def __init__(self, state_shape, action_shape, params):
self.state_shape = state_shape
self.action_shape = action_shape
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['lr']
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
if len(self.state_shape) == 1:
self.DQN = SLP
elif len(self.state_shape) == 3:
self.DQN = CNN
self.Q = self.DQN(state_shape, action_shape, device).to(device)
self.Q.apply(utils.weights_initializer.xavier)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(state_shape, action_shape,
device).to(device)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = params["epsilon_max"]
self.epsilon_min = params["epsilon_min"]
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(
capacity=int(self.params['experience_memory_capacity']))
def __init__(
self,
environment,
learning_rate=0.005,
gamma=0.98
): # metodo de inicializacion y self es una referencia del propio objecto
self.obs_shape = environment.observation_space.shape # me quedo los valores (tamaño, mas alto y mas bajo)
self.action_shape = environment.action_space.n # numero de acciones
self.Q = SLP(self.obs_shape, self.action_shape)
self.Q_optimizer = torch.optim.Adam(
self.Q.parameters(), lr=learning_rate) # lr = radio de aprendisaje
self.gamma = gamma
self.epsilon_max = 1.0
self.epsilon_min = 0.05
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=0.5 * MAX_NUM_EPISODES * STEPS_PER_EPISODE)
self.step_num = 0
self.policy = self.epsilon_greedy_Q # politica de actuacion
self.memory = ExperienceMemory(capacity=int(1e6))
self.device = torch.device(
"cuda" if torch.cuda.is_available() else "cpu")
def __init__(self, obs_shape, action_shape, hidden_shape, params):
self.params = params
self.gamma = self.params["gamma"]
self.delta = self.params["delta"]
self.learning_rate = self.params["learning_rate"]
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
self.action_shape = action_shape
self.Q = CNN(obs_shape, action_shape, hidden_shape)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = self.params["epsilon_max"]
self.epsilon_min = self.params["epsilon_min"]
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params["epsilon_decay_final_step"])
self.memory = ExperienceMemory(self.params["memory"])
self.total_trainings = 0
self.step_num = 0
def __init__(self, obs_shape, action_shape, params): # metodo de inicializacion y self es una referencia del propio objecto
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['learning_rate']
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
#self.MAX_NUM_EPISODES = self.params['max_num_episodes']
#self.STEPS_PER_EPISODE = self.params['steps_per_episode']
self.action_shape = action_shape
if len(obs_shape) == 1: ## Solo tenemos una dimensión del espacio de observaciones
self.DQN = SLP
elif len(obs_shape) == 3: ## El estado de observaciones es una imagen/3D
self.DQN = CNN
self.Q = self.DQN(obs_shape, action_shape, device).to(device)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(), lr = self.learning_rate) # lr = radio de aprendisaje
if self.params['use_target_network']:
self.Q_target = self.DQN(obs_shape, action_shape, device).to(device)
self.policy = self.epsilon_greedy_Q # politica de actuacion
self.epsilon_max = self.params['epsilon_max']
self.epsilon_min = self.params['epsilon_min']
self.epsilon_decay = LinearDecaySchedule(initial_value = self.epsilon_max,
final_value = self.epsilon_min,
max_steps = self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(capacity = int(self.params['experience_memory_size']))
def __init__(self, state_shape, action_shape, params):
"""
self.Q is the Action-Value function. This agent represents Q using a Neural Network
If the input is a single dimensional vector, uses a Single-Layer-Perceptron else if the input is 3 dimensional
image, use a Convolutional-Neural-Network
:param state_shape: Shape (tuple) of the observation/state
:param action_shape: Shape (number) of the discrete action space
:param params: A dictionary containing various Agent configuration parameters and hyper-parameters
"""
self.state_shape = state_shape
self.action_shape = action_shape
self.params = params
self.gamma = self.params['gamma'] # Agent's discount factor
self.learning_rate = self.params['lr'] # Agent's Q-learning rate
self.best_mean_reward = -float(
"inf") # Agent's personal best mean episode reward
self.best_reward = -float("inf")
self.training_steps_completed = 0 # Number of training batch steps completed so far
if len(self.state_shape
) == 1: # Single dimensional observation/state space
self.DQN = SLP
elif len(self.state_shape) == 3: # 3D/image observation/state
self.DQN = CNN
self.Q = self.DQN(state_shape, action_shape, device).to(device)
self.Q.apply(utils.weights_initializer.xavier)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(state_shape, action_shape,
device).to(device)
