def load_policy_model(args, environment, device, folder=None):
parent_folder = './checkpoint/policy'
path = folder if folder is not None else parent_folder
model = Policy(environment['action'],
net=args.encoder,
pretrained=args.pretrained,
input=environment['input_size'])
model.load_state_dict(torch.load(f'{path}/best_model.ckpt'))
model = model.to(device)
model.eval()
return model
# Model and action size
print('\nCreating Models')
action_dimension = environment['action']
inputs = environment['input_size'] * 2 if environment[
'input_size'] is not None else None
policy_model = Policy(action_dimension,
net=args.encoder,
pretrained=args.pretrained,
input=environment['input_size'])
idm_model = IDM(action_dimension,
net=args.encoder,
pretrained=args.pretrained,
input=inputs)
policy_model.to(device)
idm_model.to(device)
# Optimizer and loss
print('\nCreating Optimizer and Loss')
print(f'IDM learning rate: {args.lr}\nPolicy learning rate: {args.policy_lr}')
idm_lr = args.lr
idm_criterion = nn.CrossEntropyLoss()
idm_optimizer = optim.Adam(idm_model.parameters(), lr=idm_lr)
policy_lr = args.policy_lr
policy_criterion = nn.CrossEntropyLoss()
policy_optimizer = optim.Adam(policy_model.parameters(), lr=policy_lr)
# Learning rate decay
print('Setting up Learning Rate Decay function and Schedulers')
class Agent:
#algorithm
algo = 'a2c' #a2c, ppo, acktr
use_gae = False #generalized advantage estimation
gae_lambda = 0.95
entropy_coef = 0.01 #weight maximizing action entropy loss
value_loss_coef = 0.1 #.5 #weight value function loss
max_grad_norm = 0.5 #max norm of gradients
#ppo hyperparameters
clip_param = 0.2 #ppo clip
num_steps = 5 #steps before an update
ppo_epoch = 4
num_mini_batch = 32
seed = 1
device = 'cuda' if torch.cuda.is_available() else 'cpu'
cuda_deterministic = False
no_cuda = False
use_proper_time_limits = False
use_linear_lr_decay = False
#experimnent setup
log_interval = 1 #log per n updates
log_dir = os.path.expanduser('/tmp/gym')
eval_log_dir = log_dir + "_eval"
save_interval = 100
eval_interval = None
recurrent_policy = True
#optimization, RMSprop and TD
eps = 1e-5 #epsilon
alpha = 0.99
gamma = 0.99 #discount factor
#imitation learning with gail
gail_batch_size = 128
gail_epoch = 5
def __init__(self,
env_def,
processes=1,
dir='.',
version=0,
lr=2e-4,
architecture='base',
dropout=0,
reconstruct=None,
r_weight=.05):
self.env_def = env_def
self.num_processes = processes #cpu processes
self.lr = lr
self.version = version
self.save_dir = dir + '/trained_models/'
#Setup
pathlib.Path(self.save_dir).mkdir(parents=True, exist_ok=True)
if (self.num_mini_batch > processes):
self.num_mini_batch = processes
self.writer = SummaryWriter()
self.total_steps = 0
#State
torch.manual_seed(self.seed)
torch.cuda.manual_seed_all(self.seed)
if not self.no_cuda and torch.cuda.is_available(
) and self.cuda_deterministic:
torch.backends.cudnn.benchmark = False
torch.backends.cudnn.deterministic = True
utils.cleanup_log_dir(self.log_dir)
utils.cleanup_log_dir(self.eval_log_dir)
torch.set_num_threads(1)
self.level_path = None
self.envs = None
self.num_envs = -1
self.set_envs(num_envs=1)
if (version > 0):
self.actor_critic = self.load(path, version)
else:
self.actor_critic = Policy(
self.envs.observation_space.shape,
self.envs.action_space,
base_kwargs={
'recurrent': self.recurrent_policy,
'shapes': list(reversed(self.env_def.model_shape)),
'dropout': dropout
},
model=architecture)
self.actor_critic.to(self.device)
#Reconstruction
self.reconstruct = reconstruct is not None
if (self.reconstruct):
#layers = self.envs.observation_space.shape[0]
#shapes = list(self.env_def.model_shape)
