def make_env(vv, env_names=None):
if env_names is None:
env_names = []
morphologies = ['walker', 'hopper', 'cheetah']
for morphology in morphologies:
env_names += [
name[:-4] for name in os.listdir(vv['xml_dir'])
if '.xml' in name and morphology in name
]
elif len(env_names) == 0:
return [], []
env_names = list(dict.fromkeys(env_names))
limb_obs_size, max_action = utils.registerEnvs(env_names, 250, None)
envs = []
for env_name in env_names:
env = utils.makeEnvWrapper(env_name, seed=100, obs_max_len=None)()
envs.append(env)
return envs, env_names
def generate_video(args):
total_time = args.video_length * 100
exp_path = os.path.join(DATA_DIR, "EXP_{:04d}".format(args.expID))
if not os.path.exists(exp_path):
raise FileNotFoundError('checkpoint does not exist')
print('*** folder fetched: {} ***'.format(exp_path))
os.makedirs(VIDEO_DIR, exist_ok=True)
# Retrieve MuJoCo XML files for visualizing ========================================
env_names = []
args.graphs = dict()
# existing envs
if not args.custom_xml:
for morphology in args.morphologies:
env_names += [
name[:-4] for name in os.listdir(XML_DIR)
if '.xml' in name and morphology in name
]
for name in env_names:
args.graphs[name] = utils.getGraphStructure(
os.path.join(XML_DIR, '{}.xml'.format(name)))
# custom envs
else:
if os.path.isfile(args.custom_xml):
assert '.xml' in os.path.basename(
args.custom_xml), 'No XML file found.'
name = os.path.basename(args.custom_xml)
env_names.append(name[:-4]) # truncate the .xml suffix
args.graphs[name[:-4]] = utils.getGraphStructure(args.custom_xml)
elif os.path.isdir(args.custom_xml):
for name in os.listdir(args.custom_xml):
if '.xml' in name:
env_names.append(name[:-4])
args.graphs[name[:-4]] = utils.getGraphStructure(
os.path.join(args.custom_xml, name))
env_names.sort()
# Set up env and policy ================================================
args.limb_obs_size, args.max_action = utils.registerEnvs(
env_names, args.max_episode_steps, args.custom_xml)
# determine the maximum number of children in all the envs
if args.max_children is None:
args.max_children = utils.findMaxChildren(env_names, args.graphs)
# setup agent policy
policy = TD3.TD3(args)
try:
cp.load_model_only(exp_path, policy)
except:
raise Exception(
'policy loading failed; check policy params (hint 1: max_children must be the same as the trained policy; hint 2: did the trained policy use torchfold (consider pass --disable_fold)?'
)
torch.manual_seed(args.seed)
np.random.seed(args.seed)
# visualize ===========================================================
for env_name in env_names:
# create env
env = utils.makeEnvWrapper(env_name, seed=args.seed,
obs_max_len=None)()
policy.change_morphology(args.graphs[env_name])
# create unique temp frame dir
count = 0
frame_dir = os.path.join(
VIDEO_DIR, "frames_{}_{}_{}".format(args.expID, env_name, count))
while os.path.exists(frame_dir):
count += 1
frame_dir = "{}/frames_{}_{}_{}".format(VIDEO_DIR, args.expID,
env_name, count)
os.makedirs(frame_dir)
# create video name without overwriting previously generated videos
count = 0
video_name = "%04d_%s_%d" % (args.expID, env_name, count)
while os.path.exists("{}/{}.mp4".format(VIDEO_DIR, video_name)):
count += 1
video_name = "%04d_%s_%d" % (args.expID, env_name, count)
# init env vars
done = True
print("-" * 50)
time_step_counter = 0
printProgressBar(0, total_time)
while time_step_counter < total_time:
printProgressBar(time_step_counter + 1,
total_time,
prefix=env_name)
if done:
obs = env.reset()
done = False
episode_reward = 0
action = policy.select_action(np.array(obs))
