def __init__(self, env, mode, pre_trained_model, tensorboard_writer=None):
super(DQNAgent, self).__init__(env, mode, tensorboard_writer)
self.agent_name = 'DQN' + str(self.agent_no)
self.memory = ReplayMemory()
self.network = DeepQNetwork(self.obs_space[0], self.action_space)
if self.mode == 'play':
self.network.load_params(pre_trained_model)
self.network.eval()
elif self.mode == 'train':
self.eval_network = DeepQNetwork(self.obs_space[0],
self.action_space)
self.eval_network.eval()
if pre_trained_model:
self.eval_network.load_params(pre_trained_model)
self.optimizer = optim.RMSprop(self.network.parameters(), lr=LR)
self.loss_func = SmoothL1Loss()
else:
raise ValueError(
'Please set a valid mode for the agent (play or train)')
def __init__(self, sess, s_size, a_size, scope, queues, trainer):
self.queue = queues[0]
self.param_queue = queues[1]
self.replaymemory = ReplayMemory(100000)
self.sess = sess
self.learner_net = network(s_size, a_size, scope, 20)
self.q = self.learner_net.q
self.Q = self.learner_net.Q
self.actions_q = tf.placeholder(shape=[None, a_size, N],
dtype=tf.float32)
self.q_target = tf.placeholder(shape=[None, N], dtype=tf.float32)
self.ISWeights = tf.placeholder(shape=[None, N], dtype=tf.float32)
self.q_actiona = tf.multiply(self.q, self.actions_q)
self.q_action = tf.reduce_sum(self.q_actiona, axis=1)
self.u = tf.abs(self.q_target - self.q_action)
self.loss = tf.reduce_mean(
tf.reduce_sum(tf.square(self.u) * self.ISWeights, axis=1))
self.local_vars = self.learner_net.local_vars #tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, scope)
self.gradients = tf.gradients(self.loss, self.local_vars)
#grads,self.grad_norms = tf.clip_by_norm(self.gradients,40.0)
self.apply_grads = trainer.apply_gradients(
zip(self.gradients, self.local_vars))
self.sess.run(tf.global_variables_initializer())
def __init__(self, policy_net, target_net, durability, optimizer, name,
constants):
"""An agent class that takes action on the environment and optimizes
the action based on the reward.
Parameters
----------
policy_net : DQN
[description]
target_net : DQN
[description]
durability : int
[description]
optimizer : [type]
[description]
name : str
The name of agent
constants: Constants
The hyper-parameters from Constants class
"""
self.CONSTANTS = constants
self.policy_net = policy_net
self.target_net = target_net
self.target_net.load_state_dict(policy_net.state_dict())
self.durability = durability
self.optimizer = optimizer
self.name = name
self.memory = ReplayMemory(self.CONSTANTS.MEMORY_SIZE)
self.steps_done = 0
self.total_reward = 0.0
self.reward = 0.0
self.obtained_reward = 0.0
self.n_best = 0
self.policy_net_flag = False
def __init__(self, state_size, action_size, seed, is_double_q=False):
'''Initialize an Agent.
Params
======
state_size (int): the dimension of the state
action_size (int): the number of actions
seed (int): random seed
'''
self.state_size = state_size
self.action_size = action_size
self.seed = random.seed(seed)
self.t_step = 0 # Initialize time step (for tracking LEARN_EVERY_STEP and UPDATE_EVERY_STEP)
self.running_loss = 0
self.training_cnt = 0
self.is_double_q = is_double_q
self.qnetwork_local = QNetwork(self.state_size, self.action_size,
seed).to(device)
self.qnetowrk_target = QNetwork(self.state_size, self.action_size,
seed).to(device)
self.optimizer = optim.Adam(self.qnetwork_local.parameters(), lr=LR)
self.replay_memory = ReplayMemory(BATCH_SIZE, BUFFER_SIZE, seed)
def __init__(self,
load_checkpoint,
n_states,
n_actions,
checkpoint_file,
mem_size=10**6,
batch_size=64,
n_hid1=400,
n_hid2=300,
alpha=1e-4,
beta=1e-3,
gamma=0.99,
tau=0.99):
self.batch_size = batch_size
self.gamma = gamma
self.tau = tau
self.actor = ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
alpha,
checkpoint_file,
name='actor')
self.critic = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
beta,
checkpoint_file,
name='critic')
self.actor_target = ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
alpha,
checkpoint_file,
name='actor_target')
self.critic_target = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
beta,
checkpoint_file,
name='critic_target')
self.noise = OUActionNoise(mu=np.zeros(n_actions))
self.memory = ReplayMemory(mem_size, n_states, n_actions)
self.update_network_parameters_phil(tau=1)
if load_checkpoint:
self.actor.eval()
self.load_checkpoint = load_checkpoint
def __init__(self, env, name, s_size, a_size, trainer, model_path,
global_episodes):
self.name = "worker_" + str(name)
self.number = name
self.model_path = model_path
self.trainer = trainer
self.global_episodes = global_episodes
self.increment = self.global_episodes.assign_add(1)
self.episode_rewards = []
self.episode_lengths = []
self.episode_mean_values = []
#Create the local copy of the network and the tensorflow op to copy global paramters to local network
self.local_Q = Q_Network(s_size, a_size, self.name, trainer)
self.update_local_ops = update_target_graph('global', self.name)
self.env = env
self.replaymemory = ReplayMemory(max_memory)
def __init__(self, num_states, num_actions, Double, Dueling, PER):
self.num_actions = num_actions # 행동 가짓수(2)를 구함
self.Double = Double
self.Dueling = Dueling
self.PER = PER
# transition을 기억하기 위한 메모리 객체 생성
self.memory = ReplayMemory(CAPACITY)
# 신경망 구성
n_in, n_mid, n_out = num_states, 32, num_actions
self.main_q_network = Net(n_in, n_mid, n_out, Dueling) # Net 클래스를 사용
self.target_q_network = Net(n_in, n_mid, n_out, Dueling) # Net 클래스를 사용
print(self.main_q_network) # 신경망의 구조를 출력
# 최적화 기법을 선택
self.optimizer = optim.Adam(self.main_q_network.parameters(), lr=0.0001)
# PER - TD 오차를 기억하기 위한 메모리 객체 생성
if self.PER == True:
self.td_error_memory = TDerrorMemory(CAPACITY)
def __init__(self, dim):
self.critic_path = cst.CN_CKPT_PATH
self.actor_path = cst.AN_CKPT_PATH
self.replaymemory_path = cst.RM_PATH
self.dim_body = dim[0]
self.dim_sensor = dim[1]
