def env_initialize(args, device):
if args.use_openai:
train_env = create_vectorize_atari_env(
args.env_name,
args.seed,
args.num_ales,
episode_life=args.episodic_life,
clip_rewards=args.clip_rewards,
max_frames=args.max_episode_length)
observation = torch.from_numpy(train_env.reset()).squeeze(1)
else:
train_env = AtariEnv(args.env_name,
args.num_ales,
color_mode='gray',
repeat_prob=0.0,
device=device,
rescale=True,
episodic_life=args.episodic_life,
clip_rewards=args.clip_rewards,
frameskip=4)
train_env.train()
observation = train_env.reset(initial_steps=args.ale_start_steps,
verbose=args.verbose).squeeze(-1)
if args.use_openai_test_env:
test_env = create_vectorize_atari_env(
args.env_name,
args.seed,
args.evaluation_episodes,
episode_life=False,
clip_rewards=False,
filename=os.path.join(os.path.dirname(args.output_filename),
'monitor.csv'))
test_env.reset()
else:
test_env = AtariEnv(args.env_name,
args.evaluation_episodes,
color_mode='gray',
repeat_prob=0.0,
device='cpu',
rescale=True,
episodic_life=False,
clip_rewards=False,
frameskip=4)
return train_env, test_env, observation
def worker(gpu, ngpus_per_node, callback, args):
args.gpu = gpu
if args.distributed:
args.seed += args.gpu
torch.cuda.set_device(args.gpu)
args.rank = int(os.environ['RANK']) if 'RANK' in os.environ else 0
if args.multiprocessing_distributed:
args.rank = args.rank * ngpus_per_node + args.gpu
torch.distributed.init_process_group(backend='nccl', init_method='tcp://127.0.0.1:8632',
world_size=args.world_size, rank=args.rank)
else:
args.rank = 0
if args.lr_scale:
scaled_lr = args.lr * math.sqrt((args.num_ales * args.world_size) / 16)
if args.rank == 0:
print('Scaled learning rate from {:4.4f} to {:4.4f}'.format(args.lr, scaled_lr))
args.lr = scaled_lr
args.use_cuda_env = args.use_cuda_env and torch.cuda.is_available()
args.no_cuda_train = (not args.no_cuda_train) and torch.cuda.is_available()
args.verbose = args.verbose and (args.rank == 0)
np.random.seed(args.seed)
torch.manual_seed(np.random.randint(1, 10000))
if args.use_cuda_env or (args.no_cuda_train == False):
torch.cuda.manual_seed(np.random.randint(1, 10000))
env_device = torch.device('cuda', args.gpu) if args.use_cuda_env else torch.device('cpu')
train_device = torch.device('cuda', args.gpu) if (args.no_cuda_train == False) else torch.device('cpu')
if args.rank == 0:
if args.output_filename:
train_csv_file = open(args.output_filename, 'w', newline='')
train_csv_writer = csv.writer(train_csv_file, delimiter=',')
train_csv_writer.writerow(['frames','fps','total_time',
'rmean','rmedian','rmin','rmax','rstd',
'lmean','lmedian','lmin','lmax','lstd',
'entropy','value_loss','policy_loss'])
eval_output_filename = '.'.join([''.join(args.output_filename.split('.')[:-1] + ['_test']), 'csv'])
eval_csv_file = open(eval_output_filename, 'w', newline='')
eval_csv_file.write(json.dumps(vars(args)))
eval_csv_file.write('\n')
eval_csv_writer = csv.writer(eval_csv_file, delimiter=',')
eval_csv_writer.writerow(['frames','total_time',
'rmean','rmedian','rmin','rmax','rstd',
'lmean','lmedian','lmin','lmax','lstd'])
else:
train_csv_file, train_csv_writer = None, None
eval_csv_file, eval_csv_writer = None, None
if args.plot:
from tensorboardX import SummaryWriter
current_time = datetime.now().strftime('%b%d_%H-%M-%S')
log_dir = os.path.join(args.log_dir, current_time + '_' + socket.gethostname())
writer = SummaryWriter(log_dir=log_dir)
for k, v in vars(args).items():
writer.add_text(k, str(v))
print()
print('PyTorch : {}'.format(torch.__version__))
print('CUDA : {}'.format(torch.backends.cudnn.m.cuda))
print('CUDNN : {}'.format(torch.backends.cudnn.version()))
print('APEX : {}'.format('.'.join([str(i) for i in apex.amp.__version__.VERSION])))
print()
if train_device.type == 'cuda':
print(cuda_device_str(train_device.index), flush=True)
if args.use_openai:
train_env = create_vectorize_atari_env(args.env_name, args.seed, args.num_ales,
episode_life=args.episodic_life, clip_rewards=False,
max_frames=args.max_episode_length)
observation = torch.from_numpy(train_env.reset()).squeeze(1)
else:
train_env = AtariEnv(args.env_name, args.num_ales, color_mode='gray', repeat_prob=0.0,
device=env_device, rescale=True, episodic_life=args.episodic_life,
clip_rewards=False, frameskip=4)
train_env.train()
observation = train_env.reset(initial_steps=args.ale_start_steps, verbose=args.verbose).squeeze(-1)
if args.use_openai_test_env:
test_env = create_vectorize_atari_env(args.env_name, args.seed, args.evaluation_episodes,
