AlgorithmConfig.get_multi_agent_setup(*, policies: Dict[str, PolicySpec] | None = None, env: Any | gymnasium.Env | None = None, spaces: Dict[str, Tuple[gymnasium.Space, gymnasium.Space]] | None = None, default_policy_class: Type[Policy] | None = None) Tuple[Dict[str, PolicySpec], Callable[[str, SampleBatch | MultiAgentBatch], bool]][source]#

Compiles complete multi-agent config (dict) from the information in self.

Infers the observation- and action spaces, the policy classes, and the policy’s configs. The returned MultiAgentPolicyConfigDict is fully unified and strictly maps PolicyIDs to complete PolicySpec objects (with all their fields not-None).

Examples: .. testcode:

import gymnasium as gym
from ray.rllib.algorithms.ppo import PPOConfig
config = (
  .multi_agent(policies={"pol1", "pol2"}, policies_to_train=["pol1"])
policy_dict, is_policy_to_train = config.get_multi_agent_setup(
  • policies – An optional multi-agent policies dict, mapping policy IDs to PolicySpec objects. If not provided, will use self.policies instead. Note that the policy_class, observation_space, and action_space properties in these PolicySpecs may be None and must therefore be inferred here.

  • env – An optional env instance, from which to infer the different spaces for the different policies. If not provided, will try to infer from spaces. Otherwise from self.observation_space and self.action_space. If no information on spaces can be infered, will raise an error.

  • spaces – Optional dict mapping policy IDs to tuples of 1) observation space and 2) action space that should be used for the respective policy. These spaces were usually provided by an already instantiated remote EnvRunner. Note that if the env argument is provided, will try to infer spaces from env first.

  • default_policy_class – The Policy class to use should a PolicySpec have its policy_class property set to None.


A tuple consisting of 1) a MultiAgentPolicyConfigDict and 2) a is_policy_to_train(PolicyID, SampleBatchType) -> bool callable.

  • ValueError – In case, no spaces can be infered for the policy/ies.

  • ValueError – In case, two agents in the env map to the same PolicyID (according to self.policy_mapping_fn), but have different action- or observation spaces according to the infered space information.