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sac_main.py
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sac_main.py
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import importlib
import logging
import shutil
import sys
import time
import traceback
from pathlib import Path
import numpy as np
import algorithm.config_helper as config_helper
from algorithm.utils import EnvException
from .agent import Agent
from .sac_base import SAC_Base
class Main(object):
train_mode = True
_agent_class = Agent # For different environments
def __init__(self, root_dir, config_dir, args):
"""
config_path: the directory of config file
args: command arguments generated by argparse
"""
self._logger = logging.getLogger('sac')
config_abs_dir = self._init_config(root_dir, config_dir, args)
self._init_env()
self._init_sac(config_abs_dir)
self._run()
def _init_config(self, root_dir, config_dir, args):
config_abs_dir = Path(root_dir).joinpath(config_dir)
config_abs_path = config_abs_dir.joinpath('config.yaml')
default_config_abs_path = Path(__file__).resolve().parent.joinpath('default_config.yaml')
# Merge default_config.yaml and custom config.yaml
config = config_helper.initialize_config_from_yaml(default_config_abs_path,
config_abs_path,
args.config)
# Initialize config from command line arguments
self.train_mode = not args.run
self.render = args.render
self.run_in_editor = args.editor
self.additional_args = args.additional_args
self.alway_use_env_nn = args.use_env_nn
self.device = args.device
self.last_ckpt = args.ckpt
if args.name is not None:
config['base_config']['name'] = args.name
if args.port is not None:
config['base_config']['port'] = args.port
if args.nn is not None:
config['base_config']['nn'] = args.nn
if args.agents is not None:
config['base_config']['n_agents'] = args.agents
config['base_config']['name'] = config_helper.generate_base_name(config['base_config']['name'])
# The absolute directory of a specific training
model_abs_dir = Path(root_dir).joinpath('models',
config['base_config']['scene'],
config['base_config']['name'])
model_abs_dir.mkdir(parents=True, exist_ok=True)
self.model_abs_dir = model_abs_dir
if args.logger_in_file:
config_helper.set_logger(Path(model_abs_dir).joinpath(f'log.log'))
if self.train_mode:
config_helper.save_config(config, model_abs_dir, 'config.yaml')
config_helper.display_config(config, self._logger)
self.base_config = config['base_config']
self.reset_config = config['reset_config']
self.replay_config = config['replay_config']
self.sac_config = config['sac_config']
return config_abs_dir
def _init_env(self):
if self.base_config['env_type'] == 'UNITY':
from algorithm.env_wrapper.unity_wrapper import UnityWrapper
if self.run_in_editor:
self.env = UnityWrapper(train_mode=self.train_mode,
n_agents=self.base_config['n_agents'])
else:
self.env = UnityWrapper(train_mode=self.train_mode,
file_name=self.base_config['build_path'][sys.platform],
base_port=self.base_config['port'],
no_graphics=self.base_config['no_graphics'] and not self.render,
scene=self.base_config['scene'],
additional_args=self.additional_args,
n_agents=self.base_config['n_agents'])
elif self.base_config['env_type'] == 'GYM':
from algorithm.env_wrapper.gym_wrapper import GymWrapper
self.env = GymWrapper(train_mode=self.train_mode,
env_name=self.base_config['build_path'],
render=self.render,
n_agents=self.base_config['n_agents'])
else:
raise RuntimeError(f'Undefined Environment Type: {self.base_config["env_type"]}')
self.obs_shapes, self.d_action_size, self.c_action_size = self.env.init()
self.action_size = self.d_action_size + self.c_action_size
self._logger.info(f'{self.base_config["build_path"]} initialized')
def _init_sac(self, config_abs_dir: Path):
# If nn models exists, load saved model, or copy a new one
nn_model_abs_path = self.model_abs_dir.joinpath('nn_models.py')
if not self.alway_use_env_nn and nn_model_abs_path.exists():
spec = importlib.util.spec_from_file_location('nn', str(nn_model_abs_path))
else:
nn_abs_path = config_abs_dir.joinpath(f'{self.base_config["nn"]}.py')
