are used to display training progress. You can disable them by calling trlx.logging.disable_progress_bar() , otherwise trlx.logging.enable_progress_bar() to enable.

Messages can be formatted with greater detail by setting trlx.logging.enable_explicit_format() . This will inject call-site information into each log which may be helpful for debugging.

[2023-01-01 05:00:00,000] [INFO] [ppo_orchestrator.py:63:make_experience] [RANK 0] Message...

💡 Tip: To reduce the amount of logging output, you might find it helpful to change log levels of third-party libraries used by trlX. For example, try adding transformers.logging.set_verbosity_error() to the top of your trlX scripts to silence verbose messages from the transformers library (see their logging docs for more details).

For development check out these guidelines and also read our docs

@inproceedings{havrilla-etal-2023-trlx,
    title = "trl{X}: A Framework for Large Scale Reinforcement Learning from Human Feedback",
    author = "Havrilla, Alexander  and
      Zhuravinskyi, Maksym  and
      Phung, Duy  and
      Tiwari, Aman  and
      Tow, Jonathan  and
      Biderman, Stella  and
      Anthony, Quentin  and
      Castricato, Louis",
    booktitle = "Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing",
    month = dec,
    year = "2023",
    address = "Singapore",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2023.emnlp-main.530",
    doi = "10.18653/v1/2023.emnlp-main.530",
    pages = "8578--8595",
Acknowledgements

Many thanks to Leandro von Werra for contributing with trl, a library that initially inspired this repo.
        A repo for distributed training of language models with Reinforcement Learning via Human Feedback (RLHF)
    
Topics
  machine-learning
  reinforcement-learning
  pytorch