.. Tianshou documentation master file, created by
   sphinx-quickstart on Sat Mar 28 15:58:19 2020.
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Welcome to Tianshou!
====================

**Tianshou** (`天授 <https://baike.baidu.com/item/%E5%A4%A9%E6%8E%88>`_) is a reinforcement learning platform based on pure PyTorch. Unlike existing reinforcement learning libraries, which are mainly based on TensorFlow, have many nested classes, unfriendly API, or slow-speed, Tianshou provides a fast-speed framework and pythonic API for building the deep reinforcement learning agent. The supported interface algorithms include:

* :class:`~tianshou.policy.PGPolicy` `Policy Gradient <https://papers.nips.cc/paper/1713-policy-gradient-methods-for-reinforcement-learning-with-function-approximation.pdf>`_
* :class:`~tianshou.policy.DQNPolicy` `Deep Q-Network <https://storage.googleapis.com/deepmind-media/dqn/DQNNaturePaper.pdf>`_
* :class:`~tianshou.policy.DQNPolicy` `Double DQN <https://arxiv.org/pdf/1509.06461.pdf>`_
* :class:`~tianshou.policy.DQNPolicy` `Dueling DQN <https://arxiv.org/pdf/1511.06581.pdf>`_
* :class:`~tianshou.policy.C51Policy` `C51 <https://arxiv.org/pdf/1707.06887.pdf>`_
* :class:`~tianshou.policy.A2CPolicy` `Advantage Actor-Critic <https://openai.com/blog/baselines-acktr-a2c/>`_
* :class:`~tianshou.policy.DDPGPolicy` `Deep Deterministic Policy Gradient <https://arxiv.org/pdf/1509.02971.pdf>`_
* :class:`~tianshou.policy.PPOPolicy` `Proximal Policy Optimization <https://arxiv.org/pdf/1707.06347.pdf>`_
* :class:`~tianshou.policy.TD3Policy` `Twin Delayed DDPG <https://arxiv.org/pdf/1802.09477.pdf>`_
* :class:`~tianshou.policy.SACPolicy` `Soft Actor-Critic <https://arxiv.org/pdf/1812.05905.pdf>`_
* :class:`~tianshou.policy.DiscreteSACPolicy` `Discrete Soft Actor-Critic <https://arxiv.org/pdf/1910.07207.pdf>`_
* :class:`~tianshou.policy.ImitationPolicy` Imitation Learning
* :class:`~tianshou.policy.DiscreteBCQPolicy` `Discrete Batch-Constrained deep Q-Learning <https://arxiv.org/pdf/1910.01708.pdf>`_
* :class:`~tianshou.policy.PSRLPolicy` `Posterior Sampling Reinforcement Learning <https://www.ece.uvic.ca/~bctill/papers/learning/Strens_2000.pdf>`_
* :class:`~tianshou.data.PrioritizedReplayBuffer` `Prioritized Experience Replay <https://arxiv.org/pdf/1511.05952.pdf>`_
* :meth:`~tianshou.policy.BasePolicy.compute_episodic_return` `Generalized Advantage Estimator <https://arxiv.org/pdf/1506.02438.pdf>`_

Here is Tianshou's other features:

* Elegant framework, using only ~2000 lines of code
* Support parallel environment simulation (synchronous or asynchronous) for all algorithms: :ref:`parallel_sampling`
* Support recurrent state representation in actor network and critic network (RNN-style training for POMDP): :ref:`rnn_training`
* Support any type of environment state/action (e.g. a dict, a self-defined class, ...): :ref:`self_defined_env`
* Support :ref:`customize_training`
* Support n-step returns estimation :meth:`~tianshou.policy.BasePolicy.compute_nstep_return` and prioritized experience replay :class:`~tianshou.data.PrioritizedReplayBuffer` for all Q-learning based algorithms; GAE, nstep and PER are very fast thanks to numba jit function and vectorized numpy operation
* Support :doc:`/tutorials/tictactoe`
* Comprehensive `unit tests <https://github.com/thu-ml/tianshou/actions>`_, including functional checking, RL pipeline checking, documentation checking, PEP8 code-style checking, and type checking

中文文档位于 `https://tianshou.readthedocs.io/zh/latest/ <https://tianshou.readthedocs.io/zh/latest/>`_


Installation
------------

Tianshou is currently hosted on `PyPI <https://pypi.org/project/tianshou/>`_ and `conda-forge <https://github.com/conda-forge/tianshou-feedstock>`_. It requires Python >= 3.6.

You can simply install Tianshou from PyPI with the following command:

.. code-block:: bash

    $ pip install tianshou

If you use Anaconda or Miniconda, you can install Tianshou from conda-forge through the following command:

.. code-block:: bash

    $ conda -c conda-forge install tianshou

You can also install with the newest version through GitHub:

.. code-block:: bash

    $ pip install git+https://github.com/thu-ml/tianshou.git@master --upgrade

After installation, open your python console and type
::

    import tianshou
    print(tianshou.__version__)

If no error occurs, you have successfully installed Tianshou.

Tianshou is still under development, you can also check out the documents in stable version through `tianshou.readthedocs.io/en/stable/ <https://tianshou.readthedocs.io/en/stable/>`_.


.. toctree::
   :maxdepth: 1
   :caption: Tutorials

   tutorials/dqn
   tutorials/concepts
   tutorials/batch
   tutorials/tictactoe
   tutorials/trick
   tutorials/cheatsheet


.. toctree::
   :maxdepth: 1
   :caption: API Docs

   api/tianshou.data
   api/tianshou.env
   api/tianshou.policy
   api/tianshou.trainer
   api/tianshou.exploration
   api/tianshou.utils


.. toctree::
   :maxdepth: 1
   :caption: Community

   contributing
   contributor


Indices and tables
------------------

* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`