#self.r_model = Decoder(layers, shapes=shapes).to(self.device)
reconstruct.to(self.device)
self.r_model = lambda x: reconstruct.adapter(reconstruct(x))
#self.r_model = lambda x: reconstruct.adapter(reconstruct(x)).clamp(min=1e-6).log()
#self.r_loss = nn.L1Loss() #nn.NLLLoss() #nn.MSELoss()
self.r_loss = lambda pred, true: -r_weight * (true * torch.log(
pred.clamp(min=1e-7, max=1 - 1e-7))).sum(dim=1).mean()
self.r_optimizer = reconstruct.optimizer #optim.Adam(reconstruct.parameters(), lr = .0001)
if self.algo == 'a2c':
self.agent = A2C_ACKTR(self.actor_critic,
self.value_loss_coef,
self.entropy_coef,
lr=self.lr,
eps=self.eps,
alpha=self.alpha,
max_grad_norm=self.max_grad_norm)
elif self.algo == 'ppo':
self.agent = PPO(self.actor_critic,
self.clip_param,
self.ppo_epoch,
self.num_mini_batch,
self.value_loss_coef,
self.entropy_coef,
lr=self.lr,
eps=self.eps,
max_grad_norm=self.max_grad_norm,
use_clipped_value_loss=False)
elif self.algo == 'acktr':
self.agent = algo.A2C_ACKTR(self.actor_critic,
self.value_loss_coef,
self.entropy_coef,
acktr=True)
self.gail = False
self.gail_experts_dir = './gail_experts'
if self.gail:
assert len(self.envs.observation_space.shape) == 1
self.gail_discr = gail.Discriminator(
self.envs.observation_space.shape[0] +
self.envs.action_space.shape[0], 100, self.device)
file_name = os.path.join(
self.gail_experts_dir,
"trajs_{}.pt".format(env_name.split('-')[0].lower()))
self.gail_train_loader = torch.utils.data.DataLoader(
gail.ExpertDataset(file_name,
num_trajectories=4,
subsample_frequency=20),
batch_size=self.gail_batch_size,
shuffle=True,
drop_last=True)
self.rollouts = RolloutStorage(
self.num_steps, self.num_processes,
self.envs.observation_space.shape, self.envs.action_space,
self.actor_critic.recurrent_hidden_state_size)
def load(self, path, version):
policy = torch.load(os.path.join(path, "agent_{}.tar".format(version)))
#utils.get_vec_normalize(self.envs).ob_rms = ob_rms
self.actor_critic = policy
def save(self, path, version):
#ob_rms = getattr(utils.get_vec_normalize(self.envs), 'ob_rms', None)
torch.save(self.actor_critic,
os.path.join(path, "agent_{}.tar".format(version)))
def report(self, version, total_num_steps, FPS, rewards):
file_path = os.path.join(self.save_dir, "actor_critic_results.csv")
add_header = not os.path.exists(file_path)
if (len(rewards) > 0):
mean, median, min, max = np.mean(rewards), np.median(
rewards), np.min(rewards), np.max(rewards)
else:
mean, median, min, max = np.nan, np.nan, np.nan, np.nan
with open(file_path, 'a+') as results:
writer = csv.writer(results)
if (add_header):
header = [
'update', 'total_steps', 'FPS', 'mean_reward',
'median_reward', 'min_reward', 'max_reward'
]
writer.writerow(header)
writer.writerow(
(version, total_num_steps, FPS, mean, median, min, max))
def set_envs(self, level_path=None, num_envs=None):
num_envs = num_envs if num_envs else self.num_processes
if (level_path != self.level_path or self.envs is None
or num_envs != self.num_envs):
if (self.envs is not None):
self.envs.close()
self.level_path = level_path
self.envs = make_vec_envs(self.env_def, level_path, self.seed,
num_envs, self.gamma, self.log_dir,
self.device, True)
self.num_envs = num_envs
def update_reconstruction(self, rollouts):
s, p, l, w, h = list(rollouts.obs.size())
x = rollouts.obs.view(-1, l, w, h)
hidden = rollouts.recurrent_hidden_states.view(s * p, -1)
mask = rollouts.masks.view(s * p, -1)
#y = x.argmax(1)
y = x
self.r_optimizer.zero_grad()
self.agent.optimizer.zero_grad()
_, predictions, _ = self.actor_critic.base(x, hidden, mask)
reconstructions = self.r_model(predictions)
loss = self.r_loss(reconstructions, y)
loss.backward()
self.r_optimizer.step()