# perform action in the environment
new_obs, reward, done, _ = env.step(action)
episode_reward += reward
# draw image of current frame
image_data = env.sim.render(VIDEO_RESOLUATION[0],
VIDEO_RESOLUATION[1],
camera_name="track")
img = Image.fromarray(image_data, "RGB")
draw = ImageDraw.Draw(img)
font = ImageFont.truetype('./misc/sans-serif.ttf', 24)
draw.text((200, 10),
"Instant Reward: " + str(reward), (255, 0, 0),
font=font)
draw.text((200, 35),
"Episode Reward: " + str(episode_reward), (255, 0, 0),
font=font)
img.save(
os.path.join(frame_dir, "frame-%.10d.png" % time_step_counter))
obs = new_obs
time_step_counter += 1
# redirect output so output does not show on window
FNULL = open(os.devnull, 'w')
# create video
subprocess.call([
'ffmpeg', '-framerate', '50', '-y', '-i',
os.path.join(frame_dir, 'frame-%010d.png'), '-r', '30', '-pix_fmt',
'yuv420p',
os.path.join(VIDEO_DIR, '{}.mp4'.format(video_name))
],
stdout=FNULL,
stderr=subprocess.STDOUT)
subprocess.call(['rm', '-rf', frame_dir])
def train(_run):
# Set up directories ===========================================================
os.makedirs(DATA_DIR, exist_ok=True)
os.makedirs(BUFFER_DIR, exist_ok=True)
exp_name = args.expID
exp_path = os.path.join(DATA_DIR, exp_name)
rb_path = os.path.join(BUFFER_DIR, exp_name)
os.makedirs(exp_path, exist_ok=True)
os.makedirs(rb_path, exist_ok=True)
# save arguments
with open(os.path.join(exp_path, "args.txt"), "w+") as f:
json.dump(args.__dict__, f, indent=2)
# Retrieve MuJoCo XML files for training ========================================
envs_train_names = []
args.graphs = dict()
# existing envs
if not args.custom_xml:
for morphology in args.morphologies:
envs_train_names += [
name[:-4] for name in os.listdir(XML_DIR)
if ".xml" in name and morphology in name
]
for name in envs_train_names:
args.graphs[name] = utils.getGraphStructure(
os.path.join(XML_DIR, "{}.xml".format(name)),
args.observation_graph_type,
)
# custom envs
else:
if os.path.isfile(args.custom_xml):
assert ".xml" in os.path.basename(
args.custom_xml), "No XML file found."
name = os.path.basename(args.custom_xml)
envs_train_names.append(name[:-4]) # truncate the .xml suffix
args.graphs[name[:-4]] = utils.getGraphStructure(
args.custom_xml, args.observation_graph_type)
elif os.path.isdir(args.custom_xml):
for name in os.listdir(args.custom_xml):
if ".xml" in name:
envs_train_names.append(name[:-4])
args.graphs[name[:-4]] = utils.getGraphStructure(
os.path.join(args.custom_xml, name),
args.observation_graph_type)
envs_train_names.sort()
num_envs_train = len(envs_train_names)
print("#" * 50 + "\ntraining envs: {}\n".format(envs_train_names) +
"#" * 50)
# Set up training env and policy ================================================
args.limb_obs_size, args.max_action = utils.registerEnvs(
envs_train_names, args.max_episode_steps, args.custom_xml)
max_num_limbs = max(
[len(args.graphs[env_name]) for env_name in envs_train_names])
# create vectorized training env
obs_max_len = (
max([len(args.graphs[env_name])
for env_name in envs_train_names]) * args.limb_obs_size)
envs_train = [
utils.makeEnvWrapper(name, obs_max_len, args.seed)
for name in envs_train_names
]
envs_train = SubprocVecEnv(envs_train) # vectorized env
# set random seeds
torch.manual_seed(args.seed)
np.random.seed(args.seed)
# determine the maximum number of children in all the training envs
if args.max_children is None:
args.max_children = utils.findMaxChildren(envs_train_names,
args.graphs)
args.max_num_limbs = max_num_limbs
# setup agent policy
policy = TD3.TD3(args)
# Create new training instance or load previous checkpoint ========================
if cp.has_checkpoint(exp_path, rb_path):
