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92 行
3.5 KiB
92 行
3.5 KiB
from typing import Dict, List
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from mlagents.envs.base_env import BaseEnv
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from mlagents.trainers.env_manager import EnvManager, EnvironmentStep
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from mlagents.envs.timers import timed
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from mlagents.trainers.action_info import ActionInfo
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from mlagents.trainers.brain import BrainParameters, AllBrainInfo
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from mlagents.envs.side_channel.float_properties_channel import FloatPropertiesChannel
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from mlagents.trainers.brain_conversion_utils import (
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step_result_to_brain_info,
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group_spec_to_brain_parameters,
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)
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class SimpleEnvManager(EnvManager):
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"""
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Simple implementation of the EnvManager interface that only handles one BaseEnv at a time.
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This is generally only useful for testing; see SubprocessEnvManager for a production-quality implementation.
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"""
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def __init__(self, env: BaseEnv, float_prop_channel: FloatPropertiesChannel):
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super().__init__()
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self.shared_float_properties = float_prop_channel
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self.env = env
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self.previous_step: EnvironmentStep = EnvironmentStep(None, {}, None)
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self.previous_all_action_info: Dict[str, ActionInfo] = {}
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def step(self) -> List[EnvironmentStep]:
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all_action_info = self._take_step(self.previous_step)
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self.previous_all_action_info = all_action_info
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for brain_name, action_info in all_action_info.items():
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self.env.set_actions(brain_name, action_info.action)
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self.env.step()
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all_brain_info = self._generate_all_brain_info()
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step_brain_info = all_brain_info
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step_info = EnvironmentStep(
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self.previous_step.current_all_brain_info,
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step_brain_info,
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self.previous_all_action_info,
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)
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self.previous_step = step_info
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return [step_info]
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def reset(
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self, config: Dict[str, float] = None
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) -> List[EnvironmentStep]: # type: ignore
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if config is not None:
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for k, v in config.items():
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self.shared_float_properties.set_property(k, v)
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self.env.reset()
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all_brain_info = self._generate_all_brain_info()
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self.previous_step = EnvironmentStep(None, all_brain_info, None)
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return [self.previous_step]
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@property
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def external_brains(self) -> Dict[str, BrainParameters]:
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result = {}
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for brain_name in self.env.get_agent_groups():
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result[brain_name] = group_spec_to_brain_parameters(
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brain_name, self.env.get_agent_group_spec(brain_name)
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)
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return result
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@property
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def get_properties(self) -> Dict[str, float]:
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reset_params = {}
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for k in self.shared_float_properties.list_properties():
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reset_params[k] = self.shared_float_properties.get_property(k)
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return reset_params
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def close(self):
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self.env.close()
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@timed
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def _take_step(self, last_step: EnvironmentStep) -> Dict[str, ActionInfo]:
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all_action_info: Dict[str, ActionInfo] = {}
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for brain_name, brain_info in last_step.current_all_brain_info.items():
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all_action_info[brain_name] = self.policies[brain_name].get_action(
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brain_info
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)
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return all_action_info
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def _generate_all_brain_info(self) -> AllBrainInfo:
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all_brain_info = {}
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for brain_name in self.env.get_agent_groups():
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all_brain_info[brain_name] = step_result_to_brain_info(
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self.env.get_step_result(brain_name),
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self.env.get_agent_group_spec(brain_name),
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)
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return all_brain_info
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