self.dim_state = dim[0] + dim[1] * 3
self.dim_action = dim[2]
self.sess = tf.InteractiveSession()
self.act_lr = cst.ACT_LEARNING_RATE
self.cri_lr = cst.CRI_LEARNING_RATE
self.tau = cst.TAU
self.batch_size = cst.BATCH_SIZE
self.gamma = cst.REWARD_DECAY
self.actorNN = ActorNetwork(self.sess, self.dim_state, self.dim_action,
self.act_lr, self.tau, self.batch_size)
self.criticNN = CriticNetwork(self.sess, self.dim_state,
self.dim_action, self.cri_lr, self.tau,
self.gamma,
self.actorNN.get_num_trainable_vars())
self.sess.run(tf.global_variables_initializer())
self.actorNN.update_target_network()
self.criticNN.update_target_network()
self.rm = ReplayMemory('DDPG')
self.agent_count = cst.AGENT_COUNT
self.exploration_rate = cst.EXPLORATION_RATE
self.epsilon = cst.CRITIC_EPSILON
self.LOSS_ITERATION = cst.LOSS_ITERATION
self.expl_noise = OUNoise(self.dim_action)
self.expl = False
self.expl_decay = cst.EXPLORATION_DECAY
def __init__(self,env,name,s_size,a_size,trainer,model_path,global_episodes):
self.name = "worker_" + str(name)
self.number = name
self.model_path = model_path
self.trainer = trainer
self.global_episodes = global_episodes
self.increment = self.global_episodes.assign_add(1)
self.episode_rewards = []
self.episode_lengths = []
self.episode_mean_values = []
#Create the local copy of the network and the tensorflow op to copy global paramters to local network
self.local_Q = Q_Network(s_size, a_size, self.name, trainer)
self.update_local_ops = update_target_graph('global', self.name)
self.env = env
self.replaymemory = ReplayMemory(max_memory)
def main(game, episodes, training_mode=False, log=False, no_ops=30):
env = gym.make(game)
num_actions = env.action_space.n
dqn = DeepQNetwork(num_actions, (4, 84, 84))
replay = ReplayMemory(100000)
obs = env.reset()
h, w, c = obs.shape
phi = Phi(4, 84, 84, c, h, w)
agent = Agent(replay, dqn, training_mode=training_mode)
stats = Stats('results/results.csv')
for i_episode in range(episodes):
env.reset()
for i in range(random.randint(1, no_ops)):
observation, _, _, _ = env.step(0)
pre_state = phi.add(observation)
game_score = 0
done = False
t = 0
while not done:
t += 1
env.render()
action = agent.get_action(pre_state)
observation, reward, done, _ = env.step(action)
post_state = phi.add(observation)
if training_mode:
agent.update_replay_memory(pre_state, action, reward,
post_state, done)
if agent.time_step > agent.replay_start_size:
stats.log_time_step(agent.get_loss())
pre_state = post_state
game_score += reward
print("Episode {} finished after {} time steps with score {}".format(
i_episode, t, game_score))
phi.reset()
if agent.time_step > agent.replay_start_size:
stats.log_game(game_score, t)
stats.close()
if log:
dqn.save_model('results/model_weights.hdf5')
def main():
game = FlappyBird()
env = PLE(game, fps=30, display_screen=False)
env_evaluate = PLE(game, fps=30, display_screen=False)
obs_dim = len(env.getGameState())
action_dim = 2 # 只能是up键，还有一个其它，所以是2
# rpm = ReplayMemory(MEMORY_SIZE, obs_dim, action_dim)
rpm = ReplayMemory(MEMORY_SIZE)
model = Model(act_dim=action_dim)
algorithm = parl.algorithms.DQN(model,
act_dim=action_dim,
gamma=GAMMA,
lr=LEARNING_RATE)
agent = Agent(
algorithm,
obs_dim=obs_dim,
act_dim=action_dim,
e_greed=0.2, # explore
e_greed_decrement=1e-6
) # probability of exploring is decreasing during training
if os.path.exists('./model_dir'):
agent.restore('./model_dir')
# while rpm.size() < MEMORY_WARMUP_SIZE: # warm up replay memory
while len(rpm) < MEMORY_WARMUP_SIZE: # warm up replay memory
run_episode(agent, env, rpm)
max_episode = 5000
# start train
episode = 0
while episode < max_episode:
# train part
for i in range(0, 50):
total_reward = run_episode(agent, env, rpm)
episode += 1
eval_reward = evaluate(agent, env_evaluate)
logger.info('episode:{} test_reward:{}'.format(
episode, eval_reward))
agent.save('./model_dir')
EPISODES = 500
START_RANDOM = False
MAX_EPISODE_COUNTER = 3600 * 24 * 2.0 / PERIOD
ACTION_DIM = 1
STATE_DIM = 6
ACTION_MAX = 1.0
MAX_BUFFER = 100000
MAX_TOTAL_REWARD = 300
EPISODE_PLOT = 25
# -------------------------------------------- #
# LOAD USEFULL CLASSES.
# -------------------------------------------- #
# Load the memroy
memory = ReplayMemory(MAX_BUFFER)
# Load the environment.
env = Environment(FILENAME, QUOTE_QTY, TRADE_QTY)
# Load the trainer.
trainer = Trainer(STATE_DIM, ACTION_DIM, ACTION_MAX, memory)
# Load the window.
window = Window(LOOK_BACK)
window.add_norm("#t", method="log_change", ref="close_price_#t")
# Load the tensorboard writer.
writer = SummaryWriter("tensorboard/runs")
# -------------------------------------------- #
def __init__(
self,
game,
mem_size=512 * 512, #1024*512,
state_buffer_size=4,
batch_size=64,
learning_rate=1e-5,
pretrained_model=None,
frameskip=4, #1
record=False):
"""
Inputs:
- game: string to select the game
- mem_size: int length of the replay memory
- state_buffer_size: int number of recent frames used as input for neural network
- batch_size: int
- learning_rate: float
- pretrained_model: str path to the model
- record: boolean to enable record option
"""
# Namestring
self.game = game
# dimensions: tuple (h1,h2,w1,w2) with dimensions of the game (to crop borders)
#if self.game == 'Breakout-v0':
# dimensions = (32, 195, 8, 152)
#elif self.game == 'SpaceInvaders-v0':
# dimensions = (21, 195, 20, 141)
#elif self.game == 'Assault-v0':
# dimensions = (50, 240, 5, 155)
#elif self.game == 'Phoenix-v0':
# dimensions = (23, 183, 0, 160)
#elif self.game == 'Skiing-v0':
# dimensions = (55, 202, 8, 152)
#elif self.game == 'Enduro-v0':
# dimensions = (50, 154, 8, 160)
#elif self.game == 'BeamRider-v0':
# dimensions = (32, 180, 9, 159)
if self.game == 'BreakoutAndSpace':
dimensions_break = (32, 195, 8, 152)
dimensions_space = (21, 195, 20, 141)
elif self.game != 'BreakoutAndSpace':
print(
'Error! This version is for playing BreakOut and SpaceInvaders at the same time.'