print("*** loading checkpoint from {} ***".format(exp_path))
(
total_timesteps,
episode_num,
replay_buffer,
num_samples,
loaded_path,
) = cp.load_checkpoint(exp_path, rb_path, policy, args)
print("*** checkpoint loaded from {} ***".format(loaded_path))
else:
print("*** training from scratch ***")
# init training vars
total_timesteps = 0
episode_num = 0
num_samples = 0
# different replay buffer for each env; avoid using too much memory if there are too many envs
replay_buffer = dict()
if num_envs_train > args.rb_max // 1e6:
for name in envs_train_names:
replay_buffer[name] = utils.ReplayBuffer(
max_size=args.rb_max // num_envs_train)
else:
for name in envs_train_names:
replay_buffer[name] = utils.ReplayBuffer()
# Initialize training variables ================================================
writer = SummaryWriter("%s/%s/" % (DATA_DIR, exp_name))
s = time.time()
timesteps_since_saving = 0
timesteps_since_saving_model_only = 0
this_training_timesteps = 0
collect_done = True
episode_timesteps_list = [0 for i in range(num_envs_train)]
done_list = [True for i in range(num_envs_train)]
# Start training ===========================================================
model_savings_so_far = 0
while total_timesteps < args.max_timesteps:
# train and log after one episode for each env
if collect_done:
# log updates and train policy
if this_training_timesteps != 0:
policy.train(
replay_buffer,
episode_timesteps_list,
args.batch_size,
args.discount,
args.tau,
args.policy_noise,
args.noise_clip,
args.policy_freq,
graphs=args.graphs,
envs_train_names=envs_train_names[:num_envs_train],
)
# add to tensorboard display
for i in range(num_envs_train):
writer.add_scalar(
"{}_episode_reward".format(envs_train_names[i]),
episode_reward_list[i],
total_timesteps,
)
writer.add_scalar(
"{}_episode_len".format(envs_train_names[i]),
episode_timesteps_list[i],
total_timesteps,
)
if not args.debug:
ex.log_scalar(
f"{envs_train_names[i]}_episode_reward",
float(episode_reward_list[i]),
total_timesteps,
)
ex.log_scalar(
f"{envs_train_names[i]}_episode_len",
float(episode_timesteps_list[i]),
total_timesteps,
)
if not args.debug:
ex.log_scalar(
"total_timesteps",
float(total_timesteps),
total_timesteps,
)
# print to console
print(
"-" * 50 +
"\nExpID: {}, FPS: {:.2f}, TotalT: {}, EpisodeNum: {}, SampleNum: {}, ReplayBSize: {}"
.format(
args.expID,
this_training_timesteps / (time.time() - s),
total_timesteps,
episode_num,
num_samples,
sum([
len(replay_buffer[name].storage)
for name in envs_train_names
]),
))
for i in range(len(envs_train_names)):
print("{} === EpisodeT: {}, Reward: {:.2f}".format(
envs_train_names[i],
episode_timesteps_list[i],
episode_reward_list[i],
))
# save model and replay buffers
if timesteps_since_saving >= args.save_freq:
timesteps_since_saving = 0
model_saved_path = cp.save_model(
exp_path,
policy,
total_timesteps,
episode_num,
num_samples,
replay_buffer,
envs_train_names,
args,
model_name=f"model_{model_savings_so_far}.pyth",
)
model_savings_so_far += 1
print("*** model saved to {} ***".format(model_saved_path))
if args.save_buffer:
rb_saved_path = cp.save_replay_buffer(
rb_path, replay_buffer)
print("*** replay buffers saved to {} ***".format(
rb_saved_path))
# reset training variables
obs_list = envs_train.reset()
done_list = [False for i in range(num_envs_train)]
episode_reward_list = [0 for i in range(num_envs_train)]
episode_timesteps_list = [0 for i in range(num_envs_train)]
episode_num += num_envs_train
# create reward buffer to store reward for one sub-env when it is not done
episode_reward_list_buffer = [0 for i in range(num_envs_train)]
