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87 行
3.4 KiB
87 行
3.4 KiB
from typing import Dict, Optional, Tuple, List
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from mlagents.torch_utils import torch
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import numpy as np
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from mlagents.trainers.buffer import AgentBuffer
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from mlagents.trainers.trajectory import ObsUtil
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from mlagents.trainers.torch.components.bc.module import BCModule
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from mlagents.trainers.torch.components.reward_providers import create_reward_provider
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from mlagents.trainers.policy.torch_policy import TorchPolicy
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from mlagents.trainers.optimizer import Optimizer
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from mlagents.trainers.settings import TrainerSettings
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from mlagents.trainers.torch.utils import ModelUtils
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class TorchOptimizer(Optimizer):
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def __init__(self, policy: TorchPolicy, trainer_settings: TrainerSettings):
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super().__init__()
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self.policy = policy
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self.trainer_settings = trainer_settings
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self.update_dict: Dict[str, torch.Tensor] = {}
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self.value_heads: Dict[str, torch.Tensor] = {}
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self.memory_in: torch.Tensor = None
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self.memory_out: torch.Tensor = None
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self.m_size: int = 0
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self.global_step = torch.tensor(0)
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self.bc_module: Optional[BCModule] = None
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self.create_reward_signals(trainer_settings.reward_signals)
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if trainer_settings.behavioral_cloning is not None:
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self.bc_module = BCModule(
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self.policy,
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trainer_settings.behavioral_cloning,
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policy_learning_rate=trainer_settings.hyperparameters.learning_rate,
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default_batch_size=trainer_settings.hyperparameters.batch_size,
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default_num_epoch=3,
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)
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@property
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def critic(self):
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raise NotImplementedError
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def update(self, batch: AgentBuffer, num_sequences: int) -> Dict[str, float]:
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pass
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def create_reward_signals(self, reward_signal_configs):
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"""
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Create reward signals
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:param reward_signal_configs: Reward signal config.
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"""
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for reward_signal, settings in reward_signal_configs.items():
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# Name reward signals by string in case we have duplicates later
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self.reward_signals[reward_signal.value] = create_reward_provider(
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reward_signal, self.policy.behavior_spec, settings
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)
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def get_trajectory_value_estimates(
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self, batch: AgentBuffer, next_obs: List[np.ndarray], done: bool
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) -> Tuple[Dict[str, np.ndarray], Dict[str, float]]:
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n_obs = len(self.policy.behavior_spec.observation_specs)
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current_obs = ObsUtil.from_buffer(batch, n_obs)
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# Convert to tensors
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current_obs = [ModelUtils.list_to_tensor(obs) for obs in current_obs]
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next_obs = [ModelUtils.list_to_tensor(obs) for obs in next_obs]
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memory = torch.zeros([1, 1, self.policy.m_size])
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next_obs = [obs.unsqueeze(0) for obs in next_obs]
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value_estimates, next_memory = self.critic.critic_pass(
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current_obs, memory, sequence_length=batch.num_experiences
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)
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next_value_estimate, _ = self.critic.critic_pass(
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next_obs, next_memory, sequence_length=1
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)
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for name, estimate in value_estimates.items():
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value_estimates[name] = ModelUtils.to_numpy(estimate)
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next_value_estimate[name] = ModelUtils.to_numpy(next_value_estimate[name])
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if done:
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for k in next_value_estimate:
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if not self.reward_signals[k].ignore_done:
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next_value_estimate[k] = 0.0
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return value_estimates, next_value_estimate
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