def __init__(self, config: Dict, agent: Agent, transitions_queue: Queue,
global_episode: Counter, global_update_step: Counter,
epsilone: Union[ExponentialEpsilon,
SinusoidalEpsilone], logger: Logger) -> None:
"""
Thread responsable de l'update des poids des réseaux de neurones de l'agent
:param config: Dictionnaire de configuration de l'expérience
:param agent: Agent à optimiser
:param transitions_queue: Queue à partir de laquelle les threads Player envoient leurs transitions au thread Trainer
:param global_episode: Compteur du nombre d'époside joués (partagé entre les threads)
:param global_update_step: Compteur du nombre d'update effectués (partagé entre les threads)
:param epsilone: Epsilone processus utilisé pour le bruit ajouté aux actions de l'agent
:param logger: Le logger utilisé au cours de l'expérience
"""
super().__init__()
self._config = config
self._agent = agent
self._episode_queue = transitions_queue
self._global_episode = global_episode
self._global_update_step = global_update_step
self._logger = logger
self._epsilone = epsilone
self._replay_buffer = PrioritizedReplayBuffer(
size=self._config["trainer_config"]["buffer_size"])
# TODO: permettre de switcher entre ReplayBuffer et PrioritizedReplayBuffer via la config
# ReplayBuffer(size=self._config["trainer_config"]["buffer_size"])
self._best_test_reward = float('-inf')
def __init__(self, parameters):
super(PriorDQN, self).__init__(parameters)
self.replay_buffer = PrioritizedReplayBuffer(
self.buffersize, parameters["alpha"])
self.beta_start = parameters["beta_start"]
self.beta_frames = parameters["beta_frames"]
class PriorDQN(Trainer):
def __init__(self, parameters):
super(PriorDQN, self).__init__(parameters)
self.replay_buffer = PrioritizedReplayBuffer(
self.buffersize, parameters["alpha"])
self.beta_start = parameters["beta_start"]
self.beta_frames = parameters["beta_frames"]
def push_to_buffer(self, state, action, reward, next_state, done):
self.replay_buffer.push(state, action, reward, next_state, done)
def beta_by_frame(self, frame_idx):
beta = self.beta_start + frame_idx * \
(1.0 - self.beta_start) / self.beta_frames
return min(1.0, beta)
def compute_td_loss(self, batch_size, frame_idx):
beta = self.beta_by_frame(frame_idx)
if len(self.replay_buffer) < batch_size:
return None
state, action, reward, next_state, done, indices, weights = self.replay_buffer.sample(
batch_size, beta)
state = Variable(torch.FloatTensor(np.float32(state)))
next_state = Variable(torch.FloatTensor(np.float32(next_state)))
action = Variable(torch.LongTensor(action))
reward = Variable(torch.FloatTensor(reward))
done = Variable(torch.FloatTensor(done))
weights = Variable(torch.FloatTensor(weights))
q_values = self.current_model(state)
q_value = q_values.gather(1, action.unsqueeze(1)).squeeze(1)
next_q_values = self.current_model(next_state)
next_q_state_values = self.target_model(next_state)
next_q_value = next_q_state_values.gather(
1, torch.max(next_q_values, 1)[1].unsqueeze(1)).squeeze(1)
expected_q_value = reward + self.gamma * next_q_value * (1 - done)
loss = (q_value - Variable(expected_q_value.data)).pow(2) * weights
loss[loss.gt(1)] = 1
prios = loss + 1e-5
loss = loss.mean()
self.optimizer.zero_grad()
loss.backward()
self.optimizer.step()
self.replay_buffer.update_priorities(indices, prios.data.cpu().numpy())
return loss
def test_random_sampling(self):
prb = PrioritizedReplayBuffer(8)
for exp in Transitions:
prb.add(exp)
indexes, samples, weights = prb.sample(1)
assert samples[0] in Transitions
assert indexes[0] in [0, 1, 2, 3, 4, 5, 6, 7]
assert weights[0] == 1
def __init__(self, config):
self.writer = SummaryWriter()
self.device = 'cuda' if T.cuda.is_available() else 'cpu'
self.dqn_type = config["dqn-type"]
self.run_title = config["run-title"]
self.env = gym.make(config["environment"])
self.num_states = np.prod(self.env.observation_space.shape)
self.num_actions = self.env.action_space.n
layers = [
self.num_states,
*config["architecture"],
self.num_actions
]
self.policy_net = Q_Network(self.dqn_type, layers).to(self.device)
self.target_net = Q_Network(self.dqn_type, layers).to(self.device)
self.target_net.load_state_dict(self.policy_net.state_dict())
self.target_net.eval()
capacity = config["max-experiences"]
self.p_replay_eps = config["p-eps"]
self.prioritized_replay = config["prioritized-replay"]
self.replay_buffer = PrioritizedReplayBuffer(capacity, config["p-alpha"]) if self.prioritized_replay \
else ReplayBuffer(capacity)
self.beta_scheduler = LinearSchedule(config["episodes"], initial_p=config["p-beta-init"], final_p=1.0)
self.epsilon_decay = lambda e: max(config["epsilon-min"], e * config["epsilon-decay"])
self.train_freq = config["train-freq"]
self.use_soft_update = config["use-soft-update"]
self.target_update = config["target-update"]
self.tau = config["tau"]
self.gamma = config["gamma"]
self.batch_size = config["batch-size"]
self.time_step = 0
self.optim = T.optim.AdamW(self.policy_net.parameters(), lr=config["lr-init"], weight_decay=config["weight-decay"])
self.lr_scheduler = T.optim.lr_scheduler.StepLR(self.optim, step_size=config["lr-step"], gamma=config["lr-gamma"])
self.criterion = nn.SmoothL1Loss(reduction="none") # Huber Loss
self.min_experiences = max(config["min-experiences"], config["batch-size"])
self.save_path = config["save-path"]
def test_update_priorities1(self):
prb = PrioritizedReplayBuffer(8)
for exp in Transitions:
prb.add(exp)
prb.update(idx=[0, 1, 3, 4, 5, 6, 7],
priorities=[0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1])
indexes, samples, weights = prb.sample(100, beta=0.4)
n = 0
sum_p = sum([
0.1**0.6, 0.1**0.6, 1.0**0.6, 0.1**0.6, 0.1**0.6, 0.1**0.6,
0.1**0.6, 0.1**0.6
])
assert (prb._st_sum._storage[-8:] == np.array([
0.1**0.6, 0.1**0.6, 1.0**0.6, 0.1**0.6, 0.1**0.6, 0.1**0.6,
0.1**0.6, 0.1**0.6
])).all()
assert isclose(prb._st_sum._storage[0], sum_p)
expected_weight_other = 1.0
expected_weight_2 = (100**(-0.4)) / ((100 * (0.1**0.6))**(-0.4))
for idx, sample, weight in zip(indexes, samples, weights):
if idx == 2:
n += 1
assert isclose(weight, expected_weight_2)
else:
assert isclose(weight, expected_weight_other)
assert n > 10
def test_circular_buffer(self):
prb = PrioritizedReplayBuffer(4)
prb.add(Transitions[0])
prb.add(Transitions[1])
prb.add(Transitions[2])
prb.add(Transitions[3])
prb.add(Transitions[4])
prb.add(Transitions[5])
assert (prb._storage == [
Transitions[4], Transitions[5], Transitions[2], Transitions[3]
]).all()
def test_len(self):
prb = PrioritizedReplayBuffer(4)
prb.add(Transitions[0]).add(Transitions[1]).add(Transitions[2])
assert len(prb) == 3
for i in range(8):
prb.add(Transitions[i])
assert len(prb) == 4
return action
def reset_noise(self):
self.noisy1.reset_noise()
self.noisy2.reset_noise()
current_model = NoisyDQN(env.observation_space.shape[0], env.action_space.n)
target_model = NoisyDQN(env.observation_space.shape[0], env.action_space.n)
optimizer = optim.Adam(current_model.parameters(), lr=0.0001)
beta_start = 0.4
beta_iterations = 50000
beta_by_iteration = lambda iteration: min(1.0, beta_start + iteration * (1.0 - beta_start) / beta_iterations)
replay_buffer = PrioritizedReplayBuffer(25000, alpha=0.6)
def update_target(current_model, target_model):
target_model.load_state_dict(current_model.state_dict())
update_target(current_model, target_model)
def compute_td_loss(batch_size, beta):
state, action, reward, next_state, done, weights, indices = replay_buffer.sample(batch_size, beta)
state = autograd.Variable(torch.FloatTensor(np.float32(state)))
next_state = autograd.Variable(torch.FloatTensor(np.float32(next_state)))
action = autograd.Variable(torch.LongTensor(action))
reward = autograd.Variable(torch.FloatTensor(reward))
done = autograd.Variable(torch.FloatTensor(np.float32(done)))
weights = autograd.Variable(torch.FloatTensor(weights))
def learn(env,
seed=None,
num_agents = 2,
lr=0.00008,
total_timesteps=100000,
buffer_size=2000,
exploration_fraction=0.2,
exploration_final_eps=0.01,
train_freq=1,
batch_size=16,
print_freq=100,
checkpoint_freq=10000,
checkpoint_path=None,
learning_starts=2000,
gamma=0.99,
target_network_update_freq=1000,
prioritized_replay=False,
prioritized_replay_alpha=0.6,
prioritized_replay_beta0=0.4,
prioritized_replay_beta_iters=None,
prioritized_replay_eps=1e-6,
param_noise=False,
callback=None,
load_path=None,
**network_kwargs
):
"""Train a deepq model.
Parameters
-------
env: gym.Env
environment to train on
network: string or a function
neural network to use as a q function approximator. If string, has to be one of the names of registered models in baselines.common.models
(mlp, cnn, conv_only). If a function, should take an observation tensor and return a latent variable tensor, which
will be mapped to the Q function heads (see build_q_func in baselines.deepq.models for details on that)
seed: int or None
prng seed. The runs with the same seed "should" give the same results. If None, no seeding is used.
lr: float
learning rate for adam optimizer
total_timesteps: int
number of env steps to optimizer for
buffer_size: int
size of the replay buffer
exploration_fraction: float
fraction of entire training period over which the exploration rate is annealed
exploration_final_eps: float
final value of random action probability
train_freq: int
update the model every `train_freq` steps.
set to None to disable printing
batch_size: int
size of a batched sampled from replay buffer for training
print_freq: int
how often to print out training progress
set to None to disable printing
checkpoint_freq: int
how often to save the model. This is so that the best version is restored
at the end of the training. If you do not wish to restore the best version at
the end of the training set this variable to None.
learning_starts: int
how many steps of the model to collect transitions for before learning starts
gamma: float
discount factor
target_network_update_freq: int
update the target network every `target_network_update_freq` steps.
prioritized_replay: True
if True prioritized replay buffer will be used.
prioritized_replay_alpha: float
alpha parameter for prioritized replay buffer
prioritized_replay_beta0: float
initial value of beta for prioritized replay buffer
prioritized_replay_beta_iters: int
number of iterations over which beta will be annealed from initial value
to 1.0. If set to None equals to total_timesteps.
prioritized_replay_eps: float
epsilon to add to the TD errors when updating priorities.
param_noise: bool
whether or not to use parameter space noise (https://arxiv.org/abs/1706.01905)
callback: (locals, globals) -> None
function called at every steps with state of the algorithm.