# self.policy is the policy followed by the agent. This agents follows
# an epsilon-greedy policy w.r.t it's Q estimate.
self.policy = self.epsilon_greedy_Q
self.epsilon_max = params["epsilon_max"]
self.epsilon_min = params["epsilon_min"]
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(
capacity=int(self.params['experience_memory_capacity']
)) # Initialize an Experience memory with 1M capacity
def __init__(self, environment, learning_rate=0.005, gamma=0.98):
self.obs_shape = environment.observation_space.shape
self.action_shape = environment.action_space.n
self.device = torch.device(
"cuda" if torch.cuda.is_available() else "cpu")
self.Q = SLP(self.obs_shape, self.action_shape, self.device)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=learning_rate)
self.gamma = gamma
self.epsilon_max = 1.0
self.epsilon_min = 0.05
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=0.5 * MAX_NUM_EPISODES * MAX_STEP_PER_EPISODE)
self.step_num = 0
self.policy = self.epsilon_greedy_Q
self.memory = ExperienceMemory(capacity=int(1e5))
def __init__(self, state_shape, action_shape, params, writer, device="cpu"):
"""
self.Q is the Action-value function.This agent represents Q using a Neural Network
If the input is a single dimensional vector, use a Single Layer Perceptron else if the input is 3 dimensional image, use a Convolutional Neural Network
:param state_shape: Shape (tuple) of the observation/state
:param action_shape: Shape (number) of the discrete action space
:param params: A dictionary containing various Agent configuration parameters and hyper-parameters
"""
self.state_shape = state_shape
self.action_shape = action_shape
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['lr']
self.best_mean_reward = -float('inf')
self.best_reward = -float('inf')
self.training_steps_completed = 0
self.writer = writer
self.device = device
if len(self.state_shape) == 1:
self.DQN = SLP
elif len(self.state_shape) == 3:
self.DQN = CNN
self.Q = self.DQN(state_shape, action_shape,
self.device).to(self.device)
self.Q.apply(utils.weights_initializer.xavier)
self.Q_optimizer = torch.optim.Adam(
self.Q.parameters(), lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(
state_shape, action_shape, self.device).to(self.device)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = params['epsilon_max']
self.epsilon_min = params['epsilon_min']
self.epsilon_decay = LinearDecayScheduler(
initial_value=self.epsilon_max, final_value=self.epsilon_min, max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(capacity=int(
self.params['experience_memory_capacity']))
def __init__(self, obs_shape, action_shape, params):
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['learning_rate']
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
self.action_shape = action_shape
if len(
obs_shape
) == 1: ## Solo tenemos una dimensión del espacio de observaciones
self.DQN = SLP
elif len(obs_shape
) == 3: ## El estado de observaciones es una imagen/3D
self.DQN = CNN
self.Q = self.DQN(obs_shape, action_shape, device).to(device)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(obs_shape, action_shape,
device).to(device)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = self.params['epsilon_max']
self.epsilon_min = self.params['epsilon_min']
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(
capacity=int(self.params['experience_memory_size']))
class DeepQLearner(object):
def __init__(self, obs_shape, action_shape, params): # metodo de inicializacion y self es una referencia del propio objecto
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['learning_rate']
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
#self.MAX_NUM_EPISODES = self.params['max_num_episodes']
#self.STEPS_PER_EPISODE = self.params['steps_per_episode']
self.action_shape = action_shape
if len(obs_shape) == 1: ## Solo tenemos una dimensión del espacio de observaciones
self.DQN = SLP
elif len(obs_shape) == 3: ## El estado de observaciones es una imagen/3D
self.DQN = CNN
self.Q = self.DQN(obs_shape, action_shape, device).to(device)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(), lr = self.learning_rate) # lr = radio de aprendisaje
if self.params['use_target_network']:
self.Q_target = self.DQN(obs_shape, action_shape, device).to(device)
self.policy = self.epsilon_greedy_Q # politica de actuacion
self.epsilon_max = self.params['epsilon_max']
self.epsilon_min = self.params['epsilon_min']
self.epsilon_decay = LinearDecaySchedule(initial_value = self.epsilon_max,
final_value = self.epsilon_min,
max_steps = self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(capacity = int(self.params['experience_memory_size']))
def get_action(self, obs):
obs = np.array(obs)
obs = obs / 255.0 # esto hara que los valores esten entre 0 y 1
if len(obs.shape) == 3: # tenemos una imagen
if obs.shape[2] < obs.shape[0]: # WxHxC -> esto nos cambiara al siguiente order de la imagens Color x Altura x ancho
obs = obs.reshape(obs.shape[2], obs.shape[1], obs.shape[0]) # reordenamos el tamaño
obs = np.expand_dims(obs, 0) # en vez de tener el array tendremos un bash expandido
return self.policy(obs)
def epsilon_greedy_Q(self, obs):
writer.add_scalar("DQL/epsilon", self.epsilon_decay(self.step_num), self.step_num)
self.step_num +=1
if random.random() < self.epsilon_decay(self.step_num) and not self.params["test"]:
action = random.choice([a for a in range(self.action_shape)])
else:
action = np.argmax(self.Q(obs).data.to(torch.device('cpu')).numpy())
return action
def learn(self, obs, action, reward, next_obs, done):
if done:
td_target = reward + 0.0
else:
td_target = reward + self.gamma * torch.max(self.Q(next_obs)) # con torcho maximiza la toma de decion
td_error = torch.nn.functional.mse_loss(self.Q(obs)[action], td_target) # Funcio de perdida de valores
# RADIO DE APRENDIZAJE:
self.Q_optimizer.zero_grad()
td_error.backward() # Haciendo el paso hacia atras
writer.add_scalar("DQL/td_error", td_error.mean(), self.step_num)
self.Q_optimizer.step() # obtimiza los pesos internos
def replay_experience(self, batch_size = None):
"""
Vuelve a jugar usando la experiencia aleatoria almacenada
:param batch_size: Tamaño de la muestra a tomar de la memoria
:return:
"""
batch_size = batch_size if batch_size is not None else self.params['replay_batch_size']
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
self.training_steps_completed += 1 # contador de entrenamientos
def learn_from_batch_experience(self, experiences):
"""
Actualiza la red neuronal profunda en base a lo aprendido en el conjunto de experiencias anteriores
:param experiences: fragmento de recuerdos anteriores
:return:
"""
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs)/255.0
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
if self.params["clip_reward"]:
reward_batch = np.sign(reward_batch)
next_obs_batch = np.array(batch_xp.next_obs)/255.0
done_batch = np.array(batch_xp.done)
if self.params['use_target_network']: # se aharan 2000 interaciones y parara para descanzar y el 'td_target' actualizara el estado del dicionario y guardar lo aprendido
if self.step_num % self.params['target_network_update_frequency'] == 0:
self.Q_target.load_state_dict(self.Q.state_dict())
td_target = reward_batch + ~done_batch *\
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q_target(next_obs_batch).max(1)[0].data.numpy()
else:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(1)[0].data.numpy()# ~done_batch : Solo hara la suma si no a terminado
td_target = torch.from_numpy(td_target) # convertimos a un tensor para operar
#td_target = td_target.to(self.device)
action_idx = torch.from_numpy(action_batch).to(device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1,action_idx.view(-1,1).long()),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
self.Q_optimizer.step()# hago un paso adelante para que la neurona aprenda
def save(self, env_name):
file_name = self.params['save_dir']+"DQL_"+env_name+".ptm"
agent_state = {"Q": self.Q.state_dict(),
"best_mean_reward": self.best_mean_reward,
"best_reward": self.best_reward}
torch.save(agent_state, file_name)
print("Estado del agente guardado en : ", file_name)
def load(self, env_name):
file_name = self.params['load_dir']+"DQL_"+env_name+".ptm"
agent_state = torch.load(file_name, map_location = lambda storage, loc: storage)
self.Q.load_state_dict(agent_state["Q"])
self.Q.to(device)
self.best_mean_reward = agent_state["best_mean_reward"]
self.best_reward = agent_state["best_reward"]
print("Cargado del modelo Q desde ", file_name,
"que hasta el momento tiene una mejor recompensa media de: ",self.best_mean_reward,
" y una recompensa máxima de: ", self.best_reward)
class DeepQLearner(object):
def __init__(self, obs_shape, action_shape, params):
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['learning_rate']
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
self.action_shape = action_shape
if len(
obs_shape
) == 1: ## Solo tenemos una dimensión del espacio de observaciones
self.DQN = SLP
elif len(obs_shape
) == 3: ## El estado de observaciones es una imagen/3D
self.DQN = CNN
self.Q = self.DQN(obs_shape, action_shape, device).to(device)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(obs_shape, action_shape,
device).to(device)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = self.params['epsilon_max']
self.epsilon_min = self.params['epsilon_min']
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(
capacity=int(self.params['experience_memory_size']))
def get_action(self, obs):
obs = np.array(obs)
obs = obs / 255.0
if len(obs.shape) == 3: # tenemos una imagen
if obs.shape[2] < obs.shape[0]: # WxHxC -> C x H x W
obs = obs.reshape(obs.shape[2], obs.shape[1], obs.shape[0])
obs = np.expand_dims(obs, 0)
return self.policy(obs)
def epsilon_greedy_Q(self, obs):
writer.add_scalar("DQL/epsilon", self.epsilon_decay(self.step_num),
self.step_num)
self.step_num += 1
if random.random() < self.epsilon_decay(
self.step_num) and not self.params["test"]:
action = random.choice([a for a in range(self.action_shape)])
else:
action = np.argmax(
self.Q(obs).data.to(torch.device('cpu')).numpy())
return action
def learn(self, obs, action, reward, next_obs, done):
if done:
td_target = reward + 0.0
else:
td_target = reward + self.gamma * torch.max(self.Q(next_obs))
td_error = torch.nn.functional.mse_loss(self.Q(obs)[action], td_target)
self.Q_optimizer.zero_grad()
td_error.backward()
writer.add_scalar("DQL/td_error", td_error.mean(), self.step_num)
self.Q_optimizer.step()
def replay_experience(self, batch_size=None):
batch_size = batch_size if batch_size is not None else self.params[
'replay_batch_size']
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
self.training_steps_completed += 1
def learn_from_batch_experience(self, experiences):
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs) / 255.0
