55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
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import gym
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import numpy as np
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from typing import List, Callable, Tuple, Optional, Any
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from tianshou.env.worker import EnvWorker
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try:
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import ray
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except ImportError:
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pass
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class RayEnvWorker(EnvWorker):
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"""Ray worker used in RayVectorEnv."""
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def __init__(self, env_fn: Callable[[], gym.Env]) -> None:
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super().__init__(env_fn)
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self.env = ray.remote(gym.Wrapper).options(num_cpus=0).remote(env_fn())
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def __getattr__(self, key: str):
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return ray.get(self.env.__getattr__.remote(key))
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def reset(self) -> Any:
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return ray.get(self.env.reset.remote())
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@staticmethod
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def wait(workers: List['RayEnvWorker'],
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wait_num: int,
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timeout: Optional[float] = None) -> List['RayEnvWorker']:
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results = [x.result for x in workers]
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ready_results, _ = ray.wait(results,
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num_returns=wait_num, timeout=timeout)
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return [workers[results.index(result)] for result in ready_results]
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def send_action(self, action: np.ndarray) -> None:
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# self.action is actually a handle
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self.result = self.env.step.remote(action)
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def get_result(self) -> Tuple[
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np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
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return ray.get(self.result)
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def seed(self, seed: Optional[int] = None) -> List[int]:
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if hasattr(self.env, 'seed'):
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return ray.get(self.env.seed.remote(seed))
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return None
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def render(self, **kwargs) -> Any:
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if hasattr(self.env, 'render'):
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return ray.get(self.env.render.remote(**kwargs))
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return None
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def close_env(self) -> None:
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ray.get(self.env.close.remote())
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