If callback returns true training stops.
load_path: str
path to load the model from. (default: None)
**network_kwargs
additional keyword arguments to pass to the network builder.
Returns
-------
act: ActWrapper
Wrapper over act function. Adds ability to save it and load it.
See header of baselines/deepq/categorical.py for details on the act function.
"""
# Create all the functions necessary to train the model
set_global_seeds(seed)
double_q = True
grad_norm_clipping = True
shared_weights = True
play_test = 1000
nsteps = 16
agent_ids = env.agent_ids()
# Create the replay buffer
if prioritized_replay:
replay_buffer = PrioritizedReplayBuffer(buffer_size, alpha=prioritized_replay_alpha)
if prioritized_replay_beta_iters is None:
prioritized_replay_beta_iters = total_timesteps
beta_schedule = LinearSchedule(prioritized_replay_beta_iters,
initial_p=prioritized_replay_beta0,
final_p=1.0)
else:
replay_buffer = ReplayBuffer(buffer_size)
beta_schedule = None
# Create the schedule for exploration starting from 1.
exploration = LinearSchedule(schedule_timesteps=int(exploration_fraction * total_timesteps),
initial_p=1.0,
final_p=exploration_final_eps)
print(f'agent_ids {agent_ids}')
num_actions = env.action_space.n
print(f'num_actions {num_actions}')
dqn_agent = MAgent(env, agent_ids, nsteps, lr, replay_buffer, shared_weights, double_q, num_actions,
gamma, grad_norm_clipping, param_noise)
if load_path is not None:
load_path = osp.expanduser(load_path)
ckpt = tf.train.Checkpoint(model=dqn_agent.q_network)
manager = tf.train.CheckpointManager(ckpt, load_path, max_to_keep=None)
ckpt.restore(manager.latest_checkpoint)
print("Restoring from {}".format(manager.latest_checkpoint))
dqn_agent.update_target()
episode_rewards = [0.0 for i in range(101)]
saved_mean_reward = None
obs_all = env.reset()
obs_shape = obs_all
reset = True
done = False
# Start total timer
tstart = time.time()
for t in range(total_timesteps):
if callback is not None:
if callback(locals(), globals()):
break
kwargs = {}
if not param_noise:
update_eps = tf.constant(exploration.value(t))
update_param_noise_threshold = 0.
else:
update_eps = tf.constant(0.)
# Compute the threshold such that the KL divergence between perturbed and non-perturbed
# policy is comparable to eps-greedy exploration with eps = exploration.value(t).
# See Appendix C.1 in Parameter Space Noise for Exploration, Plappert et al., 2017
# for detailed explanation.
update_param_noise_threshold = -np.log(
1. - exploration.value(t) + exploration.value(t) / float(env.action_space.n))
kwargs['reset'] = reset
kwargs['update_param_noise_threshold'] = update_param_noise_threshold
kwargs['update_param_noise_scale'] = True
if t % print_freq == 0:
time_1000_step = time.time()
nseconds = time_1000_step - tstart
tstart = time_1000_step
print(f'time spend to perform {t-print_freq} to {t} steps is {nseconds} ')
print('eps update', exploration.value(t))
mb_obs, mb_rewards, mb_actions, mb_values, mb_dones = [], [], [], [], []
# mb_states = states
epinfos = []
for _ in range(nsteps):
# Given observations, take action and value (V(s))
obs_ = tf.constant(obs_all)
# print(f'obs_.shape is {obs_.shape}')
# obs_ = tf.expand_dims(obs_, axis=1)
# print(f'obs_.shape is {obs_.shape}')
actions_list, fps_ = dqn_agent.choose_action(obs_, update_eps=update_eps, **kwargs)
fps = [[] for _ in agent_ids]
# print(f'fps_.shape is {np.asarray(fps_).shape}')
for a in agent_ids:
fps[a] = np.delete(fps_, a, axis=0)
# print(fps)
# print(f'actions_list is {actions_list}')
# print(f'values_list is {values_list}')
# Append the experiences
mb_obs.append(obs_all.copy())
mb_actions.append(actions_list)
mb_values.append(fps)
mb_dones.append([float(done) for _ in range(num_agents)])
# Take actions in env and look the results
obs1_all, rews, done, info = env.step(actions_list)
rews = [np.max(rews) for _ in range(len(rews))] # for cooperative purpose same reward for every one
# print(rews)
mb_rewards.append(rews)
obs_all = obs1_all
# print(rewards, done, info)
maybeepinfo = info[0].get('episode')
if maybeepinfo: epinfos.append(maybeepinfo)
episode_rewards[-1] += np.max(rews)
if done:
episode_rewards.append(0.0)
obs_all = env.reset()
reset = True
mb_dones.append([float(done) for _ in range(num_agents)])
# print(f'mb_actions is {mb_actions}')
# print(f'mb_rewards is {mb_rewards}')
# print(f'mb_values is {mb_values}')
# print(f'mb_dones is {mb_dones}')
mb_obs = np.asarray(mb_obs, dtype=obs_all[0].dtype)
mb_actions = np.asarray(mb_actions, dtype=actions_list[0].dtype)
mb_rewards = np.asarray(mb_rewards, dtype=np.float32)
mb_values = np.asarray(mb_values, dtype=np.float32)
# print(f'mb_values.shape is {mb_values.shape}')
mb_dones = np.asarray(mb_dones, dtype=np.bool)
mb_masks = mb_dones[:-1]
mb_dones = mb_dones[1:]
# print(f'mb_actions is {mb_actions}')
# print(f'mb_rewards is {mb_rewards}')
# print(f'mb_values is {mb_values}')
# print(f'mb_dones is {mb_dones}')
# print(f'mb_masks is {mb_masks}')
# print(f'mb_masks.shape is {mb_masks.shape}')
if gamma > 0.0:
# Discount/bootstrap off value fn
last_values = dqn_agent.value(tf.constant(obs_all))
# print(f'last_values is {last_values}')
if mb_dones[-1][0] == 0:
# print('================ hey ================ mb_dones[-1][0] == 0')
mb_rewards = discount_with_dones(np.concatenate((mb_rewards, [last_values])),
np.concatenate((mb_dones, [[float(False) for _ in range(num_agents)]]))
, gamma)[:-1]
else:
mb_rewards = discount_with_dones(mb_rewards, mb_dones, gamma)
# print(f'after discount mb_rewards is {mb_rewards}')
if replay_buffer is not None:
replay_buffer.add(mb_obs, mb_actions, mb_rewards, obs1_all, mb_masks[:,0],
mb_values, np.tile([exploration.value(t), t], (nsteps, num_agents, 1)))
if t > learning_starts and t % train_freq == 0:
# Minimize the error in Bellman's equation on a batch sampled from replay buffer.
if prioritized_replay:
experience = replay_buffer.sample(batch_size, beta=beta_schedule.value(t))
(obses_t, actions, rewards, obses_tp1, dones, weights, batch_idxes) = experience
else:
obses_t, actions, rewards, obses_tp1, dones, fps, extra_datas = replay_buffer.sample(batch_size)
weights, batch_idxes = np.ones_like(rewards), None
obses_t, obses_tp1 = tf.constant(obses_t), None
actions, rewards, dones = tf.constant(actions), tf.constant(rewards, dtype=tf.float32), tf.constant(dones)
weights, fps, extra_datas = tf.constant(weights), tf.constant(fps), tf.constant(extra_datas)
s = obses_t.shape
# print(f'obses_t.shape is {s}')
obses_t = tf.reshape(obses_t, (s[0] * s[1], *s[2:]))
s = actions.shape
# print(f'actions.shape is {s}')
actions = tf.reshape(actions, (s[0] * s[1], *s[2:]))
s = rewards.shape
# print(f'rewards.shape is {s}')
rewards = tf.reshape(rewards, (s[0] * s[1], *s[2:]))
s = weights.shape
# print(f'weights.shape is {s}')
weights = tf.reshape(weights, (s[0] * s[1], *s[2:]))
s = fps.shape
# print(f'fps.shape is {s}')
fps = tf.reshape(fps, (s[0] * s[1], *s[2:]))
# print(f'fps.shape is {fps.shape}')
s = extra_datas.shape
# print(f'extra_datas.shape is {s}')
extra_datas = tf.reshape(extra_datas, (s[0] * s[1], *s[2:]))
s = dones.shape
# print(f'dones.shape is {s}')
dones = tf.reshape(dones, (s[0], s[1], *s[2:]))
# print(f'dones.shape is {s}')
td_errors = dqn_agent.nstep_train(obses_t, actions, rewards, obses_tp1, dones, weights, fps, extra_datas)
if t > learning_starts and t % target_network_update_freq == 0:
# Update target network periodically.
dqn_agent.update_target()
if t % play_test == 0 and t != 0:
play_test_games(dqn_agent)
mean_100ep_reward = np.mean(episode_rewards[-101:-1])
num_episodes = len(episode_rewards)
if done and print_freq is not None and len(episode_rewards) % print_freq == 0:
print(f'last 100 episode mean reward {mean_100ep_reward} in {num_episodes} playing')
logger.record_tabular("steps", t)
logger.record_tabular("episodes", num_episodes)
logger.record_tabular("mean 100 episode reward", mean_100ep_reward)
logger.record_tabular("% time spent exploring", int(100 * exploration.value(t)))
logger.dump_tabular()
def train(env, args, writer):
current_model = DQN(env, args).to(args.device)
target_model = DQN(env, args).to(args.device)
if args.noisy:
current_model.update_noisy_modules()
target_model.update_noisy_modules()
if args.load_model: # and os.path.isfile(args.load_model)
load_model(current_model, args)
load_model(target_model, args)
epsilon_by_frame = epsilon_scheduler(args.eps_start, args.eps_final,
args.eps_decay)
beta_by_frame = beta_scheduler(args.beta_start, args.beta_frames)
if args.prioritized_replay:
replay_buffer = PrioritizedReplayBuffer(args.buffer_size, args.alpha)
else:
replay_buffer = ReplayBuffer(args.buffer_size)
state_buffer = deque(maxlen=args.action_repeat)
states_deque = [
deque(maxlen=args.multi_step) for _ in range(args.num_agents)
]
rewards_deque = [
deque(maxlen=args.multi_step) for _ in range(args.num_agents)
]
actions_deque = [
deque(maxlen=args.multi_step) for _ in range(args.num_agents)
]
optimizer = optim.Adam(current_model.parameters(), lr=args.lr)
reward_list, length_list, loss_list = [], [], []
episode_reward = 0
episode_length = 0
episode = 0
prev_time = time.time()
prev_frame = 1
state, state_buffer = get_initial_state(env, state_buffer,
args.action_repeat)
for frame_idx in range(1, args.max_frames + 1):
if args.noisy:
current_model.sample_noise()
target_model.sample_noise()
epsilon = epsilon_by_frame(frame_idx)
action = current_model.act(
torch.FloatTensor(state).to(args.device), epsilon)
next_state, reward, done, end = env.step(action,
save_screenshots=False)
add_state(next_state, state_buffer)
next_state = recent_state(state_buffer)
for agent_index in range(len(done)):
states_deque[agent_index].append((state[agent_index]))
rewards_deque[agent_index].append(reward[agent_index])
actions_deque[agent_index].append(action[agent_index])
if len(states_deque[agent_index]
) == args.multi_step or done[agent_index]:
n_reward = multi_step_reward(rewards_deque[agent_index],
args.gamma)
n_state = states_deque[agent_index][0]
n_action = actions_deque[agent_index][0]
replay_buffer.push(n_state, n_action, n_reward,
next_state[agent_index],
np.float32(done[agent_index]))
# delete the agents that have reached the goal
r_index = 0
for r in range(len(done)):
if done[r] is True:
state_buffer, states_deque, actions_deque, rewards_deque = del_record(
r_index, state_buffer, states_deque, actions_deque,
rewards_deque)
r_index -= 1
r_index += 1
next_state = recent_state(state_buffer)
state = next_state
episode_reward += np.array(reward).mean()
episode_length += 1
if end:
if args.save_video and episode % 10 == 0:
evaluate(env, current_model, args)
state, state_buffer = get_initial_state(env, state_buffer,
args.action_repeat)
reward_list.append(episode_reward)
length_list.append(episode_length)
writer.add_scalar("data/episode_reward", episode_reward, frame_idx)
writer.add_scalar("data/episode_length", episode_length, frame_idx)
episode_reward, episode_length = 0, 0
for d in range(len(states_deque)):
states_deque[d].clear()
rewards_deque[d].clear()
actions_deque[d].clear()
states_deque = [
deque(maxlen=args.multi_step) for _ in range(args.num_agents)
]
rewards_deque = [
deque(maxlen=args.multi_step) for _ in range(args.num_agents)
]
actions_deque = [
deque(maxlen=args.multi_step) for _ in range(args.num_agents)
]
episode += 1
if len(replay_buffer
) > args.learning_start and frame_idx % args.train_freq == 0:
beta = beta_by_frame(frame_idx)
losses = 0
for _ in range(1):
loss = compute_td_loss(current_model, target_model,
replay_buffer, optimizer, args, beta)
losses += loss.item()
loss_list.append(losses)
writer.add_scalar("data/loss", loss.item(), frame_idx)
if frame_idx % args.update_target == 0:
update_target(current_model, target_model)
if frame_idx % args.evaluation_interval == 0:
print_log(frame_idx, prev_frame, prev_time, reward_list,
length_list, loss_list)
reward_list.clear(), length_list.clear(), loss_list.clear()
prev_frame = frame_idx
prev_time = time.time()
save_model(current_model, args)
save_model(current_model, args)
def train(env, args, writer, datetime):
best_iou = -1.0
if args.env in ['1DStatic', '1DDynamic']:
current_model = DQN_1D(env, args).to(args.device)
target_model = DQN_1D(env, args).to(args.device)
elif args.env in ['2DStatic', '2DDynamic']:
current_model = DQN_2D(env, args).to(args.device)
target_model = DQN_2D(env, args).to(args.device)
elif args.env in ['3DStatic', '3DDynamic']:
current_model = DQN_3D(env, args).to(args.device)
target_model = DQN_3D(env, args).to(args.device)
if args.noisy:
current_model.update_noisy_modules()
target_model.update_noisy_modules()
if args.load_model and os.path.isfile(args.load_model):
load_model(current_model, args)
epsilon_by_frame = epsilon_scheduler(args.eps_start, args.eps_final,
args.eps_decay)
beta_by_frame = beta_scheduler(args.beta_start, args.beta_frames)
if args.prioritized_replay:
replay_buffer = PrioritizedReplayBuffer(args.buffer_size, args.alpha)
else:
replay_buffer = ReplayBuffer(args.buffer_size)
state_deque = deque(maxlen=args.multi_step)
reward_deque = deque(maxlen=args.multi_step)
action_deque = deque(maxlen=args.multi_step)
optimizer = optim.Adam(current_model.parameters(), lr=args.lr)
reward_list, length_list, loss_list = [], [], []
episode_reward = 0
episode_length = 0
episode = 0
prev_time = time.time()
prev_frame = 1
state = env.reset()
for frame_idx in range(1, args.max_frames + 1):
if args.render:
env.render()
if args.noisy:
current_model.sample_noise()
target_model.sample_noise()
epsilon = epsilon_by_frame(frame_idx)
if args.env in ['2DDynamic']:
action = current_model.act(
torch.FloatTensor(state).to(args.device), epsilon)
else:
action = current_model.act(
torch.FloatTensor(state).to(args.device), epsilon)
next_state, reward, done = env.step(action)
state_deque.append(state)
reward_deque.append(reward)
action_deque.append(action)
if len(state_deque) == args.multi_step or done:
n_reward = multi_step_reward(reward_deque, args.gamma)
n_state = state_deque[0]
n_action = action_deque[0]
replay_buffer.push(n_state, n_action, n_reward, next_state,
np.float32(done))
state = next_state
episode_reward += reward
episode_length += 1
if done:
episode += 1
state = env.reset()
reward_list.append(episode_reward)
length_list.append(episode_length)
writer.add_scalar("Episode_reward/train", episode_reward, episode)
writer.add_scalar("Episode_length/train", episode_length, episode)
episode_reward = 0
episode_length = 0
state_deque.clear()
reward_deque.clear()
action_deque.clear()
if len(replay_buffer
) > args.learning_start and frame_idx % args.train_freq == 0:
beta = beta_by_frame(frame_idx)
loss = compute_td_loss(current_model, target_model, replay_buffer,
optimizer, args, beta)
loss_list.append(loss.item())
writer.add_scalar("Loss/train", loss.item(), frame_idx)
if frame_idx % args.update_target == 0:
update_target(current_model, target_model)
if frame_idx % args.evaluation_interval == 0:
print_log(frame_idx, prev_frame, prev_time, reward_list,
length_list, loss_list, args)
reward_list.clear(), length_list.clear(), loss_list.clear()
prev_frame = frame_idx
prev_time = time.time()
best_iou = test(env, args, current_model, best_iou, writer,
episode, datetime)
def train(env, args, writer):
current_model = DQN(env, args).to(args.device)
target_model = DQN(env, args).to(args.device)
for para in target_model.parameters():
para.requires_grad = False
if args.noisy:
current_model.update_noisy_modules()
target_model.update_noisy_modules()
#target_model.eval()
if args.load_model and os.path.isfile(args.load_model):
load_model(current_model, args)
update_target(current_model, target_model)
epsilon_by_frame = epsilon_scheduler(args.eps_start, args.eps_final,
args.eps_decay)
beta_by_frame = beta_scheduler(args.beta_start, args.beta_frames)
if args.prioritized_replay:
replay_buffer = PrioritizedReplayBuffer(args.buffer_size, args.alpha)
args.buffer_size = replay_buffer.it_capacity
else:
replay_buffer = ReplayBuffer(args.buffer_size)
print_args(args)
state_deque = deque(maxlen=args.multi_step)
reward_deque = deque(maxlen=args.multi_step)
action_deque = deque(maxlen=args.multi_step)
if args.optim == 'adam':
optimizer = optim.Adam(current_model.parameters(),
lr=args.lr,
eps=args.adam_eps,
betas=(0.9, args.beta2))
elif args.optim == 'laprop':
optimizer = laprop.LaProp(current_model.parameters(),
lr=args.lr,
betas=(0.9, args.beta2))
reward_list, length_list, loss_list = [], [], []
episode_reward = 0.
episode_length = 0
prev_time = time.time()
prev_frame = 1
state = env.reset()
evaluation_interval = args.evaluation_interval
for frame_idx in range(1, args.max_frames + 1):
if args.render:
env.render()
if args.noisy:
current_model.sample_noise()
target_model.sample_noise()
epsilon = epsilon_by_frame(frame_idx)
action = current_model.act(
torch.FloatTensor(state).to(args.device), epsilon)
next_state, raw_reward, done, _ = env.step(action)
if args.clip_rewards:
reward = np.clip(raw_reward, -1., 1.)