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
if self.params["clip_reward"]:
reward_batch = np.sign(reward_batch)
next_obs_batch = np.array(batch_xp.next_obs) / 255.0
done_batch = np.array(batch_xp.done)
if torch.cuda.is_available():
if self.params['use_target_network']:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
torch.max(self.Q_target(next_obs_batch).detach(),1)[0].data.tolist()
else:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
torch.max(self.Q(next_obs_batch).detach(),1)[0].data.tolist()
else:
if self.params['use_target_network']:
if self.step_num % self.params[
'target_network_update_frequency'] == 0:
self.Q_target.load_state_dict(self.Q.state_dict())
td_target = reward_batch + ~done_batch *\
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q_target(next_obs_batch).max(1)[0].data
else:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(1)[0].data
td_target = torch.from_numpy(td_target)
td_target = td_target.to(device)
action_idx = torch.from_numpy(action_batch).to(device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1,
action_idx.view(-1, 1).long()),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
self.Q_optimizer.step()
def save(self, env_name):
file_name = self.params['save_dir'] + "DQL_" + env_name + ".ptm"
agent_state = {
"Q": self.Q.state_dict(),
"best_mean_reward": self.best_mean_reward,
"best_reward": self.best_reward
}
torch.save(agent_state, file_name)
print("Estado del agente guardado en : ", file_name)
def load(self, env_name):
file_name = self.params['load_dir'] + "DQL_" + env_name + ".ptm"
agent_state = torch.load(file_name,
map_location=lambda storage, loc: storage)
self.Q.load_state_dict(agent_state["Q"])
self.Q.to(device)
self.best_mean_reward = agent_state["best_mean_reward"]
self.best_reward = agent_state["best_reward"]
print("Cargado del modelo Q desde", file_name,
"que hasta el momento tiene una mejor recompensa media de: ",
self.best_mean_reward, " y una recompensa máxima de: ",
self.best_reward)
class SwallowQLearner(object):
def __init__(self, environment, learning_rate=0.005, gamma=0.98):
self.obs_shape = environment.observation_space.shape
self.action_shape = environment.action_space.n
self.device = torch.device(
"cuda" if torch.cuda.is_available() else "cpu")
self.Q = SLP(self.obs_shape, self.action_shape, self.device)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=learning_rate)
self.gamma = gamma
self.epsilon_max = 1.0
self.epsilon_min = 0.05
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=0.5 * MAX_NUM_EPISODES * MAX_STEP_PER_EPISODE)
self.step_num = 0
self.policy = self.epsilon_greedy_Q
self.memory = ExperienceMemory(capacity=int(1e5))
def get_action(self, obs):
return self.policy(obs)
def epsilon_greedy_Q(self, obs):
if random.random() < self.epsilon_decay(self.step_num):
action = random.choice([a for a in range(self.action_shape)])
else:
action = np.argmax(self.Q(obs).data.to(self.device).cpu().numpy())
return action
def learn(self, obs, action, reward, next_obs):
td_target = reward + self.gamma * torch.max(self.Q(next_obs))
td_error = torch.nn.functional.mse_loss(self.Q(obs)[action], td_target)
self.Q_optimizer.zero_grad()
td_error.backward()
self.Q_optimizer.step()
def replay_experience(self, batch_size):
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experiece(experience_batch)
def learn_from_batch_experiece(self, experiences):
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs)
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
next_obs_batch = np.array(batch_xp.next_obs)
done_batch = np.array(batch_xp.done)
if str(self.device) == "cuda":
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
torch.max(self.Q(next_obs_batch).detach(),1)[0].data.tolist()
else:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(1)[0].data.numpy()
td_target = torch.from_numpy(td_target)
td_target = td_target.to(self.device)
action_idx = torch.from_numpy(action_batch).to(self.device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1,
action_idx.view(-1, 1).long()),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
self.Q_optimizer.step()
class Deep_Q_Learner(object):
def __init__(self, state_shape, action_shape, params):
"""
self.Q is the Action-Value function. This agent represents Q using a Neural Network
If the input is a single dimensional vector, uses a Single-Layer-Perceptron else if the input is 3 dimensional
image, use a Convolutional-Neural-Network
:param state_shape: Shape (tuple) of the observation/state
:param action_shape: Shape (number) of the discrete action space
:param params: A dictionary containing various Agent configuration parameters and hyper-parameters
"""
self.state_shape = state_shape
self.action_shape = action_shape
self.params = params
self.gamma = self.params['gamma'] # Agent's discount factor
self.learning_rate = self.params['lr'] # Agent's Q-learning rate
self.best_mean_reward = -float(
"inf") # Agent's personal best mean episode reward
self.best_reward = -float("inf")
self.training_steps_completed = 0 # Number of training batch steps completed so far
if len(self.state_shape
) == 1: # Single dimensional observation/state space
self.DQN = SLP
elif len(self.state_shape) == 3: # 3D/image observation/state
self.DQN = CNN
self.Q = self.DQN(state_shape, action_shape, device).to(device)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(state_shape, action_shape,
device).to(device)
