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313 行
11 KiB
313 行
11 KiB
from typing import List, NamedTuple
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import numpy as np
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from mlagents.trainers.buffer import (
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AgentBuffer,
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ObservationKeyPrefix,
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AgentBufferKey,
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BufferKey,
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)
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from mlagents_envs.base_env import ActionTuple
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from mlagents.trainers.torch.action_log_probs import LogProbsTuple
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class AgentStatus(NamedTuple):
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"""
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Stores observation, action, and reward for an agent. Does not have additional
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fields that are present in AgentExperience.
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"""
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obs: List[np.ndarray]
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reward: float
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action: ActionTuple
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done: bool
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class AgentExperience(NamedTuple):
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"""
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Stores the full amount of data for an agent in one timestep. Includes
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the status' of group mates and the group reward, as well as the probabilities
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outputted by the policy.
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"""
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obs: List[np.ndarray]
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reward: float
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done: bool
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action: ActionTuple
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action_probs: LogProbsTuple
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action_mask: np.ndarray
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prev_action: np.ndarray
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interrupted: bool
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memory: np.ndarray
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group_status: List[AgentStatus]
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group_reward: float
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class ObsUtil:
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@staticmethod
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def get_name_at(index: int) -> AgentBufferKey:
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"""
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returns the name of the observation given the index of the observation
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"""
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return ObservationKeyPrefix.OBSERVATION, index
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@staticmethod
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def get_name_at_next(index: int) -> AgentBufferKey:
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"""
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returns the name of the next observation given the index of the observation
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"""
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return ObservationKeyPrefix.NEXT_OBSERVATION, index
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@staticmethod
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def from_buffer(batch: AgentBuffer, num_obs: int) -> List[np.array]:
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"""
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Creates the list of observations from an AgentBuffer
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"""
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result: List[np.array] = []
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for i in range(num_obs):
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result.append(batch[ObsUtil.get_name_at(i)])
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return result
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@staticmethod
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def from_buffer_next(batch: AgentBuffer, num_obs: int) -> List[np.array]:
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"""
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Creates the list of next observations from an AgentBuffer
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"""
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result = []
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for i in range(num_obs):
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result.append(batch[ObsUtil.get_name_at_next(i)])
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return result
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class GroupObsUtil:
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@staticmethod
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def get_name_at(index: int) -> AgentBufferKey:
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"""
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returns the name of the observation given the index of the observation
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"""
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return ObservationKeyPrefix.GROUP_OBSERVATION, index
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@staticmethod
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def get_name_at_next(index: int) -> AgentBufferKey:
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"""
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returns the name of the next team observation given the index of the observation
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"""
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return ObservationKeyPrefix.NEXT_GROUP_OBSERVATION, index
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@staticmethod
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def _transpose_list_of_lists(
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list_list: List[List[np.ndarray]],
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) -> List[List[np.ndarray]]:
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return list(map(list, zip(*list_list)))
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@staticmethod
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def from_buffer(batch: AgentBuffer, num_obs: int) -> List[np.array]:
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"""
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Creates the list of observations from an AgentBuffer
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"""
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separated_obs: List[np.array] = []
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for i in range(num_obs):
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separated_obs.append(
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batch[GroupObsUtil.get_name_at(i)].padded_to_batch(pad_value=np.nan)
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)
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# separated_obs contains a List(num_obs) of Lists(num_agents), we want to flip
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# that and get a List(num_agents) of Lists(num_obs)
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result = GroupObsUtil._transpose_list_of_lists(separated_obs)
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return result
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@staticmethod
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def from_buffer_next(batch: AgentBuffer, num_obs: int) -> List[np.array]:
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"""
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Creates the list of observations from an AgentBuffer
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"""
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separated_obs: List[np.array] = []
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for i in range(num_obs):
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separated_obs.append(
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batch[GroupObsUtil.get_name_at_next(i)].padded_to_batch(
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pad_value=np.nan
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)
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)
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# separated_obs contains a List(num_obs) of Lists(num_agents), we want to flip
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# that and get a List(num_agents) of Lists(num_obs)
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result = GroupObsUtil._transpose_list_of_lists(separated_obs)
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return result
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class Trajectory(NamedTuple):
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steps: List[AgentExperience]
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next_obs: List[
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np.ndarray
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] # Observation following the trajectory, for bootstrapping
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next_group_obs: List[List[np.ndarray]]
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agent_id: str
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behavior_id: str
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def to_agentbuffer(self) -> AgentBuffer:
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"""
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Converts a Trajectory to an AgentBuffer
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:param trajectory: A Trajectory
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:returns: AgentBuffer. Note that the length of the AgentBuffer will be one
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less than the trajectory, as the next observation need to be populated from the last
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step of the trajectory.