else:
reward = raw_reward
state_deque.append(state)
reward_deque.append(reward)
action_deque.append(action)
if len(state_deque) == args.multi_step or done:
n_reward = multi_step_reward(reward_deque, args.gamma)
n_state = state_deque[0]
n_action = action_deque[0]
replay_buffer.push(n_state, n_action, n_reward, next_state,
np.float32(done))
state = next_state
episode_reward += raw_reward
episode_length += 1
if episode_length >= 9950:
while not done:
_, _, done, _ = env.step(random.randrange(env.action_space.n))
if done:
state = env.reset()
reward_list.append(episode_reward)
length_list.append(episode_length)
if episode_length > 10000:
print('{:.2f}'.format(episode_reward), end='')
writer.add_scalar("data/episode_reward", episode_reward, frame_idx)
writer.add_scalar("data/episode_length", episode_length, frame_idx)
episode_reward, episode_length = 0., 0
state_deque.clear()
reward_deque.clear()
action_deque.clear()
if len(replay_buffer
) > args.learning_start and frame_idx % args.train_freq == 0:
beta = beta_by_frame(frame_idx)
loss = compute_td_loss(current_model, target_model, replay_buffer,
optimizer, args, beta)
loss_list.append(loss.item())
writer.add_scalar("data/loss", loss.item(), frame_idx)
if frame_idx % args.update_target == 0:
update_target(current_model, target_model)
if frame_idx % evaluation_interval == 0:
if len(length_list) > 0:
print_log(frame_idx, prev_frame, prev_time, reward_list,
length_list, loss_list, args)
reward_list.clear(), length_list.clear(), loss_list.clear()
prev_frame = frame_idx
prev_time = time.time()
save_model(current_model, args)
else:
evaluation_interval += args.evaluation_interval
if frame_idx % 200000 == 0:
if args.adam_eps == 1.5e-4:
save_model(current_model,
args,
name="{}_{}".format(args.optim, frame_idx))
else:
save_model(current_model,
args,
name="{}{:.2e}_{}".format(args.optim, args.adam_eps,
frame_idx))
reward_list.append(episode_reward)
length_list.append(episode_length)
print_log(frame_idx, prev_frame, prev_time, reward_list, length_list,
loss_list, args)
reward_list.clear(), length_list.clear(), loss_list.clear()
prev_frame = frame_idx
prev_time = time.time()
save_model(current_model, args)
def main(args):
config = load_config(args)
prefix = config['env_id']
training_config = config['training_config']
if config['name_suffix']:
prefix += config['name_suffix']
if config['path_prefix']:
prefix = os.path.join(config['path_prefix'], prefix)
if not os.path.exists(prefix):
os.makedirs(prefix)
train_log = os.path.join(prefix, 'train.log')
logger = Logger(open(train_log, "w"))
logger.log('Command line:', " ".join(sys.argv[:]))
logger.log(args)
logger.log(config)
env_params = training_config['env_params']
env_id = config['env_id']
if "NoFrameskip" not in env_id:
env = make_atari_cart(env_id)
else:
env = make_atari(env_id)
env = wrap_deepmind(env, **env_params)
env = wrap_pytorch(env)
seed = training_config['seed']
env.seed(seed)
np.random.seed(seed)
random.seed(seed)
torch.manual_seed(seed)
state = env.reset()
dtype = state.dtype
logger.log("env_shape: {}, num of actions: {}".format(
env.observation_space.shape, env.action_space.n))
if "NoFrameskip" in env_id:
logger.log('action meaning:',
env.unwrapped.get_action_meanings()[:env.action_space.n])
robust = training_config.get('robust', False)
adv_train = training_config.get('adv_train', False)
bound_solver = training_config.get('bound_solver', 'cov')
attack_config = {}
if adv_train or bound_solver == 'pgd':
test_config = config['test_config']
attack_config = training_config["attack_config"]
adv_ratio = training_config.get('adv_ratio', 1)
if adv_train:
logger.log('using adversarial examples for training, adv ratio:',
adv_ratio)
else:
logger.log('using pgd regularization training')
if robust or adv_train:
schedule_start = training_config['schedule_start']
schedule_length = training_config['schedule_length']
starting_epsilon = training_config['start_epsilon']
end_epsilon = training_config['epsilon']
epsilon_scheduler = EpsilonScheduler(
training_config.get("schedule_type", "linear"), schedule_start,
schedule_start + schedule_length - 1, starting_epsilon,
end_epsilon, 1)
max_eps = end_epsilon
model_width = training_config['model_width']
robust_model = robust and bound_solver != 'pgd'
dueling = training_config.get('dueling', True)
current_model = model_setup(env_id, env, robust_model, logger, USE_CUDA,
dueling, model_width)
target_model = model_setup(env_id, env, robust_model, logger, USE_CUDA,
dueling, model_width)
load_path = training_config["load_model_path"]
if load_path != "" and os.path.exists(load_path):
load_frame = int(re.findall('^.*frame_([0-9]+).pth$', load_path)[0])
logger.log('\ntrain from model {}, current frame index is {}\n'.format(
load_path, load_frame))
current_model.features.load_state_dict(torch.load(load_path))
target_model.features.load_state_dict(torch.load(load_path))
else:
logger.log('\ntrain from scratch')
load_frame = 1
lr = training_config['lr']
grad_clip = training_config['grad_clip']
natural_loss_fn = training_config['natural_loss_fn']
optimizer = optim.Adam(current_model.parameters(),
lr=lr,
eps=training_config['adam_eps'])
# Do not evaluate gradient for target model.
for param in target_model.features.parameters():
param.requires_grad = False
buffer_config = training_config['buffer_params']
replay_initial = buffer_config['replay_initial']
buffer_capacity = buffer_config['buffer_capacity']
use_cpp_buffer = training_config["cpprb"]
use_async_rb = training_config['use_async_rb']
num_frames = training_config['num_frames']
batch_size = training_config['batch_size']
gamma = training_config['gamma']
if use_cpp_buffer:
logger.log('using cpp replay buffer')
if use_async_rb:
replay_buffer_ctor = AsyncReplayBuffer(initial_state=state,
batch_size=batch_size)
else:
replay_buffer_ctor = cpprb.PrioritizedReplayBuffer
else:
logger.log('using python replay buffer')
per = training_config['per']
if per:
logger.log('using prioritized experience replay.')
alpha = buffer_config['alpha']
buffer_beta_start = buffer_config['buffer_beta_start']
buffer_beta_frames = buffer_config.get('buffer_beta_frames', -1)
if buffer_beta_frames < replay_initial:
buffer_beta_frames = num_frames - replay_initial
logger.log('beffer_beta_frames reset to ', buffer_beta_frames)
buffer_beta_scheduler = BufferBetaScheduler(buffer_beta_start,
buffer_beta_frames,
start_frame=replay_initial)
if use_cpp_buffer:
replay_buffer = replay_buffer_ctor(
size=buffer_capacity,
# env_dict={"obs": {"shape": state.shape, "dtype": np.uint8},
env_dict={
"obs": {
"shape": state.shape,
"dtype": dtype
},
"act": {
"shape": 1,
"dtype": np.uint8
},
"rew": {},
# "next_obs": {"shape": state.shape, "dtype": np.uint8},
"next_obs": {
"shape": state.shape,
"dtype": dtype
},
"done": {}
},
alpha=alpha,
eps=0.0) # We add eps manually in training loop
else:
replay_buffer = PrioritizedReplayBuffer(buffer_capacity,
alpha=alpha)
else:
logger.log('using regular replay.')
if use_cpp_buffer:
replay_buffer = cpprb.ReplayBuffer(
buffer_capacity,
# {"obs": {"shape": state.shape, "dtype": np.uint8},
{
"obs": {
"shape": state.shape,
"dtype": dtype
},
"act": {
"shape": 1,
"dtype": np.uint8
},
"rew": {},
# "next_obs": {"shape": state.shape, "dtype": np.uint8},
"next_obs": {
"shape": state.shape,
"dtype": dtype
},
"done": {}
})
else:
replay_buffer = ReplayBuffer(buffer_capacity)
update_target(current_model, target_model)
act_epsilon_start = training_config['act_epsilon_start']
act_epsilon_final = training_config['act_epsilon_final']
act_epsilon_decay = training_config['act_epsilon_decay']
act_epsilon_method = training_config['act_epsilon_method']
if training_config.get('act_epsilon_decay_zero', True):
decay_zero = num_frames
else:
decay_zero = None
act_epsilon_scheduler = ActEpsilonScheduler(act_epsilon_start,
act_epsilon_final,
act_epsilon_decay,
method=act_epsilon_method,
start_frame=replay_initial,
decay_zero=decay_zero)
# Use optimized cuda memory management
memory_mgr = CudaTensorManager(state.shape,
batch_size,
per,
USE_CUDA,
dtype=dtype)
losses = []
td_losses = []
batch_cur_q = []
batch_exp_q = []
sa = None
kappa = None
hinge = False
if robust:
logger.log(
'using convex relaxation certified classification loss as a regularization!'
)
kappa = training_config['kappa']
reg_losses = []
sa = np.zeros(
(current_model.num_actions, current_model.num_actions - 1),
dtype=np.int32)
for i in range(sa.shape[0]):
for j in range(sa.shape[1]):
if j < i:
sa[i][j] = j
else:
sa[i][j] = j + 1
sa = torch.LongTensor(sa)
hinge = training_config.get('hinge', False)
logger.log('using hinge loss (default is cross entropy): ', hinge)
if training_config['use_async_env']:
# Create an environment in a separate process, run asychronously
async_env = AsyncEnv(env_id,
result_path=prefix,
draw=training_config['show_game'],
record=training_config['record_game'],
env_params=env_params,
seed=seed)
# initialize parameters in logging
all_rewards = []
episode_reward = 0
act_epsilon = np.nan
grad_norm = np.nan
weights_norm = np.nan
best_test_reward = -float('inf')
buffer_stored_size = 0
if adv_train:
attack_count = 0
suc_count = 0
if robust and bound_solver == 'pgd':
ori_margin, adv_margin = np.nan, np.nan
start_time = time.time()
period_start_time = time.time()
# Main Loop
for frame_idx in range(load_frame, num_frames + 1):
# Step 1: get current action
frame_start = time.time()
t = time.time()
eps = 0
if adv_train or robust:
eps = epsilon_scheduler.get_eps(frame_idx, 0)
act_epsilon = act_epsilon_scheduler.get(frame_idx)
if adv_train and eps != np.nan and eps >= np.finfo(np.float32).tiny:
ori_state_tensor = torch.from_numpy(
np.ascontiguousarray(state)).unsqueeze(0).cuda().to(
torch.float32)
if dtype in UINTS:
ori_state_tensor /= 255
attack_config['params']['epsilon'] = eps
if random.random() < adv_ratio:
attack_count += 1
state_tensor = attack(current_model, ori_state_tensor,
attack_config)
if current_model.act(state_tensor)[0] != current_model.act(
ori_state_tensor)[0]:
suc_count += 1
else:
state_tensor = ori_state_tensor
action = current_model.act(state_tensor, act_epsilon)[0]
else:
with torch.no_grad():
state_tensor = torch.from_numpy(
np.ascontiguousarray(state)).unsqueeze(0).cuda().to(
torch.float32)
if dtype in UINTS:
state_tensor /= 255
ori_state_tensor = torch.clone(state_tensor)
action = current_model.act(state_tensor, act_epsilon)[0]
# torch.cuda.synchronize()
log_time('act_time', time.time() - t)
# Step 2: run environment
t = time.time()