# start sampling ===========================================================
# sample action randomly for sometime and then according to the policy
if total_timesteps < args.start_timesteps * num_envs_train:
action_list = [
np.random.uniform(
low=envs_train.action_space.low[0],
high=envs_train.action_space.high[0],
size=max_num_limbs,
) for i in range(num_envs_train)
]
else:
action_list = []
for i in range(num_envs_train):
# dynamically change the graph structure of the modular policy
policy.change_morphology(args.graphs[envs_train_names[i]])
# remove 0 padding of obs before feeding into the policy (trick for vectorized env)
obs = np.array(
obs_list[i][:args.limb_obs_size *
len(args.graphs[envs_train_names[i]])])
policy_action = policy.select_action(obs)
if args.expl_noise != 0:
policy_action = (policy_action + np.random.normal(
0, args.expl_noise, size=policy_action.size)).clip(
envs_train.action_space.low[0],
envs_train.action_space.high[0])
# add 0-padding to ensure that size is the same for all envs
policy_action = np.append(
policy_action,
np.array([
0 for i in range(max_num_limbs - policy_action.size)
]),
)
action_list.append(policy_action)
# perform action in the environment
new_obs_list, reward_list, curr_done_list, _ = envs_train.step(
action_list)
# record if each env has ever been 'done'
done_list = [
done_list[i] or curr_done_list[i] for i in range(num_envs_train)
]
for i in range(num_envs_train):
# add the instant reward to the cumulative buffer
# if any sub-env is done at the momoent, set the episode reward list to be the value in the buffer
episode_reward_list_buffer[i] += reward_list[i]
if curr_done_list[i] and episode_reward_list[i] == 0:
episode_reward_list[i] = episode_reward_list_buffer[i]
episode_reward_list_buffer[i] = 0
done_bool = float(curr_done_list[i])
if episode_timesteps_list[i] + 1 == args.max_episode_steps:
done_bool = 0
done_list[i] = True
# remove 0 padding before storing in the replay buffer (trick for vectorized env)
num_limbs = len(args.graphs[envs_train_names[i]])
obs = np.array(obs_list[i][:args.limb_obs_size * num_limbs])
new_obs = np.array(new_obs_list[i][:args.limb_obs_size *
num_limbs])
action = np.array(action_list[i][:num_limbs])
# insert transition in the replay buffer
replay_buffer[envs_train_names[i]].add(
(obs, new_obs, action, reward_list[i], done_bool))
num_samples += 1
# do not increment episode_timesteps if the sub-env has been 'done'
if not done_list[i]:
episode_timesteps_list[i] += 1
total_timesteps += 1
this_training_timesteps += 1
timesteps_since_saving += 1
timesteps_since_saving_model_only += 1
obs_list = new_obs_list
collect_done = all(done_list)
# save checkpoint after training ===========================================================
model_saved_path = cp.save_model(
exp_path,
policy,
total_timesteps,
episode_num,
num_samples,
replay_buffer,
envs_train_names,
args,
)
print("*** training finished and model saved to {} ***".format(
model_saved_path))
def train(args):
# Set up directories ===========================================================
os.makedirs(DATA_DIR, exist_ok=True)
os.makedirs(BUFFER_DIR, exist_ok=True)
exp_name = "EXP_%04d" % (args.expID)
exp_path = os.path.join(DATA_DIR, exp_name)
rb_path = os.path.join(BUFFER_DIR, exp_name)
os.makedirs(exp_path, exist_ok=True)
os.makedirs(rb_path, exist_ok=True)
# save arguments
with open(os.path.join(exp_path, 'args.txt'), 'w+') as f:
json.dump(args.__dict__, f, indent=2)
# Retrieve MuJoCo XML files for training ========================================
agent_name = args.agent_name