)
# Environment
self.env_break = Environment('BreakoutNoFrameskip-v4',
dimensions_break,
frameskip=frameskip)
self.env_space = Environment('SpaceInvaders-v0',
dimensions_space,
frameskip=frameskip)
# Cuda
self.use_cuda = torch.cuda.is_available()
# Neural network
self.net = DQN(channels_in=state_buffer_size,
num_actions=self.env_space.get_number_of_actions())
self.target_net = DQN(
channels_in=state_buffer_size,
num_actions=self.env_space.get_number_of_actions())
if self.use_cuda:
self.net.cuda()
self.target_net.cuda()
if pretrained_model:
self.net.load(pretrained_model)
self.target_net.load(pretrained_model)
self.pretrained_model = True
else:
self.pretrained_model = False
# Optimizer
self.learning_rate = learning_rate
self.optimizer = optim.Adam(self.net.parameters(), lr=learning_rate)
#self.optimizer = optim.RMSprop(self.net.parameters(), lr = 0.00025,alpha=0.95, eps=0.01)
self.batch_size = batch_size
self.optimize_each_k = 4
self.update_target_net_each_k_steps = 10000
self.noops_count = 0
# Replay Memory (Long term memory)
self.replay = ReplayMemory(capacity=mem_size,
num_history_frames=state_buffer_size)
self.mem_size = mem_size
# Fill replay memory before training
if not self.pretrained_model:
self.start_train_after = 25000
else:
self.start_train_after = mem_size // 2
# Buffer for the most recent states (Short term memory)
self.num_stored_frames = state_buffer_size
# Steps
self.steps = 0
# Save net
self.save_net_each_k_episodes = 500
def __init__(self,
load_checkpoint,
checkpoint_file,
env,
n_states,
n_actions,
update_actor_interval=2,
warmup=1000,
mem_size=10**6,
batch_size=100,
n_hid1=400,
n_hid2=300,
lr_alpha=1e-3,
lr_beta=1e-3,
gamma=0.99,
tau=5e-3,
noise_mean=0,
noise_sigma=0.1):
self.load_checkpoint = load_checkpoint
self.checkpoint_file = checkpoint_file
# needed for clamping in the learn function
self.env = env
self.max_action = float(env.action_space.high[0])
self.low_action = float(env.action_space.low[0])
self.n_actions = n_actions
# to keep track of how often we call "learn" function, for the actor network
self.learn_step_counter = 0
# to handle countdown to the end of the warmup period, incremented every time we call an action
self.time_step = 0
self.update_actor_interval = update_actor_interval
self.warmup = warmup
self.gamma = gamma
self.tau = tau
self.batch_size = batch_size
self.noise_mean = noise_mean
self.noise_sigma = noise_sigma
self.actor = TD3ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_alpha,
checkpoint_file,
name='actor')
self.target_actor = TD3ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_alpha,
checkpoint_file,
name='target_actor')
self.critic_1 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='critic_1')
self.critic_2 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='critic_2')
self.target_critic_1 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='target_critic_1')
self.target_critic_2 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='target_critic_2')
self.memory = ReplayMemory(mem_size, n_states, n_actions)
# tau=1 perform an exact copy of the networks to the respective targets
# self.update_network_parameters(tau=1)
self.update_network_parameters(self.actor, self.target_actor, tau=1)
self.update_network_parameters(self.critic_1,
self.target_critic_1,
tau=1)
self.update_network_parameters(self.critic_2,
self.target_critic_2,
tau=1)
image_dimensions = 210 * 160 * 3
num_episodes = 50
target_episode_update = 5
action_threshold = 250
train_batch_size = 64
GAMMA = 0.999
EPS_START = 0.9
EPS_END = 0.05
EPS_DECAY = 200
steps_done = 0
n_actions = env.action_space.n
screen_height = 210
screen_width = 160
memory = ReplayMemory(10000)
policy_net = DQN(screen_height, screen_width, n_actions).to(device)
target_net = DQN(screen_height, screen_width, n_actions).to(device)
target_net.eval()
optimizer = optim.RMSprop(policy_net.parameters())
def optimize_model():
if len(memory) < train_batch_size:
return
transitions = memory.sample(train_batch_size)
print('Training on:', len(transitions))
class SingleAgent(object):
def __init__(self,
game,
mem_size = 1000000,
state_buffer_size = 4,
batch_size = 64,
learning_rate = 1e-5,
pretrained_model = None,
frameskip = 4
):
"""
Inputs:
- game: string to select the game
- mem_size: int length of the replay memory
- state_buffer_size: int number of recent frames used as input for neural network
- batch_size: int
- learning_rate: float
- pretrained_model: str path to the model
- record: boolean to enable record option
"""
# Namestring
self.game = game
# Environment
self.env = Environment(game_name[game], dimensions[game], frameskip=frameskip)
# Cuda
self.use_cuda = torch.cuda.is_available()
# Neural network
self.net = DQN(channels_in = state_buffer_size,
num_actions = self.env.get_number_of_actions())
self.target_net = DQN(channels_in = state_buffer_size,
num_actions = self.env.get_number_of_actions())
if self.use_cuda:
self.net.cuda()
self.target_net.cuda()
if pretrained_model:
self.net.load(pretrained_model)
self.target_net.load(pretrained_model)
self.pretrained_model = True
else:
self.pretrained_model = False
# Optimizer
self.learning_rate = learning_rate
self.optimizer = optim.Adam(self.net.parameters(), lr=learning_rate)
#self.optimizer = optim.RMSprop(self.net.parameters(), lr=learning_rate,alpha=0.95, eps=0.01)
self.batch_size = batch_size
self.optimize_each_k = 1
self.update_target_net_each_k_steps = 10000
self.noops_count = 0
# Replay Memory (Long term memory)
self.replay = ReplayMemory(capacity=mem_size, num_history_frames=state_buffer_size)
self.mem_size = mem_size
# Fill replay memory before training
if not self.pretrained_model:
self.start_train_after = 50000
else:
self.start_train_after = mem_size//2
# Buffer for the most recent states (Short term memory)
self.num_stored_frames = state_buffer_size
# Steps
self.steps = 0
# Save net
self.save_net_each_k_episodes = 500
def select_action(self, observation, mode='train'):
"""
Select an random action from action space or an proposed action
from neural network depending on epsilon
Inputs:
- observation: np.array with the observation
Returns:
action: int
"""
# Hyperparameters
EPSILON_START = 1
EPSILON_END = 0.1
EPSILON_DECAY = 1000000
EPSILON_PLAY = 0.01
MAXNOOPS = 30
# Decrease of epsilon value
if not self.pretrained_model:
#epsilon = EPSILON_END + (EPSILON_START - EPSILON_END) * \
# np.exp(-1. * (self.steps-self.batch_size) / EPSILON_DECAY)
epsilon = EPSILON_START - self.steps * (EPSILON_START - EPSILON_END) / EPSILON_DECAY
elif mode=='play':
epsilon = EPSILON_PLAY
else:
epsilon = EPSILON_END
if epsilon < random():
# Action according to neural net
# Wrap tensor into variable
state_variable = Variable(observation, volatile=True)
# Evaluate network and return action with maximum of activation
action = self.net(state_variable).data.max(1)[1].view(1,1)
# Prevent noops
if action[0,0]!=1:
self.noops_count += 1
if self.noops_count == MAXNOOPS:
action[0,0] = 1
self.noops_count = 0
else:
self.noops_count = 0
else:
# Random action
action = self.env.sample_action()
action = LongTensor([[action]])
return action
def optimize(self, net_updates):
"""
Optimizer function
Inputs:
- net_updates: int
Returns:
- loss: float
- q_value: float
- exp_q_value: float
"""
# Hyperparameter
GAMMA = 0.99
# not enough memory yet
if len(self.replay) < self.start_train_after:
return
# Sample a transition
batch = self.replay.sampleTransition(self.batch_size)
# Mask to indicate which states are not final (=done=game over)
non_final_mask = ByteTensor(list(map(lambda ns: ns is not None, batch.next_state)))
# Wrap tensors in variables
state_batch = Variable(torch.cat(batch.state))
action_batch = Variable(torch.cat(batch.action))
reward_batch = Variable(torch.cat(batch.reward))
non_final_next_states = Variable(torch.cat([ns for ns in batch.next_state if ns is not None]),
volatile=True) # volatile==true prevents calculation of the derivative
next_state_values = Variable(torch.zeros(self.batch_size).type(FloatTensor), volatile=False)
if self.use_cuda:
state_batch = state_batch.cuda()
action_batch = action_batch.cuda()
reward_batch = reward_batch.cuda()
non_final_mask = non_final_mask.cuda()
non_final_next_states = non_final_next_states.cuda()
next_state_values = next_state_values.cuda()
# Compute Q(s_t, a) - the self.net computes Q(s_t), then we select the
# columns of actions taken
state_action_values = self.net(state_batch).gather(1, action_batch)
# Compute V(s_{t+1}) for all next states.
next_max_values = self.target_net(non_final_next_states).detach().max(1)[0]
next_state_values[non_final_mask]= next_max_values
# Compute the expected Q values
expected_state_action_values = (next_state_values * GAMMA) + reward_batch
# Compute Huber loss
loss = F.smooth_l1_loss(state_action_values, expected_state_action_values)
self.optimizer.zero_grad()
loss.backward()
for param in self.net.parameters():
param.grad.data.clamp_(-1, 1)
self.optimizer.step()
if net_updates%self.update_target_net_each_k_steps==0:
self.target_net.load_state_dict(self.net.state_dict())
print('target_net update!')