episode_life=False, clip_rewards=False)
test_env.reset()
else:
test_env = AtariEnv(args.env_name, args.evaluation_episodes, color_mode='gray', repeat_prob=0.0,
device='cpu', rescale=True, episodic_life=False, clip_rewards=False, frameskip=4)
model = ActorCritic(args.num_stack, train_env.action_space, normalize=args.normalize, name=args.env_name)
model = model.to(train_device).train()
if args.rank == 0:
print(model)
args.model_name = model.name()
if args.use_adam:
optimizer = optim.Adam(model.parameters(), lr=args.lr, amsgrad=True)
else:
optimizer = optim.RMSprop(model.parameters(), lr=args.lr, eps=args.eps, alpha=args.alpha)
model, optimizer = amp.initialize(model, optimizer,
opt_level=args.opt_level,
loss_scale=args.loss_scale
)
if args.distributed:
model = DDP(model, delay_allreduce=True)
num_frames_per_iter = args.num_ales * args.num_steps
total_steps = math.ceil(args.t_max / (args.world_size * num_frames_per_iter))
shape = (args.num_steps + 1, args.num_ales, args.num_stack, *train_env.observation_space.shape[-2:])
states = torch.zeros(shape, device=train_device, dtype=torch.float32)
states[0, :, -1] = observation.to(device=train_device, dtype=torch.float32)
shape = (args.num_steps + 1, args.num_ales)
values = torch.zeros(shape, device=train_device, dtype=torch.float32)
returns = torch.zeros(shape, device=train_device, dtype=torch.float32)
shape = (args.num_steps, args.num_ales)
rewards = torch.zeros(shape, device=train_device, dtype=torch.float32)
masks = torch.zeros(shape, device=train_device, dtype=torch.float32)
actions = torch.zeros(shape, device=train_device, dtype=torch.long)
# These variables are used to compute average rewards for all processes.
episode_rewards = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
final_rewards = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
episode_lengths = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
final_lengths = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
if args.use_gae:
gae = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
maybe_npy = lambda a: a.numpy() if args.use_openai else a
torch.cuda.synchronize()
iterator = range(total_steps)
if args.rank == 0:
iterator = tqdm(iterator)
total_time = 0
evaluation_offset = 0
for update in iterator:
T = args.world_size * update * num_frames_per_iter
if (args.rank == 0) and (T >= evaluation_offset):
evaluation_offset += args.evaluation_interval
eval_lengths, eval_rewards = evaluate(args, T, total_time, model, test_env, eval_csv_writer, eval_csv_file)
if args.plot:
writer.add_scalar('eval/rewards_mean', eval_rewards.mean().item(), T, walltime=total_time)
writer.add_scalar('eval/lengths_mean', eval_lengths.mean().item(), T, walltime=total_time)
start_time = time.time()
with torch.no_grad():
for step in range(args.num_steps):
value, logit = model(states[step])
# store values
values[step] = value.squeeze(-1)
# convert actions to numpy and perform next step
probs_action = F.softmax(logit, dim=1).multinomial(1).to(env_device)
observation, reward, done, info = train_env.step(maybe_npy(probs_action))
if args.use_openai:
# convert back to pytorch tensors
observation = torch.from_numpy(observation)
reward = torch.from_numpy(reward)
done = torch.from_numpy(done.astype(np.uint8))
else:
observation = observation.squeeze(-1).unsqueeze(1)
# move back to training memory
observation = observation.to(device=train_device)
reward = reward.to(device=train_device, dtype=torch.float32)
done = done.to(device=train_device)
probs_action = probs_action.to(device=train_device, dtype=torch.long)
not_done = 1.0 - done.float()
# update rewards and actions
actions[step].copy_(probs_action.view(-1))
masks[step].copy_(not_done)
rewards[step].copy_(reward.sign())
# update next observations
states[step + 1, :, :-1].copy_(states[step, :, 1:].clone())
states[step + 1] *= not_done.view(-1, *[1] * (observation.dim() - 1))
states[step + 1, :, -1].copy_(observation.view(-1, *states.size()[-2:]))
# update episodic reward counters
episode_rewards += reward
final_rewards[done] = episode_rewards[done]
episode_rewards *= not_done
episode_lengths += not_done
final_lengths[done] = episode_lengths[done]
episode_lengths *= not_done
returns[-1] = values[-1] = model(states[-1])[0].data.squeeze(-1)
if args.use_gae:
gae.zero_()
for step in reversed(range(args.num_steps)):
delta = rewards[step] + (args.gamma * values[step + 1] * masks[step]) - values[step]