if training_config['use_async_env']:
async_env.async_step(action)
else:
next_state, reward, done, _ = env.step(action)
log_time('env_time', time.time() - t)
# Step 3: save to buffer
# For asynchronous env, defer saving
if not training_config['use_async_env']:
t = time.time()
if use_cpp_buffer:
replay_buffer.add(obs=state,
act=action,
rew=reward,
next_obs=next_state,
done=done)
else:
replay_buffer.push(state, action, reward, next_state, done)
log_time('save_time', time.time() - t)
if use_cpp_buffer:
buffer_stored_size = replay_buffer.get_stored_size()
else:
buffer_stored_size = len(replay_buffer)
beta = np.nan
buffer_beta = np.nan
t = time.time()
if buffer_stored_size > replay_initial:
if training_config['per']:
buffer_beta = buffer_beta_scheduler.get(frame_idx)
if robust:
convex_final_beta = training_config['convex_final_beta']
convex_start_beta = training_config['convex_start_beta']
beta = (
max_eps - eps *
(1.0 - convex_final_beta)) / max_eps * convex_start_beta
res = compute_td_loss(current_model,
target_model,
batch_size,
replay_buffer,
per,
use_cpp_buffer,
use_async_rb,
optimizer,
gamma,
memory_mgr,
robust,
buffer_beta=buffer_beta,
grad_clip=grad_clip,
natural_loss_fn=natural_loss_fn,
eps=eps,
beta=beta,
sa=sa,
kappa=kappa,
dtype=dtype,
hinge=hinge,
hinge_c=training_config.get('hinge_c', 1),
env_id=env_id,
bound_solver=bound_solver,
attack_config=attack_config)
loss, grad_norm, weights_norm, td_loss, batch_cur_q_value, batch_exp_q_value = res[
0], res[1], res[2], res[3], res[4], res[5]
if robust:
reg_loss = res[-1]
reg_losses.append(reg_loss.data.item())
if bound_solver == 'pgd':
ori_margin, adv_margin = res[-3].data.item(
), res[-2].data.item()
losses.append(loss.data.item())
td_losses.append(td_loss.data.item())
batch_cur_q.append(batch_cur_q_value.data.item())
batch_exp_q.append(batch_exp_q_value.data.item())
log_time('loss_time', time.time() - t)
# Step 2: run environment (async)
t = time.time()
if training_config['use_async_env']:
next_state, reward, done, _ = async_env.wait_step()
log_time('env_time', time.time() - t)
# Step 3: save to buffer (async)
if training_config['use_async_env']:
t = time.time()
if use_cpp_buffer:
replay_buffer.add(obs=state,
act=action,
rew=reward,
next_obs=next_state,
done=done)
else:
replay_buffer.push(state, action, reward, next_state, done)
log_time('save_time', time.time() - t)
# Update states and reward
t = time.time()
state = next_state
episode_reward += reward
if done:
if training_config['use_async_env']:
state = async_env.reset()
else:
state = env.reset()
all_rewards.append(episode_reward)
episode_reward = 0
log_time('env_time', time.time() - t)
# All kinds of result logging
if frame_idx % training_config[
'print_frame'] == 0 or frame_idx == num_frames or (
robust and abs(frame_idx - schedule_start) < 5
) or abs(buffer_stored_size - replay_initial) < 5:
logger.log(
'\nframe {}/{}, learning rate: {:.6g}, buffer beta: {:.6g}, action epsilon: {:.6g}'
.format(frame_idx, num_frames, lr, buffer_beta, act_epsilon))
logger.log(
'total time: {:.2f}, epoch time: {:.4f}, speed: {:.2f} frames/sec, last total loss: {:.6g}, avg total loss: {:.6g}, grad norm: {:.6g}, weights_norm: {:.6g}, latest episode reward: {:.6g}, avg 10 episode reward: {:.6g}'
.format(
time.time() - start_time,
time.time() - period_start_time,
training_config['print_frame'] /
(time.time() - period_start_time),
losses[-1] if losses else np.nan,
np.average(losses[:-training_config['print_frame'] -
1:-1]) if losses else np.nan, grad_norm,
weights_norm, all_rewards[-1] if all_rewards else np.nan,
np.average(all_rewards[:-11:-1])
if all_rewards else np.nan))
logger.log('last td loss: {:.6g}, avg td loss: {:.6g}'.format(
td_losses[-1] if td_losses else np.nan,
np.average(td_losses[:-training_config['print_frame'] -
1:-1]) if td_losses else np.nan))
logger.log(
'last batch cur q: {:.6g}, avg batch cur q: {:.6g}'.format(
batch_cur_q[-1] if batch_cur_q else np.nan,
np.average(batch_cur_q[:-training_config['print_frame'] -
1:-1]) if batch_cur_q else np.nan))
logger.log(
'last batch exp q: {:.6g}, avg batch exp q: {:.6g}'.format(
batch_exp_q[-1] if batch_exp_q else np.nan,
np.average(batch_exp_q[:-training_config['print_frame'] -
1:-1]) if batch_exp_q else np.nan))
if robust:
logger.log('current input epsilon: {:.6g}'.format(eps))
if bound_solver == 'pgd':
logger.log(
'last logit margin: ori: {:.6g}, adv: {:.6g}'.format(
ori_margin, adv_margin))
else:
logger.log('current bound beta: {:.6g}'.format(beta))
logger.log(
'last cert reg loss: {:.6g}, avg cert reg loss: {:.6g}'.
format(
reg_losses[-1] if reg_losses else np.nan,
np.average(
reg_losses[:-training_config['print_frame'] -
1:-1]) if reg_losses else np.nan))
logger.log('current kappa: {:.6g}'.format(kappa))
if adv_train:
logger.log(
'current attack epsilon (same as input epsilon): {:.6g}'.
format(eps))
diff = ori_state_tensor - state_tensor
diff = np.abs(diff.data.cpu().numpy())
logger.log('current Linf distortion: {:.6g}'.format(
np.max(diff)))
logger.log(
'this batch attacked: {}, success: {}, attack success rate: {:.6g}'
.format(
attack_count, suc_count, suc_count * 1.0 /
attack_count if attack_count > 0 else np.nan))
attack_count = 0
suc_count = 0
logger.log('attack stats reseted.')
period_start_time = time.time()
log_time.print()
log_time.clear()
if frame_idx % training_config[
'save_frame'] == 0 or frame_idx == num_frames:
plot(frame_idx, all_rewards, losses, prefix)
torch.save(current_model.features.state_dict(),
'{}/frame_{}.pth'.format(prefix, frame_idx))
if frame_idx % training_config['update_target_frame'] == 0:
update_target(current_model, target_model)
if frame_idx % training_config.get('mini_test', 100000) == 0 and (
(robust and beta == 0) or
(not robust and frame_idx * 1.0 / num_frames >= 0.8)):
test_reward = mini_test(current_model, config, logger, dtype)
logger.log('this test avg reward: {:6g}'.format(test_reward))
if test_reward >= best_test_reward:
best_test_reward = test_reward
logger.log(
'new best reward {:6g} achieved, update checkpoint'.format(
test_reward))
torch.save(current_model.features.state_dict(),
'{}/best_frame_{}.pth'.format(prefix, frame_idx))
log_time.log_time('total', time.time() - frame_start)
def test_initial_priorities(self):
prb = PrioritizedReplayBuffer(8)
for exp in Transitions:
prb.add(exp)
assert (prb._st_sum._storage[-8:] == np.array([1.] * 8)).all()
def learn(logger, device, env, number_timesteps, network, optimizer, save_path,
save_interval, ob_scale, gamma, grad_norm, double_q, param_noise,
exploration_fraction, exploration_final_eps, batch_size, train_freq,
learning_starts, target_network_update_freq, buffer_size,
prioritized_replay, prioritized_replay_alpha,
prioritized_replay_beta0, atom_num, min_value, max_value):
"""
Papers:
Mnih V, Kavukcuoglu K, Silver D, et al. Human-level control through deep
reinforcement learning[J]. Nature, 2015, 518(7540): 529.
Hessel M, Modayil J, Van Hasselt H, et al. Rainbow: Combining Improvements
in Deep Reinforcement Learning[J]. 2017.
Parameters:
----------
double_q (bool): if True double DQN will be used
param_noise (bool): whether or not to use parameter space noise
dueling (bool): if True dueling value estimation will be used
exploration_fraction (float): fraction of entire training period over which
the exploration rate is annealed
exploration_final_eps (float): final value of random action probability
batch_size (int): size of a batched sampled from replay buffer for training
train_freq (int): update the model every `train_freq` steps
learning_starts (int): how many steps of the model to collect transitions
for before learning starts
target_network_update_freq (int): update the target network every
`target_network_update_freq` steps
buffer_size (int): size of the replay buffer
prioritized_replay (bool): if True prioritized replay buffer will be used.
prioritized_replay_alpha (float): alpha parameter for prioritized replay
prioritized_replay_beta0 (float): beta parameter for prioritized replay
atom_num (int): atom number in distributional RL for atom_num > 1
min_value (float): min value in distributional RL
max_value (float): max value in distributional RL
"""
qnet = network.to(device)
qtar = deepcopy(qnet)
if prioritized_replay:
buffer = PrioritizedReplayBuffer(buffer_size, device,
prioritized_replay_alpha,
prioritized_replay_beta0)
else:
buffer = ReplayBuffer(buffer_size, device)
generator = _generate(device, env, qnet, ob_scale, number_timesteps,
param_noise, exploration_fraction,
exploration_final_eps, atom_num, min_value,
max_value)
if atom_num > 1:
delta_z = float(max_value - min_value) / (atom_num - 1)
z_i = torch.linspace(min_value, max_value, atom_num).to(device)
infos = {'eplenmean': deque(maxlen=100), 'eprewmean': deque(maxlen=100)}
start_ts = time.time()
for n_iter in range(1, number_timesteps + 1):
if prioritized_replay:
buffer.beta += (1 - prioritized_replay_beta0) / number_timesteps
*data, info = generator.__next__()
buffer.add(*data)
for k, v in info.items():
infos[k].append(v)
# update qnet
if n_iter > learning_starts and n_iter % train_freq == 0:
b_o, b_a, b_r, b_o_, b_d, *extra = buffer.sample(batch_size)
b_o.mul_(ob_scale)
b_o_.mul_(ob_scale)
if atom_num == 1:
with torch.no_grad():
if double_q:
b_a_ = qnet(b_o_).argmax(1).unsqueeze(1)
b_q_ = (1 - b_d) * qtar(b_o_).gather(1, b_a_)
else:
b_q_ = (1 - b_d) * qtar(b_o_).max(1, keepdim=True)[0]
b_q = qnet(b_o).gather(1, b_a)
abs_td_error = (b_q - (b_r + gamma * b_q_)).abs()
priorities = abs_td_error.detach().cpu().clamp(1e-6).numpy()
if extra:
loss = (extra[0] * huber_loss(abs_td_error)).mean()
else:
loss = huber_loss(abs_td_error).mean()
else:
with torch.no_grad():
b_dist_ = qtar(b_o_).exp()
b_a_ = (b_dist_ * z_i).sum(-1).argmax(1)
b_tzj = (gamma * (1 - b_d) * z_i[None, :] + b_r).clamp(
min_value, max_value)
b_i = (b_tzj - min_value) / delta_z
b_l = b_i.floor()
b_u = b_i.ceil()
b_m = torch.zeros(batch_size, atom_num).to(device)
temp = b_dist_[torch.arange(batch_size), b_a_, :]
b_m.scatter_add_(1, b_l.long(), temp * (b_u - b_i))
b_m.scatter_add_(1, b_u.long(), temp * (b_i - b_l))
b_q = qnet(b_o)[torch.arange(batch_size), b_a.squeeze(1), :]
kl_error = -(b_q * b_m).sum(1)
# use kl error as priorities as proposed by Rainbow
priorities = kl_error.detach().cpu().clamp(1e-6).numpy()
loss = kl_error.mean()
optimizer.zero_grad()
loss.backward()
if grad_norm is not None:
nn.utils.clip_grad_norm_(qnet.parameters(), grad_norm)
optimizer.step()
if prioritized_replay:
buffer.update_priorities(extra[1], priorities)
# update target net and log
if n_iter % target_network_update_freq == 0:
qtar.load_state_dict(qnet.state_dict())
logger.info('{} Iter {} {}'.format('=' * 10, n_iter, '=' * 10))
fps = int(n_iter / (time.time() - start_ts))
logger.info('Total timesteps {} FPS {}'.format(n_iter, fps))
for k, v in infos.items():
v = (sum(v) / len(v)) if v else float('nan')
logger.info('{}: {:.6f}'.format(k, v))
if n_iter > learning_starts and n_iter % train_freq == 0:
logger.info('vloss: {:.6f}'.format(loss.item()))
if save_interval and n_iter % save_interval == 0:
torch.save(
[qnet.state_dict(), optimizer.state_dict()],
os.path.join(save_path, '{}.checkpoint'.format(n_iter)))
def train(env, args, writer):
p1_current_model = DQN(env, args).to(args.device)
p1_target_model = DQN(env, args).to(args.device)
update_target(p1_current_model, p1_target_model)
p2_current_model = DQN(env, args).to(args.device)
p2_target_model = DQN(env, args).to(args.device)
update_target(p2_current_model, p2_target_model)
if args.noisy:
p1_current_model.update_noisy_modules()
p1_target_model.update_noisy_modules()
p2_current_model.update_noisy_modules()
p2_target_model.update_noisy_modules()
if args.load_model and os.path.isfile(args.load_model):
load_model(p1_current_model, args, 1)
load_model(p2_current_model, args, 2)
epsilon_by_frame = epsilon_scheduler(args.eps_start, args.eps_final, args.eps_decay)
beta_by_frame = beta_scheduler(args.beta_start, args.beta_frames)
if args.prioritized_replay:
p1_replay_buffer = PrioritizedReplayBuffer(args.buffer_size, args.alpha)
p2_replay_buffer = PrioritizedReplayBuffer(args.buffer_size, args.alpha)
else:
p1_replay_buffer = ReplayBuffer(args.buffer_size)
p2_replay_buffer = ReplayBuffer(args.buffer_size)
p1_state_deque = deque(maxlen=args.multi_step)
p2_state_deque = deque(maxlen=args.multi_step)
p1_reward_deque = deque(maxlen=args.multi_step)
p1_action_deque = deque(maxlen=args.multi_step)
p2_reward_deque = deque(maxlen=args.multi_step)
p2_action_deque = deque(maxlen=args.multi_step)
p1_optimizer = optim.Adam(p1_current_model.parameters(), lr=args.lr)
p2_optimizer = optim.Adam(p2_current_model.parameters(), lr=args.lr)
length_list = []
p1_reward_list, p1_loss_list = [], []
p2_reward_list, p2_loss_list = [], []
p1_episode_reward, p2_episode_reward = 0, 0
episode_length = 0
prev_time = time.time()
prev_frame = 1
(p1_state, p2_state) = env.reset()
for frame_idx in range(1, args.max_frames + 1):
if args.noisy:
p1_current_model.sample_noise()
p1_target_model.sample_noise()
p2_current_model.sample_noise()
p2_target_model.sample_noise()
epsilon = epsilon_by_frame(frame_idx)
p1_action = p1_current_model.act(torch.FloatTensor(p1_state).to(args.device), epsilon)
p2_action = p2_current_model.act(torch.FloatTensor(p2_state).to(args.device), epsilon)
if args.render:
env.render()
actions = {"1": p1_action, "2": p2_action}
(p1_next_state, p2_next_state), reward, done, _ = env.step(actions)
p1_state_deque.append(p1_state)
p2_state_deque.append(p2_state)
if args.negative:
p1_reward_deque.append(reward[0] - 1)
else:
p1_reward_deque.append(reward[0])
p1_action_deque.append(p1_action)
if args.negative:
p2_reward_deque.append(reward[1] - 1)
else:
p2_reward_deque.append(reward[1])
p2_action_deque.append(p2_action)
if len(p1_state_deque) == args.multi_step or done:
n_reward = multi_step_reward(p1_reward_deque, args.gamma)
n_state = p1_state_deque[0]
n_action = p1_action_deque[0]
p1_replay_buffer.push(n_state, n_action, n_reward, p1_next_state, np.float32(done))
n_reward = multi_step_reward(p2_reward_deque, args.gamma)
n_state = p2_state_deque[0]
n_action = p2_action_deque[0]
p2_replay_buffer.push(n_state, n_action, n_reward, p2_next_state, np.float32(done))
(p1_state, p2_state) = (p1_next_state, p2_next_state)
p1_episode_reward += (reward[0])
p2_episode_reward += (reward[1])
if args.negative:
p1_episode_reward -= 1
p2_episode_reward -= 1
episode_length += 1
if done or episode_length > args.max_episode_length:
(p1_state, p2_state) = env.reset()
p1_reward_list.append(p1_episode_reward)
p2_reward_list.append(p2_episode_reward)
length_list.append(episode_length)
writer.add_scalar("data/p1_episode_reward", p1_episode_reward, frame_idx)
writer.add_scalar("data/p2_episode_reward", p2_episode_reward, frame_idx)
writer.add_scalar("data/episode_length", episode_length, frame_idx)
p1_episode_reward, p2_episode_reward, episode_length = 0, 0, 0
p1_state_deque.clear()
p2_state_deque.clear()
p1_reward_deque.clear()
p2_reward_deque.clear()
p1_action_deque.clear()
p2_action_deque.clear()
if len(p1_replay_buffer) > args.learning_start and frame_idx % args.train_freq == 0:
beta = beta_by_frame(frame_idx)
loss = compute_td_loss(p1_current_model, p1_target_model, p1_replay_buffer, p1_optimizer, args, beta)
p1_loss_list.append(loss.item())
writer.add_scalar("data/p1_loss", loss.item(), frame_idx)
loss = compute_td_loss(p2_current_model, p2_target_model, p2_replay_buffer, p2_optimizer, args, beta)
p2_loss_list.append(loss.item())
writer.add_scalar("data/p2_loss", loss.item(), frame_idx)
if frame_idx % args.update_target == 0:
update_target(p1_current_model, p1_target_model)
update_target(p2_current_model, p2_target_model)
if frame_idx % args.evaluation_interval == 0:
print_log(frame_idx, prev_frame, prev_time, p1_reward_list, length_list, p1_loss_list)
print_log(frame_idx, prev_frame, prev_time, p2_reward_list, length_list, p2_loss_list)
p1_reward_list.clear(), p2_reward_list.clear(), length_list.clear()
p1_loss_list.clear(), p2_loss_list.clear()
prev_frame = frame_idx
prev_time = time.time()
save_model(p1_current_model, args, 1)
save_model(p2_current_model, args, 2)
save_model(p1_current_model, args, 1)
save_model(p2_current_model, args, 2)
def train(env, args):
# Init WandB
wandb.init(config=args)
current_model = DQN(env, args).to(args.device)
target_model = DQN(env, args).to(args.device)
if args.noisy:
current_model.update_noisy_modules()
target_model.update_noisy_modules()
if args.load_model and os.path.isfile(args.load_model):
load_model(current_model, args)
epsilon_by_frame = epsilon_scheduler(args.eps_start, args.eps_final,
args.eps_decay)
beta_by_frame = beta_scheduler(args.beta_start, args.beta_frames)
if args.prioritized_replay:
replay_buffer = PrioritizedReplayBuffer(args.buffer_size, args.alpha)
else:
replay_buffer = ReplayBuffer(args.buffer_size)
state_deque = deque(maxlen=args.multi_step)
reward_deque = deque(maxlen=args.multi_step)
action_deque = deque(maxlen=args.multi_step)
optimizer = optim.Adam(current_model.parameters(), lr=args.lr)
reward_list, length_list, loss_list = [], [], []
episode_reward = 0
episode_length = 0
prev_time = time.time()
prev_frame = 1
state = env.reset()
for frame_idx in range(1, args.max_frames + 1):
if args.render:
env.render()
if args.noisy:
current_model.sample_noise()
target_model.sample_noise()
epsilon = epsilon_by_frame(frame_idx)
action = current_model.act(
torch.FloatTensor(state).to(args.device), epsilon)
next_state, reward, done, _ = env.step(action)
state_deque.append(state)
reward_deque.append(reward)
action_deque.append(action)
if len(state_deque) == args.multi_step or done:
n_reward = multi_step_reward(reward_deque, args.gamma)
n_state = state_deque[0]
n_action = action_deque[0]
replay_buffer.push(n_state, n_action, n_reward, next_state,
np.float32(done))
state = next_state
episode_reward += reward
episode_length += 1
if done:
state = env.reset()
reward_list.append(episode_reward)
length_list.append(episode_length)
wandb.log({
'episode_reward': episode_reward,
'episode_length': episode_length,
})
episode_reward, episode_length = 0, 0
state_deque.clear()
reward_deque.clear()
action_deque.clear()
if len(replay_buffer
) > args.learning_start and frame_idx % args.train_freq == 0:
beta = beta_by_frame(frame_idx)
loss = compute_td_loss(current_model, target_model, replay_buffer,
optimizer, args, beta)
loss_list.append(loss.item())
wandb.log({'loss': loss.item()})
if frame_idx % args.update_target == 0:
update_target(current_model, target_model)
if frame_idx % args.evaluation_interval == 0:
print_log(frame_idx, prev_frame, prev_time, reward_list,
length_list, loss_list)
reward_list.clear(), length_list.clear(), loss_list.clear()
prev_frame = frame_idx
prev_time = time.time()
save_model(current_model, args)
save_model(current_model, args)
class DQN:
def __init__(self, config):
self.writer = SummaryWriter()
self.device = 'cuda' if T.cuda.is_available() else 'cpu'
self.dqn_type = config["dqn-type"]
self.run_title = config["run-title"]
self.env = gym.make(config["environment"])
self.num_states = np.prod(self.env.observation_space.shape)
self.num_actions = self.env.action_space.n
layers = [
self.num_states,
*config["architecture"],
self.num_actions
]
self.policy_net = Q_Network(self.dqn_type, layers).to(self.device)
self.target_net = Q_Network(self.dqn_type, layers).to(self.device)
self.target_net.load_state_dict(self.policy_net.state_dict())
self.target_net.eval()
capacity = config["max-experiences"]
self.p_replay_eps = config["p-eps"]
self.prioritized_replay = config["prioritized-replay"]
self.replay_buffer = PrioritizedReplayBuffer(capacity, config["p-alpha"]) if self.prioritized_replay \
else ReplayBuffer(capacity)
self.beta_scheduler = LinearSchedule(config["episodes"], initial_p=config["p-beta-init"], final_p=1.0)
self.epsilon_decay = lambda e: max(config["epsilon-min"], e * config["epsilon-decay"])
self.train_freq = config["train-freq"]
self.use_soft_update = config["use-soft-update"]
self.target_update = config["target-update"]
self.tau = config["tau"]
self.gamma = config["gamma"]
self.batch_size = config["batch-size"]
self.time_step = 0
self.optim = T.optim.AdamW(self.policy_net.parameters(), lr=config["lr-init"], weight_decay=config["weight-decay"])
self.lr_scheduler = T.optim.lr_scheduler.StepLR(self.optim, step_size=config["lr-step"], gamma=config["lr-gamma"])
self.criterion = nn.SmoothL1Loss(reduction="none") # Huber Loss
self.min_experiences = max(config["min-experiences"], config["batch-size"])
self.save_path = config["save-path"]
def act(self, state, epsilon=0):
"""
Act on environment using epsilon-greedy policy
"""
if np.random.sample() < epsilon:
return int(np.random.choice(np.arange(self.num_actions)))
else:
self.policy_net.eval()
return self.policy_net(T.tensor(state, device=self.device).float().unsqueeze(0)).argmax().item()
def _soft_update(self, tau):
"""
Polyak averaging: soft update model parameters.