# self.policy is the policy followed by the agent. This agents follows
# an epsilon-greedy policy w.r.t it's Q estimate.
self.policy = self.epsilon_greedy_Q
self.epsilon_max = 1.0
self.epsilon_min = 0.05
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(
capacity=int(self.params['experience_memory_capacity']
)) # Initialize an Experience memory with 1M capacity
def get_action(self, observation):
if len(observation.shape) == 3: # Single image (not a batch)
if observation.shape[2] < observation.shape[
0]: # Probably observation is in W x H x C format
# Reshape to C x H x W format as per PyTorch's convention
observation = observation.reshape(observation.shape[2],
observation.shape[1],
observation.shape[0])
observation = np.expand_dims(observation,
0) # Create a batch dimension
return self.policy(observation)
def epsilon_greedy_Q(self, observation):
# Decay Epsilon/exploration as per schedule
writer.add_scalar("DQL/epsilon", self.epsilon_decay(self.step_num),
self.step_num)
self.step_num += 1
if random.random() < self.epsilon_decay(self.step_num):
action = random.choice([i for i in range(self.action_shape)])
else:
action = np.argmax(
self.Q(observation).data.to(torch.device('cpu')).numpy())
return action
def learn(self, s, a, r, s_next, done):
# TD(0) Q-learning
if done: # End of episode
td_target = reward + 0.0 # Set the value of terminal state to zero
else:
td_target = r + self.gamma * torch.max(self.Q(s_next))
td_error = td_target - self.Q(s)[a]
# Update Q estimate
#self.Q(s)[a] = self.Q(s)[a] + self.learning_rate * td_error
self.Q_optimizer.zero_grad()
td_error.backward()
self.Q_optimizer.step()
def learn_from_batch_experience(self, experiences):
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(
batch_xp.obs
) / 255.0 # Scale/Divide by max limit of obs's dtype. 255 for uint8
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
next_obs_batch = np.array(
batch_xp.next_obs
) / 255.0 # Scale/Divide by max limit of obs' dtype. 255 for uint8
done_batch = np.array(batch_xp.done)
if self.params['use_target_network']:
if self.training_steps_completed % self.params[
'target_network_update_freq'] == 0:
# The *update_freq is the Num steps after which target net is updated.
# A schedule can be used instead to vary the update freq.
self.Q_target.load_state_dict(self.Q.state_dict())
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q_target(next_obs_batch).max(1)[0].data
else:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(1)[0].data
td_target = td_target.to(device)
action_idx = torch.from_numpy(action_batch).to(device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1, action_idx.view(-1, 1)),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
writer.add_scalar("DQL/td_error", td_error.mean(), self.step_num)
self.Q_optimizer.step()
def replay_experience(self, batch_size=None):
batch_size = batch_size if batch_size is not None else self.params[
'replay_batch_size']
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
self.training_steps_completed += 1 # Increment the number of training batch steps complemented
def save(self, env_name):
file_name = self.params['save_dir'] + "DQL_" + env_name + ".ptm"
agent_state = {
"Q": self.Q.state_dict(),
"best_mean_reward": self.best_mean_reward,
"best_reward": self.best_reward
}
torch.save(agent_state, file_name)
print("Agent's state saved to ", file_name)
def load(self, env_name):
file_name = self.params['load_dir'] + "DQL_" + env_name + ".ptm"
agent_state = torch.load(file_name,
map_location=lambda storage, loc: storage)
self.Q.load_state_dict(agent_state["Q"])
self.Q.to(device)
self.best_mean_reward = agent_state["best_mean_reward"]
self.best_reward = agent_state["best_reward"]
print("Loaded Q model state from", file_name,
" which fetched a best mean reward of:", self.best_mean_reward,
" and an all time best reward of:", self.best_reward)
class DeepQLearner:
def __init__(self, state_shape, action_shape, params, writer, device="cpu"):
"""
self.Q is the Action-value function.This agent represents Q using a Neural Network
If the input is a single dimensional vector, use a Single Layer Perceptron else if the input is 3 dimensional image, use a Convolutional Neural Network
:param state_shape: Shape (tuple) of the observation/state
:param action_shape: Shape (number) of the discrete action space
:param params: A dictionary containing various Agent configuration parameters and hyper-parameters
"""
self.state_shape = state_shape
self.action_shape = action_shape
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['lr']
self.best_mean_reward = -float('inf')
self.best_reward = -float('inf')
self.training_steps_completed = 0
self.writer = writer
self.device = device
if len(self.state_shape) == 1:
self.DQN = SLP
elif len(self.state_shape) == 3:
self.DQN = CNN
self.Q = self.DQN(state_shape, action_shape,
self.device).to(self.device)
self.Q.apply(utils.weights_initializer.xavier)
self.Q_optimizer = torch.optim.Adam(
self.Q.parameters(), lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(
state_shape, action_shape, self.device).to(self.device)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = params['epsilon_max']
self.epsilon_min = params['epsilon_min']
self.epsilon_decay = LinearDecayScheduler(
initial_value=self.epsilon_max, final_value=self.epsilon_min, max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(capacity=int(