gae = delta + (args.gamma * args.tau * masks[step] * gae)
returns[step] = gae + values[step]
else:
for step in reversed(range(args.num_steps)):
returns[step] = rewards[step] + (args.gamma * returns[step + 1] * masks[step])
value, logit = model(states[:-1].view(-1, *states.size()[-3:]))
log_probs = F.log_softmax(logit, dim=1)
probs = F.softmax(logit, dim=1)
action_log_probs = log_probs.gather(1, actions.view(-1).unsqueeze(-1))
dist_entropy = -(log_probs * probs).sum(-1).mean()
advantages = returns[:-1].view(-1).unsqueeze(-1) - value
value_loss = advantages.pow(2).mean()
policy_loss = -(advantages.clone().detach() * action_log_probs).mean()
loss = value_loss * args.value_loss_coef + policy_loss - dist_entropy * args.entropy_coef
optimizer.zero_grad()
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), args.max_grad_norm)
optimizer.step()
states[0].copy_(states[-1])
torch.cuda.synchronize()
if args.rank == 0:
iter_time = time.time() - start_time
total_time += iter_time
if args.plot:
writer.add_scalar('train/rewards_mean', final_rewards.mean().item(), T, walltime=total_time)
writer.add_scalar('train/lengths_mean', final_lengths.mean().item(), T, walltime=total_time)
writer.add_scalar('train/learning_rate', scheduler.get_lr()[0], T, walltime=total_time)
writer.add_scalar('train/value_loss', value_loss, T, walltime=total_time)
writer.add_scalar('train/policy_loss', policy_loss, T, walltime=total_time)
writer.add_scalar('train/entropy', dist_entropy, T, walltime=total_time)
progress_data = callback(args, model, T, iter_time, final_rewards, final_lengths,
value_loss.item(), policy_loss.item(), dist_entropy.item(),
train_csv_writer, train_csv_file)
iterator.set_postfix_str(progress_data)
if args.plot:
writer.close()
if args.use_openai:
train_env.close()
if args.use_openai_test_env:
test_env.close()
parser.add_argument('--initial-steps', type=int, default=1000, help='Number of steps used to initialize the environment')
parser.add_argument('--num-envs', type=int, default=5, help='Number of atari environments')
parser.add_argument('--rescale', action='store_true', help='Resize output frames to 84x84 using bilinear interpolation')
parser.add_argument('--training', action='store_true', help='Set environment to training mode')
parser.add_argument('--use-cuda', action='store_true', help='Execute ALEs on GPU')
parser.add_argument('--use-openai', action='store_true', default=False, help='Use OpenAI Gym environment')
args = parser.parse_args()
cmap = None if args.color == 'rgb' else 'gray'
device = torch.device('cuda:{}'.format(args.gpu) if args.use_cuda else 'cpu')
debug = args.debug
num_actions = 4
num_envs = args.num_envs
if args.use_openai:
env = create_vectorize_atari_env(args.env_name, seed=0, num_envs=args.num_envs,
episode_life=False, clip_rewards=False)
observations = env.reset()
else:
env = Env(args.env_name, args.num_envs, args.color, device=device,
rescale=args.rescale, episodic_life=True, repeat_prob=0.0)
print(env.cart)
if args.training:
env.train()
observations = env.reset(initial_steps=args.initial_steps, verbose=True).cpu().numpy()
fig = plt.figure()
img = plt.imshow(np.squeeze(np.hstack(observations)), animated=True, cmap=cmap)
ax = fig.add_subplot(111)
frame = 0
def worker(gpu, ngpus_per_node, callback, args):
args.gpu = gpu
if args.distributed:
args.seed += args.gpu
torch.cuda.set_device(args.gpu)
args.rank = int(os.environ['RANK']) if 'RANK' in os.environ else 0
if args.multiprocessing_distributed:
args.rank = args.rank * ngpus_per_node + args.gpu
torch.distributed.init_process_group(
backend='nccl',
init_method='tcp://127.0.0.1:8632',
world_size=args.world_size,
rank=args.rank)
else:
args.rank = 0
if (args.num_ales % args.num_minibatches) != 0:
raise ValueError(
'Number of ales({}) size is not even divisible by the minibatch size({})'
.format(args.num_ales, args.num_minibatches))
if args.num_steps_per_update == -1:
args.num_steps_per_update = args.num_steps
minibatch_size = int(args.num_ales / args.num_minibatches)
step0 = args.num_steps - args.num_steps_per_update
n_minibatch = -1
args.use_cuda_env = args.use_cuda_env and torch.cuda.is_available()
args.no_cuda_train = (not args.no_cuda_train) and torch.cuda.is_available()
args.verbose = args.verbose and (args.rank == 0)
env_device = torch.device(
'cuda', args.gpu) if args.use_cuda_env else torch.device('cpu')
train_device = torch.device('cuda', args.gpu) if (
args.no_cuda_train == False) else torch.device('cpu')
np.random.seed(args.seed)