θ_target = τ*θ_current + (1 - τ)*θ_target
"""
for target_param, current_param in zip(self.target_net.parameters(), self.policy_net.parameters()):
target_param.data.copy_(tau*target_param.data + (1.0-tau)*current_param.data)
def update_target(self, tau):
if self.use_soft_update:
self._soft_update(tau)
elif self.time_step % self.target_update == 0:
self.target_net.load_state_dict(self.policy_net.state_dict())
def optimize(self, beta=None):
if len(self.replay_buffer) < self.min_experiences:
return None, None
self.policy_net.train()
if self.prioritized_replay:
transitions, (is_weights, t_idxes) = self.replay_buffer.sample(self.batch_size, beta)
else:
transitions = self.replay_buffer.sample(self.batch_size)
is_weights, t_idxes = np.ones(self.batch_size), None
# transpose the batch --> transition of batch-arrays
batch = Transition(*zip(*transitions))
# compute a mask of non-final states and concatenate the batch elements
non_final_mask = T.tensor(tuple(map(lambda state: state is not None, batch.next_state)),
device=self.device, dtype=T.bool)
non_final_next_states = T.cat([T.tensor([state]).float() for state in batch.next_state if state is not None]).to(self.device)
state_batch = T.tensor(batch.state, device=self.device).float()
action_batch = T.tensor(batch.action, device=self.device).long()
reward_batch = T.tensor(batch.reward, device=self.device).float()
state_action_values = self.policy_net(state_batch).gather(1, action_batch.unsqueeze(1))
next_state_values = T.zeros(self.batch_size, device=self.device)
if self.dqn_type == "vanilla":
next_state_values[non_final_mask] = self.target_net(non_final_next_states).max(1)[0].detach()
else:
self.policy_net.eval()
action_next_state = self.policy_net(non_final_next_states).max(1)[1]
self.policy_net.train()
next_state_values[non_final_mask] = self.target_net(non_final_next_states).gather(1, action_next_state.unsqueeze(1)).squeeze().detach()
# compute the expected Q values (RHS of the Bellman equation)
expected_state_action_values = (next_state_values * self.gamma) + reward_batch
# compute temporal difference error
td_error = T.abs(state_action_values.squeeze() - expected_state_action_values).detach().cpu().numpy()
# compute Huber loss
loss = self.criterion(state_action_values, expected_state_action_values.unsqueeze(1))
loss = T.mean(loss * T.tensor(is_weights, device=self.device))
# optimize the model
self.optim.zero_grad()
loss.backward()
for param in self.policy_net.parameters():
param.grad.data.clamp_(-1, 1)
self.optim.step()
return td_error, t_idxes
def run_episode(self, epsilon, beta):
total_reward, done = 0, False
state = self.env.reset()
while not done:
# use epsilon-greedy to get an action
action = self.act(state, epsilon)
# caching the information of current state
prev_state = state
# take action
state, reward, done, _ = self.env.step(action)
# accumulate reward
total_reward += reward
# store the transition in buffer
if done: state = None
self.replay_buffer.push(prev_state, action, state, reward)
# optimize model
if self.time_step % self.train_freq == 0:
td_error, t_idxes = self.optimize(beta=beta)
# update priorities
if self.prioritized_replay and td_error is not None:
self.replay_buffer.update_priorities(t_idxes, td_error + self.p_replay_eps)
# update target network
self.update_target(self.tau)
# increment time-step
self.time_step += 1
return total_reward
def train(self, episodes, epsilon, solved_reward):
total_rewards = np.zeros(episodes)
for episode in range(episodes):
# compute beta using linear scheduler
beta = self.beta_scheduler.value(episode)
# run episode and get rewards
reward = self.run_episode(epsilon, beta)
# exponentially decay epsilon
epsilon = self.epsilon_decay(epsilon)
# reduce learning rate by
self.lr_scheduler.step()
total_rewards[episode] = reward
avg_reward = total_rewards[max(0, episode-100):(episode+1)].mean()
last_lr = self.lr_scheduler.get_last_lr()[0]
# log into tensorboard
self.writer.add_scalar(f'dqn-{self.dqn_type}/reward', reward, episode)
self.writer.add_scalar(f'dqn-{self.dqn_type}/reward_100', avg_reward, episode)
self.writer.add_scalar(f'dqn-{self.dqn_type}/lr', last_lr, episode)
self.writer.add_scalar(f'dqn-{self.dqn_type}/epsilon', epsilon, episode)
print(f"Episode: {episode} | Last 100 Average Reward: {avg_reward:.5f} | Learning Rate: {last_lr:.5E} | Epsilon: {epsilon:.5E}", end='\r')
if avg_reward > solved_reward:
break
self.writer.close()
print(f"Environment solved in {episode} episodes")
T.save(self.policy_net.state_dict(), os.path.join(self.save_path, f"{self.run_title}.pt"))
def visualize(self, load_path=None):
done = False
state = self.env.reset()
if load_path is not None:
self.policy_net.load_state_dict(T.load(load_path, map_location=self.device))
self.policy_net.eval()
while not done:
self.env.render()
action = self.act(state)
state, _, done, _ = self.env.step(int(action))
sleep(0.01)
class Trainer(threading.Thread):
def __init__(self, config: Dict, agent: Agent, transitions_queue: Queue,
global_episode: Counter, global_update_step: Counter,
epsilone: Union[ExponentialEpsilon,
SinusoidalEpsilone], logger: Logger) -> None:
"""
Thread responsable de l'update des poids des réseaux de neurones de l'agent
:param config: Dictionnaire de configuration de l'expérience
:param agent: Agent à optimiser
:param transitions_queue: Queue à partir de laquelle les threads Player envoient leurs transitions au thread Trainer
:param global_episode: Compteur du nombre d'époside joués (partagé entre les threads)
:param global_update_step: Compteur du nombre d'update effectués (partagé entre les threads)
:param epsilone: Epsilone processus utilisé pour le bruit ajouté aux actions de l'agent
:param logger: Le logger utilisé au cours de l'expérience
"""
super().__init__()
self._config = config
self._agent = agent
self._episode_queue = transitions_queue
self._global_episode = global_episode
self._global_update_step = global_update_step
self._logger = logger
self._epsilone = epsilone
self._replay_buffer = PrioritizedReplayBuffer(
size=self._config["trainer_config"]["buffer_size"])
# TODO: permettre de switcher entre ReplayBuffer et PrioritizedReplayBuffer via la config
# ReplayBuffer(size=self._config["trainer_config"]["buffer_size"])
self._best_test_reward = float('-inf')
def test(self) -> None:
"""
Teste l'agent sur un episode complet sans bruit
"""
start_test_time = time()
env = make_env(self._config)
obs, done = env.reset(), False
rews = []
nb_step = 0
while not done:
act = self._agent(obs=obs)
obs, rew, done, _ = env.step(act)
rews.append(rew)
nb_step += 1
rew_mean = np.mean(rews)
# logging
self._logger.add_scalar(label="test/reward",
value=sum(rews),
step=self._global_update_step.val())
self._logger.add_scalar(label="test/nb_step",
value=nb_step,
step=self._global_update_step.val())
self._logger.add_scalar(label="test/reward_mean",
value=float(rew_mean),
step=self._global_update_step.val())
self._logger.add_scalar(label="test/reward_var",
value=float(np.var(rews)),
step=self._global_update_step.val())
if self._best_test_reward < int(rew_mean):
self._agent.save(episode=self._global_episode.val(),
update_step=self._global_update_step.val(),
test_reward=int(sum(rews)))
self._logger.add_scalar(label="test/test_speed",
value=time() - start_test_time,
step=self._global_update_step.val())
def _should_stop(self) -> bool:
"""
Check si le thread doit terminer
:return: True si le thread doit terminer, False sinon
"""
if self._config["trainer_config"]["max_update_step"] and \
self._global_update_step.val() > self._config["trainer_config"]["max_update_step"]:
return True
if self._config["trainer_config"]["max_episode"] and \
self._global_episode.val() > self._config["trainer_config"]["max_episode"]:
return True
if self._config["trainer_config"]["max_time"] and \
time() - self._start_training_time > self._config["trainer_config"]["max_time"]:
return True
return False
def run(self) -> None:
"""
Lance le thread
"""
self._start_training_time = time()
# Initialise le replay buffer avec la policy random jusqu'à qu'il contienne min_replay_size transitions
p_bar = tqdm(total=self._config["agent_config"]["min_replay_size"])
env = make_env(self._config)
while len(self._replay_buffer
) < self._config["agent_config"]["min_replay_size"]:
obs, done = env.reset(), False
while not done:
act = env.action_space.sample()
if len(act.shape) < 1:
act = [act]
next_obs, rew, done, _ = env.step(act)
transition = Transition(observation=obs,
action=act,
new_observation=next_obs,
reward=rew,
done=done)
obs = next_obs
self._replay_buffer.add(transition)
p_bar.update(1)
print("buffer initialization done")
while True:
start_get_replays_time = time()
# Récupération d'une transition dans la queue et placement de cette transition dans le replay buffer
while True:
if self._should_stop():
break
try:
transition = self._episode_queue.get_nowait()
self._replay_buffer.add(transition)
break
except Empty:
sleep(0.01)
pass
if self._should_stop():
break
end_get_replays_time = time()
start_update_time = time()
indexes_b, transition_b, weights_b = self._replay_buffer.sample(
self._config["agent_config"]["batch_size"])
if self._global_update_step.val(
) % self._config["trainer_config"]["log_freq"] == 0:
update_step = self._global_update_step.val()
else:
update_step = None
td_error = self._agent.update(transition_b, weights_b, update_step)
# Update les priorités du replay buffer avec l'erreur du critic
new_priorities = np.abs(
td_error
) + 1e-16 # attention les priorités doivent toujours être strictement positives
self._replay_buffer.update(indexes_b, new_priorities)
# logging
if update_step:
self._logger.add_scalar(label="multithreading/queue_size",
value=self._episode_queue.qsize(),
step=update_step)
self._logger.add_scalar(label="trainer/buffer_size",
value=len(self._replay_buffer),
step=update_step)
self._logger.add_scalar(label="trainer/priority_mean",
value=weights_b.mean(),
step=update_step)
self._logger.add_scalar(label="trainer/priority_var",
value=weights_b.var(),
step=update_step)
self._logger.add_scalar(label="trainer/td_error_mean",
value=np.abs(td_error).mean(),
step=update_step)
self._logger.add_scalar(label="trainer/update_step",
value=self._global_episode.val(),
step=update_step)
self._logger.add_scalar(label="trainer/update_time",
value=time() - start_update_time,
step=update_step)
self._logger.add_scalar(label="trainer/idle_time",
value=end_get_replays_time -
start_get_replays_time,
step=update_step)
self._global_update_step.inc()
self._epsilone.step()
if self._global_update_step.val(
) % self._config["trainer_config"]["test_freq"] == 0:
self.test()
self.test()
print("trainer end")
def learn(env,
num_actions=3,
lr=5e-4,
max_timesteps=100000,
buffer_size=50000,
exploration_fraction=0.1,
exploration_final_eps=0.02,
train_freq=1,
batch_size=32,
print_freq=1,
checkpoint_freq=10000,
learning_starts=1000,
gamma=1.0,
target_network_update_freq=500,
prioritized_replay=False,
prioritized_replay_alpha=0.6,
prioritized_replay_beta0=0.4,
prioritized_replay_beta_iters=None,
prioritized_replay_eps=1e-6,
num_cpu=16):
torch.set_num_threads(num_cpu)
if prioritized_replay:
replay_buffer = PrioritizedReplayBuffer(
buffer_size, alpha=prioritized_replay_alpha)
if prioritized_replay_beta_iters is None:
prioritized_replay_beta_iters = max_timesteps
beta_schedule = LinearSchedule(
prioritized_replay_beta_iters,
initial_p=prioritized_replay_beta0,
final_p=1.0)
else:
replay_buffer = ReplayBuffer(buffer_size)
beta_schedule = None
exploration = LinearSchedule(
schedule_timesteps=int(exploration_fraction * max_timesteps),
initial_p=1.0,
final_p=exploration_final_eps)
episode_rewards = [0.0]
saved_mean_reward = None
obs = env.reset()
player_relative = obs[0].observation["screen"][_PLAYER_RELATIVE]
screen = player_relative
obs, xy_per_marine = common.init(env, obs)
group_id = 0
reset = True
dqn = DQN(num_actions, lr, cuda)
print('\nCollecting experience...')