envs_train_names = [agent_name]
args.graphs = dict()
# existing envs
if not args.custom_xml:
args.graphs[agent_name] = utils.getGraphStructure(
os.path.join(XML_DIR, '{}.xml'.format(agent_name)))
# custom envs
num_envs_train = len(envs_train_names)
print("#" * 50 + '\ntraining envs: {}\n'.format(envs_train_names) +
"#" * 50)
# Set up training env and policy ================================================
args.limb_obs_size, args.max_action = utils.registerEnvs(
envs_train_names, args.max_episode_steps, args.custom_xml)
max_num_limbs = max(
[len(args.graphs[env_name]) for env_name in envs_train_names])
# create vectorized training env
obs_max_len = max(
[len(args.graphs[env_name])
for env_name in envs_train_names]) * args.limb_obs_size
envs_train = [
utils.makeEnvWrapper(name, obs_max_len, args.seed)
for name in envs_train_names
]
# envs_train = SubprocVecEnv(envs_train) # vectorized env
# set random seeds
torch.manual_seed(args.seed)
np.random.seed(args.seed)
# determine the maximum number of children in all the training envs
if args.max_children is None:
args.max_children = utils.findMaxChildren(envs_train_names,
args.graphs)
# setup agent policy
policy = TD3.LifeLongTD3(args)
# Create new training instance or load previous checkpoint ========================
if cp.has_checkpoint(exp_path, rb_path):
print("*** loading checkpoint from {} ***".format(exp_path))
total_timesteps, episode_num, replay_buffer, num_samples, loaded_path = cp.load_checkpoint(
exp_path, rb_path, policy, args)
print("*** checkpoint loaded from {} ***".format(loaded_path))
else:
print("*** training from scratch ***")
# init training vars
total_timesteps = 0
episode_num = 0
num_samples = 0
# different replay buffer for each env; avoid using too much memory if there are too many envs
# Initialize training variables ================================================
writer = SummaryWriter("%s/%s/" % (DATA_DIR, exp_name))
s = time.time()
# TODO: may have to change the following codes into the loop
timesteps_since_saving = 0
this_training_timesteps = 0
episode_timesteps = 0
episode_reward = 0
episode_reward_buffer = 0
done = True
# Start training ===========================================================
for env_handle, env_name in zip(envs_train, envs_train_names):
env = env_handle()
obs = env.reset()
replay_buffer = utils.ReplayBuffer(max_size=args.rb_max)
policy.change_morphology(args.graphs[env_name])
policy.graph = args.graphs[env_name]
task_timesteps = 0
done = False
episode_timesteps = 0
episode_reward = 0
episode_reward_buffer = 0
while task_timesteps < args.max_timesteps:
# train and log after one episode for each env
if done:
# log updates and train policy
if this_training_timesteps != 0:
policy.train(replay_buffer,
episode_timesteps,
args.batch_size,
args.discount,
args.tau,
args.policy_noise,
args.noise_clip,
args.policy_freq,
graphs=args.graphs,
env_name=env_name)
# add to tensorboard display
writer.add_scalar('{}_episode_reward'.format(env_name),
episode_reward, task_timesteps)
writer.add_scalar('{}_episode_len'.format(env_name),
episode_timesteps, task_timesteps)
# print to console
print(
"-" * 50 +
"\nExpID: {}, FPS: {:.2f}, TotalT: {}, EpisodeNum: {}, SampleNum: {}, ReplayBSize: {}"
.format(args.expID, this_training_timesteps /
(time.time() -
s), total_timesteps, episode_num, num_samples,
len(replay_buffer.storage)))
print("{} === EpisodeT: {}, Reward: {:.2f}".format(
env_name, episode_timesteps, episode_reward))
this_training_timesteps = 0
s = time.time()
# save model and replay buffers
if timesteps_since_saving >= args.save_freq:
print("!!!!!")