torch.manual_seed(np.random.randint(1, 10000))
if args.use_cuda_env or (args.no_cuda_train == False):
torch.cuda.manual_seed(np.random.randint(1, 10000))
if args.rank == 0:
if args.output_filename:
train_csv_file = open(args.output_filename, 'w', newline='')
train_csv_file.write(json.dumps(vars(args)))
train_csv_file.write('\n')
train_csv_writer = csv.writer(train_csv_file, delimiter=',')
train_csv_writer.writerow([
'frames', 'fps', 'total_time', 'rmean', 'rmedian', 'rmin',
'rmax', 'lmean', 'lmedian', 'lmin', 'lmax', 'entropy',
'value_loss', 'policy_loss'
])
eval_output_filename = '.'.join([
''.join(args.output_filename.split('.')[:-1] + ['_test']),
'csv'
])
eval_csv_file = open(eval_output_filename, 'w', newline='')
eval_csv_file.write(json.dumps(vars(args)))
eval_csv_file.write('\n')
eval_csv_writer = csv.writer(eval_csv_file, delimiter=',')
eval_csv_writer.writerow([
'frames', 'total_time', 'rmean', 'rmedian', 'rmin', 'rmax',
'rstd', 'lmean', 'lmedian', 'lmin', 'lmax', 'lstd'
])
else:
train_csv_file, train_csv_writer = None, None
eval_csv_file, eval_csv_writer = None, None
if args.plot:
from tensorboardX import SummaryWriter
current_time = datetime.now().strftime('%b%d_%H-%M-%S')
log_dir = os.path.join(args.log_dir,
current_time + '_' + socket.gethostname())
writer = SummaryWriter(log_dir=log_dir)
for k, v in vars(args).items():
writer.add_text(k, str(v))
print()
print('PyTorch : {}'.format(torch.__version__))
print('CUDA : {}'.format(torch.backends.cudnn.m.cuda))
print('CUDNN : {}'.format(torch.backends.cudnn.version()))
print('APEX : {}'.format('.'.join(
[str(i) for i in apex.amp.__version__.VERSION])))
print()
if train_device.type == 'cuda':
print(cuda_device_str(train_device.index), flush=True)
if args.use_openai:
train_env = create_vectorize_atari_env(
args.env_name,
args.seed,
args.num_ales,
episode_life=args.episodic_life,
clip_rewards=False,
max_frames=args.max_episode_length)
observation = torch.from_numpy(train_env.reset()).squeeze(1)
else:
train_env = AtariEnv(args.env_name,
args.num_ales,
color_mode='gray',
repeat_prob=0.0,
device=env_device,
rescale=True,
episodic_life=args.episodic_life,
clip_rewards=False,
frameskip=4)
train_env.train()
observation = train_env.reset(initial_steps=args.ale_start_steps,
verbose=args.verbose).squeeze(-1)
if args.use_openai_test_env:
test_env = create_vectorize_atari_env(args.env_name,
args.seed,
args.evaluation_episodes,
episode_life=False,
clip_rewards=False)
test_env.reset()
else:
test_env = AtariEnv(args.env_name,
args.evaluation_episodes,
color_mode='gray',
repeat_prob=0.0,
device='cpu',
rescale=True,
episodic_life=False,
clip_rewards=False,
frameskip=4)
model = ActorCritic(args.num_stack,
train_env.action_space,
normalize=args.normalize,
name=args.env_name)
model = model.to(train_device).train()
if args.rank == 0:
print(model)
args.model_name = model.name
if args.use_adam:
optimizer = optim.Adam(model.parameters(), lr=args.lr, amsgrad=True)
else:
optimizer = optim.RMSprop(model.parameters(),
lr=args.lr,
eps=args.eps,
alpha=args.alpha)
# This is the number of frames GENERATED between two updates
num_frames_per_iter = args.num_ales * args.num_steps_per_update
total_steps = math.ceil(args.t_max /
(args.world_size * num_frames_per_iter))
model, optimizer = amp.initialize(model,
optimizer,
opt_level=args.opt_level,
loss_scale=args.loss_scale)
if args.distributed:
model = DDP(model, delay_allreduce=True)
shape = (args.num_steps + 1, args.num_ales, args.num_stack,
*train_env.observation_space.shape[-2:])
states = torch.zeros(shape, device=train_device, dtype=torch.float32)
states[step0, :, -1] = observation.to(device=train_device,
dtype=torch.float32)
shape = (args.num_steps + 1, args.num_ales)
values = torch.zeros(shape, device=train_device, dtype=torch.float32)
logits = torch.zeros(
(args.num_steps + 1, args.num_ales, train_env.action_space.n),
device=train_device,
dtype=torch.float32)
returns = torch.zeros(shape, device=train_device, dtype=torch.float32)
shape = (args.num_steps, args.num_ales)
rewards = torch.zeros(shape, device=train_device, dtype=torch.float32)
masks = torch.zeros(shape, device=train_device, dtype=torch.float32)
actions = torch.zeros(shape, device=train_device, dtype=torch.long)
mus = torch.ones(shape, device=train_device, dtype=torch.float32)
# pis = torch.zeros(shape, device=train_device, dtype=torch.float32)
rhos = torch.zeros((args.num_steps, minibatch_size),
device=train_device,
dtype=torch.float32)
