from typing import Union, Optional, List, Any, Tuple import os import copy import torch from ditk import logging from functools import partial from tensorboardX import SummaryWriter from copy import deepcopy from ding.envs import get_vec_env_setting, create_env_manager from ding.worker import BaseLearner, InteractionSerialEvaluator, BaseSerialCommander, create_buffer, \ create_serial_collector from ding.config import read_config, compile_config from ding.policy import create_policy from ding.reward_model import create_reward_model from ding.utils import set_pkg_seed, save_file from .utils import random_collect def serial_pipeline_guided_cost( input_cfg: Union[str, Tuple[dict, dict]], seed: int = 0, env_setting: Optional[List[Any]] = None, model: Optional[torch.nn.Module] = None, expert_model: Optional[torch.nn.Module] = None, max_train_iter: Optional[int] = int(1e10), max_env_step: Optional[int] = int(1e10), ) -> 'Policy': # noqa """ Overview: Serial pipeline guided cost: we create this serial pipeline in order to\ implement guided cost learning in DI-engine. For now, we support the following envs\ Cartpole, Lunarlander, Hopper, Halfcheetah, Walker2d. The demonstration\ data come from the expert model. We use a well-trained model to \ generate demonstration data online Arguments: - input_cfg (:obj:`Union[str, Tuple[dict, dict]]`): Config in dict type. \ ``str`` type means config file path. \ ``Tuple[dict, dict]`` type means [user_config, create_cfg]. - seed (:obj:`int`): Random seed. - env_setting (:obj:`Optional[List[Any]]`): A list with 3 elements: \ ``BaseEnv`` subclass, collector env config, and evaluator env config. - model (:obj:`Optional[torch.nn.Module]`): Instance of torch.nn.Module. - expert_model (:obj:`Optional[torch.nn.Module]`): Instance of torch.nn.Module.\ The default model is DQN(**cfg.policy.model) - max_train_iter (:obj:`Optional[int]`): Maximum policy update iterations in training. - max_env_step (:obj:`Optional[int]`): Maximum collected environment interaction steps. Returns: - policy (:obj:`Policy`): Converged policy. """ if isinstance(input_cfg, str): cfg, create_cfg = read_config(input_cfg) else: cfg, create_cfg = deepcopy(input_cfg) create_cfg.policy.type = create_cfg.policy.type + '_command' env_fn = None if env_setting is None else env_setting[0] cfg = compile_config(cfg, seed=seed, env=env_fn, auto=True, create_cfg=create_cfg, save_cfg=True) # Create main components: env, policy if env_setting is None: env_fn, collector_env_cfg, evaluator_env_cfg = get_vec_env_setting(cfg.env) else: env_fn, collector_env_cfg, evaluator_env_cfg = env_setting collector_env = create_env_manager(cfg.env.manager, [partial(env_fn, cfg=c) for c in collector_env_cfg]) expert_collector_env = create_env_manager(cfg.env.manager, [partial(env_fn, cfg=c) for c in collector_env_cfg]) evaluator_env = create_env_manager(cfg.env.manager, [partial(env_fn, cfg=c) for c in evaluator_env_cfg]) expert_collector_env.seed(cfg.seed) collector_env.seed(cfg.seed) evaluator_env.seed(cfg.seed, dynamic_seed=False) expert_policy = create_policy(cfg.policy, model=expert_model, enable_field=['learn', 'collect']) set_pkg_seed(cfg.seed, use_cuda=cfg.policy.cuda) policy = create_policy(cfg.policy, model=model, enable_field=['learn', 'collect', 'eval', 'command']) expert_policy.collect_mode.load_state_dict(torch.load(cfg.policy.collect.model_path, map_location='cpu')) # Create worker components: learner, collector, evaluator, replay buffer, commander. tb_logger = SummaryWriter(os.path.join('./{}/log/'.format(cfg.exp_name), 'serial')) learner = BaseLearner(cfg.policy.learn.learner, policy.learn_mode, tb_logger, exp_name=cfg.exp_name) collector = create_serial_collector( cfg.policy.collect.collector, env=collector_env, policy=policy.collect_mode, tb_logger=tb_logger, exp_name=cfg.exp_name ) expert_collector = create_serial_collector( cfg.policy.collect.collector, env=expert_collector_env, policy=expert_policy.collect_mode, tb_logger=tb_logger, exp_name=cfg.exp_name ) evaluator = InteractionSerialEvaluator( cfg.policy.eval.evaluator, evaluator_env, policy.eval_mode, tb_logger, exp_name=cfg.exp_name ) replay_buffer = create_buffer(cfg.policy.other.replay_buffer, tb_logger=tb_logger, exp_name=cfg.exp_name) expert_buffer = create_buffer(cfg.policy.other.replay_buffer, tb_logger=tb_logger, exp_name=cfg.exp_name) commander = BaseSerialCommander( cfg.policy.other.commander, learner, collector, evaluator, replay_buffer, policy.command_mode ) reward_model = create_reward_model(cfg.reward_model, policy.collect_mode.get_attribute('device'), tb_logger) # ========== # Main loop # ========== # Learner's before_run hook. learner.call_hook('before_run') # Accumulate plenty of data at the beginning of training. if cfg.policy.get('random_collect_size', 0) > 0: random_collect(cfg.policy, policy, collector, collector_env, commander, replay_buffer) dirname = cfg.exp_name + '/reward_model' if not os.path.exists(dirname): try: os.makedirs(dirname) except FileExistsError: pass while True: collect_kwargs = commander.step() # Evaluate policy performance if evaluator.should_eval(learner.train_iter): stop, reward = evaluator.eval(learner.save_checkpoint, learner.train_iter, collector.envstep) if stop: break # Collect data by default config n_sample/n_episode new_data = collector.collect(train_iter=learner.train_iter, policy_kwargs=collect_kwargs) # NOTE: deepcopy data is very important, # otherwise the data in the replay buffer will be incorrectly modified. # NOTE: this line cannot move to line130, because in line134 the data may be modified in-place. train_data = copy.deepcopy(new_data) expert_data = expert_collector.collect(train_iter=learner.train_iter, policy_kwargs=collect_kwargs) replay_buffer.push(new_data, cur_collector_envstep=collector.envstep) expert_buffer.push(expert_data, cur_collector_envstep=expert_collector.envstep) # Learn policy from collected data for i in range(cfg.reward_model.update_per_collect): expert_demo = expert_buffer.sample(cfg.reward_model.batch_size, learner.train_iter) samp = replay_buffer.sample(cfg.reward_model.batch_size, learner.train_iter) reward_model.train(expert_demo, samp, learner.train_iter, collector.envstep) for i in range(cfg.policy.learn.update_per_collect): # Learner will train ``update_per_collect`` times in one iteration. _ = reward_model.estimate(train_data) if train_data is None: # It is possible that replay buffer's data count is too few to train ``update_per_collect`` times logging.warning( "Replay buffer's data can only train for {} steps. ".format(i) + "You can modify data collect config, e.g. increasing n_sample, n_episode." ) break learner.train(train_data, collector.envstep) if learner.policy.get_attribute('priority'): replay_buffer.update(learner.priority_info) if collector.envstep >= max_env_step or learner.train_iter >= max_train_iter: break # save reward model if learner.train_iter % cfg.reward_model.store_model_every_n_train == 0: #if learner.train_iter%5000 == 0: path = os.path.join(dirname, 'iteration_{}.pth.tar'.format(learner.train_iter)) state_dict = reward_model.state_dict_reward_model() save_file(path, state_dict) path = os.path.join(dirname, 'final_model.pth.tar') state_dict = reward_model.state_dict_reward_model() save_file(path, state_dict) # Learner's after_run hook. learner.call_hook('after_run') return policy