jumanji 0.1.6

Industry-Driven Hardware-Accelerated RL Environments

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Installation | Quickstart | Examples | Environments | Citation | See Also | Reference Docs

Welcome to the Jungle! 🌴

Jumanji is a suite of Reinforcement Learning (RL) environments written in JAX providing clean, hardware-accelerated environments for industry-driven research.

Jumanji is helping pioneer a new wave of hardware-accelerated research and development in the field of RL. Jumanji's high-speed environments enable faster iteration and larger-scale experimentation while simultaneously reducing complexity. Originating in the Research Team at InstaDeep, Jumanji is now developed jointly with the open-source community. To join us in these efforts, reach out, raise issues and read our contribution guidelines (or just star 🌟 to stay up to date with the latest developments)!

Goals 🚀

1. Provide a simple, well-tested API for JAX-based environments.
2. Make research in RL more accessible.
3. Facilitate the research on RL for problems in the industry and help close the gap between research and industrial applications.

Overview 🦜

• 🥑 Environment API: core abstractions for JAX-based environments and their variations, e.g. multi-agent or turn-by-turn.
• 🕹️ Environment Suite: a list of RL environments ranging from simple games to complex NP-hard problems.
• 🍬 Wrappers: easily connect to your favourite RL frameworks and libraries such as Acme, Stable Baselines3, RLlib, OpenAI Gym, and DeepMind-Env.
• 🎓 Educational Examples and User Guides: guides to facilitate Jumanji's adoption and highlight the added value of JAX-based environments.

Installation 🎬

You can install the latest release of Jumanji from PyPI:

pip install jumanji

or you can install the latest development version directly from GitHub:

pip install git+https://github.com/instadeepai/jumanji.git

Jumanji has been tested on Python 3.7, 3.8 and 3.9. Note that because the installation of JAX differs depending on your hardware accelerator, we advise users to explicitly install the correct JAX version (see the official installation guide).

Rendering: Matplotlib is used for rendering the BinPack and Snake environments. To visualize the environments you will need a GUI backend. For example, on Linux, you can install Tk via: apt-get install python3-tk, or using conda: conda install tk. Check out Matplotlib backends for a list of backends you could use.

Quickstart ⚡

Practitioners will find Jumanji's interface familiar as it combines the widely adopted OpenAI Gym and DeepMind Environment interfaces. From OpenAI Gym, we adopted the idea of a registry and the render method, while our TimeStep structure is inspired by dm_env.TimeStep.

Basic Usage 🧑‍💻

import jax
import jumanji

# Instantiate a Jumanji environment using the registry
env = jumanji.make('Snake-6x6-v0')

# Reset your (jit-able) environment
key = jax.random.PRNGKey(0)
state, timestep = jax.jit(env.reset)(key)

# (Optional) Render the env state
env.render(state)

# Interact with the (jit-able) environment
action = env.action_spec().generate_value()          # Action selection (dummy value here)
state, timestep = jax.jit(env.step)(state, action)   # Take a step and observe the next state and time step

where:

• state represents the internal state of an environment: it contains all the information required to take a step when executing an action. This should not be confused with the observation contained in the timestep, which is the information perceived by the agent.
• timestep is a dataclass containing step_type, reward, discount, observation, and extras. This structure is similar to dm_env.TimeStep except for the extras field that was added to allow users to retrieve information that is neither part of the agent's observation nor part of the environment's internal state.

