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224 行
8.7 KiB
224 行
8.7 KiB
import os
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from typing import List, Tuple
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import numpy as np
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from mlagents.trainers.buffer import AgentBuffer
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from mlagents_envs.communicator_objects.agent_info_action_pair_pb2 import (
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AgentInfoActionPairProto,
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)
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from mlagents.trainers.trajectory import SplitObservations
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from mlagents_envs.rpc_utils import behavior_spec_from_proto, steps_from_proto
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from mlagents_envs.base_env import BehaviorSpec
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from mlagents_envs.communicator_objects.brain_parameters_pb2 import BrainParametersProto
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from mlagents_envs.communicator_objects.demonstration_meta_pb2 import (
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DemonstrationMetaProto,
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)
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from mlagents_envs.timers import timed, hierarchical_timer
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from google.protobuf.internal.decoder import _DecodeVarint32 # type: ignore
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from google.protobuf.internal.encoder import _EncodeVarint # type: ignore
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INITIAL_POS = 33
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SUPPORTED_DEMONSTRATION_VERSIONS = frozenset([0, 1])
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@timed
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def make_demo_buffer(
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pair_infos: List[AgentInfoActionPairProto],
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behavior_spec: BehaviorSpec,
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sequence_length: int,
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) -> AgentBuffer:
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# Create and populate buffer using experiences
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demo_raw_buffer = AgentBuffer()
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demo_processed_buffer = AgentBuffer()
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for idx, current_pair_info in enumerate(pair_infos):
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if idx > len(pair_infos) - 2:
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break
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next_pair_info = pair_infos[idx + 1]
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current_decision_step, current_terminal_step = steps_from_proto(
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[current_pair_info.agent_info], behavior_spec
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)
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next_decision_step, next_terminal_step = steps_from_proto(
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[next_pair_info.agent_info], behavior_spec
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)
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previous_action = (
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np.array(pair_infos[idx].action_info.vector_actions, dtype=np.float32) * 0
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)
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if idx > 0:
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previous_action = np.array(
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pair_infos[idx - 1].action_info.vector_actions, dtype=np.float32
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)
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next_done = len(next_terminal_step) == 1
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next_reward = 0
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if len(next_terminal_step) == 1:
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next_reward = next_terminal_step.reward[0]
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else:
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next_reward = next_decision_step.reward[0]
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current_obs = None
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if len(current_terminal_step) == 1:
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current_obs = list(current_terminal_step.values())[0].obs
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else:
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current_obs = list(current_decision_step.values())[0].obs
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demo_raw_buffer["done"].append(next_done)
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demo_raw_buffer["rewards"].append(next_reward)
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split_obs = SplitObservations.from_observations(current_obs)
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for i, obs in enumerate(split_obs.visual_observations):
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demo_raw_buffer["visual_obs%d" % i].append(obs)
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demo_raw_buffer["vector_obs"].append(split_obs.vector_observations)
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demo_raw_buffer["actions"].append(current_pair_info.action_info.vector_actions)
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demo_raw_buffer["prev_action"].append(previous_action)
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if next_done:
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demo_raw_buffer.resequence_and_append(
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demo_processed_buffer, batch_size=None, training_length=sequence_length
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)
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demo_raw_buffer.reset_agent()
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demo_raw_buffer.resequence_and_append(
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demo_processed_buffer, batch_size=None, training_length=sequence_length
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)
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return demo_processed_buffer
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@timed
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def demo_to_buffer(
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file_path: str, sequence_length: int, expected_behavior_spec: BehaviorSpec = None
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) -> Tuple[BehaviorSpec, AgentBuffer]:
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"""
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Loads demonstration file and uses it to fill training buffer.
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:param file_path: Location of demonstration file (.demo).
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:param sequence_length: Length of trajectories to fill buffer.
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:return:
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"""
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behavior_spec, info_action_pair, _ = load_demonstration(file_path)
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demo_buffer = make_demo_buffer(info_action_pair, behavior_spec, sequence_length)
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if expected_behavior_spec:
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# check action dimensions in demonstration match
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if behavior_spec.action_spec != expected_behavior_spec.action_spec:
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raise RuntimeError(
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"The action spaces {} in demonstration do not match the policy's {}.".format(
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behavior_spec.action_spec, expected_behavior_spec.action_spec
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)
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)
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# check observations match
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if len(behavior_spec.observation_shapes) != len(
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expected_behavior_spec.observation_shapes
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):
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raise RuntimeError(
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"The demonstrations do not have the same number of observations as the policy."