self.agent.optimizer.step()
return loss
def update_reconstruct_next(self, rollouts):
#Mask frames that are not relevant
mask = rollouts.masks.unfold(0, 2, 1).min(-1)[0]
mask = mask.view(-1)
mask = torch.nonzero(mask).squeeze()
#Image Pairs
l, w, h = list(rollouts.obs.size())[2:]
img_pairs = rollouts.obs.unfold(0, 2, 1) #128, 8, 14, 12, 16, 2
img_pairs = img_pairs.view(-1, l, w, h, 2)
img_pairs = img_pairs[mask]
x = img_pairs[:, :, :, :, 0]
y = img_pairs[:, :, :, :, 1]
#Input hidden states
hidden_size = rollouts.recurrent_hidden_states.size(2)
hidden = rollouts.recurrent_hidden_states[:-1].view(
-1, hidden_size) #129, 8, 512
hidden = hidden[mask]
#Update model
self.r_optimizer.zero_grad()
mask = torch.ones_like(mask).float().unsqueeze(1)
_, predictions, _ = self.actor_critic.base(x, hidden, mask)
reconstructions = self.r_model(predictions)
loss = self.r_loss(
reconstructions,
y) #model -> x or x and a? x already contains action features
loss.backward()
self.r_optimizer.step()
print(loss.item()) #add loss weight
return loss
def play(self, env, runs=1, visual=False):
env = GridGame()
reward_mean = 0
for i in range(runs):
score = self.play_game(env, visual)
reward_mean += score / runs
return score_mean
def play_game(self, level):
eval_envs = make_vec_envs(env_name, self.seed + self.num_processes,
self.num_processes, None, eval_log_dir,
device, True)
vec_norm = utils.get_vec_normalize(eval_envs)
if vec_norm is not None:
vec_norm.eval()
vec_norm.ob_rms = ob_rms
eval_episode_rewards = []
obs = eval_envs.reset()
eval_recurrent_hidden_states = torch.zeros(
self.num_processes,
self.actor_critic.recurrent_hidden_state_size).to(self.device)
eval_masks = torch.zeros(self.num_processes, 1).to(self.device)
while len(eval_episode_rewards) < 10:
with torch.no_grad():
_, action, _, eval_recurrent_hidden_states = actor_critic.act(
obs,
eval_recurrent_hidden_states,
eval_masks,
deterministic=True)
# Obser reward and next obs
obs, _, done, infos = eval_envs.step(action)
eval_masks = torch.tensor([[0.0] if done_ else [1.0]
for done_ in done],
dtype=torch.float32).to(device)
if (done):
print("Done!")
eval_envs.close()
def train_agent(self, num_env_steps):
env_name = self.env_def.name
obs = self.envs.reset()
self.rollouts.obs[0].copy_(obs)
self.rollouts.to(self.device)
n = 30
episode_rewards = deque(maxlen=n)
episode_values = deque(maxlen=n)
episode_end_values = deque(maxlen=n)
episode_end_probs = deque(maxlen=n)
episode_lengths = deque(maxlen=n)
compile_est = deque(maxlen=n)
first_steps = [True for i in range(self.num_processes)]
start = time.time()
num_updates = int(
num_env_steps) // self.num_steps // self.num_processes
for j in range(num_updates):
if self.use_linear_lr_decay:
# decrease learning rate linearly
utils.update_linear_schedule(
self.agent.optimizer, j, num_updates,
self.agent.optimizer.lr
if self.algo == "acktr" else self.lr)
for step in range(self.num_steps):
# Sample actions
with torch.no_grad():
value, Q, action, action_prob, action_log_prob, recurrent_hidden_states = \
self.actor_critic.act(self.rollouts.obs[step],
self.rollouts.recurrent_hidden_states[step],
self.rollouts.masks[step])
# Observe reward and next obs
obs, reward, done, infos = self.envs.step(action)
for i, step in enumerate(first_steps):
if step:
episode_values.append(value[i].item())
elif (done[i]):
episode_end_values.append(Q[i].item())
episode_end_probs.append(action_log_prob[i].item())
first_steps = done
for worker, info in enumerate(infos):
if 'episode' in info.keys():
r = info['episode']['r']
l = info['episode']['l']
episode_rewards.append(r)
episode_lengths.append(l)
if (r < -1):
compile_est.append(value[worker].item())