checkpoint_path = 'models/deepq/checkpoint.pth.tar'
if os.path.exists(checkpoint_path):
dqn, saved_mean_reward = load_checkpoint(dqn, cuda, filename=checkpoint_path)
for t in range(max_timesteps):
# Take action and update exploration to the newest value
# custom process for DefeatZerglingsAndBanelings
obs, screen, player = common.select_marine(env, obs)
# action = act(
# np.array(screen)[None], update_eps=update_eps, **kwargs)[0]
action = dqn.choose_action(np.array(screen)[None])
reset = False
rew = 0
new_action = None
obs, new_action = common.marine_action(env, obs, player, action)
army_count = env._obs[0].observation.player_common.army_count
try:
if army_count > 0 and _ATTACK_SCREEN in obs[0].observation["available_actions"]:
obs = env.step(actions=new_action)
else:
new_action = [sc2_actions.FunctionCall(_NO_OP, [])]
obs = env.step(actions=new_action)
except Exception as e:
# print(e)
1 # Do nothing
player_relative = obs[0].observation["screen"][_PLAYER_RELATIVE]
new_screen = player_relative
rew += obs[0].reward
done = obs[0].step_type == environment.StepType.LAST
selected = obs[0].observation["screen"][_SELECTED]
player_y, player_x = (selected == _PLAYER_FRIENDLY).nonzero()
if len(player_y) > 0:
player = [int(player_x.mean()), int(player_y.mean())]
if len(player) == 2:
if player[0] > 32:
new_screen = common.shift(LEFT, player[0] - 32, new_screen)
elif player[0] < 32:
new_screen = common.shift(RIGHT, 32 - player[0],
new_screen)
if player[1] > 32:
new_screen = common.shift(UP, player[1] - 32, new_screen)
elif player[1] < 32:
new_screen = common.shift(DOWN, 32 - player[1], new_screen)
# Store transition in the replay buffer.
replay_buffer.add(screen, action, rew, new_screen, float(done))
screen = new_screen
episode_rewards[-1] += rew
reward = episode_rewards[-1]
if done:
print("Episode Reward : %s" % episode_rewards[-1])
obs = env.reset()
player_relative = obs[0].observation["screen"][
_PLAYER_RELATIVE]
screen = player_relative
group_list = common.init(env, obs)
# Select all marines first
# env.step(actions=[sc2_actions.FunctionCall(_SELECT_UNIT, [_SELECT_ALL])])
episode_rewards.append(0.0)
reset = True
if t > learning_starts and t % train_freq == 0:
# Minimize the error in Bellman's equation on a batch sampled from replay buffer.
if prioritized_replay:
experience = replay_buffer.sample(
batch_size, beta=beta_schedule.value(t))
(obses_t, actions, rewards, obses_tp1, dones, weights,
batch_idxes) = experience
else:
obses_t, actions, rewards, obses_tp1, dones = replay_buffer.sample(
batch_size)
weights, batch_idxes = np.ones_like(rewards), None
td_errors = dqn.learn(obses_t, actions, rewards, obses_tp1, gamma, batch_size)
if prioritized_replay:
new_priorities = np.abs(td_errors) + prioritized_replay_eps
replay_buffer.update_priorities(batch_idxes,
new_priorities)
if t > learning_starts and t % target_network_update_freq == 0:
# Update target network periodically.
dqn.update_target()
mean_100ep_reward = round(np.mean(episode_rewards[-101:-1]), 1)
num_episodes = len(episode_rewards)
if done and print_freq is not None and len(
episode_rewards) % print_freq == 0:
logger.record_tabular("steps", t)
logger.record_tabular("episodes", num_episodes)
logger.record_tabular("reward", reward)
logger.record_tabular("mean 100 episode reward",
mean_100ep_reward)
logger.record_tabular("% time spent exploring",
int(100 * exploration.value(t)))
logger.dump_tabular()
if (checkpoint_freq is not None and t > learning_starts
and num_episodes > 100 and t % checkpoint_freq == 0):
if saved_mean_reward is None or mean_100ep_reward > saved_mean_reward:
if print_freq is not None:
logger.log(
"Saving model due to mean reward increase: {} -> {}".format(
saved_mean_reward,
mean_100ep_reward))
save_checkpoint({
'epoch': t + 1,
'state_dict': dqn.save_state_dict(),
'best_accuracy': mean_100ep_reward
}, checkpoint_path)
saved_mean_reward = mean_100ep_reward
def learn(device,
env, seed,
number_timesteps,
network, optimizer,
save_path, save_interval, ob_scale,
gamma, grad_norm,
double_q, param_noise,
exploration_fraction, exploration_final_eps,
batch_size, train_freq, learning_starts, target_network_update_freq,
buffer_size, prioritized_replay, prioritized_replay_alpha,
prioritized_replay_beta0):
"""
Papers:
Mnih V, Kavukcuoglu K, Silver D, et al. Human-level control through deep
reinforcement learning[J]. Nature, 2015, 518(7540): 529.
Hessel M, Modayil J, Van Hasselt H, et al. Rainbow: Combining Improvements
in Deep Reinforcement Learning[J]. 2017.
Parameters:
----------
double_q (bool): if True double DQN will be used
param_noise (bool): whether or not to use parameter space noise
dueling (bool): if True dueling value estimation will be used
exploration_fraction (float): fraction of entire training period over which
the exploration rate is annealed
exploration_final_eps (float): final value of random action probability
batch_size (int): size of a batched sampled from replay buffer for training
train_freq (int): update the model every `train_freq` steps
learning_starts (int): how many steps of the model to collect transitions
for before learning starts
target_network_update_freq (int): update the target network every
`target_network_update_freq` steps
buffer_size (int): size of the replay buffer
prioritized_replay (bool): if True prioritized replay buffer will be used.
prioritized_replay_alpha (float): alpha parameter for prioritized replay
prioritized_replay_beta0 (float): beta parameter for prioritized replay
"""
name = '{}_{}'.format(os.path.split(__file__)[-1][:-3], seed)
logger = get_logger(name)
logger.info('Note that Rainbow features supported in current version is '
'consitent with openai/baselines, which means `Multi-step` and '
'`Distributional` are missing. Welcome any contributions!')
qnet = network.to(device)
qtar = deepcopy(qnet)
if prioritized_replay:
buffer = PrioritizedReplayBuffer(buffer_size, device,
prioritized_replay_alpha,
prioritized_replay_beta0)
else:
buffer = ReplayBuffer(buffer_size, device)
generator = _generate(device, env, qnet, ob_scale,
number_timesteps, param_noise,
exploration_fraction, exploration_final_eps)
infos = {'eplenmean': deque(maxlen=100), 'eprewmean': deque(maxlen=100)}
start_ts = time.time()
for n_iter in range(1, number_timesteps + 1):
if prioritized_replay:
buffer.beta += (1 - prioritized_replay_beta0) / number_timesteps
*data, info = generator.__next__()
buffer.add(*data)
for k, v in info.items():
infos[k].append(v)
# update qnet
if n_iter > learning_starts and n_iter % train_freq == 0:
b_o, b_a, b_r, b_o_, b_d, *extra = buffer.sample(batch_size)
b_o.mul_(ob_scale)
b_o_.mul_(ob_scale)
b_q = qnet(b_o).gather(1, b_a)
with torch.no_grad():
if double_q:
b_a_ = qnet(b_o_).argmax(1).unsqueeze(1)
b_q_ = (1 - b_d) * qtar(b_o_).gather(1, b_a_)
else:
b_q_ = (1 - b_d) * qtar(b_o_).max(1, keepdim=True)[0]
abs_td_error = (b_q - (b_r + gamma * b_q_)).abs()
if extra:
loss = (extra[0] * huber_loss(abs_td_error)).mean() # weighted
else:
loss = huber_loss(abs_td_error).mean()
optimizer.zero_grad()
loss.backward()
if grad_norm is not None:
nn.utils.clip_grad_norm_(qnet.parameters(), grad_norm)
optimizer.step()
if prioritized_replay:
priorities = abs_td_error.detach().cpu().clamp(1e-6).numpy()
buffer.update_priorities(extra[1], priorities)
# update target net and log
if n_iter % target_network_update_freq == 0:
qtar.load_state_dict(qnet.state_dict())
logger.info('{} Iter {} {}'.format('=' * 10, n_iter, '=' * 10))
fps = int(n_iter / (time.time() - start_ts))
logger.info('Total timesteps {} FPS {}'.format(n_iter, fps))
for k, v in infos.items():
v = (sum(v) / len(v)) if v else float('nan')
logger.info('{}: {:.6f}'.format(k, v))
if n_iter > learning_starts and n_iter % train_freq == 0:
logger.info('vloss: {:.6f}'.format(loss.item()))
if save_interval and n_iter % save_interval == 0:
torch.save([qnet.state_dict(), optimizer.state_dict()],
os.path.join(save_path, '{}.{}'.format(name, n_iter)))