return loss.data.cpu().numpy()[0]
def play(self, n):
"""
Play a game with the current net and render it
Inputs:
- n: games to play
"""
for i in range(n):
done = False # games end indicator variable
score = 0
# Reset game
screen = self.env.reset()
# list of k last frames
last_k_frames = []
for j in range(self.num_stored_frames):
last_k_frames.append(None)
last_k_frames[j] = gray2pytorch(screen)
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
while not done:
action = self.select_action(state, mode='play')[0,0]
screen, reward, _, done, _ = self.env.step(action, mode='play')
score += reward
# save latest frame, discard oldest
for j in range(self.num_stored_frames-1):
last_k_frames[j] = last_k_frames[j+1]
last_k_frames[self.num_stored_frames-1] = gray2pytorch(screen)
# convert frames to range 0 to 1 again
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
self.state = state
print('Game ({}/{}) - Final score {}: {}'.format(i+1, n, self.game, score))
self.env.game.close()
def play_stats(self, n_games, mode='random'):
"""
Play N games randomly or evaluate a net and log results for statistics
Input:
- n_games: int Number of games to play
- mode: str 'random' or 'evaluation'
"""
# Subdirectory for logging
sub_dir = mode + '_' + self.game + '/'
if not os.path.exists(sub_dir):
os.makedirs(sub_dir)
# Store history
reward_history = []
reward_clamped_history = []
# Number of actions to sample from
n_actions = self.env.get_number_of_actions()
for i_episode in range(1, n_games+1):
# Reset game
screen = self.env.reset()
# Store screen
if mode=='evaluation':
# list of k last frames
last_k_frames = []
for j in range(self.num_stored_frames):
last_k_frames.append(None)
last_k_frames[j] = gray2pytorch(screen)
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
# games end indicator variable
done = False
# reset score with initial lives, because every lost live adds -1
total_reward = 0
total_reward_clamped = self.env.get_lives()
while not done:
if mode=='random':
action = randrange(n_actions)
elif mode=='evaluation':
action = self.select_action(state, mode='play')[0,0]
screen, reward, reward_clamped, done, _ = self.env.step(action)
total_reward += int(reward)
total_reward_clamped += int(reward_clamped)
if mode=='evaluation':
# save latest frame, discard oldest
for j in range(self.num_stored_frames-1):
last_k_frames[j] = last_k_frames[j+1]
last_k_frames[self.num_stored_frames-1] = gray2pytorch(screen)
# convert frames to range 0 to 1 again
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
# Print current result
print('Episode: {:6}/{:6} | '.format(i_episode, n_games),
'score: ({:4}/{:4})'.format(total_reward_clamped,total_reward))
# Save rewards
reward_history.append(total_reward)
reward_clamped_history.append(total_reward_clamped)
avg_reward = np.sum(reward_history)/len(reward_history)
avg_reward_clamped = np.sum(reward_clamped_history)/len(reward_clamped_history)
# Print final result
print('\n\n=============================================\n' +
'avg score after {:6} episodes: ({:.2f}/{:.2f})\n'.format(n_games, avg_reward_clamped, avg_reward))
# Log results to files
with open(sub_dir + mode + '.txt', 'w') as fp:
fp.write('avg score after {:6} episodes: ({:.2f}/{:.2f})\n'.format(n_games, avg_reward_clamped, avg_reward))
with open(sub_dir + mode + '_reward.pickle', 'wb') as fp:
pickle.dump(reward_history, fp)
with open(sub_dir + mode + '_reward_clamped.pickle', 'wb') as fp:
pickle.dump(reward_clamped_history, fp)
def train(self):
"""
Train the agent
"""
num_episodes = 100000
net_updates = 0
# Logging
sub_dir = self.game + '_' + datetime.now().strftime('%Y%m%d_%H%M%S') + '/'
os.makedirs(sub_dir)
logfile = sub_dir + self.game + '_train.txt'
loss_file = sub_dir + 'loss.pickle'
reward_file = sub_dir + 'reward.pickle'
reward_clamped_file = sub_dir + 'reward_clamped.pickle'
log_avg_episodes = 50
best_score = 0
best_score_clamped = 0
avg_score = 0
avg_score_clamped = 0
loss_history = []
reward_history = []
reward_clamped_history = []
# Initialize logfile with header
with open(logfile, 'w') as fp:
fp.write(datetime.now().strftime('%Y-%m-%d %H:%M:%S') + '\n' +
'Trained game: ' + str(self.game) + '\n' +
'Learning rate: ' + str(self.learning_rate) + '\n' +
'Batch size: ' + str(self.batch_size) + '\n' +
'Memory size(replay): ' + str(self.mem_size) + '\n' +
'Pretrained: ' + str(self.pretrained_model) + '\n' +
'Started training after k frames: ' + str(self.start_train_after) + '\n' +
'Optimized after k frames: ' + str(self.optimize_each_k) + '\n' +
'Target net update after k frame: ' + str(self.update_target_net_each_k_steps) + '\n\n' +
'------------------------------------------------------' +
'--------------------------------------------------\n')
print('Started training...\nLogging to', sub_dir)
for i_episode in range(1,num_episodes):
# reset game at the start of each episode
screen = self.env.reset()
# list of k last frames
last_k_frames = []
for j in range(self.num_stored_frames):
last_k_frames.append(None)
last_k_frames[j] = gray2pytorch(screen)
if i_episode == 1:
self.replay.pushFrame(last_k_frames[0].cpu())
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
done = False # games end indicator variable
# reset score with initial lives, because every lost live adds -1
total_reward = 0
total_reward_clamped = self.env.get_lives()
# Loop over one game
while not done:
self.steps +=1
action = self.select_action(state)
# perform selected action on game
screen, reward, reward_clamped, done, _ = self.env.step(action[0,0])
total_reward += int(reward)
total_reward_clamped += int(reward_clamped)
# Wrap into tensor
reward = torch.Tensor([reward_clamped])
# save latest frame, discard oldest
for j in range(self.num_stored_frames-1):
last_k_frames[j] = last_k_frames[j+1]
last_k_frames[self.num_stored_frames-1] = gray2pytorch(screen)
# convert frames to range 0 to 1 again
if not done:
next_state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
else:
next_state = None
# Store transition
self.replay.pushFrame(last_k_frames[self.num_stored_frames - 1].cpu())
self.replay.pushTransition((self.replay.getCurrentIndex()-1)%self.replay.capacity, action, reward, done)
# only optimize each kth step
if self.steps%self.optimize_each_k == 0:
loss = self.optimize(net_updates)
# Logging
loss_history.append(loss)
#q_history.append(q_value)
#exp_q_history.append(exp_q_value)
net_updates += 1
# set current state to next state to select next action
if next_state is not None:
state = next_state
if self.use_cuda:
state = state.cuda()
# plays episode until there are no more lives left ( == done)
if done:
break;
# Save rewards
reward_history.append(total_reward)
reward_clamped_history.append(total_reward_clamped)
print('Episode: {:6} | '.format(i_episode),
'steps {:8} | '.format(self.steps),
'loss: {:.2E} | '.format(loss if loss else 0),
'score: ({:4}/{:4}) | '.format(total_reward_clamped,total_reward),
'best score: ({:4}/{:4}) | '.format(best_score_clamped,best_score),
'replay size: {:7}'.format(len(self.replay)))
avg_score_clamped += total_reward_clamped
avg_score += total_reward
if total_reward_clamped > best_score_clamped:
best_score_clamped = total_reward_clamped
if total_reward > best_score:
best_score = total_reward
if i_episode % log_avg_episodes == 0 and i_episode!=0:
avg_score_clamped /= log_avg_episodes
avg_score /= log_avg_episodes
print('----------------------------------------------------------------'
'-----------------------------------------------------------------',
'\nLogging to file: \nEpisode: {:6} '.format(i_episode),
'steps: {:8} '.format(self.steps),
'avg on last {:4} games ({:6.1f}/{:6.1f}) '.format(log_avg_episodes, avg_score_clamped,avg_score),
'best score: ({:4}/{:4})'.format(best_score_clamped, best_score),
'\n---------------------------------------------------------------'
'------------------------------------------------------------------')
# Logfile
with open(logfile, 'a') as fp:
fp.write('Episode: {:6} | '.format(i_episode) +
'steps: {:8} | '.format(self.steps) +
'avg on last {:4} games ({:6.1f}/{:6.1f}) | '.format(log_avg_episodes, avg_score_clamped,avg_score) +
'best score: ({:4}/{:4})\n'.format(best_score_clamped, best_score))
# Dump loss & reward
with open(loss_file, 'wb') as fp:
pickle.dump(loss_history, fp)
with open(reward_file, 'wb') as fp:
pickle.dump(reward_history, fp)
with open(reward_clamped_file, 'wb') as fp:
pickle.dump(reward_clamped_history, fp)
avg_score_clamped = 0
avg_score = 0
if i_episode % self.save_net_each_k_episodes == 0:
with open(logfile, 'a') as fp:
fp.write('Saved model at episode ' + str(i_episode) + '...\n')
self.target_net.save(sub_dir + self.game + '-' + str(i_episode) + '_episodes.model')
print('Training done!')
