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392 行
15 KiB
392 行
15 KiB
import logging
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from typing import Any, Dict, List, Optional
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import numpy as np
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from mlagents.tf_utils import tf
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from mlagents.envs.exception import UnityException
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from mlagents.trainers.policy import Policy
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from mlagents.trainers.action_info import ActionInfo
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from tensorflow.python.platform import gfile
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from tensorflow.python.framework import graph_util
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from mlagents.trainers import tensorflow_to_barracuda as tf2bc
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from mlagents.trainers.trajectory import SplitObservations
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from mlagents.trainers.buffer import AgentBuffer
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from mlagents.trainers.brain import BrainInfo
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logger = logging.getLogger("mlagents.trainers")
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class UnityPolicyException(UnityException):
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"""
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Related to errors with the Trainer.
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"""
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pass
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class TFPolicy(Policy):
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"""
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Contains a learning model, and the necessary
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functions to interact with it to perform evaluate and updating.
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"""
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possible_output_nodes = [
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"action",
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"value_estimate",
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"action_probs",
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"recurrent_out",
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"memory_size",
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"version_number",
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"is_continuous_control",
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"action_output_shape",
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]
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def __init__(self, seed, brain, trainer_parameters):
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"""
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Initialized the policy.
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:param seed: Random seed to use for TensorFlow.
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:param brain: The corresponding Brain for this policy.
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:param trainer_parameters: The trainer parameters.
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"""
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self.m_size = None
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self.model = None
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self.inference_dict = {}
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self.update_dict = {}
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self.sequence_length = 1
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self.seed = seed
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self.brain = brain
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self.use_recurrent = trainer_parameters["use_recurrent"]
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self.memory_dict: Dict[str, np.ndarray] = {}
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self.reward_signals: Dict[str, "RewardSignal"] = {}
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self.num_branches = len(self.brain.vector_action_space_size)
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self.previous_action_dict: Dict[str, np.array] = {}
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self.normalize = trainer_parameters.get("normalize", False)
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self.use_continuous_act = brain.vector_action_space_type == "continuous"
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if self.use_continuous_act:
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self.num_branches = self.brain.vector_action_space_size[0]
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self.model_path = trainer_parameters["model_path"]
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self.keep_checkpoints = trainer_parameters.get("keep_checkpoints", 5)
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self.graph = tf.Graph()
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config = tf.ConfigProto()
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config.gpu_options.allow_growth = True
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# For multi-GPU training, set allow_soft_placement to True to allow
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# placing the operation into an alternative device automatically
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# to prevent from exceptions if the device doesn't suppport the operation
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# or the device does not exist
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config.allow_soft_placement = True
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self.sess = tf.Session(config=config, graph=self.graph)
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self.saver = None
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if self.use_recurrent:
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self.m_size = trainer_parameters["memory_size"]
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self.sequence_length = trainer_parameters["sequence_length"]
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if self.m_size == 0:
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raise UnityPolicyException(
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"The memory size for brain {0} is 0 even "
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"though the trainer uses recurrent.".format(brain.brain_name)
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)
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elif self.m_size % 4 != 0:
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raise UnityPolicyException(
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"The memory size for brain {0} is {1} "
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"but it must be divisible by 4.".format(
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brain.brain_name, self.m_size
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)
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)
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def _initialize_graph(self):
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with self.graph.as_default():
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self.saver = tf.train.Saver(max_to_keep=self.keep_checkpoints)
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init = tf.global_variables_initializer()
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self.sess.run(init)
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def _load_graph(self):
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with self.graph.as_default():
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self.saver = tf.train.Saver(max_to_keep=self.keep_checkpoints)
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logger.info("Loading Model for brain {}".format(self.brain.brain_name))
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ckpt = tf.train.get_checkpoint_state(self.model_path)
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if ckpt is None:
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logger.info(
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"The model {0} could not be found. Make "
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"sure you specified the right "
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"--run-id".format(self.model_path)
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)
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self.saver.restore(self.sess, ckpt.model_checkpoint_path)
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def evaluate(self, brain_info: BrainInfo) -> Dict[str, Any]:
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"""
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Evaluates policy for the agent experiences provided.
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:param brain_info: BrainInfo input to network.
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:return: Output from policy based on self.inference_dict.
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"""
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raise UnityPolicyException("The evaluate function was not implemented.")
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def get_action(self, brain_info: BrainInfo) -> ActionInfo:
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"""
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Decides actions given observations information, and takes them in environment.
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:param brain_info: A dictionary of brain names and BrainInfo from environment.