self.params['experience_memory_capacity']))
def get_action(self, obs):
obs = np.array(obs)
obs = obs/255.0
if len(obs.shape) == 3:
if obs.shape[2] < obs.shape[0]:
obs = obs.reshape(obs.shape[2], obs.shape[1], obs.shape[0])
obs = np.expand_dims(obs, 0)
return self.policy(obs)
def epsilon_greedy_Q(self, obs):
self.writer.add_scalar(
'DQL/epsilon', self.epsilon_decay(self.step_num), self.step_num)
self.step_num += 1
if random.random() < self.epsilon_decay(self.step_num) and not self.params['test']:
action = random.choice([i for i in range(self.action_shape)])
else:
action = np.argmax(self.Q(obs).data.to(self.device).numpy())
return action
def learn(self, obs, action, reward, next_obs, done):
if done:
td_target = reward + 0.0
else:
td_target = reward + self.gamma * torch.max(self.Q(next_obs))
td_error = td_target - self.Q(s)[a]
self.Q_optimizer.zero_grad()
td_error.backward()
self.Q_optimizer.step()
def learn_from_batch_experience(self, experiences):
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs)
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
if self.params['clip_rewards']: # Clip the rewards
reward_batch = np.sign(reward_batch)
next_obs_batch = np.array(batch_xp.next_obs)/255.0
done_batch = np.array(batch_xp.done)
if self.params['use_target_network']:
if self.step_num % self.params['target_network_update_freq'] == 0:
self.Q_target.load_state_dict(self.Q.state_dict())
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q_target(next_obs_batch).max(
1)[0].data.to(self.device).numpy()
else:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(
1)[0].data.to(self.device).numpy()
td_target = torch.from_numpy(td_target).to(self.device)
action_idx = torch.from_numpy(action_batch).to(self.device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1, action_idx.view(-1, 1)), td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
self.writer.add_scalar('DQL/td_error', td_error.mean(), self.step_num)
self.Q_optimizer.step()
def replay_experience(self, batch_size=None):
batch_size = batch_size if batch_size is not None else self.params['replay_batch_size']
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
self.training_steps_completed += 1
def save(self, env_name):
if not exists(self.params['save_dir']):
makedirs(self.params['save_dir'])
file_name = join(self.params['save_dir'], 'DQL_' + env_name + '.ptm')
agent_state = {'Q': self.Q.state_dict(),
'best_mean_reward': self.best_mean_reward,
'best_reward': self.best_reward
}
torch.save(agent_state, file_name)
print(f"Agent's state saved to {file_name}")
def load(self, env_name):
file_name = self.params['load_dir'] + 'DQL_' + env_name + '.ptm'
agent_state = torch.load(
file_name, map_location=lambda storage, loc: storage)
self.Q.load_state_dict(agent_state['Q'])
self.Q.to(self.device)
self.best_mean_reward = agent_state['best_mean_reward']
self.best_reward = agent_state['best_reward']
print(
f'Loaded Q model state from {file_name} which fetched a best mean reward of {self.best_mean_reward:.3f} and an all time best reward of {self.best_reward}')
class DeepQLearner(object):
def __init__(self, obs_shape, action_shape, hidden_shape, params):
self.params = params
self.gamma = self.params["gamma"]
self.delta = self.params["delta"]
self.learning_rate = self.params["learning_rate"]
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
self.action_shape = action_shape
self.Q = CNN(obs_shape, action_shape, hidden_shape)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = self.params["epsilon_max"]
self.epsilon_min = self.params["epsilon_min"]
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params["epsilon_decay_final_step"])
self.memory = ExperienceMemory(self.params["memory"])
self.total_trainings = 0
self.step_num = 0
def get_action(self, obs):
return self.policy(obs)
def epsilon_greedy_Q(self, obs):
self.step_num += 1
if random.random() < self.epsilon_decay(
self.step_num) and not self.params["test"]:
action = random.choice([a for a in range(self.action_shape)])
else:
action = np.argmax(self.Q(obs).detach().numpy())
return action
def learn(self, obs, action, reward, next_obs, done):
if done:
td_target = reward + torch.tensor(0.0, requires_grad=True)
else:
td_target = reward + self.gamma * torch.max(self.Q(next_obs))
td_error = torch.nn.functional.mse_loss(
self.Q(obs)[0][action], td_target)
#print(td_target.item(), self.Q(obs)[action].item(), td_error.item())
#print(reward, td_target.item(), td_error.item())
self.Q_optimizer.zero_grad()
td_error.backward()
self.Q_optimizer.step()
def replay_experience(self, batch_size=None):
"""
Vuelve a jugar usando la experiencia aleatoria almacenada
:param batch_size: Tamaño de la muestra a tomar de la memoria
:return:
"""
batch_size = batch_size if batch_size is not None else self.params[
"replay_batch_size"]
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
self.training_steps_completed += 1
#print("Replaying {} episodes".format(batch_size))
def learn_from_batch_experience(self, experiences):
"""
Actualiza la red neuronal profunda en base a lo aprendido en el conjunto de experiencias anteriores
:param experiencias: fragmento de recuerdos anteriores
:return:
"""
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs)
obs_batch = obs_batch
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
next_obs_batch = np.array(batch_xp.next_obs)
done_batch = np.array(batch_xp.done)