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"""
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agent_buffer_trajectory = AgentBuffer()
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obs = self.steps[0].obs
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for step, exp in enumerate(self.steps):
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is_last_step = step == len(self.steps) - 1
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if not is_last_step:
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next_obs = self.steps[step + 1].obs
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else:
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next_obs = self.next_obs
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num_obs = len(obs)
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for i in range(num_obs):
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agent_buffer_trajectory[ObsUtil.get_name_at(i)].append(obs[i])
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agent_buffer_trajectory[ObsUtil.get_name_at_next(i)].append(next_obs[i])
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# Take care of teammate obs and actions
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teammate_continuous_actions, teammate_discrete_actions, teammate_rewards = (
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[],
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[],
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[],
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)
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for group_status in exp.group_status:
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teammate_rewards.append(group_status.reward)
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teammate_continuous_actions.append(group_status.action.continuous)
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teammate_discrete_actions.append(group_status.action.discrete)
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# Team actions
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agent_buffer_trajectory[BufferKey.GROUP_CONTINUOUS_ACTION].append(
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teammate_continuous_actions
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)
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agent_buffer_trajectory[BufferKey.GROUP_DISCRETE_ACTION].append(
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teammate_discrete_actions
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)
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agent_buffer_trajectory[BufferKey.GROUPMATE_REWARDS].append(
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teammate_rewards
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)
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agent_buffer_trajectory[BufferKey.GROUP_REWARD].append(exp.group_reward)
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# Next actions
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teammate_cont_next_actions = []
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teammate_disc_next_actions = []
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if not is_last_step:
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next_exp = self.steps[step + 1]
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for group_status in next_exp.group_status:
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teammate_cont_next_actions.append(group_status.action.continuous)
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teammate_disc_next_actions.append(group_status.action.discrete)
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else:
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for group_status in exp.group_status:
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teammate_cont_next_actions.append(group_status.action.continuous)
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teammate_disc_next_actions.append(group_status.action.discrete)
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agent_buffer_trajectory[BufferKey.GROUP_NEXT_CONT_ACTION].append(
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teammate_cont_next_actions
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)
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agent_buffer_trajectory[BufferKey.GROUP_NEXT_DISC_ACTION].append(
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teammate_disc_next_actions
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)
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for i in range(num_obs):
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ith_group_obs = []
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for _group_status in exp.group_status:
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# Assume teammates have same obs space
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ith_group_obs.append(_group_status.obs[i])
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agent_buffer_trajectory[GroupObsUtil.get_name_at(i)].append(
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ith_group_obs
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)
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ith_group_obs_next = []
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if is_last_step:
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for _obs in self.next_group_obs:
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ith_group_obs_next.append(_obs[i])
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else:
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next_group_status = self.steps[step + 1].group_status
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for _group_status in next_group_status:
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# Assume teammates have same obs space
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ith_group_obs_next.append(_group_status.obs[i])
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agent_buffer_trajectory[GroupObsUtil.get_name_at_next(i)].append(
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ith_group_obs_next
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)
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if exp.memory is not None:
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agent_buffer_trajectory[BufferKey.MEMORY].append(exp.memory)
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agent_buffer_trajectory[BufferKey.MASKS].append(1.0)
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agent_buffer_trajectory[BufferKey.DONE].append(exp.done)
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agent_buffer_trajectory[BufferKey.GROUP_DONES].append(
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[_status.done for _status in exp.group_status]
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)
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# Adds the log prob and action of continuous/discrete separately
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agent_buffer_trajectory[BufferKey.CONTINUOUS_ACTION].append(
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exp.action.continuous
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)
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agent_buffer_trajectory[BufferKey.DISCRETE_ACTION].append(
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exp.action.discrete
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)
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cont_next_actions = np.zeros_like(exp.action.continuous)
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disc_next_actions = np.zeros_like(exp.action.discrete)
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if not is_last_step:
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next_action = self.steps[step + 1].action
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cont_next_actions = next_action.continuous
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disc_next_actions = next_action.discrete
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agent_buffer_trajectory[BufferKey.NEXT_CONT_ACTION].append(
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cont_next_actions
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)
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agent_buffer_trajectory[BufferKey.NEXT_DISC_ACTION].append(
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disc_next_actions
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)
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agent_buffer_trajectory[BufferKey.CONTINUOUS_LOG_PROBS].append(
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exp.action_probs.continuous
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)
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agent_buffer_trajectory[BufferKey.DISCRETE_LOG_PROBS].append(
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exp.action_probs.discrete
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)
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# Store action masks if necessary. Note that 1 means active, while
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# in AgentExperience False means active.
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if exp.action_mask is not None:
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mask = 1 - np.concatenate(exp.action_mask)
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agent_buffer_trajectory[BufferKey.ACTION_MASK].append(
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mask, padding_value=1
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)
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else:
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# This should never be needed unless the environment somehow doesn't supply the
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# action mask in a discrete space.
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action_shape = exp.action.discrete.shape
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agent_buffer_trajectory[BufferKey.ACTION_MASK].append(
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np.ones(action_shape, dtype=np.float32), padding_value=1
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)
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agent_buffer_trajectory[BufferKey.PREV_ACTION].append(exp.prev_action)
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agent_buffer_trajectory[BufferKey.ENVIRONMENT_REWARDS].append(exp.reward)
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# Store the next visual obs as the current
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obs = next_obs
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return agent_buffer_trajectory
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@property
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def done_reached(self) -> bool:
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"""
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Returns true if trajectory is terminated with a Done.
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"""
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return self.steps[-1].done
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@property
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def teammate_dones_reached(self) -> bool:
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"""
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Returns true if all teammates are done at the end of the trajectory.
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Combine with done_reached to check if the whole team is done.
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"""
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return all(_status.done for _status in self.steps[-1].group_status)
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@property
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def interrupted(self) -> bool:
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"""
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Returns true if trajectory was terminated because max steps was reached.
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"""
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return self.steps[-1].interrupted
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