timesteps_since_saving = 0
model_saved_path = cp.save_model(exp_path, policy,
total_timesteps,
episode_num, num_samples,
{env_name: replay_buffer},
envs_train_names, args)
print("*** model saved to {} ***".format(model_saved_path))
rb_saved_path = cp.save_replay_buffer(
rb_path, {env_name: replay_buffer})
print("*** replay buffers saved to {} ***".format(
rb_saved_path))
# reset training variables
obs = env.reset()
done = False
episode_reward = 0
episode_timesteps = 0
episode_num += 1
# create reward buffer to store reward for one sub-env when it is not done
episode_reward_buffer = 0
# start sampling ===========================================================
# sample action randomly for sometime and then according to the policy
if task_timesteps < args.start_timesteps:
action = np.random.uniform(low=env.action_space.low[0],
high=env.action_space.high[0],
size=max_num_limbs)
else:
# remove 0 padding of obs before feeding into the policy (trick for vectorized env)
obs = np.array(obs[:args.limb_obs_size *
len(args.graphs[env_name])])
policy_action = policy.select_action(obs)
if args.expl_noise != 0:
policy_action = (policy_action + np.random.normal(
0, args.expl_noise, size=policy_action.size)).clip(
env.action_space.low[0], env.action_space.high[0])
# add 0-padding to ensure that size is the same for all envs
action = np.append(
policy_action,
np.array([
0 for i in range(max_num_limbs - policy_action.size)
]))
# perform action in the environment
new_obs, reward, done, _ = env.step(action)
# record if each env has ever been 'done'
# add the instant reward to the cumulative buffer
# if any sub-env is done at the momoent, set the episode reward list to be the value in the buffer
episode_reward_buffer += reward
if done and episode_reward == 0:
episode_reward = episode_reward_buffer
episode_reward_buffer = 0
writer.add_scalar('{}_instant_reward'.format(env_name), reward,
task_timesteps)
done_bool = float(done)
if episode_timesteps + 1 == args.max_episode_steps:
done_bool = 0
done = True
# remove 0 padding before storing in the replay buffer (trick for vectorized env)
num_limbs = len(args.graphs[env_name])
obs = np.array(obs[:args.limb_obs_size * num_limbs])
new_obs = np.array(new_obs[:args.limb_obs_size * num_limbs])
action = np.array(action[:num_limbs])
# insert transition in the replay buffer
replay_buffer.add((obs, new_obs, action, reward, done_bool))
num_samples += 1
# do not increment episode_timesteps if the sub-env has been 'done'
if not done:
episode_timesteps += 1
total_timesteps += 1
task_timesteps += 1
this_training_timesteps += 1
timesteps_since_saving += 1
obs = new_obs
policy.next_task()
# save checkpoint after training ===========================================================
model_saved_path = cp.save_model(exp_path, policy, total_timesteps,
episode_num, num_samples,
{envs_train_names[-1]: replay_buffer},
envs_train_names, args)
print("*** training finished and model saved to {} ***".format(
model_saved_path))
def train(args):
# Set up directories ===========================================================
os.makedirs(DATA_DIR, exist_ok=True)
os.makedirs(BUFFER_DIR, exist_ok=True)
exp_name = "EXP_%04d" % (args.expID)
exp_path = os.path.join(DATA_DIR, exp_name)
rb_path = os.path.join(BUFFER_DIR, exp_name)
os.makedirs(exp_path, exist_ok=True)
os.makedirs(rb_path, exist_ok=True)
# save arguments
with open(os.path.join(exp_path, 'args.txt'), 'w+') as f:
json.dump(args.__dict__, f, indent=2)
# Retrieve MuJoCo XML files for training ========================================
envs_train_names = []
args.graphs = dict()
# existing envs
if not args.custom_xml:
if args.predefined_order:
envs_train_names = [
'walker_7_flipped', 'walker_7_main', 'walker_6_flipped',
'walker_5_main', 'walker_4_main', 'walker_5_flipped',
'walker_3_main', 'walker_6_main', 'walker_3_flipped',
'walker_4_flipped'
]
else:
for morphology in args.morphologies:
envs_train_names += [
name[:-4] for name in os.listdir(XML_DIR)
if '.xml' in name and morphology in name
]
envs_train_names.sort()
total_num_envs = len(envs_train_names)
train_envs = envs_train_names[:int(args.train_ratio * total_num_envs)]
test_envs = envs_train_names[int(args.train_ratio * total_num_envs):]
envs_train_names = train_envs
for name in envs_train_names:
args.graphs[name] = utils.getGraphStructure(
os.path.join(XML_DIR, '{}.xml'.format(name)))
# custom envs
else:
if os.path.isfile(args.custom_xml):
assert '.xml' in os.path.basename(
args.custom_xml), 'No XML file found.'