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:return: an ActionInfo containing action, memories, values and an object
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to be passed to add experiences
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"""
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if len(brain_info.agents) == 0:
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return ActionInfo([], [], {})
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agents_done = [
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agent
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for agent, done in zip(brain_info.agents, brain_info.local_done)
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if done
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]
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self.remove_memories(agents_done)
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self.remove_previous_action(agents_done)
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run_out = self.evaluate(brain_info) # pylint: disable=assignment-from-no-return
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self.save_memories(brain_info.agents, run_out.get("memory_out"))
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return ActionInfo(
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action=run_out.get("action"), value=run_out.get("value"), outputs=run_out
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)
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def update(self, mini_batch, num_sequences):
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"""
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Performs update of the policy.
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:param num_sequences: Number of experience trajectories in batch.
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:param mini_batch: Batch of experiences.
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:return: Results of update.
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"""
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raise UnityPolicyException("The update function was not implemented.")
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def _execute_model(self, feed_dict, out_dict):
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"""
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Executes model.
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:param feed_dict: Input dictionary mapping nodes to input data.
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:param out_dict: Output dictionary mapping names to nodes.
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:return: Dictionary mapping names to input data.
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"""
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network_out = self.sess.run(list(out_dict.values()), feed_dict=feed_dict)
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run_out = dict(zip(list(out_dict.keys()), network_out))
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return run_out
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def fill_eval_dict(self, feed_dict, brain_info):
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for i, _ in enumerate(brain_info.visual_observations):
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feed_dict[self.model.visual_in[i]] = brain_info.visual_observations[i]
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if self.use_vec_obs:
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feed_dict[self.model.vector_in] = brain_info.vector_observations
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if not self.use_continuous_act:
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feed_dict[self.model.action_masks] = brain_info.action_masks
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return feed_dict
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def make_empty_memory(self, num_agents):
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"""
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Creates empty memory for use with RNNs
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:param num_agents: Number of agents.
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:return: Numpy array of zeros.
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"""
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return np.zeros((num_agents, self.m_size), dtype=np.float32)
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def save_memories(
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self, agent_ids: List[str], memory_matrix: Optional[np.ndarray]
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) -> None:
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if memory_matrix is None:
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return
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for index, agent_id in enumerate(agent_ids):
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self.memory_dict[agent_id] = memory_matrix[index, :]
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def retrieve_memories(self, agent_ids: List[str]) -> np.ndarray:
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memory_matrix = np.zeros((len(agent_ids), self.m_size), dtype=np.float32)
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for index, agent_id in enumerate(agent_ids):
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if agent_id in self.memory_dict:
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memory_matrix[index, :] = self.memory_dict[agent_id]
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return memory_matrix
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def remove_memories(self, agent_ids):
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for agent_id in agent_ids:
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if agent_id in self.memory_dict:
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self.memory_dict.pop(agent_id)
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def make_empty_previous_action(self, num_agents):
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"""
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Creates empty previous action for use with RNNs and discrete control
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:param num_agents: Number of agents.
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:return: Numpy array of zeros.
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"""
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return np.zeros((num_agents, self.num_branches), dtype=np.int)
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def save_previous_action(
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self, agent_ids: List[str], action_matrix: Optional[np.ndarray]
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) -> None:
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if action_matrix is None:
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return
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for index, agent_id in enumerate(agent_ids):
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self.previous_action_dict[agent_id] = action_matrix[index, :]
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def retrieve_previous_action(self, agent_ids: List[str]) -> np.ndarray:
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action_matrix = np.zeros((len(agent_ids), self.num_branches), dtype=np.int)
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for index, agent_id in enumerate(agent_ids):
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if agent_id in self.previous_action_dict:
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action_matrix[index, :] = self.previous_action_dict[agent_id]
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return action_matrix
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def remove_previous_action(self, agent_ids):
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for agent_id in agent_ids:
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if agent_id in self.previous_action_dict:
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self.previous_action_dict.pop(agent_id)
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def get_current_step(self):
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"""
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Gets current model step.
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:return: current model step.
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"""
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step = self.sess.run(self.model.global_step)
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return step
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def increment_step(self, n_steps):
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"""
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Increments model step.
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"""
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out_dict = {
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"global_step": self.model.global_step,
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"increment_step": self.model.increment_step,
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}
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feed_dict = {self.model.steps_to_increment: n_steps}
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return self.sess.run(out_dict, feed_dict=feed_dict)["global_step"]
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def get_inference_vars(self):
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"""
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:return:list of inference var names
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"""
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return list(self.inference_dict.keys())
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def get_update_vars(self):
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"""
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:return:list of update var names
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"""
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return list(self.update_dict.keys())
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def save_model(self, steps):
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"""
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Saves the model
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:param steps: The number of steps the model was trained for
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:return:
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"""
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with self.graph.as_default():
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last_checkpoint = self.model_path + "/model-" + str(steps) + ".cptk"
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self.saver.save(self.sess, last_checkpoint)
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tf.train.write_graph(
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self.graph, self.model_path, "raw_graph_def.pb", as_text=False
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)
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def export_model(self):
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"""
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Exports latest saved model to .nn format for Unity embedding.
