The Autonomous Learning Library: A PyTorch Library for Building Reinforcement Learning Agents

The autonomous-learning-library is an object-oriented deep reinforcement learning (DRL) library for PyTorch. The goal of the library is to provide the necessary components for quickly building and evaluating novel reinforcement learning agents, as well as providing high-quality reference implementations of modern DRL algorithms. The full documentation can be found at the following URL: https://autonomous-learning-library.readthedocs.io.

Tools for Building New Agents

The primary goal of the autonomous-learning-library is to facilitate the rapid development of new reinforcement learning agents by providing common tools for building and evaluation agents, such as:

A flexible function Approximation API that integrates features such as target networks, gradient clipping, learning rate schedules, model checkpointing, multi-headed networks, loss scaling, logging, and more.
Various memory buffers, including prioritized experience replay (PER), generalized advantage estimation (GAE), and more.
A torch-based Environment interface that simplies agent implementations by cutting out the numpy middleman.
Common wrappers and agent enhancements for replicating standard benchmarks.
Slurm integration for running large-scale experiments.
Plotting and logging utilities including tensorboard integration and utilities for generating common plots.

See the documentation guide for a full description of the functionality provided by the autonomous-learning-library. Additionally, we provide an example project which demonstrates the best practices for building new agents.

High-Quality Reference Implementations

The autonomous-learning-library separates reinforcement learning agents into two modules: all.agents, which provides flexible, high-level implementations of many common algorithms which can be adapted to new problems and environments, and all.presets which provides specific instansiations of these agents tuned for particular sets of environments, including Atari games, classic control tasks, and PyBullet robotics simulations. Some benchmark results showing results on-par with published results can be found below:

As of today, all contains implementations of the following deep RL algorithms:

Advantage Actor-Critic (A2C)
Categorical DQN (C51)
Deep Deterministic Policy Gradient (DDPG)
Deep Q-Learning (DQN) + extensions
Proximal Policy Optimization (PPO)
Rainbow (Rainbow)
Soft Actor-Critic (SAC)

It also contains implementations of the following "vanilla" agents, which provide useful baselines and perform better than you may expect:

Vanilla Actor-Critic
Vanilla Policy Gradient
Vanilla Q-Learning
Vanilla Sarsa

Installation

First, you will need a new version of PyTorch (>1.3), as well as Tensorboard. Then, you can install the autonomous-learning-library through PyPi:

pip install autonomous-learning-library

Alternately, you can install directly from this repository:

git clone https://github.com/cpnota/autonomous-learning-library.git
cd autonomous-learning-library
pip install -e .

You can also install the prerequisites using:

pip install autonomous-learning-library[pytorch]

Running the Presets

If you just want to test out some cool agents, the scripts directory contains the basic code for doing so.

python scripts/atari.py Breakout a2c

You can watch the training progress using:

tensorboard --logdir runs

and opening your browser to http://localhost:6006. Once the model is trained to your satisfaction, you can watch the trained model play using:

python scripts/watch_atari.py Breakout "runs/_a2c [id]"

where id is the ID of your particular run. You should should be able to find it using tab completion or by looking in the runs directory. The autonomous-learning-library also contains presets and scripts for classic control and PyBullet environments.

Note

This library was built in the Autonomous Learning Laboratory (ALL) at the University of Massachusetts, Amherst. It was written and is currently maintained by Chris Nota (@cpnota). The views expressed or implied in this repository do not necessarily reflect the views of the ALL.