wehub-resource-sync
74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
from typing import Optional, Tuple
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from ray.rllib.env.multi_agent_env import MultiAgentEnv
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from ray.rllib.utils.typing import MultiAgentDict
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class MultiAgentEnvCompatibility(MultiAgentEnv):
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"""A wrapper converting MultiAgentEnv from old gym API to the new one.
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"Old API" refers to step() method returning (observation, reward, done, info),
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and reset() only retuning the observation.
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"New API" refers to step() method returning (observation, reward, terminated,
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truncated, info) and reset() returning (observation, info).
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Known limitations:
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- Environments that use `self.np_random` might not work as expected.
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"""
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def __init__(self, old_env, render_mode: Optional[str] = None):
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"""A wrapper which converts old-style envs to valid modern envs.
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Some information may be lost in the conversion, so we recommend updating your
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environment.
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Args:
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old_env: The old MultiAgentEnv to wrap. Implemented with the old API.
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render_mode: The render mode to use when rendering the environment,
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passed automatically to `env.render()`.
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"""
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super().__init__()
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self.metadata = getattr(old_env, "metadata", {"render_modes": []})
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self.render_mode = render_mode
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self.reward_range = getattr(old_env, "reward_range", None)
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self.spec = getattr(old_env, "spec", None)
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self.env = old_env
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self.observation_space = old_env.observation_space
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self.action_space = old_env.action_space
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def reset(
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self, *, seed: Optional[int] = None, options: Optional[dict] = None
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) -> Tuple[MultiAgentDict, MultiAgentDict]:
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# Use old `seed()` method.
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if seed is not None:
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self.env.seed(seed)
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# Options are ignored
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if self.render_mode == "human":
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self.render()
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obs = self.env.reset()
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infos = {k: {} for k in obs.keys()}
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return obs, infos
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def step(
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self, action
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) -> Tuple[
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MultiAgentDict, MultiAgentDict, MultiAgentDict, MultiAgentDict, MultiAgentDict
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]:
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obs, rewards, terminateds, infos = self.env.step(action)
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# Truncated should always be False by default.
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truncateds = {k: False for k in terminateds.keys()}
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return obs, rewards, terminateds, truncateds, infos
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def render(self):
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# Use the old `render()` API, where we have to pass in the mode to each call.
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return self.env.render(mode=self.render_mode)
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def close(self):
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self.env.close()
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