name = os.path.basename(args.custom_xml)
envs_train_names.append(name[:-4]) # truncate the .xml suffix
args.graphs[name[:-4]] = utils.getGraphStructure(args.custom_xml)
elif os.path.isdir(args.custom_xml):
for name in os.listdir(args.custom_xml):
if '.xml' in name:
envs_train_names.append(name[:-4])
args.graphs[name[:-4]] = utils.getGraphStructure(
os.path.join(args.custom_xml, name))
# envs_train_names.sort()
num_envs_train = len(envs_train_names)
print("#" * 50 + '\ntraining envs: {}\n'.format(envs_train_names) +
"#" * 50)
# Set up training env and policy ================================================
args.limb_obs_size, args.max_action = utils.registerEnvs(
envs_train_names, args.max_episode_steps, args.custom_xml)
max_num_limbs = max(
[len(args.graphs[env_name]) for env_name in envs_train_names])
# create vectorized training env
obs_max_len = max(
[len(args.graphs[env_name])
for env_name in envs_train_names]) * args.limb_obs_size
# envs_train = SubprocVecEnv(envs_train) # vectorized env
# set random seeds
torch.manual_seed(args.seed)
np.random.seed(args.seed)
# determine the maximum number of children in all the training envs
if args.max_children is None:
args.max_children = utils.findMaxChildren(envs_train_names,
args.graphs)
# setup agent policy
policy = TD3.LifeLongTD3(args)
# Create new training instance or load previous checkpoint ========================
if cp.has_checkpoint(exp_path, rb_path):
print("*** loading checkpoint from {} ***".format(exp_path))
total_timesteps, episode_num, replay_buffer, num_samples, loaded_path = cp.load_checkpoint(
exp_path, rb_path, policy, args)
print("*** checkpoint loaded from {} ***".format(loaded_path))
else:
print("*** training from scratch ***")
# init training vars
total_timesteps = 0
episode_num = 0
num_samples = 0
# different replay buffer for each env; avoid using too much memory if there are too many envs
# Initialize training variables ================================================
writer = SummaryWriter("%s/%s/" % (DATA_DIR, exp_name))
s = time.time()
# TODO: may have to change the following codes into the loop
timesteps_since_saving = 0
this_training_timesteps = 0
# Start training ===========================================================
for env_name in envs_train_names:
print("new env: {}".format(env_name))
envs_train = []
for i in range(args.num_parallel):
envs_train.append(
utils.makeEnvWrapperParallel(env_name, obs_max_len, args.seed))
envs_train = SubprocVecEnv(envs_train, in_series=1)
replay_buffer = utils.ReplayBuffer(max_size=args.rb_max)
policy.change_morphology(args.graphs[env_name])
policy.graph = args.graphs[env_name]
task_timesteps = 0
collect_done = True
obs_list = envs_train.reset()
done_list = [False for i in range(args.num_parallel)]
episode_reward_list = [0 for i in range(args.num_parallel)]
episode_timesteps_list = [0 for i in range(args.num_parallel)]
# create reward buffer to store reward for one sub-env when it is not done
episode_reward_list_buffer = [0 for i in range(args.num_parallel)]
mean_reward = 0
this_training_timesteps = 0
while task_timesteps < args.max_timesteps:
# train and log after one episode for each env
if collect_done:
# log updates and train policy
if this_training_timesteps != 0:
mean_reward = np.array(episode_reward_list).mean()
if mean_reward < args.success_thres:
policy.train(replay_buffer,
np.array(episode_timesteps_list).sum(),
args.batch_size,
args.discount,
args.tau,
args.policy_noise,
args.noise_clip,
args.policy_freq,
graphs=args.graphs,
env_name=env_name)
# add to tensorboard display
writer.add_scalar(
'{}_episode_mean_reward'.format(env_name), mean_reward,
task_timesteps)
# for i in range(args.num_parallel):
# writer.add_scalar('{}_episode_reward_proc{}'.format(env_name,i), episode_reward_list[i], task_timesteps)
# writer.add_scalar('{}_episode_len_proc{}'.format(env_name,i), episode_timesteps_list[i], task_timesteps)
# print to console
print(
"-" * 50 +
"\nExpID: {}, FPS: {:.2f}, TotalT: {}, taskT:{}, EpisodeNum: {}, SampleNum: {}, ReplayBSize: {}"
.format(args.expID, this_training_timesteps /
(time.time() - s), total_timesteps,
task_timesteps, episode_num, num_samples,
sum([len(replay_buffer.storage)])))
for i in range(args.num_parallel):
print("{} process {} === EpisodeT: {}, Reward: {:.2f}".