Advanced Usage 🧑‍🔬

Being written in JAX, Jumanji's environments benefit from many of its features including automatic vectorization/parallelization (jax.vmap, jax.pmap) and JIT-compilation (jax.jit), which can be composed arbitrarily. We provide an example of this below, where we use jax.vmap and jax.lax.scan to generate a batch of rollouts in the Snake environment.

import jax

import jumanji
from jumanji.wrappers import AutoResetWrapper

env = jumanji.make("Snake-6x6-v0")  # Creates the snake environment.
env = AutoResetWrapper(env)         # Automatically reset the environment when an episode terminates.

batch_size, rollout_length = 7, 5
num_actions = env.action_spec().num_values

random_key = jax.random.PRNGKey(0)
key1, key2 = jax.random.split(random_key)

def step_fn(state, key):
  action = jax.random.randint(key=key, minval=0, maxval=num_actions, shape=())
  new_state, timestep = env.step(state, action)
  return new_state, timestep

def run_n_step(state, key, n):
  random_keys = jax.random.split(key, n)
  state, rollout = jax.lax.scan(step_fn, state, random_keys)
  return rollout

# Instantiate a batch of environment states
keys = jax.random.split(key1, batch_size)
state, timestep = jax.vmap(env.reset)(keys)

# Collect a batch of rollouts
keys = jax.random.split(key2, batch_size)
rollout = jax.vmap(run_n_step, in_axes=(0, 0, None))(state, keys, rollout_length)

# Shape and type of given rollout:
# TimeStep(step_type=(7, 5), reward=(7, 5), discount=(7, 5), observation=(7, 5, 6, 6, 5), extras=None)

Examples 🕹️

For more in-depth examples of running with Jumanji environments, check out our Colab notebooks:

Example	Topic	Colab
Online Q-Learning	RL Training (Anakin)

Environments 🌍

Jumanji implements different types of environments ranging from simple games to NP-hard problems, from single-agent to multi-agent and turn-by-turn games.

Environment	Category	Type	Source	Description
🐍 Snake	Game	Single-agent	code	doc
4️⃣ Connect4	Game	Turn-by-turn	code	doc
📬 TSP (Travelling Salesman Problem)	Combinatorial	Single-agent	code	doc
🎒 Knapsack	Combinatorial	Single-agent	code	doc
🪢 Routing	Combinatorial	Multi-agent	code	doc
📦 BinPack (3D BinPacking Problem)	Combinatorial	Single-agent	code	doc
🚚 CVRP (Capacitated Vehicle Routing Problem)	Combinatorial	Single-agent	code	doc

Registry and Versioning 📖

Similarly to OpenAI Gym, Jumanji keeps a strict versioning of its environments for reproducibility reasons. We maintain a registry of standard environments with their configuration. For each environment, a version suffix is appended, e.g. Snake-6x6-v0. When changes are made to environments that might impact learning results, the version number is incremented by one to prevent potential confusion. For a full list of registered versions of each environment, check out the documentation.

Contributing 🤝

Contributions are welcome! See our issue tracker for good first issues. Please read our contributing guidelines for details on how to submit pull requests, our Contributor License Agreement, and community guidelines.

Citing Jumanji ✏️

If you use Jumanji in your work, please cite the library using:

@software{jumanji2022github,
  author = {Clément Bonnet and Donal Byrne and Victor Le and Laurence Midgley
        and Daniel Luo and Cemlyn Waters and Sasha Abramowitz and Edan Toledo
        and Cyprien Courtot and Matthew Morris and Daniel Furelos-Blanco
        and Nathan Grinsztajn and Thomas D. Barrett and Alexandre Laterre},
  title = {Jumanji: Industry-Driven Hardware-Accelerated RL Environments},
  url = {https://github.com/instadeepai/jumanji},
  version = {0.1.6},
  year = {2022},
}

See Also

Other works have embraced the approach of writing RL environments in JAX. In particular, we suggest users check out the following sister repositories:

• 🦾 Brax is a differentiable physics engine that simulates environments made up of rigid bodies, joints, and actuators.
• 🏋️‍ Gymnax implements classic environments including classic control, bsuite, MinAtar and a collection of meta RL tasks.
• 🌳 Evojax provides tools to enable neuroevolution algorithms to work with neural networks running across multiple TPU/GPUs.
• 🤖 Qdax is a library to accelerate Quality-Diversity and neuro-evolution algorithms through hardware accelerators and parallelization.

Acknowledgements 🙏

The development of this library was supported with Cloud TPUs from Google's TPU Research Cloud (TRC) 🌤.