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"""
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with self.graph.as_default():
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target_nodes = ",".join(self._process_graph())
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graph_def = self.graph.as_graph_def()
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output_graph_def = graph_util.convert_variables_to_constants(
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self.sess, graph_def, target_nodes.replace(" ", "").split(",")
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)
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frozen_graph_def_path = self.model_path + "/frozen_graph_def.pb"
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with gfile.GFile(frozen_graph_def_path, "wb") as f:
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f.write(output_graph_def.SerializeToString())
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tf2bc.convert(frozen_graph_def_path, self.model_path + ".nn")
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logger.info("Exported " + self.model_path + ".nn file")
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def _process_graph(self):
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"""
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Gets the list of the output nodes present in the graph for inference
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:return: list of node names
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"""
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all_nodes = [x.name for x in self.graph.as_graph_def().node]
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nodes = [x for x in all_nodes if x in self.possible_output_nodes]
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logger.info("List of nodes to export for brain :" + self.brain.brain_name)
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for n in nodes:
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logger.info("\t" + n)
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return nodes
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def update_normalization(self, vector_obs: np.ndarray) -> None:
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"""
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If this policy normalizes vector observations, this will update the norm values in the graph.
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:param vector_obs: The vector observations to add to the running estimate of the distribution.
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"""
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if self.use_vec_obs and self.normalize:
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self.sess.run(
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self.model.update_normalization,
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feed_dict={self.model.vector_in: vector_obs},
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)
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def get_batched_value_estimates(self, batch: AgentBuffer) -> Dict[str, np.ndarray]:
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feed_dict: Dict[tf.Tensor, Any] = {
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self.model.batch_size: batch.num_experiences,
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self.model.sequence_length: 1, # We want to feed data in batch-wise, not time-wise.
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}
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if self.use_vec_obs:
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feed_dict[self.model.vector_in] = batch["vector_obs"]
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if self.model.vis_obs_size > 0:
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for i in range(len(self.model.visual_in)):
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_obs = batch["visual_obs%d" % i]
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feed_dict[self.model.visual_in[i]] = _obs
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if self.use_recurrent:
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feed_dict[self.model.memory_in] = batch["memory"]
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if not self.use_continuous_act and self.use_recurrent:
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feed_dict[self.model.prev_action] = batch["prev_action"]
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value_estimates = self.sess.run(self.model.value_heads, feed_dict)
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value_estimates = {k: np.squeeze(v, axis=1) for k, v in value_estimates.items()}
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return value_estimates
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def get_value_estimates(
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self, next_obs: List[np.ndarray], agent_id: str, done: bool
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) -> Dict[str, float]:
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"""
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Generates value estimates for bootstrapping.
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:param experience: AgentExperience to be used for bootstrapping.
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:param done: Whether or not this is the last element of the episode, in which case the value estimate will be 0.
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:return: The value estimate dictionary with key being the name of the reward signal and the value the
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corresponding value estimate.
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"""
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feed_dict: Dict[tf.Tensor, Any] = {
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self.model.batch_size: 1,
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self.model.sequence_length: 1,
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}
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vec_vis_obs = SplitObservations.from_observations(next_obs)
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for i in range(len(vec_vis_obs.visual_observations)):
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feed_dict[self.model.visual_in[i]] = [vec_vis_obs.visual_observations[i]]
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if self.use_vec_obs:
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feed_dict[self.model.vector_in] = [vec_vis_obs.vector_observations]
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if self.use_recurrent:
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feed_dict[self.model.memory_in] = self.retrieve_memories([agent_id])
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if not self.use_continuous_act and self.use_recurrent:
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feed_dict[self.model.prev_action] = self.retrieve_previous_action(
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[agent_id]
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)
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value_estimates = self.sess.run(self.model.value_heads, feed_dict)
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value_estimates = {k: float(v) for k, v in value_estimates.items()}
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# If we're done, reassign all of the value estimates that need terminal states.
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if done:
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for k in value_estimates:
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if self.reward_signals[k].use_terminal_states:
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value_estimates[k] = 0.0
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return value_estimates
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@property
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def vis_obs_size(self):
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return self.model.vis_obs_size
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@property
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def vec_obs_size(self):
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return self.model.vec_obs_size
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@property
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def use_vis_obs(self):
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return self.model.vis_obs_size > 0
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@property
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def use_vec_obs(self):
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return self.model.vec_obs_size > 0
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