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)
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else:
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for i, (demo_obs, policy_obs) in enumerate(
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zip(
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behavior_spec.observation_shapes,
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expected_behavior_spec.observation_shapes,
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)
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):
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if demo_obs != policy_obs:
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raise RuntimeError(
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f"The shape {demo_obs} for observation {i} in demonstration \
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do not match the policy's {policy_obs}."
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)
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return behavior_spec, demo_buffer
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def get_demo_files(path: str) -> List[str]:
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"""
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Retrieves the demonstration file(s) from a path.
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:param path: Path of demonstration file or directory.
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:return: List of demonstration files
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Raises errors if |path| is invalid.
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"""
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if os.path.isfile(path):
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if not path.endswith(".demo"):
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raise ValueError("The path provided is not a '.demo' file.")
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return [path]
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elif os.path.isdir(path):
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paths = [
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os.path.join(path, name)
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for name in os.listdir(path)
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if name.endswith(".demo")
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]
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if not paths:
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raise ValueError("There are no '.demo' files in the provided directory.")
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return paths
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else:
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raise FileNotFoundError(
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f"The demonstration file or directory {path} does not exist."
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)
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@timed
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def load_demonstration(
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file_path: str,
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) -> Tuple[BehaviorSpec, List[AgentInfoActionPairProto], int]:
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"""
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Loads and parses a demonstration file.
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:param file_path: Location of demonstration file (.demo).
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:return: BrainParameter and list of AgentInfoActionPairProto containing demonstration data.
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"""
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# First 32 bytes of file dedicated to meta-data.
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file_paths = get_demo_files(file_path)
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behavior_spec = None
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brain_param_proto = None
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info_action_pairs = []
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total_expected = 0
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for _file_path in file_paths:
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with open(_file_path, "rb") as fp:
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with hierarchical_timer("read_file"):
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data = fp.read()
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next_pos, pos, obs_decoded = 0, 0, 0
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while pos < len(data):
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next_pos, pos = _DecodeVarint32(data, pos)
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if obs_decoded == 0:
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meta_data_proto = DemonstrationMetaProto()
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meta_data_proto.ParseFromString(data[pos : pos + next_pos])
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if (
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meta_data_proto.api_version
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not in SUPPORTED_DEMONSTRATION_VERSIONS
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):
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raise RuntimeError(
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f"Can't load Demonstration data from an unsupported version ({meta_data_proto.api_version})"
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)
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total_expected += meta_data_proto.number_steps
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pos = INITIAL_POS
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if obs_decoded == 1:
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brain_param_proto = BrainParametersProto()
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brain_param_proto.ParseFromString(data[pos : pos + next_pos])
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pos += next_pos
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if obs_decoded > 1:
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agent_info_action = AgentInfoActionPairProto()
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agent_info_action.ParseFromString(data[pos : pos + next_pos])
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if behavior_spec is None:
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behavior_spec = behavior_spec_from_proto(
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brain_param_proto, agent_info_action.agent_info
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)
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info_action_pairs.append(agent_info_action)
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if len(info_action_pairs) == total_expected:
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break
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pos += next_pos
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obs_decoded += 1
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if not behavior_spec:
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raise RuntimeError(
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f"No BrainParameters found in demonstration file at {file_path}."
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)
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return behavior_spec, info_action_pairs, total_expected
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def write_delimited(f, message):
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msg_string = message.SerializeToString()
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msg_size = len(msg_string)
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_EncodeVarint(f.write, msg_size)
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f.write(msg_string)
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def write_demo(demo_path, meta_data_proto, brain_param_proto, agent_info_protos):
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with open(demo_path, "wb") as f:
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# write metadata
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write_delimited(f, meta_data_proto)
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f.seek(INITIAL_POS)
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write_delimited(f, brain_param_proto)
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for agent in agent_info_protos:
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write_delimited(f, agent)
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