# These variables are used to compute average rewards for all processes.
episode_rewards = torch.zeros(args.num_ales,
device=train_device,
dtype=torch.float32)
final_rewards = torch.zeros(args.num_ales,
device=train_device,
dtype=torch.float32)
episode_lengths = torch.zeros(args.num_ales,
device=train_device,
dtype=torch.float32)
final_lengths = torch.zeros(args.num_ales,
device=train_device,
dtype=torch.float32)
if args.use_gae:
raise ValueError('GAE is not compatible with VTRACE')
maybe_npy = lambda a: a.numpy() if args.use_openai else a
torch.cuda.synchronize()
iterator = range(total_steps)
if args.rank == 0:
iterator = tqdm(iterator)
total_time = 0
evaluation_offset = 0
for update in iterator:
T = args.world_size * update * num_frames_per_iter
if (args.rank == 0) and (T >= evaluation_offset):
evaluation_offset += args.evaluation_interval
eval_lengths, eval_rewards = evaluate(args, T, total_time, model,
test_env, eval_csv_writer,
eval_csv_file)
if args.plot:
writer.add_scalar('eval/rewards_mean',
eval_rewards.mean().item(),
T,
walltime=total_time)
writer.add_scalar('eval/lengths_mean',
eval_lengths.mean().item(),
T,
walltime=total_time)
start_time = time.time()
with torch.no_grad():
for step in range(args.num_steps_per_update):
nvtx.range_push('train:step')
value, logit = model(states[step0 + step])
# store values and logits
values[step0 + step] = value.squeeze(-1)
# convert actions to numpy and perform next step
probs = torch.clamp(F.softmax(logit, dim=1),
min=0.00001,
max=0.99999)
probs_action = probs.multinomial(1).to(env_device)
# Check if the multinomial threw an exception
# https://github.com/pytorch/pytorch/issues/7014
torch.cuda.current_stream().synchronize()
observation, reward, done, info = train_env.step(
maybe_npy(probs_action))
if args.use_openai:
# convert back to pytorch tensors
observation = torch.from_numpy(observation)
reward = torch.from_numpy(reward)
done = torch.from_numpy(done.astype(np.uint8))
else:
observation = observation.squeeze(-1).unsqueeze(1)
# move back to training memory
observation = observation.to(device=train_device)
reward = reward.to(device=train_device, dtype=torch.float32)
done = done.to(device=train_device)
probs_action = probs_action.to(device=train_device,
dtype=torch.long)
not_done = 1.0 - done.float()
# update rewards and actions
actions[step0 + step].copy_(probs_action.view(-1))
masks[step0 + step].copy_(not_done)
rewards[step0 + step].copy_(reward.sign())
#mus[step0 + step] = F.softmax(logit, dim=1).gather(1, actions[step0 + step].view(-1).unsqueeze(-1)).view(-1)
mus[step0 + step] = torch.clamp(F.softmax(logit, dim=1).gather(
1, actions[step0 + step].view(-1).unsqueeze(-1)).view(-1),
min=0.00001,
max=0.99999)
# update next observations
states[step0 + step + 1, :, :-1].copy_(states[step0 + step, :,
1:])
states[step0 + step + 1] *= not_done.view(
-1, *[1] * (observation.dim() - 1))
states[step0 + step + 1, :,
-1].copy_(observation.view(-1,
*states.size()[-2:]))
# update episodic reward counters
episode_rewards += reward
final_rewards[done] = episode_rewards[done]
episode_rewards *= not_done
episode_lengths += not_done
final_lengths[done] = episode_lengths[done]
episode_lengths *= not_done
nvtx.range_pop()
n_minibatch = (n_minibatch + 1) % args.num_minibatches
min_ale_index = int(n_minibatch * minibatch_size)
max_ale_index = min_ale_index + minibatch_size
