d3rlpy: An offline deep reinforcement learning library

d3rlpy is an offline deep reinforcement learning library for practitioners and researchers.

import d3rlpy

# MDPDataset takes arrays of state transitions
dataset = d3rlpy.dataset.MDPDataset(observations, actions, rewards, terminals)

# train offline deep RL
cql = d3rlpy.algos.CQL()
cql.fit(dataset.episodes)

# ready to control
actions = cql.predict(x)

Documentation: https://d3rlpy.readthedocs.io

key features

⚡️ Most Practical RL Library Ever

• offline RL: d3rlpy supports state-of-the-art offline RL algorithms. Offline RL is extremely powerful when the online interaction is not feasible during training (e.g. robotics, medical).
• online RL: d3rlpy also supports conventional state-of-the-art online training algorithms without any compromising, which means that you can solve any kinds of RL problems only with d3rlpy.
• advanced engineering: d3rlpy is designed to implement the faster and efficient training algorithms. For example, you can train Atari environments with x4 less memory space and as fast as the fastest RL library.

🔰 Easy-To-Use API

• zero-knowledge of DL library: d3rlpy provides many state-of-the-art algorithms through intuitive APIs. You can become a RL engineer even without knowing how to use deep learning libraries.
• scikit-learn compatibility: d3rlpy is not only easy, but also completely compatible with scikit-learn API, which means that you can maximize your productivity with the useful scikit-learn's utilities.

🚀 Beyond State-Of-The-Art

• distributional Q function: d3rlpy is the first library that supports distributional Q functions in the all algorithms. The distributional Q function is known as the very powerful method to achieve the state-of-the-performance.
• many tweek options: d3rlpy is also the first to support N-step TD backup, ensemble value functions and data augmentation in the all algorithms, which lead you to the place no one ever reached yet.

installation

d3rlpy supports Linux, macOS and Windows.

PyPI (recommended)

$ pip install d3rlpy

Anaconda

$ conda install -c conda-forge d3rlpy

Docker

$ docker run -it --gpus all --name d3rlpy takuseno/d3rlpy:latest bash

build from source (please try this if core dumped error occurs)

$ git clone https://github.com/takuseno/d3rlpy
$ cd d3rlpy
$ pip install Cython numpy # if not installed yet
$ pip install -e .

supported algorithms

supported Q functions

• [x] standard Q function
• [x] Quantile Regression
• [x] Implicit Quantile Network
• [x] Fully parametrized Quantile Function (experimental)

other features

Basically, all features are available with every algorithm.

• [x] evaluation metrics in a scikit-learn scorer function style
• [x] export greedy-policy as TorchScript or ONNX
• [x] parallel cross validation with multiple GPU
• [x] model-based algorithm

examples

MuJoCo

import d3rlpy

# prepare dataset
dataset, env = d3rlpy.datasets.get_d4rl('hopper-medium-v0')

# prepare algorithm
cql = d3rlpy.algos.CQL(use_gpu=True)

# train
cql.fit(dataset,
        eval_episodes=dataset,
        n_epochs=100,
        scorers={
            'environment': d3rlpy.metrics.scorer.evaluate_on_environment(env),
            'td_error': d3rlpy.metrics.scorer.td_error_scorer
        })

See more datasets at d4rl.

Atari 2600

import d3rlpy
from sklearn.model_selection import train_test_split

# prepare dataset
dataset, env = d3rlpy.datasets.get_atari('breakout-expert-v0')

# split dataset
train_episodes, test_episodes = train_test_split(dataset, test_size=0.1)

# prepare algorithm
cql = d3rlpy.algos.DiscreteCQL(n_frames=4, q_func_factory='qr', scaler='pixel', use_gpu=True)

# start training
cql.fit(train_episodes,
        eval_episodes=test_episodes,
        n_epochs=100,
        scorers={
            'environment': d3rlpy.metrics.scorer.evaluate_on_environment(env),
            'td_error': d3rlpy.metrics.scorer.td_error_scorer
        })

See more Atari datasets at d4rl-atari.

PyBullet

import d3rlpy

# prepare dataset
dataset, env = d3rlpy.datasets.get_pybullet('hopper-bullet-mixed-v0')

# prepare algorithm
cql = d3rlpy.algos.CQL(use_gpu=True)

# start training
cql.fit(dataset,
        eval_episodes=dataset,
        n_epochs=100,
        scorers={
            'environment': d3rlpy.metrics.scorer.evaluate_on_environment(env),
            'td_error': d3rlpy.metrics.scorer.td_error_scorer
        })

See more PyBullet datasets at d4rl-pybullet.

Online Training

import d3rlpy
import gym

# prepare environment
env = gym.make('HopperBulletEnv-v0')
eval_env = gym.make('HopperBulletEnv-v0')

# prepare algorithm
sac = d3rlpy.algos.SAC(use_gpu=True)

# prepare replay buffer
buffer = d3rlpy.online.buffers.ReplayBuffer(maxlen=1000000, env=env)

# start training
sac.fit_online(env, buffer, n_steps=1000000, eval_env=eval_env)

tutorials

Try a cartpole example on Google Colaboratory!

• offline RL tutorial:
• online RL tutorial:

contributions

Any kind of contribution to d3rlpy would be highly appreciated! Please check the contribution guide.

The release planning can be checked at milestones.

community

family projects

citation

@misc{seno2020d3rlpy,
  author = {Takuma Seno},
  title = {d3rlpy: An offline deep reinforcement library},
  year = {2020},
  publisher = {GitHub},
  journal = {GitHub repository},
  howpublished = {\url{https://github.com/takuseno/d3rlpy}}
}

acknowledgement

This work is supported by Information-technology Promotion Agency, Japan (IPA), Exploratory IT Human Resources Project (MITOU Program) in the fiscal year 2020.