import numpy as np import torch import argparse import os import gym import time import json import dmc2gym import tqdm import wandb import utils from utils import ReplayBuffer, make_env, save_image from models import ObservationEncoder, ObservationDecoder, TransitionModel, CLUBSample from logger import Logger from video import VideoRecorder from dmc2gym.wrappers import set_global_var #from agent.baseline_agent import BaselineAgent #from agent.bisim_agent import BisimAgent #from agent.deepmdp_agent import DeepMDPAgent #from agents.navigation.carla_env import CarlaEnv def parse_args(): parser = argparse.ArgumentParser() # environment parser.add_argument('--domain_name', default='cheetah') parser.add_argument('--task_name', default='run') parser.add_argument('--image_size', default=84, type=int) parser.add_argument('--channels', default=3, type=int) parser.add_argument('--action_repeat', default=1, type=int) parser.add_argument('--frame_stack', default=4, type=int) parser.add_argument('--resource_files', type=str) parser.add_argument('--eval_resource_files', type=str) parser.add_argument('--img_source', default=None, type=str, choices=['color', 'noise', 'images', 'video', 'none']) parser.add_argument('--total_frames', default=1000, type=int) # 10000 parser.add_argument('--high_noise', action='store_true') # replay buffer parser.add_argument('--replay_buffer_capacity', default=50000, type=int) #50000 parser.add_argument('--episode_length', default=50, type=int) # train parser.add_argument('--agent', default='dpi', type=str, choices=['baseline', 'bisim', 'deepmdp', 'db', 'dpi', 'rpc']) parser.add_argument('--init_steps', default=1000, type=int) parser.add_argument('--num_train_steps', default=1000, type=int) parser.add_argument('--batch_size', default=200, type=int) #512 parser.add_argument('--state_size', default=256, type=int) parser.add_argument('--hidden_size', default=128, type=int) parser.add_argument('--history_size', default=128, type=int) parser.add_argument('--load_encoder', default=None, type=str) parser.add_argument('--imagination_horizon', default=15, type=str) # eval parser.add_argument('--eval_freq', default=10, type=int) # TODO: master had 10000 parser.add_argument('--num_eval_episodes', default=20, type=int) # critic parser.add_argument('--critic_lr', default=1e-3, type=float) parser.add_argument('--critic_beta', default=0.9, type=float) parser.add_argument('--critic_tau', default=0.005, type=float) parser.add_argument('--critic_target_update_freq', default=2, type=int) # actor parser.add_argument('--actor_lr', default=1e-3, type=float) parser.add_argument('--actor_beta', default=0.9, type=float) parser.add_argument('--actor_log_std_min', default=-10, type=float) parser.add_argument('--actor_log_std_max', default=2, type=float) parser.add_argument('--actor_update_freq', default=2, type=int) # encoder/decoder parser.add_argument('--encoder_type', default='pixel', type=str, choices=['pixel', 'pixelCarla096', 'pixelCarla098', 'identity']) parser.add_argument('--encoder_feature_dim', default=50, type=int) parser.add_argument('--encoder_lr', default=1e-3, type=float) parser.add_argument('--encoder_tau', default=0.005, type=float) parser.add_argument('--encoder_stride', default=1, type=int) parser.add_argument('--decoder_type', default='pixel', type=str, choices=['pixel', 'identity', 'contrastive', 'reward', 'inverse', 'reconstruction']) parser.add_argument('--decoder_lr', default=1e-3, type=float) parser.add_argument('--decoder_update_freq', default=1, type=int) parser.add_argument('--decoder_weight_lambda', default=0.0, type=float) parser.add_argument('--num_layers', default=4, type=int) parser.add_argument('--num_filters', default=32, type=int) # sac parser.add_argument('--discount', default=0.99, type=float) parser.add_argument('--init_temperature', default=0.01, type=float) parser.add_argument('--alpha_lr', default=1e-3, type=float) parser.add_argument('--alpha_beta', default=0.9, type=float) # misc parser.add_argument('--seed', default=1, type=int) parser.add_argument('--work_dir', default='.', type=str) parser.add_argument('--save_tb', default=False, action='store_true') parser.add_argument('--save_model', default=False, action='store_true') parser.add_argument('--save_buffer', default=False, action='store_true') parser.add_argument('--save_video', default=False, action='store_true') parser.add_argument('--transition_model_type', default='', type=str, choices=['', 'deterministic', 'probabilistic', 'ensemble']) parser.add_argument('--render', default=False, action='store_true') parser.add_argument('--port', default=2000, type=int) args = parser.parse_args() return args class DPI: def __init__(self, args): # wandb config #run = wandb.init(project="dpi") self.args = args # set environment noise set_global_var(self.args.high_noise) # environment setup self.env = make_env(self.args) self.env.seed(self.args.seed) # stack several consecutive frames together if self.args.encoder_type.startswith('pixel'): self.env = utils.FrameStack(self.env, k=self.args.frame_stack) # create replay buffer self.data_buffer = ReplayBuffer(size=self.args.replay_buffer_capacity, obs_shape=(self.args.frame_stack*self.args.channels,self.args.image_size,self.args.image_size), action_size=self.env.action_space.shape[0], seq_len=self.args.episode_length, batch_size=args.batch_size, args=self.args) # create work directory utils.make_dir(self.args.work_dir) self.video_dir = utils.make_dir(os.path.join(self.args.work_dir, 'video')) self.model_dir = utils.make_dir(os.path.join(self.args.work_dir, 'model')) self.buffer_dir = utils.make_dir(os.path.join(self.args.work_dir, 'buffer')) # create models self.build_models(use_saved=False, saved_model_dir=self.model_dir) def build_models(self, use_saved, saved_model_dir=None): self.obs_encoder = ObservationEncoder( obs_shape=(self.args.frame_stack*self.args.channels,self.args.image_size,self.args.image_size), # (12,84,84) state_size=self.args.state_size # 128 ) self.obs_decoder = ObservationDecoder( state_size=self.args.state_size, # 128 output_shape=(self.args.frame_stack*self.args.channels,self.args.image_size,self.args.image_size) # (12,84,84) ) self.transition_model = TransitionModel( state_size=self.args.state_size, # 128 hidden_size=self.args.hidden_size, # 256 action_size=self.env.action_space.shape[0], # 6 history_size=self.args.history_size, # 128 ) # model parameters self.model_parameters = list(self.obs_encoder.parameters()) + list(self.obs_decoder.parameters()) + list(self.transition_model.parameters()) # optimizer self.optimizer = torch.optim.Adam(self.model_parameters, lr=self.args.encoder_lr) if use_saved: self._use_saved_models(saved_model_dir) def _use_saved_models(self, saved_model_dir): self.obs_encoder.load_state_dict(torch.load(os.path.join(saved_model_dir, 'obs_encoder.pt'))) self.obs_decoder.load_state_dict(torch.load(os.path.join(saved_model_dir, 'obs_decoder.pt'))) self.transition_model.load_state_dict(torch.load(os.path.join(saved_model_dir, 'transition_model.pt'))) def collect_random_episodes(self, episodes): obs = self.env.reset() done = False #video = VideoRecorder(self.video_dir if args.save_video else None, resource_files=args.resource_files) for episode_count in tqdm.tqdm(range(episodes), desc='Collecting episodes'): #self.env.video.init(enabled=True) for i in range(self.args.episode_length): action = self.env.action_space.sample() next_obs, _, done, _ = self.env.step(action) self.data_buffer.add(obs, action, next_obs, episode_count+1, done) #if args.save_video: # self.env.video.record(self.env) if done: obs = self.env.reset() done=False else: obs = next_obs #self.env.video.save('%d.mp4' % episode_count) print("Collected {} random episodes".format(episode_count+1)) def train(self): # collect experience self.collect_random_episodes(self.args.batch_size) # Group observations and next_observations by steps observations = torch.Tensor(self.data_buffer.group_steps(self.data_buffer,"observations")).float() next_observations = torch.Tensor(self.data_buffer.group_steps(self.data_buffer,"next_observations")).float() actions = torch.Tensor(self.data_buffer.group_steps(self.data_buffer,"actions",obs=False)).float() # Initialize transition model states self.transition_model.init_states(self.args.batch_size, device="cpu") # (N,128) self.history = self.transition_model.prev_history # (N,128) # Train encoder previous_information_loss = 0 previous_encoder_loss = 0 for i in range(self.args.episode_length): # Encode observations and next_observations self.states_dist = self.obs_encoder(observations[i]) self.next_states_dist = self.obs_encoder(next_observations[i]) # Sample states and next_states self.states = self.states_dist["sample"] # (N,128) self.next_states = self.next_states_dist["sample"] # (N,128) self.actions = actions[i] # (N,6) # Calculate upper bound loss past_latent_loss = previous_information_loss + self._upper_bound_minimization(self.states, self.next_states) # Calculate encoder loss past_encoder_loss = previous_encoder_loss + self._past_encoder_loss(self.states, self.next_states, self.states_dist, self.next_states_dist, self.actions, self.history, i) previous_information_loss = past_latent_loss previous_encoder_loss = past_encoder_loss def _upper_bound_minimization(self, states, next_states): club_sample = CLUBSample(self.args.state_size, self.args.state_size, self.args.hidden_size) club_loss = club_sample(states, next_states) return club_loss def _past_encoder_loss(self, states, next_states, states_dist, next_states_dist, actions, history, step): # Imagine next state if step == 0: actions = torch.zeros(self.args.batch_size, self.env.action_space.shape[0]).float() # Zero action for first step imagined_next_states = self.transition_model.imagine_step(states, actions, history) self.history = imagined_next_states["history"] else: imagined_next_states = self.transition_model.imagine_step(states, actions, self.history) # (N,128) # State Distribution imagined_next_states_dist = imagined_next_states["distribution"] # KL divergence loss loss = torch.distributions.kl.kl_divergence(imagined_next_states_dist, next_states_dist["distribution"]).mean() return loss if __name__ == '__main__': args = parse_args() dpi = DPI(args) dpi.train()