self.target_net.save(sub_dir + self.game + '.model')
class Agent(object):
def __init__(
self,
game,
mem_size=512 * 512, #1024*512,
state_buffer_size=4,
batch_size=64,
learning_rate=1e-5,
pretrained_model=None,
frameskip=4, #1
record=False):
"""
Inputs:
- game: string to select the game
- mem_size: int length of the replay memory
- state_buffer_size: int number of recent frames used as input for neural network
- batch_size: int
- learning_rate: float
- pretrained_model: str path to the model
- record: boolean to enable record option
"""
# Namestring
self.game = game
# dimensions: tuple (h1,h2,w1,w2) with dimensions of the game (to crop borders)
#if self.game == 'Breakout-v0':
# dimensions = (32, 195, 8, 152)
#elif self.game == 'SpaceInvaders-v0':
# dimensions = (21, 195, 20, 141)
#elif self.game == 'Assault-v0':
# dimensions = (50, 240, 5, 155)
#elif self.game == 'Phoenix-v0':
# dimensions = (23, 183, 0, 160)
#elif self.game == 'Skiing-v0':
# dimensions = (55, 202, 8, 152)
#elif self.game == 'Enduro-v0':
# dimensions = (50, 154, 8, 160)
#elif self.game == 'BeamRider-v0':
# dimensions = (32, 180, 9, 159)
if self.game == 'BreakoutAndSpace':
dimensions_break = (32, 195, 8, 152)
dimensions_space = (21, 195, 20, 141)
elif self.game != 'BreakoutAndSpace':
print(
'Error! This version is for playing BreakOut and SpaceInvaders at the same time.'
)
# Environment
self.env_break = Environment('BreakoutNoFrameskip-v4',
dimensions_break,
frameskip=frameskip)
self.env_space = Environment('SpaceInvaders-v0',
dimensions_space,
frameskip=frameskip)
# Cuda
self.use_cuda = torch.cuda.is_available()
# Neural network
self.net = DQN(channels_in=state_buffer_size,
num_actions=self.env_space.get_number_of_actions())
self.target_net = DQN(
channels_in=state_buffer_size,
num_actions=self.env_space.get_number_of_actions())
if self.use_cuda:
self.net.cuda()
self.target_net.cuda()
if pretrained_model:
self.net.load(pretrained_model)
self.target_net.load(pretrained_model)
self.pretrained_model = True
else:
self.pretrained_model = False
# Optimizer
self.learning_rate = learning_rate
self.optimizer = optim.Adam(self.net.parameters(), lr=learning_rate)
#self.optimizer = optim.RMSprop(self.net.parameters(), lr = 0.00025,alpha=0.95, eps=0.01)
self.batch_size = batch_size
self.optimize_each_k = 4
self.update_target_net_each_k_steps = 10000
self.noops_count = 0
# Replay Memory (Long term memory)
self.replay = ReplayMemory(capacity=mem_size,
num_history_frames=state_buffer_size)
self.mem_size = mem_size
# Fill replay memory before training
if not self.pretrained_model:
self.start_train_after = 25000
else:
self.start_train_after = mem_size // 2
# Buffer for the most recent states (Short term memory)
self.num_stored_frames = state_buffer_size
# Steps
self.steps = 0
# Save net
self.save_net_each_k_episodes = 500
def select_action(self, observation, mode='train'):
"""
Select an random action from action space or an proposed action
from neural network depending on epsilon
Inputs:
- observation: np.array with the observation
Returns:
action: int
"""
# Hyperparameters
EPSILON_START = 1
EPSILON_END = 0.1
EPSILON_DECAY = 1000000
MAXNOOPS = 30
# Decrease of epsilon value
if not self.pretrained_model:
#epsilon = EPSILON_END + (EPSILON_START - EPSILON_END) * \
# np.exp(-1. * (self.steps-self.batch_size) / EPSILON_DECAY)
epsilon = EPSILON_START - self.steps * (
EPSILON_START - EPSILON_END) / EPSILON_DECAY
else:
epsilon = EPSILON_END
if epsilon > random() or mode == 'play':
# Action according to neural net
# Wrap tensor into variable
state_variable = Variable(observation, volatile=True)
# Evaluate network and return action with maximum of activation
action = self.net(state_variable).data.max(1)[1].view(1, 1)
# Prevent noops
if action[0, 0] == 0:
self.noops_count += 1
if self.noops_count == MAXNOOPS:
action[0, 0] = 1
self.noops_count = 0
else:
self.noops_count = 0
else:
# Random action
action = self.env_space.sample_action()
action = LongTensor([[action]])
return action
def optimize(self, net_updates):
"""
Optimizer function
Inputs:
- net_updates: int
Returns:
- loss: float
- q_value: float
- exp_q_value: float
"""
# Hyperparameter
GAMMA = 0.99
# not enough memory yet
if len(self.replay) < self.start_train_after:
return
# Sample a transition
batch = self.replay.sampleTransition(self.batch_size)
# Mask to indicate which states are not final (=done=game over)
non_final_mask = ByteTensor(
list(map(lambda ns: ns is not None, batch.next_state)))
# Wrap tensors in variables
state_batch = Variable(torch.cat(batch.state))
action_batch = Variable(torch.cat(batch.action))
reward_batch = Variable(torch.cat(batch.reward))
non_final_next_states = Variable(
torch.cat([ns for ns in batch.next_state if ns is not None]),
volatile=True
) # volatile==true prevents calculation of the derivative
next_state_values = Variable(torch.zeros(
self.batch_size).type(FloatTensor),
volatile=False)
if self.use_cuda:
state_batch = state_batch.cuda()
action_batch = action_batch.cuda()
reward_batch = reward_batch.cuda()
non_final_mask = non_final_mask.cuda()
non_final_next_states = non_final_next_states.cuda()
next_state_values = next_state_values.cuda()
# Compute Q(s_t, a) - the self.net computes Q(s_t), then we select the
# columns of actions taken
state_action_values = self.net(state_batch).gather(1, action_batch)
# Compute V(s_{t+1}) for all next states.
next_max_values = self.target_net(non_final_next_states).detach().max(
1)[0]
next_state_values[non_final_mask] = next_max_values
# Compute the expected Q values
expected_state_action_values = (next_state_values *
GAMMA) + reward_batch
# Compute Huber loss
loss = F.smooth_l1_loss(state_action_values,
expected_state_action_values)
self.optimizer.zero_grad()
loss.backward()
for param in self.net.parameters():
param.grad.data.clamp_(-1, 1)
self.optimizer.step()
if net_updates % self.update_target_net_each_k_steps == 0:
self.target_net.load_state_dict(self.net.state_dict())
print('target_net update!')