# compute v-trace using the recursive method (remark 1 in IMPALA paper)
# value_next_step, logit = model(states[-1:, min_ale_index:max_ale_index, :, : ,:].contiguous().view(-1, *states.size()[-3:]))
# returns[-1, min_ale_index:max_ale_index] = value_next_step.squeeze()
# for step in reversed(range(args.num_steps)):
# value, logit = model(states[step, min_ale_index:max_ale_index, :, : ,:].contiguous().view(-1, *states.size()[-3:]))
# pis = F.softmax(logit, dim=1).gather(1, actions[step, min_ale_index:max_ale_index].view(-1).unsqueeze(-1)).view(-1)
# c = torch.clamp(pis / mus[step, min_ale_index:max_ale_index], max=c_)
# rhos[step, :] = torch.clamp(pis / mus[step, min_ale_index:max_ale_index], max=rho_)
# delta_value = rhos[step, :] * (rewards[step, min_ale_index:max_ale_index] + (args.gamma * value_next_step - value).squeeze())
# returns[step, min_ale_index:max_ale_index] = value.squeeze() + delta_value + args.gamma * c * \
# (returns[step + 1, min_ale_index:max_ale_index] - value_next_step.squeeze())
# value_next_step = value
nvtx.range_push('train:compute_values')
value, logit = model(
states[:, min_ale_index:max_ale_index, :, :, :].contiguous().view(
-1,
*states.size()[-3:]))
batch_value = value.detach().view((args.num_steps + 1, minibatch_size))
batch_probs = F.softmax(logit.detach()[:(args.num_steps *
minibatch_size), :],
dim=1)
batch_pis = batch_probs.gather(
1, actions[:, min_ale_index:max_ale_index].contiguous().view(
-1).unsqueeze(-1)).view((args.num_steps, minibatch_size))
returns[-1, min_ale_index:max_ale_index] = batch_value[-1]
with torch.no_grad():
for step in reversed(range(args.num_steps)):
c = torch.clamp(batch_pis[step, :] /
mus[step, min_ale_index:max_ale_index],
max=args.c_hat)
rhos[step, :] = torch.clamp(
batch_pis[step, :] /
mus[step, min_ale_index:max_ale_index],
max=args.rho_hat)
delta_value = rhos[step, :] * (
rewards[step, min_ale_index:max_ale_index] +
(args.gamma * batch_value[step + 1] -
batch_value[step]).squeeze())
returns[step, min_ale_index:max_ale_index] = \
batch_value[step, :].squeeze() + delta_value + args.gamma * c * \
(returns[step + 1, min_ale_index:max_ale_index] - batch_value[step + 1, :].squeeze())
value = value[:args.num_steps * minibatch_size, :]
logit = logit[:args.num_steps * minibatch_size, :]
log_probs = F.log_softmax(logit, dim=1)
probs = F.softmax(logit, dim=1)
action_log_probs = log_probs.gather(
1, actions[:, min_ale_index:max_ale_index].contiguous().view(
-1).unsqueeze(-1))
dist_entropy = -(log_probs * probs).sum(-1).mean()
advantages = returns[:-1, min_ale_index:max_ale_index].contiguous(
).view(-1).unsqueeze(-1) - value
value_loss = advantages.pow(2).mean()
policy_loss = -(action_log_probs * rhos.view(-1, 1).detach() * \
(rewards[:, min_ale_index:max_ale_index].contiguous().view(-1, 1) + args.gamma * \
returns[1:, min_ale_index:max_ale_index].contiguous().view(-1, 1) - value).detach()).mean()
nvtx.range_pop()
nvtx.range_push('train:backprop')
loss = value_loss * args.value_loss_coef + policy_loss - dist_entropy * args.entropy_coef
optimizer.zero_grad()
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer),
args.max_grad_norm)
optimizer.step()
nvtx.range_pop()
nvtx.range_push('train:next_states')
for step in range(0, args.num_steps_per_update):
states[:-1, :, :, :, :] = states[1:, :, :, :, :]
rewards[:-1, :] = rewards[1:, :]
actions[:-1, :] = actions[1:, :]
masks[:-1, :] = masks[1:, :]
mus[:-1, :] = mus[1:, :]
nvtx.range_pop()
torch.cuda.synchronize()
if args.rank == 0:
iter_time = time.time() - start_time
total_time += iter_time
if args.plot:
writer.add_scalar('train/rewards_mean',
final_rewards.mean().item(),
T,
walltime=total_time)
writer.add_scalar('train/lengths_mean',
final_lengths.mean().item(),
T,
walltime=total_time)
writer.add_scalar('train/value_loss',
value_loss,
T,
walltime=total_time)
writer.add_scalar('train/policy_loss',
policy_loss,
T,
walltime=total_time)
writer.add_scalar('train/entropy',
dist_entropy,
T,
walltime=total_time)
progress_data = callback(args, model, T, iter_time, final_rewards,
final_lengths, value_loss, policy_loss,
dist_entropy, train_csv_writer,
train_csv_file)
iterator.set_postfix_str(progress_data)
if args.plot and (args.rank == 0):
writer.close()
if args.use_openai:
train_env.close()
if args.use_openai_test_env:
test_env.close()
def worker(gpu, ngpus_per_node, args):
args.gpu = gpu
if args.distributed:
args.seed += args.gpu
torch.cuda.set_device(args.gpu)
args.rank = int(os.environ['RANK']) if 'RANK' in os.environ else 0
if args.multiprocessing_distributed:
args.rank = args.rank * ngpus_per_node + args.gpu
torch.distributed.init_process_group(backend='nccl', init_method='tcp://127.0.0.1:8632',
world_size=args.world_size, rank=args.rank)
else:
args.rank = 0
args.use_cuda_env = args.use_cuda_env and torch.cuda.is_available()
args.no_cuda_train = not torch.cuda.is_available()
args.verbose = args.verbose and (args.rank == 0)
env_device = torch.device('cuda', args.gpu) if args.use_cuda_env else torch.device('cpu')
train_device = torch.device('cuda', args.gpu) if (args.no_cuda_train == False) else torch.device('cpu')
# Setup
np.random.seed(args.seed)
torch.manual_seed(np.random.randint(1, 10000))
if args.use_cuda_env or (args.no_cuda_train == False):
torch.cuda.manual_seed(random.randint(1, 10000))
if train_device.type == 'cuda':
print('Train:\n' + cuda_device_str(train_device.index), flush=True)
if args.use_openai:
test_env = create_vectorize_atari_env(args.env_name, args.seed, args.evaluation_episodes,
episode_life=False, clip_rewards=False)
test_env.reset()
else:
test_env = AtariEnv(args.env_name, args.evaluation_episodes, color_mode='gray',
device='cpu', rescale=True, clip_rewards=False,
episodic_life=False, repeat_prob=0.0, frameskip=4)
# Agent
dqn = Agent(args, test_env.action_space)
# Construct validation memory
if args.rank == 0:
print(dqn)
print('Initializing evaluation memory with {} entries...'.format(args.evaluation_size), end='', flush=True)
start_time = time.time()
val_mem = initialize_validation(args, train_device)
if args.rank == 0:
print('complete ({})'.format(format_time(time.time() - start_time)), flush=True)
if args.evaluate:
if args.rank == 0:
eval_start_time = time.time()
dqn.eval() # Set DQN (online network) to evaluation mode
rewards, lengths, avg_Q = test(args, 0, dqn, val_mem, test_env, train_device)
dqn.train() # Set DQN (online network) back to training mode
eval_total_time = time.time() - eval_start_time
rmean, rmedian, rstd, rmin, rmax = vec_stats(rewards)
lmean, lmedian, lstd, lmin, lmax = vec_stats(lengths)
print('reward: {:4.2f}, {:4.0f}, {:4.0f}, {:4.4f} | '
'length: {:4.2f}, {:4.0f}, {:4.0f}, {:4.4f} | '
'Avg. Q: {:4.4f} | {}'
.format(rmean, rmin, rmax, rstd, lmean, lmin, lmax,
lstd, avg_Q, format_time(eval_total_time)),
flush=True)
else:
if args.rank == 0:
print('Entering main training loop', flush=True)
if args.output_filename:
csv_file = open(args.output_filename, 'w', newline='')
csv_file.write(json.dumps(vars(args)))
csv_file.write('\n')
csv_writer = csv.writer(csv_file, delimiter=',')
csv_writer.writerow(['frames', 'total_time',
'rmean', 'rmedian', 'rstd', 'rmin', 'rmax',
'lmean', 'lmedian', 'lstd', 'lmin', 'lmax'])
else:
csv_writer, csv_file = None, None
if args.plot:
from tensorboardX import SummaryWriter
current_time = datetime.now().strftime('%b%d_%H-%M-%S')
log_dir = os.path.join(args.log_dir, current_time + '_' + socket.gethostname())
writer = SummaryWriter(log_dir=log_dir)
for k, v in vars(args).items():
writer.add_text(k, str(v))
# Environment
print('Initializing environments...', end='', flush=True)
start_time = time.time()
if args.use_openai:
train_env = create_vectorize_atari_env(args.env_name, args.seed, args.num_ales,
episode_life=True, clip_rewards=args.reward_clip,
max_frames=args.max_episode_length)
observation = torch.from_numpy(train_env.reset()).squeeze(1)
else:
train_env = AtariEnv(args.env_name, args.num_ales, color_mode='gray',
device=env_device, rescale=True,
clip_rewards=args.reward_clip,
episodic_life=True, repeat_prob=0.0)
train_env.train()
observation = train_env.reset(initial_steps=args.ale_start_steps, verbose=args.verbose).clone().squeeze(-1)
if args.rank == 0:
print('complete ({})'.format(format_time(time.time() - start_time)), flush=True)