format(env_name, i, episode_timesteps_list[i],
episode_reward_list[i]))
print("mean reward {}".format(mean_reward))
this_training_timesteps = 0
s = time.time()
# save model and replay buffers
if timesteps_since_saving >= args.save_freq:
timesteps_since_saving = 0
model_saved_path = cp.save_model_lifelong(
exp_path, policy, total_timesteps, episode_num,
num_samples, replay_buffer, env_name, args)
print("*** model saved to {} ***".format(model_saved_path))
rb_saved_path = cp.save_replay_buffer_lifelong(
rb_path, replay_buffer, env_name)
print("*** replay buffers saved to {} ***".format(
rb_saved_path))
# reset training variables
obs_list = envs_train.reset()
done_list = [False for i in range(args.num_parallel)]
episode_reward_list = [0 for i in range(args.num_parallel)]
episode_timesteps_list = [0 for i in range(args.num_parallel)]
episode_num += args.num_parallel
# create reward buffer to store reward for one sub-env when it is not done
episode_reward_list_buffer = [
0 for i in range(args.num_parallel)
]
if mean_reward > args.success_thres:
print(
"satisfied training requirement, change to the next task"
)
break
# start sampling ===========================================================
# sample action randomly for sometime and then according to the policy
if task_timesteps < args.start_timesteps:
action_list = [
np.random.uniform(low=envs_train.action_space.low[0],
high=envs_train.action_space.high[0],
size=max_num_limbs)
for i in range(args.num_parallel)
]
else:
action_list = []
for i in range(args.num_parallel):
# remove 0 padding of obs before feeding into the policy (trick for vectorized env)
obs = np.array(obs_list[i][:args.limb_obs_size *
len(args.graphs[env_name])])
policy_action = policy.select_action(obs)
if args.expl_noise != 0:
policy_action = (policy_action + np.random.normal(
0, args.expl_noise, size=policy_action.size)).clip(
envs_train.action_space.low[0],
envs_train.action_space.high[0])
# add 0-padding to ensure that size is the same for all envs
policy_action = np.append(
policy_action,
np.array([
0
for i in range(max_num_limbs - policy_action.size)
]))
action_list.append(policy_action)
# perform action in the environment
new_obs_list, reward_list, curr_done_list, _ = envs_train.step(
action_list)
# record if each env has ever been 'done'
done_list = [
done_list[i] or curr_done_list[i]
for i in range(args.num_parallel)
]
# record if each env has ever been 'done'
# add the instant reward to the cumulative buffer
for i in range(args.num_parallel):
# add the instant reward to the cumulative buffer
# if any sub-env is done at the momoent, set the episode reward list to be the value in the buffer
episode_reward_list_buffer[i] += reward_list[i]
if curr_done_list[i] and episode_reward_list[i] == 0:
episode_reward_list[i] = episode_reward_list_buffer[i]
episode_reward_list_buffer[i] = 0
writer.add_scalar(
'{}_instant_reward_pro{}'.format(env_name, i),
reward_list[i], task_timesteps)
done_bool = float(curr_done_list[i])
if episode_timesteps_list[i] + 1 == args.max_episode_steps:
done_bool = 0
done_list[i] = True
# remove 0 padding before storing in the replay buffer (trick for vectorized env)
num_limbs = len(args.graphs[env_name])
obs = np.array(obs_list[i][:args.limb_obs_size * num_limbs])
new_obs = np.array(new_obs_list[i][:args.limb_obs_size *
num_limbs])
action = np.array(action_list[i][:num_limbs])
# insert transition in the replay buffer
replay_buffer.add(
(obs, new_obs, action, reward_list[i], done_bool))
num_samples += 1
# do not increment episode_timesteps if the sub-env has been 'done'
if not done_list[i]:
episode_timesteps_list[i] += 1
task_timesteps += 1
total_timesteps += 1
this_training_timesteps += 1
timesteps_since_saving += 1
obs_list = new_obs_list
collect_done = all(done_list)
model_saved_path = cp.save_model_lifelong(exp_path, policy,
total_timesteps, episode_num,
num_samples, replay_buffer,
env_name, args)
policy.next_task()
# save checkpoint after training ===========================================================
model_saved_path = cp.save_model_lifelong(exp_path, policy,
total_timesteps, episode_num,
num_samples, replay_buffer,
env_name, args)
print("*** training finished and model saved to {} ***".format(
model_saved_path))