return loss.data.cpu().numpy()[0]
def play(self):
"""
Play a game with the current net and render it
"""
done = False # games end indicator variable
score = 0
# Reset game
screen_break = self.env_break.reset()
screen_space = self.env_space.reset()
# list of k last frames
############old version:
#breakout part
#last_k_frames_break = []
#for j in range(self.num_stored_frames):
# last_k_frames_break.append(None)
# last_k_frames_break[j] = gray2pytorch(screen_break)
#spaceinvaders part
#last_k_frames_space = []
#for j in range(self.num_stored_frames):
# last_k_frames_space.append(None)
# last_k_frames_space[j] = gray2pytorch(screen_space)
#################
last_k_frames = []
for j in range(self.num_stored_frames):
last_k_frames.append(None)
last_k_frames[j] = torch.cat(
(gray2pytorch(screen_break), gray2pytorch(screen_space)),
dim=2)
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
############old version:
#state_break = torch.cat(last_k_frames_break, 1).type(FloatTensor) / 255.0
#state_space = torch.cat(last_k_frames_space, 1).type(FloatTensor) / 255.0
#state = torch.cat((state_break,state_space), 2)
state = torch.cat(last_k_frames, 1).type(FloatTensor) / 255.0
while not done:
action = self.select_action(state, mode='play')
# Render game
self.env_break.game.render(mode='human')
self.env_space.game.render(mode='human')
# maps actions from space invaders to breakout (shot-left to left, shot-right to right)
if action[0, 0] == 4:
action_break = 2
elif action[0, 0] == 5:
action_break = 3
elif action[0, 0] != 5:
action_break = action[0, 0]
screen_break, _, reward_break, done_break, info_break = self.env_break.step(
action_break, mode='play')
screen_space, _, reward_space, done_space, info_space = self.env_space.step(
action[0, 0], mode='play')
score += reward_break
score += reward_space
done = done_break or done_space
############old
# save latest frame, discard oldest
#for j in range(self.num_stored_frames - 1):
# last_k_frames_break[j] = last_k_frames_break[j + 1]
# last_k_frames_space[j] = last_k_frames_space[j + 1]
#last_k_frames_break[self.num_stored_frames - 1] = gray2pytorch(screen_break)
#last_k_frames_space[self.num_stored_frames - 1] = gray2pytorch(screen_space)
# convert frames to range 0 to 1 again
#state_break = torch.cat(last_k_frames_break, 1).type(FloatTensor) / 255.0
#state_space = torch.cat(last_k_frames_space, 1).type(FloatTensor) / 255.0
#state = torch.cat((state_break, state_space), 2)
#############old_end
# save latest frame, discard oldest
for j in range(self.num_stored_frames - 1):
last_k_frames[j] = last_k_frames[j + 1]
last_k_frames[self.num_stored_frames - 1] = torch.cat(
(gray2pytorch(screen_break), gray2pytorch(screen_space)),
dim=2)
# convert frames to range 0 to 1 again
state = torch.cat(last_k_frames, 1).type(FloatTensor) / 255.0
done = done_break or done_space
print('Final score:', score)
self.env.game.close() #for both changen
def train(self):
"""
Train the agent
"""
num_episodes = 100000
net_updates = 0
# Logging
sub_dir = self.game + '_' + datetime.now().strftime(
'%Y%m%d_%H%M%S') + '/'
os.makedirs(sub_dir)
logfile = sub_dir + self.game + '_train.log'
loss_file = sub_dir + 'loss.pickle'
reward_file = sub_dir + 'reward.pickle'
reward_clamped_file = sub_dir + 'reward_clamped.pickle'
log_avg_episodes = 50
best_score = 0
best_score_clamped = 0
avg_score = 0
avg_score_clamped = 0
loss_history = []
reward_history = []
reward_clamped_history = []
# Initialize logfile with header
with open(logfile, 'w') as fp:
fp.write(
datetime.now().strftime('%Y%m%d_%H%M%S') + '\n' +
'Trained game: ' + str(self.game) + '\n' +
'Learning rate: ' + str(self.learning_rate) + '\n' +
'Batch size: ' + str(self.batch_size) + '\n' +
'Pretrained: ' + str(self.pretrained_model) + '\n' +
'Started training after k frames: ' +
str(self.start_train_after) + '\n' +
'Optimized after k frames: ' + str(self.optimize_each_k) +
'\n' + 'Target net update after k frame: ' +
str(self.update_target_net_each_k_steps) + '\n\n' +
'--------------------------------------------------------------------------------\n'
)
print('Started training...\nLogging to', sub_dir)
for i_episode in range(1, num_episodes):
# reset game at the start of each episode
screen_break = self.env_break.reset()
screen_space = self.env_space.reset()
# list of k last frames
last_k_frames_break = []
last_k_frames_space = []
for j in range(self.num_stored_frames):
last_k_frames_break.append(None)
last_k_frames_space.append(None)
last_k_frames_break[j] = gray2pytorch(screen_break)
last_k_frames_space[j] = gray2pytorch(screen_space)
if i_episode == 1:
frames_both = torch.cat((last_k_frames_break[0].cpu(),
last_k_frames_space[0].cpu()), 2)
#self.replay.pushFrame(last_k_frames_break[0].cpu())
#self.replay.pushFrame(last_k_frames_space[0].cpu())
self.replay.pushFrame(frames_both)
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
state_break = torch.cat(last_k_frames_break,
1).type(FloatTensor) / 255.0
state_space = torch.cat(last_k_frames_space,
1).type(FloatTensor) / 255.0
state = torch.cat((state_break, state_space), 2)
done = False # games end indicator variable
# reset score with initial lives, because every lost live adds -1
total_reward = self.env_break.get_lives()
total_reward += self.env_space.get_lives()
total_reward_clamped = self.env_break.get_lives()
total_reward_clamped += self.env_space.get_lives()
###########
# Loop over one game
while not done:
self.steps += 1
action = self.select_action(state)
# perform selected action on game
# screen, reward, done, info = self.env.step(action[0,0])#envTest.step(action[0,0])
#maps actions from space invaders to breakout (shot-left to left, shot-right to right)
screen_space, _, reward_space, done_space, info_space = self.env_space.step(
action[0, 0])
action_break = action[0, 0]
if action_break > 3: #shoot+right/left --> right/left
action_break = action_break - 2
screen_break, _, reward_break, done_break, info_break = self.env_break.step(
action_break)
total_reward += int(reward_break)
total_reward += int(reward_space)
done = done_break or done_space
# clamp rewards
reward_break = torch.Tensor([np.clip(reward_break, -1, 1)])
reward_space = torch.Tensor([np.clip(reward_space, -1, 1)])
reward = reward_break + reward_space
total_reward_clamped += int(reward_break[0])
total_reward_clamped += int(reward_space[0])
# save latest frame, discard oldest
for j in range(self.num_stored_frames - 1):
last_k_frames_break[j] = last_k_frames_break[j + 1]
last_k_frames_space[j] = last_k_frames_space[j + 1]
last_k_frames_break[self.num_stored_frames -
1] = gray2pytorch(screen_break)
last_k_frames_space[self.num_stored_frames -
1] = gray2pytorch(screen_space)
# convert frames to range 0 to 1 again
if not done:
next_state_break = torch.cat(last_k_frames_break,
1).type(FloatTensor) / 255.0
next_state_space = torch.cat(last_k_frames_space,
1).type(FloatTensor) / 255.0
next_state = torch.cat(
(next_state_break, next_state_space), 2)
else:
next_state = None
#Store transition
#Frame concat, Trasition not (try)
frame_break = last_k_frames_break[self.num_stored_frames -
1].cpu()
frame_space = last_k_frames_space[self.num_stored_frames -
1].cpu()
frame_both = torch.cat((frame_break, frame_space), 2)
self.replay.pushFrame(frame_both)
self.replay.pushTransition(
(self.replay.getCurrentIndex() - 1) % self.replay.capacity,
action, reward, done)
# only optimize each kth step
if self.steps % self.optimize_each_k == 0:
loss = self.optimize(net_updates)
# Logging
loss_history.append(loss)
#q_history.append(q_value)
#exp_q_history.append(exp_q_value)
net_updates += 1
# set current state to next state to select next action
if next_state is not None:
state = next_state
if self.use_cuda:
state = state.cuda()
# plays episode until there are no more lives left ( == done)
if done:
break
# Save rewards
reward_history.append(total_reward)
reward_clamped_history.append(total_reward_clamped)
print(
'Episode: {:6} | '.format(i_episode),
'steps {:8} | '.format(self.steps),
'loss: {:.2E} | '.format(loss if loss else 0),
'score: ({:4}/{:4}) | '.format(total_reward_clamped,
total_reward),
'best score: ({:4}/{:4}) | '.format(best_score_clamped,
best_score),
'replay size: {:7}'.format(len(self.replay)))
avg_score_clamped += total_reward_clamped
avg_score += total_reward
if total_reward_clamped > best_score_clamped:
best_score_clamped = total_reward_clamped
if total_reward > best_score:
best_score = total_reward
if i_episode % log_avg_episodes == 0 and i_episode != 0:
avg_score_clamped /= log_avg_episodes
avg_score /= log_avg_episodes
print(
'----------------------------------------------------------------'
'-----------------------------------------------------------------',
'\nLogging to file: \nEpisode: {:6} '.format(i_episode),
'steps: {:8} '.format(self.steps),
'avg on last {:4} games ({:6.1f}/{:6.1f}) '.format(
log_avg_episodes, avg_score_clamped, avg_score),
'best score: ({:4}/{:4})'.format(best_score_clamped,
best_score),
'\n---------------------------------------------------------------'
'------------------------------------------------------------------'
)
# Logfile
with open(logfile, 'a') as fp:
fp.write(
'Episode: {:6} | '.format(i_episode) +
'steps: {:8} | '.format(self.steps) +
'avg on last {:4} games ({:6.1f}/{:6.1f}) | '.format(
log_avg_episodes, avg_score_clamped, avg_score) +
'best score: ({:4}/{:4})\n'.format(
best_score_clamped, best_score))
# Dump loss & reward
with open(loss_file, 'wb') as fp:
pickle.dump(loss_history, fp)
with open(reward_file, 'wb') as fp:
pickle.dump(reward_history, fp)
with open(reward_clamped_file, 'wb') as fp:
pickle.dump(reward_clamped_history, fp)
avg_score_clamped = 0
avg_score = 0
if i_episode % self.save_net_each_k_episodes == 0:
with open(logfile, 'a') as fp:
fp.write('Saved model at episode ' + str(i_episode) +
'...\n')
self.target_net.save(sub_dir + self.game + '-' +
str(i_episode) + '_episodes.model')
print('Training done!')