# If done then clean the history of observations.
masks = torch.FloatTensor([[0.0] if done_ else [1.0]
for done_ in done])
bad_masks = torch.FloatTensor(
[[0.0] if 'bad_transition' in info.keys() else [1.0]
for info in infos])
self.rollouts.insert(obs, recurrent_hidden_states, action,
action_prob, action_log_prob, value, Q,
reward, masks, bad_masks)
with torch.no_grad():
next_value = self.actor_critic.get_value(
self.rollouts.obs[-1],
self.rollouts.recurrent_hidden_states[-1],
self.rollouts.masks[-1]).detach()
if self.gail:
if j >= 10:
self.envs.venv.eval()
gail_epoch = self.gail_epoch
if j < 10:
gail_epoch = 100 # Warm up
for _ in range(gail_epoch):
self.gail_discr.update(
self.gail_train_loader, self.rollouts,
utils.get_vec_normalize(self.envs)._obfilt)
for step in range(self.num_steps):
self.rollouts.rewards[
step] = self.gail_discr.predict_reward(
self.rollouts.obs[step],
self.rollouts.actions[step], self.gamma,
self.rollouts.masks[step])
self.rollouts.compute_returns(next_value, self.use_gae, self.gamma,
self.gae_lambda,
self.use_proper_time_limits)
value_loss, action_loss, dist_entropy = self.agent.update(
self.rollouts)
if (self.reconstruct):
recon_loss = self.update_reconstruction(self.rollouts)
self.writer.add_scalar('generator/Reconstruction Loss',
recon_loss.item(), self.total_steps)
self.rollouts.after_update()
#Tensorboard Reporting
self.total_steps += self.num_processes * self.num_steps
self.writer.add_scalar('value/Mean Reward',
np.mean(episode_rewards), self.total_steps)
self.writer.add_scalar('value/Episode Mean Length',
np.mean(episode_lengths), self.total_steps)
self.writer.add_scalar('policy/Action Loss', action_loss,
self.total_steps)
self.writer.add_scalar('value/Value Loss', value_loss,
self.total_steps)
self.writer.add_scalar('policy/Distribution Entropy', dist_entropy,
self.total_steps)
self.writer.add_scalar('value/Win Probability',
np.mean(np.array(episode_rewards) > 0),
self.total_steps)
self.writer.add_scalar('value/Starting Value',
np.mean(episode_values), self.total_steps)
#self.writer.add_scalar('value/Ending Value', np.mean(episode_end_values), self.total_steps)
self.writer.add_scalar('value/Log Probs',
np.mean(episode_end_probs),
self.total_steps)
if (len(compile_est) > 0):
self.writer.add_scalar('value/Compile Estimate',
np.mean(compile_est), self.total_steps)
# save for every interval-th episode or for the last epoch
total_num_steps = (j + 1) * self.num_processes * self.num_steps
end = time.time()
if (j % self.save_interval == 0
or j == num_updates - 1) and self.save_dir != "":
self.version += 1
#self.save(self.version)
self.report(self.version, total_num_steps,
int(total_num_steps / (end - start)),
episode_rewards)
if j % self.log_interval == 0 and len(episode_rewards) > 1:
print(
"Updates {}, num timesteps {}, FPS {} \n Last {} training episodes: mean/median reward {:.1f}/{:.1f}, min/max reward {:.1f}/{:.1f}\n"
.format(j, total_num_steps,
int(total_num_steps / (end - start)),
len(episode_rewards), np.mean(episode_rewards),
np.median(episode_rewards),
np.min(episode_rewards), np.max(episode_rewards),
dist_entropy, value_loss, action_loss))
except:
shutil.rmtree(args.model_dir)
os.makedirs(args.model_dir)
env = deepmind_lab.Lab('tests/empty_room_test', ['RGB_INTERLEAVED'],
config=CONFIG)
env.reset()
obs_shape = env.observations()['RGB_INTERLEAVED'].shape
obs_shape = (obs_shape[2], obs_shape[0], obs_shape[1])
print('Observation Space: ', obs_shape)
action_space = Discrete(9)
env.close()
actor_critic = Policy(obs_shape, action_space)
actor_critic.to(args.device)
learner = Learner(args, q_batch, actor_critic)
for i in range(len(LEVELS)):
print('Build Actor {:d}'.format(i))
rollouts = RolloutStorage(args.num_steps, 1, obs_shape, action_space,
actor_critic.recurrent_hidden_state_size)
actor_critic = Policy(obs_shape, action_space)
actor_critic.to(args.device)
actor_name = 'actor_' + str(i)
actor = Actor(args, q_trace, learner, actor_critic, rollouts,
LEVELS[i], actor_name)
actors.append(actor)