# These variables are used to compute average rewards for all processes.
episode_rewards = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
episode_lengths = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
final_rewards = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
final_lengths = torch.zeros(args.num_ales, device=train_device, dtype=torch.float32)
has_completed = torch.zeros(args.num_ales, device=train_device, dtype=torch.bool)
mem = ReplayMemory(args, args.memory_capacity, train_device)
mem.reset(observation)
priority_weight_increase = (1 - args.priority_weight) / (args.t_max - args.learn_start)
state = torch.zeros((args.num_ales, args.history_length, 84, 84), device=mem.device, dtype=torch.float32)
state[:, -1] = observation.to(device=mem.device, dtype=torch.float32).div(255.0)
num_frames_per_iter = args.num_ales
total_steps = math.ceil(args.t_max / (args.world_size * num_frames_per_iter))
epsilons = np.linspace(args.epsilon_start, args.epsilon_final, math.ceil(args.epsilon_frames / num_frames_per_iter))
epsilon_offset = math.ceil(args.learn_start / num_frames_per_iter)
prefetcher = data_prefetcher(args.batch_size, train_device, mem)
avg_loss = 'N/A'
eval_offset = 0
target_update_offset = 0
total_time = 0
# main loop
iterator = range(total_steps)
if args.rank == 0:
iterator = tqdm(iterator)
env_stream = torch.cuda.Stream()
train_stream = torch.cuda.Stream()
for update in iterator:
T = args.world_size * update * num_frames_per_iter
epsilon = epsilons[min(update - epsilon_offset, len(epsilons) - 1)] if T >= args.learn_start else epsilons[0]
start_time = time.time()
if update % args.replay_frequency == 0:
dqn.reset_noise() # Draw a new set of noisy weights
dqn.eval()
nvtx.range_push('train:select action')
if args.noisy_linear:
action = dqn.act(state) # Choose an action greedily (with noisy weights)
else:
action = dqn.act_e_greedy(state, epsilon=epsilon)
nvtx.range_pop()
dqn.train()
if args.use_openai:
action = action.cpu().numpy()
torch.cuda.synchronize()
with torch.cuda.stream(env_stream):
nvtx.range_push('train:env step')
observation, reward, done, info = train_env.step(action) # Step
if args.use_openai:
# convert back to pytorch tensors
observation = torch.from_numpy(observation).squeeze(1)
reward = torch.from_numpy(reward.astype(np.float32))
done = torch.from_numpy(done.astype(np.bool))
action = torch.from_numpy(action)
else:
observation = observation.clone().squeeze(-1)
nvtx.range_pop()
observation = observation.to(device=train_device)
reward = reward.to(device=train_device)
done = done.to(device=train_device, dtype=torch.bool)
action = action.to(device=train_device)
observation = observation.float().div_(255.0)
not_done = 1.0 - done.float()
state[:, :-1].copy_(state[:, 1:].clone())
state *= not_done.view(-1, 1, 1, 1)
state[:, -1].copy_(observation)
# update episodic reward counters
has_completed |= done
episode_rewards += reward.float()
final_rewards[done] = episode_rewards[done]
episode_rewards *= not_done
episode_lengths += not_done
final_lengths[done] = episode_lengths[done]
episode_lengths *= not_done
# Train and test
if T >= args.learn_start:
mem.priority_weight = min(mem.priority_weight + priority_weight_increase, 1) # Anneal importance sampling weight β to 1
prefetcher.preload()
avg_loss = 0.0
num_minibatches = min(int(args.num_ales / args.replay_frequency), 8)
for _ in range(num_minibatches):
# Sample transitions
nvtx.range_push('train:sample states')
idxs, states, actions, returns, next_states, nonterminals, weights = prefetcher.next()
nvtx.range_pop()
nvtx.range_push('train:network update')
loss = dqn.learn(states, actions, returns, next_states, nonterminals, weights)
nvtx.range_pop()
nvtx.range_push('train:update priorities')
mem.update_priorities(idxs, loss) # Update priorities of sampled transitions
nvtx.range_pop()
avg_loss += loss.mean().item()
avg_loss /= num_minibatches
# Update target network
if T >= target_update_offset:
dqn.update_target_net()
target_update_offset += args.target_update
torch.cuda.current_stream().wait_stream(env_stream)
torch.cuda.current_stream().wait_stream(train_stream)
nvtx.range_push('train:append memory')
mem.append(observation, action, reward, done) # Append transition to memory
nvtx.range_pop()
total_time += time.time() - start_time
if args.rank == 0:
if args.plot and ((update % args.replay_frequency) == 0):
writer.add_scalar('train/epsilon', epsilon, T)
writer.add_scalar('train/rewards', final_rewards.mean(), T)
writer.add_scalar('train/lengths', final_lengths.mean(), T)
if T >= eval_offset:
eval_start_time = time.time()
dqn.eval() # Set DQN (online network) to evaluation mode
rewards, lengths, avg_Q = test(args, T, dqn, val_mem, test_env, train_device)
dqn.train() # Set DQN (online network) back to training mode
eval_total_time = time.time() - eval_start_time
eval_offset += args.evaluation_interval
rmean, rmedian, rstd, rmin, rmax = vec_stats(rewards)
lmean, lmedian, lstd, lmin, lmax = vec_stats(lengths)
print('reward: {:4.2f}, {:4.0f}, {:4.0f}, {:4.4f} | '
'length: {:4.2f}, {:4.0f}, {:4.0f}, {:4.4f} | '
'Avg. Q: {:4.4f} | {}'
.format(rmean, rmin, rmax, rstd, lmean, lmin, lmax,
lstd, avg_Q, format_time(eval_total_time)),
flush=True)
if args.output_filename and csv_writer and csv_file:
csv_writer.writerow([T, total_time,
rmean, rmedian, rstd, rmin, rmax,
lmean, lmedian, lstd, lmin, lmax])
csv_file.flush()
if args.plot:
writer.add_scalar('eval/rewards', rmean, T)
writer.add_scalar('eval/lengths', lmean, T)
writer.add_scalar('eval/avg_Q', avg_Q, T)
loss_str = '{:4.4f}'.format(avg_loss) if isinstance(avg_loss, float) else avg_loss
progress_data = 'T = {:,} epsilon = {:4.2f} avg reward = {:4.2f} loss: {}' \
.format(T, epsilon, final_rewards.mean().item(), loss_str)
iterator.set_postfix_str(progress_data)
if args.plot and (args.rank == 0):
writer.close()
if args.use_openai:
train_env.close()
test_env.close()