self.target_net.save(sub_dir + self.game + '.model')
def __init__(self,
game1,
game2,
mem_size = 1000000,
state_buffer_size = 4,
batch_size = 64,
learning_rate = 1e-5,
pretrained_model = None,
pretrained_subnet1 = False,
pretrained_subnet2 = False,
frameskip = 4,
frozen = False
):
"""
Inputs:
- game 1: string to select the game 1
- game 2: string to select the game 2
- mem_size: int length of the replay memory
- state_buffer_size: int number of recent frames used as input for neural network
- batch_size: int
- learning_rate: float
- pretrained_model: str path to the model
- pretrained_subnet1: str path to the model of the subnet
- pretrained_subnet2: str path to the model of the subnet
- frozen: boolean freeze pretrained subnets
"""
# Namestring
self.game1 = game1
self.game2 = game2
# Environment
self.env1 = Environment(game_name[game1], dimensions[game1], frameskip=frameskip)
self.env2 = Environment(game_name[game2], dimensions[game2], frameskip=frameskip)
# Neural net
self.pretrained_subnet1 = pretrained_subnet1
self.pretrained_subnet2 = pretrained_subnet2
self.net = TwinDQN(channels_in = state_buffer_size,
num_actions = self.env2.get_number_of_actions(),
pretrained_subnet1 = pretrained_subnet1,
pretrained_subnet2 = pretrained_subnet2,
frozen = frozen)
self.target_net = TwinDQN(channels_in = state_buffer_size,
num_actions = self.env2.get_number_of_actions(),
pretrained_subnet1 = pretrained_subnet1,
pretrained_subnet2 = pretrained_subnet2,
frozen = frozen)
# Cuda
self.use_cuda = torch.cuda.is_available()
if self.use_cuda:
self.net.cuda()
self.target_net.cuda()
# Pretrained
if pretrained_model:
self.net.load(pretrained_model)
self.target_net.load(pretrained_model)
self.pretrained_model = True
else:
self.pretrained_model = False
# Optimizer
self.learning_rate = learning_rate
self.optimizer = optim.Adam(filter(lambda p: p.requires_grad, self.net.parameters()),
lr=learning_rate)
#self.optimizer = optim.RMSprop(filter(lambda p: p.requires_grad, self.net.parameters()),
# lr=learning_rate,alpha=0.95, eps=0.01)
self.batch_size = batch_size
self.optimize_each_k = 1
self.update_target_net_each_k_steps = 10000
self.noops_count = 0
# Replay Memory (Long term memory)
self.replay = ReplayMemory(capacity=mem_size, num_history_frames=state_buffer_size)
self.mem_size = mem_size
# Fill replay memory before training
if not self.pretrained_model:
self.start_train_after = 50000
else:
self.start_train_after = mem_size//2
# Buffer for the most recent states (Short term memory)
self.num_stored_frames = state_buffer_size
# Steps
self.steps = 0
# Save net
self.save_net_each_k_episodes = 500
class DoubleAgent(object):
def __init__(self,
game1,
game2,
mem_size = 1000000,
state_buffer_size = 4,
batch_size = 64,
learning_rate = 1e-5,
pretrained_model = None,
pretrained_subnet1 = False,
pretrained_subnet2 = False,
frameskip = 4,
frozen = False
):
"""
Inputs:
- game 1: string to select the game 1
- game 2: string to select the game 2
- mem_size: int length of the replay memory
- state_buffer_size: int number of recent frames used as input for neural network
- batch_size: int
- learning_rate: float
- pretrained_model: str path to the model
- pretrained_subnet1: str path to the model of the subnet
- pretrained_subnet2: str path to the model of the subnet
- frozen: boolean freeze pretrained subnets
"""
# Namestring
self.game1 = game1
self.game2 = game2
# Environment
self.env1 = Environment(game_name[game1], dimensions[game1], frameskip=frameskip)
self.env2 = Environment(game_name[game2], dimensions[game2], frameskip=frameskip)
# Neural net
self.pretrained_subnet1 = pretrained_subnet1
self.pretrained_subnet2 = pretrained_subnet2
self.net = TwinDQN(channels_in = state_buffer_size,
num_actions = self.env2.get_number_of_actions(),
pretrained_subnet1 = pretrained_subnet1,
pretrained_subnet2 = pretrained_subnet2,
frozen = frozen)
self.target_net = TwinDQN(channels_in = state_buffer_size,
num_actions = self.env2.get_number_of_actions(),
pretrained_subnet1 = pretrained_subnet1,
pretrained_subnet2 = pretrained_subnet2,
frozen = frozen)
# Cuda
self.use_cuda = torch.cuda.is_available()
if self.use_cuda:
self.net.cuda()
self.target_net.cuda()
# Pretrained
if pretrained_model:
self.net.load(pretrained_model)
self.target_net.load(pretrained_model)
self.pretrained_model = True
else:
self.pretrained_model = False
# Optimizer
self.learning_rate = learning_rate
self.optimizer = optim.Adam(filter(lambda p: p.requires_grad, self.net.parameters()),
lr=learning_rate)
#self.optimizer = optim.RMSprop(filter(lambda p: p.requires_grad, self.net.parameters()),
# lr=learning_rate,alpha=0.95, eps=0.01)
self.batch_size = batch_size
self.optimize_each_k = 1
self.update_target_net_each_k_steps = 10000
self.noops_count = 0
# Replay Memory (Long term memory)
self.replay = ReplayMemory(capacity=mem_size, num_history_frames=state_buffer_size)
self.mem_size = mem_size
# Fill replay memory before training
if not self.pretrained_model:
self.start_train_after = 50000
else:
self.start_train_after = mem_size//2
# Buffer for the most recent states (Short term memory)
self.num_stored_frames = state_buffer_size
# Steps
self.steps = 0
# Save net
self.save_net_each_k_episodes = 500
def select_action(self, observation, mode='train'):
"""
Select an random action from action space or an proposed action
from neural network depending on epsilon
Inputs:
- observation: np.array with the observation
Returns:
- action: int
"""
# Hyperparameters
EPSILON_START = 1
EPSILON_END = 0.1
EPSILON_DECAY = 1000000
EPSILON_PLAY = 0.01
MAXNOOPS = 30
# Decrease of epsilon value
if not self.pretrained_model:
#epsilon = EPSILON_END + (EPSILON_START - EPSILON_END) * \
# np.exp(-1. * (self.steps-self.batch_size) / EPSILON_DECAY)
epsilon = EPSILON_START - self.steps * (EPSILON_START - EPSILON_END) / EPSILON_DECAY
elif mode=='play':
epsilon = EPSILON_PLAY
else:
epsilon = EPSILON_END
if epsilon < random():
# Action according to neural net
# Wrap tensor into variable
state_variable = Variable(observation, volatile=True)
# Evaluate network and return action with maximum of activation
action = self.net(state_variable).data.max(1)[1].view(1,1)
# Prevent noops
if action[0,0]!=1:
self.noops_count += 1