spec = importlib.util.spec_from_file_location('nn', str(nn_abs_path))
if not self.alway_use_env_nn:
shutil.copyfile(nn_abs_path, nn_model_abs_path)
custom_nn_model = importlib.util.module_from_spec(spec)
spec.loader.exec_module(custom_nn_model)
self.sac = SAC_Base(obs_shapes=self.obs_shapes,
d_action_size=self.d_action_size,
c_action_size=self.c_action_size,
model_abs_dir=self.model_abs_dir,
model=custom_nn_model,
device=self.device,
train_mode=self.train_mode,
last_ckpt=self.last_ckpt,
replay_config=self.replay_config,
**self.sac_config)
def _run(self):
use_rnn = self.sac.use_rnn
obs_list = self.env.reset(reset_config=self.reset_config)
agents = [self._agent_class(i, use_rnn=self.sac.use_rnn)
for i in range(self.base_config['n_agents'])]
if use_rnn:
initial_rnn_state = self.sac.get_initial_rnn_state(len(agents))
rnn_state = initial_rnn_state
iteration = 0
trained_steps = 0
while iteration != self.base_config['max_iter']:
if self.base_config['max_step'] != -1 and trained_steps >= self.base_config['max_step']:
break
if self.base_config['reset_on_iteration'] or any([a.max_reached for a in agents]):
obs_list = self.env.reset(reset_config=self.reset_config)
for agent in agents:
agent.clear()
if use_rnn:
rnn_state = initial_rnn_state
else:
for agent in agents:
agent.reset()
action = np.zeros([len(agents), self.action_size], dtype=np.float32)
step = 0
iter_time = time.time()
try:
while not all([a.done for a in agents]):
if use_rnn:
# burn-in padding
for agent in [a for a in agents if a.is_empty()]:
for _ in range(self.sac.burn_in_step):
agent.add_transition([np.zeros(t) for t in self.obs_shapes],
np.zeros(self.action_size),
0, False, False,
[np.zeros(t) for t in self.obs_shapes],
initial_rnn_state[0])
action, next_rnn_state = self.sac.choose_rnn_action([o.astype(np.float32) for o in obs_list],
action,
rnn_state)
else:
action = self.sac.choose_action([o.astype(np.float32) for o in obs_list])
next_obs_list, reward, local_done, max_reached = self.env.step(action[..., :self.d_action_size],
action[..., self.d_action_size:])
if step == self.base_config['max_step_each_iter']:
local_done = [True] * len(agents)
max_reached = [True] * len(agents)
episode_trans_list = [agents[i].add_transition([o[i] for o in obs_list],
action[i],
reward[i],
local_done[i],
max_reached[i],
[o[i] for o in next_obs_list],
rnn_state[i] if use_rnn else None)
for i in range(len(agents))]
if self.train_mode:
episode_trans_list = [t for t in episode_trans_list if t is not None]
if len(episode_trans_list) != 0:
# n_obses_list, n_actions, n_rewards, next_obs_list, n_dones,
# n_rnn_states
for episode_trans in episode_trans_list:
self.sac.fill_replay_buffer(*episode_trans)
trained_steps = self.sac.train()
obs_list = next_obs_list
action[local_done] = np.zeros(self.action_size)
if use_rnn:
rnn_state = next_rnn_state
rnn_state[local_done] = initial_rnn_state[local_done]
step += 1
except EnvException as e:
self._logger.error(e)
self.env.close()
self._logger.info(f'Restarting {self.base_config["build_path"]}...')
self._init_env()
continue
except Exception as e:
self._logger.error(e)
self._logger.error(traceback.format_exc())
self._logger.error('Exiting...')
break
if self.train_mode:
self._log_episode_summaries(agents)
self._log_episode_info(iteration, time.time() - iter_time, agents)
if self.train_mode and (p := self.model_abs_dir.joinpath('save_model')).exists():
self.sac.save_model()
p.unlink()
iteration += 1
if self.train_mode:
self.sac.save_model()
self.env.close()
def _log_episode_summaries(self, agents):
rewards = np.array([a.reward for a in agents])
self.sac.write_constant_summaries([
{'tag': 'reward/mean', 'simple_value': rewards.mean()},
{'tag': 'reward/max', 'simple_value': rewards.max()},
{'tag': 'reward/min', 'simple_value': rewards.min()}
])
def _log_episode_info(self, iteration, iter_time, agents):
rewards = [a.reward for a in agents]
rewards = ", ".join([f"{i:6.1f}" for i in rewards])
steps = [a.steps for a in agents]
self._logger.info(f'{iteration}, T {iter_time:.2f}s, S {max(steps)}, R {rewards}')