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(1)[0].data.numpy()
td_target = torch.from_numpy(td_target)
action_idx = torch.from_numpy(action_batch)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1,
action_idx.view(-1, 1).long()),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
self.Q_optimizer.step()
def save(self, env_name):
file_name = self.params["save_dir"] + "DQL_" + env_name + ".ptm"
agent_state = {
"Q": self.Q.state_dict(),
"best_mean_reward": self.best_mean_reward,
"best_reward": self.best_reward,
"total_trainings": self.total_trainings
}
torch.save(agent_state, file_name)
print("NN guardada en: ", file_name)
def load(self, env_name):
file_name = self.params["load_dir"] + "DQL_" + env_name + ".ptm"
agent_state = torch.load(file_name,
map_location=lambda storage, loc: storage)
self.Q.load_state_dict(agent_state["Q"])
#self.Q.eval()
self.best_mean_reward = agent_state["best_mean_reward"]
self.best_reward = agent_state["best_reward"]
self.total_trainings = agent_state["total_trainings"]
print(
"NN cargada desde: {} \nMejor recompensa media: {:.3f}\nMejor recompensa: {:.3f}\nTrains: {}"
.format(file_name, self.best_mean_reward, self.best_reward,
self.total_trainings))
class Deep_Q_Learner(object):
def __init__(self, state_shape, action_shape, params):
self.state_shape = state_shape
self.action_shape = action_shape
self.params = params
self.gamma = self.params['gamma']
self.learning_rate = self.params['lr']
self.best_mean_reward = -float("inf")
self.best_reward = -float("inf")
self.training_steps_completed = 0
if len(self.state_shape) == 1:
self.DQN = SLP
elif len(self.state_shape) == 3:
self.DQN = CNN
self.Q = self.DQN(state_shape, action_shape, device).to(device)
self.Q.apply(utils.weights_initializer.xavier)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=self.learning_rate)
if self.params['use_target_network']:
self.Q_target = self.DQN(state_shape, action_shape,
device).to(device)
self.policy = self.epsilon_greedy_Q
self.epsilon_max = params["epsilon_max"]
self.epsilon_min = params["epsilon_min"]
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=self.params['epsilon_decay_final_step'])
self.step_num = 0
self.memory = ExperienceMemory(
capacity=int(self.params['experience_memory_capacity']))
def get_action(self, observation):
observation = np.array(observation)
observation = observation / 255
if len(observation.shape) == 3:
if observation.shape[2] < observation.shape[0]:
observation.reshape(observation[2], observation[1],
observation[0])
observation = np.expand_dims(observation, 0)
return self.policy(observation)
def epsilon_greedy_Q(self, observation):
writer.add_scalar("DQL/epsilon", self.epsilon_decay(self.step_num),
self.step_num)
self.step_num += 1
if random.random() < self.epsilon_decay(
self.step_num) and not self.params["test"]:
action = random.choice([i for i in range(self.action_shape)])
else:
action = np.argmax(
self.Q(observation).data.to(torch.device('cpu')).numpy())
return action
def learn(self, obs, action, reward, obs_next, done):
if done:
td_target = reward + 0.0
else:
td_target = reward + (self.gamma * torch.max(self.Q(obs_next)))
td_error = td_target - self.Q(obs)[action]
self.Q_optimizer.zero_grad()
td_error.backward()
self.Q_optimizer.step()
def learn_from_batch_experience(self, experiences):
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs) / 255.0
action_batch = np.array(batch_xp.action)
reward_batch = np.array(obs_batch.reward)
if self.params["clip_rewards"]:
reward_batch = np.sign(reward_batch)
next_obs_batch = np.array(batch_xp.next_obs) / 255.0
done_batch = np.array(batch_xp.done)
if self.params['use_target_network']:
if self.step_num % self.params['target_network_update_freq'] == 0:
self.Q_target.load_state_dict(self.Q.state_dict())
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q_target(next_obs_batch).max(1)[0].data.cpu().numpy()
else:
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).max(1)[0].data.cpu().numpy()
td_target = torch.from_numpy(td_target).to(device)
action_idx = torch.from_numpy(action_batch).to(device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1, action_idx.view(-1, 1)),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
writer.add_scalar("DQL/td_error", td_error.mean(), self.step_num)
self.Q_optimizer.step()
def replay_experience(self, batch_size=None):
batch_size = batch_size if batch_size is not None else self.params[
'replay_batch_size']
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
self.training_steps_completed += 1
def save(self, env_name):
file_name = self.params['save_dir'] + "DQL_" + env_name + ".ptm"
agent_state = {
"Q": self.Q.state_dict(),
"best_mean_reward": self.best_mean_reward,
"best_reward": self.best_reward
}
torch.save(agent_state, file_name)
print("Agent's state saved to ", file_name)
def load(self, env_name):
file_name = self.params['load_dir'] + "DQL_" + env_name + ".ptm"
agent_state = torch.load(file_name,
map_location=lambda storage, loc: storage)
self.Q.load_state_dict(agent_state["Q"])
self.Q.to(device)
self.best_mean_reward = agent_state["best_mean_reward"]
self.best_reward = agent_state["best_reward"]
print("Loaded Q model state from", file_name,
" which fetched a best mean reward of:", self.best_mean_reward,
" and an all time best reward of:", self.best_reward)
class SwallowQLearner(object):
def __init__(self, environment, learning_rate=0.005, gamma=0.98):
