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Maintained Fork

The maintained version of these environments, which include numerous fixes, comprehensive documentation, support for installation via pip, and support for current versions of Python are available in Gymnasium Robotics (https://github.com/Farama-Foundation/Gymnasium-Robotics, https://robotics.farama.org/)

Multi-Agent Mujoco

Benchmark for Continuous Multi-Agent Robotic Control, based on OpenAI's Mujoco Gym environments.

Described in the paper Deep Multi-Agent Reinforcement Learning for Decentralized Continuous Cooperative Control by Christian Schroeder de Witt, Bei Peng, Pierre-Alexandre Kamienny, Philip Torr, Wendelin Böhmer and Shimon Whiteson, Torr Vision Group and Whiteson Research Lab, University of Oxford, 2020

Installation

Note: You require OpenAI Gym Version 0.10.8 and Mujoco 2.1

Simply clone this repository and put ./src on your PYTHONPATH. To render, please also set the following environment variables:

LD_LIBRARY_PATH=${HOME}/.mujoco/mujoco210/bin;
LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libGLEW.so

Example

from multiagent_mujoco.mujoco_multi import MujocoMulti
import numpy as np
import time


def main():
    env_args = {"scenario": "HalfCheetah-v2",
                  "agent_conf": "2x3",
                  "agent_obsk": 0,
                  "episode_limit": 1000}
    env = MujocoMulti(env_args=env_args)
    env_info = env.get_env_info()

    n_actions = env_info["n_actions"]
    n_agents = env_info["n_agents"]
    n_episodes = 10

    for e in range(n_episodes):
        env.reset()
        terminated = False
        episode_reward = 0

        while not terminated:
            obs = env.get_obs()
            state = env.get_state()

            actions = []
            for agent_id in range(n_agents):
                avail_actions = env.get_avail_agent_actions(agent_id)
                avail_actions_ind = np.nonzero(avail_actions)[0]
                action = np.random.uniform(-1.0, 1.0, n_actions)
                actions.append(action)

            reward, terminated, _ = env.step(actions)
            episode_reward += reward

            time.sleep(0.1)
            env.render()


        print("Total reward in episode {} = {}".format(e, episode_reward))

    env.close()

if __name__ == "__main__":
    main()

Documentation

Environment config

• env_args.scenario: Determines the underlying single-agent OpenAI Gym Mujoco environment
• env_args.agent_conf: Determines the partitioning (see in Environment section below), fixed by n_agents x motors_per_agent
• env_args.agent_obsk: Determines up to which connection distance k agents will be able to form observations (0: agents can only observe the state of their own joints and bodies, 1: agents can observe their immediate neighbour's joints and bodies).
• env_args.k_categories: A string describing which properties are observable at which connection distance as comma-separated lists separated by vertical bars. For example, "qpos,qvel,cfrc_ext,cvel,cinert,qfrc_actuator|qpos" means k=0 can observe properties qpos,qvel,cfrc_ext,cvel,cinert,qfrc_actuator and k>=1 (i.e. immediate and more distant neighbours) can be observed through property qpos. Note: If a property requested is not available for a given agent, it will be silently omitted.
• env_args.global_categories: Same as env_args.k_categories, but concerns some global properties that are otherwise not observed by any of the agents. Switched off by default (i.e. agents have no non-local observations).

Extending Tasks

Tasks can be trivially extended by adding entries in src/multiagent_mujoco/obsk.py.

Task configuration

Unless stated otherwise, all the parameters given below are to be used with .multiagent_mujoco.MujocoMulti.

2-Agent Ant

env_args.scenario="Ant-v2"
env_args.agent_conf="2x4"
env_args.agent_obsk=1

2-Agent Ant Diag

env_args.scenario="Ant-v2"
env_args.agent_conf="2x4d"
env_args.agent_obsk=1

4-Agent Ant

env_args.scenario="Ant-v2"
env_args.agent_conf="4x2"
env_args.agent_obsk=1

2-Agent HalfCheetah

env_args.scenario="HalfCheetah-v2"
env_args.agent_conf="2x3"
env_args.agent_obsk=1

6-Agent HalfCheetah

env_args.scenario="HalfCheetah-v2"
env_args.agent_conf="6x1"
env_args.agent_obsk=1

3-Agent Hopper

env_args.scenario="Hopper-v2"
env_args.agent_conf="3x1"
env_args.agent_obsk=1

2-Agent Humanoid

env_args.scenario="Humanoid-v2"
env_args.agent_conf="9|8"
env_args.agent_obsk=1

2-Agent HumanoidStandup

env_args.scenario="HumanoidStandup-v2"
env_args.agent_conf="9|8"
env_args.agent_obsk=1

2-Agent Reacher

env_args.scenario="Reacher-v2"
env_args.agent_conf="2x1"
env_args.agent_obsk=1

2-Agent Swimmer

env_args.scenario="Swimmer-v2"
env_args.agent_conf="2x1"
env_args.agent_obsk=1

2-Agent Walker

env_args.scenario="Walker2d-v2"
env_args.agent_conf="2x3"
env_args.agent_obsk=1

Manyagent Swimmer

env_args.scenario="manyagent_swimmer"
env_args.agent_conf="10x2"
env_args.agent_obsk=1

Manyagent Ant

env_args.scenario="manyagent_ant"
env_args.agent_conf="2x3"
env_args.agent_obsk=1

Coupled HalfCheetah (NEW!)

env_args.scenario="coupled_half_cheetah"
env_args.agent_conf="1p1"
env_args.agent_obsk=1

CoupledHalfCheetah features two separate HalfCheetah agents coupled by an elastic tendon. You can add more tendons or novel coupled scenarios by

1. Creating a new Gym environment to define the reward function of the coupled scenario (consult coupled_half_cheetah.py)
2. Create a new Mujoco environment XML file to insert agents and tendons (see assets/coupled_half_cheetah.xml)
3. Register your env as a scenario in the MujocoMulti environment (only if you need special default observability params)