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OSRL (Offline Safe Reinforcement Learning) offers a collection of elegant and extensible implementations of state-of-the-art offline safe reinforcement learning (RL) algorithms. Aimed at propelling research in offline safe RL, OSRL serves as a solid foundation to implement, benchmark, and iterate on safe RL solutions. This repository is heavily inspired by the CORL library for offline RL, check them out too!

The OSRL package is a crucial component of our larger benchmarking suite for offline safe learning, which also includes DSRL and FSRL, and is built to facilitate the development of robust and reliable offline safe RL solutions.

To learn more, please visit our project website. If you find this code useful, please cite our paper, which has been accepted by the DMLR journal:

@article{
  liu2024offlinesaferl,
  title={Datasets and Benchmarks for Offline Safe Reinforcement Learning},
  author={Zuxin Liu and Zijian Guo and Haohong Lin and Yihang Yao and Jiacheng Zhu and Zhepeng Cen and Hanjiang Hu and Wenhao Yu and Tingnan Zhang and Jie Tan and Ding Zhao},
  journal={Journal of Data-centric Machine Learning Research},
  year={2024}
}

Structure

The structure of this repo is as follows:

├── examples
│   ├── configs  # the training configs of each algorithm
│   ├── eval     # the evaluation escipts
│   ├── train    # the training scipts
├── osrl
│   ├── algorithms  # offline safe RL algorithms
│   ├── common      # base networks and utils

The implemented offline safe RL and imitation learning algorithms include:

Algorithm	Type	Description
BCQ-Lag	Q-learning	BCQ with PID Lagrangian
BEAR-Lag	Q-learning	BEARL with PID Lagrangian
CPQ	Q-learning	Constraints Penalized Q-learning (CPQ))
COptiDICE	Distribution Correction Estimation	Offline Constrained Policy Optimization via stationary DIstribution Correction Estimation
CDT	Sequential Modeling	Constrained Decision Transformer
BC-All	Imitation Learning	Behavior Cloning with all datasets
BC-Safe	Imitation Learning	Behavior Cloning with safe trajectories
BC-Frontier	Imitation Learning	Behavior Cloning with high-reward trajectories

Installation

OSRL is currently hosted on PyPI, you can simply install it by:

pip install osrl-lib

You can also pull the repo and install:

git clone https://github.com/liuzuxin/OSRL.git
cd osrl
pip install -e .

If you want to use the CDT algorithm, please also manually install the OApackage:

pip install OApackage==2.7.6

How to use OSRL

The example usage are in the examples folder, where you can find the training and evaluation scripts for all the algorithms. All the parameters and their default configs for each algorithm are available in the examples/configs folder. OSRL uses the WandbLogger in FSRL and Pyrallis configuration system. The offline dataset and offline environments are provided in DSRL, so make sure you install both of them first.

Training

For example, to train the bcql method, simply run by overriding the default parameters:

python examples/train/train_bcql.py --task OfflineCarCircle-v0 --param1 args1 ...

By default, the config file and the logs during training will be written to logs\ folder and the training plots can be viewed online using Wandb.

You can also launch a sequence of experiments or in parallel via the EasyRunner package, see examples/train_all_tasks.py for details.

Evaluation

To evaluate a trained agent, for example, a BCQ agent, simply run

python examples/eval/eval_bcql.py --path path_to_model --eval_episodes 20

It will load config file from path_to_model/config.yaml and model file from path_to_model/checkpoints/model.pt, run 20 episodes, and print the average normalized reward and cost. The pretrained checkpoints for all datasets are available here for reference.

Acknowledgement

The framework design and most baseline implementations of OSRL are heavily inspired by the CORL project, which is a great library for offline RL, and the cleanrl project, which targets online RL. So do check them out if you are interested!

Contributing

If you have any suggestions or find any bugs, please feel free to submit an issue or a pull request. We welcome contributions from the community!