self.obs_shape = environment.observation_space.shape
self.action_shape = environment.action_space.n
self.Q = SLP(self.obs_shape, self.action_shape)
self.Q_optimizer = torch.optim.Adam(self.Q.parameters(),
lr=learning_rate)
self.gamma = gamma
self.epsilon_max = 1.0
self.epsilon_min = 0.05
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=0.5 * MAX_NUM_EPISODES * STEPS_PER_EPISODE)
self.step_num = 0
self.policy = self.epsilon_greedy_Q
self.memory = ExperienceMemory(capacity=int(1e5))
self.device = torch.device(
"cuda" if torch.cuda.is_available() else "cpu")
def get_action(self, obs):
return self.policy(obs)
def epsilon_greedy_Q(self, obs):
if random.random() < self.epsilon_decay(self.step_num):
action = random.choice([a for a in range(self.action_shape)])
else:
action = np.argmax(
self.Q(obs).data.to(torch.device('cpu')).numpy())
self.step_num += 1 ##EN EL VIDEO SE NOS OLVIDÓ SUBIR EL STEP EN UNA UNIDAD
return action
def learn(self, obs, action, reward, next_obs):
td_target = reward + self.gamma * torch.max(self.Q(next_obs))
td_error = torch.nn.functional.mse_loss(self.Q(obs)[action], td_target)
self.Q_optimizer.zero_grad()
td_error.backward()
self.Q_optimizer.step()
def replay_experience(self, batch_size):
"""
Vuelve a jugar usando la experiencia aleatoria almacenada
:param batch_size: Tamaño de la muestra a tomar de la memoria
:return:
"""
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
def learn_from_batch_experience(self, experiences):
"""
Actualiza la red neuronal profunda en base a lo aprendido en el conjunto de experiencias anteriores
:param experiences: fragmento de recuerdos anteriores
:return:
"""
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs)
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
next_obs_batch = np.array(batch_xp.next_obs)
done_batch = np.array(batch_xp.done)
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(1)[0].data.numpy()
td_target = torch.from_numpy(td_target)
td_target = td_target.to(self.device)
action_idx = torch.from_numpy(action_batch).to(self.device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1,
action_idx.view(-1, 1).long()),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
self.Q_optimizer.step()
class SwallowQLearner(object):
def __init__(
self,
environment,
learning_rate=0.005,
gamma=0.98
): # metodo de inicializacion y self es una referencia del propio objecto
self.obs_shape = environment.observation_space.shape # me quedo los valores (tamaño, mas alto y mas bajo)
self.action_shape = environment.action_space.n # numero de acciones
self.Q = SLP(self.obs_shape, self.action_shape)
self.Q_optimizer = torch.optim.Adam(
self.Q.parameters(), lr=learning_rate) # lr = radio de aprendisaje
self.gamma = gamma
self.epsilon_max = 1.0
self.epsilon_min = 0.05
self.epsilon_decay = LinearDecaySchedule(
initial_value=self.epsilon_max,
final_value=self.epsilon_min,
max_steps=0.5 * MAX_NUM_EPISODES * STEPS_PER_EPISODE)
self.step_num = 0
self.policy = self.epsilon_greedy_Q # politica de actuacion
self.memory = ExperienceMemory(capacity=int(1e6))
self.device = torch.device(
"cuda" if torch.cuda.is_available() else "cpu")
def get_action(self, obs):
return self.policy(obs)
def epsilon_greedy_Q(self, obs):
if random.random() < self.epsilon_decay(
self.step_num): # numero aleatorio
action = random.choice([
a for a in range(self.action_shape)
]) # del total de espcios aleactorios decido una
else:
action = np.argmax(
self.Q(obs).data.to(torch.device('cpu')).numpy())
return action
def learn(self, obs, action, reward, next_obs):
#discrete_obs = self.discretize(obs)
#discrete_next_obs = self.discretize(next_obs)
td_target = reward + self.gamma * torch.max(
self.Q(next_obs)) # con torcho maximiza la toma de decion
td_error = torch.nn.functional.mse_loss(
self.Q(obs)[action], td_target) # Funcio de perdida de valores
# RADIO DE APRENDIZAJE:
self.Q_optimizer.zero_grad()
td_error.backward() # Haciendo el paso hacia atras
self.Q_optimizer.step() # obtimiza los pesos internos
def replay_experience(self, batch_size):
"""
Vuelve a jugar usando la experiencia aleatoria almacenada
:param batch_size: Tamaño de la muestra a tomar de la memoria
:return:
"""
experience_batch = self.memory.sample(batch_size)
self.learn_from_batch_experience(experience_batch)
def learn_from_batch_experience(self, experiences):
"""
Actualiza la red neuronal profunda en base a lo aprendido en el conjunto de experiencias anteriores
:param experiences: fragmento de recuerdos anteriores
:return:
"""
batch_xp = Experience(*zip(*experiences))
obs_batch = np.array(batch_xp.obs)
action_batch = np.array(batch_xp.action)
reward_batch = np.array(batch_xp.reward)
next_obs_batch = np.array(batch_xp.next_obs)
done_batch = np.array(batch_xp.done)
td_target = reward_batch + ~done_batch * \
np.tile(self.gamma, len(next_obs_batch)) * \
self.Q(next_obs_batch).detach().max(1)[0].data.numpy()
# ~done_batch : Solo hara la suma si no a terminado
td_target = torch.from_numpy(
td_target) # convertimos a un tensor para operar
td_target = td_target.to(self.device)
action_idx = torch.from_numpy(action_batch).to(self.device)
td_error = torch.nn.functional.mse_loss(
self.Q(obs_batch).gather(1,
action_idx.view(-1, 1).long()),
td_target.float().unsqueeze(1))
self.Q_optimizer.zero_grad()
td_error.mean().backward()
self.Q_optimizer.step(
) # hago un paso adelante para que la neurona aprenda