if self.noops_count == MAXNOOPS:
action[0,0] = 1
self.noops_count = 0
else:
self.noops_count = 0
else:
# Random action
action = self.env2.sample_action()
action = LongTensor([[action]])
return action
def map_action(self, action):
"""
Maps action from game with more actions
to game with less actions
Inputs:
- action: int
Returns:
- action: int
"""
# Map SpaceInvaders on Breakout
if self.game1=='Breakout' and self.game2=='SpaceInvaders':
if action>3: # shoot+right/left --> right/left
return action-2
# Map Assault on SpaceInvaders
if self.game1=='SpaceInvaders' and self.game2=='Assault':
if action!=0: # all actions except 2nd idle
return action-1
# Map Phoenix on SpaceInvaders
if self.game1=='SpaceInvaders' and self.game2=='Phoenix':
if action==4: # shield --> idle
return 0
if action==7: # shield+shot --> shot
return 1
if action>4: # shoot+right/left --> shoot+right/left
return action-1
# Map Phoenix on Assault
if self.game1=='Assault' and self.game2=='Phoenix':
if action==4: # shield --> idle
return 0
if action==7: # shield+shot --> shot
return 2
if 1<= action and action<=3: # shot/right/left --> shot/right/left
return action+1
# No mapping necessary
return action
def optimize(self, net_updates):
"""
Optimizer function
Inputs:
- net_updates: int
Returns:
- loss: float
- q_value: float
- exp_q_value: float
"""
# Hyperparameter
GAMMA = 0.99
# not enough memory yet
if len(self.replay) < self.start_train_after:
return
# Sample a transition
batch = self.replay.sampleTransition(self.batch_size)
# Mask to indicate which states are not final (=done=game over)
non_final_mask = ByteTensor(list(map(lambda ns: ns is not None, batch.next_state)))
# Wrap tensors in variables
state_batch = Variable(torch.cat(batch.state))
action_batch = Variable(torch.cat(batch.action))
reward_batch = Variable(torch.cat(batch.reward))
non_final_next_states = Variable(torch.cat([ns for ns in batch.next_state if ns is not None]),
volatile=True) # volatile==true prevents calculation of the derivative
next_state_values = Variable(torch.zeros(self.batch_size).type(FloatTensor), volatile=False)
if self.use_cuda:
state_batch = state_batch.cuda()
action_batch = action_batch.cuda()
reward_batch = reward_batch.cuda()
non_final_mask = non_final_mask.cuda()
non_final_next_states = non_final_next_states.cuda()
next_state_values = next_state_values.cuda()
# Compute Q(s_t, a) - the self.net computes Q(s_t), then we select the
# columns of actions taken
state_action_values = self.net(state_batch).gather(1, action_batch)
# Compute V(s_{t+1}) for all next states.
next_max_values = self.target_net(non_final_next_states).detach().max(1)[0]
next_state_values[non_final_mask]= next_max_values
# Compute the expected Q values
expected_state_action_values = (next_state_values * GAMMA) + reward_batch
# Compute Huber loss
loss = F.smooth_l1_loss(state_action_values, expected_state_action_values)
self.optimizer.zero_grad()
loss.backward()
for param in self.net.parameters():
param.grad.data.clamp_(-1, 1)
self.optimizer.step()
if net_updates%self.update_target_net_each_k_steps==0:
self.target_net.load_state_dict(self.net.state_dict())
print('target_net update!')
return loss.data.cpu().numpy()[0]
def play(self, n):
"""
Play a game with the current net and render it
Inputs:
- n: games to play
"""
for i in range(n):
done = False # games end indicator variable
# Score counter
total_reward_game1 = 0
total_reward_game2 = 0
total_reward = 0
# Reset game
screen1 = self.env1.reset()
screen2 = self.env2.reset()
# list of k last frames
last_k_frames = []
for j in range(self.num_stored_frames):
last_k_frames.append(None)
last_k_frames[j] = torch.cat((gray2pytorch(screen1),gray2pytorch(screen2)),dim=1)
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
while not done:
action = self.select_action(state, mode='play')[0,0]
action1 = self.map_action(action)
action2 = action
# perform selected action on game
screen1, reward1, _, done1, _ = self.env1.step(action1, mode='play')
screen2, reward2, _, done2, _ = self.env2.step(action2, mode='play')
# Logging
total_reward_game1 += int(reward1)
total_reward_game2 += int(reward2)
total_reward += int(reward1) + int(reward2)
# save latest frame, discard oldest
for j in range(self.num_stored_frames-1):
last_k_frames[j] = last_k_frames[j+1]
last_k_frames[self.num_stored_frames-1] = torch.cat((gray2pytorch(screen1),gray2pytorch(screen2)),dim=1)
# convert frames to range 0 to 1 again
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
# Merged game over indicator
done = done1 or done2
print('Final scores Game ({}/{}): {}: {} '.format(i+1, n, self.game1, total_reward_game1) +
'{}: {} '.format(self.game2, total_reward_game2) +
'total: {}'.format(total_reward))
self.env1.game.close()
self.env2.game.close()
def play_stats(self, n_games, mode='random'):
"""
Play N games randomly or evaluate a net and log results for statistics
Input:
- n_games: int Number of games to play
- mode: str 'random' or 'evaluation'
"""
# Subdirectory for logging
sub_dir = mode + '_' + self.game1 + '+' + self.game2 + '/'
if not os.path.exists(sub_dir):
os.makedirs(sub_dir)
# Store history total
reward_history = []
reward_clamped_history = []
# Store history game 1
reward_history_game1 = []
reward_clamped_history_game1 = []
# Store history game 2
reward_history_game2 = []
reward_clamped_history_game2 = []
# Number of actions to sample from
n_actions = self.env2.get_number_of_actions()
for i_episode in range(1, n_games+1):
# Reset game
screen1 = self.env1.reset()
screen2 = self.env2.reset()
# Store screen
if mode=='evaluation':
# list of k last frames
last_k_frames = []
for j in range(self.num_stored_frames):
last_k_frames.append(None)
last_k_frames[j] = torch.cat((gray2pytorch(screen1),gray2pytorch(screen2)),dim=1)
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
# games end indicator variable
done = False
# reset score with initial lives, because every lost live adds -1
total_reward_game1 = 0
total_reward_clamped_game1 = self.env1.get_lives()
total_reward_game2 = 0
total_reward_clamped_game2 = self.env2.get_lives()
# total scores for both games
total_reward = total_reward_game1 + total_reward_game2
total_reward_clamped = total_reward_clamped_game1 + total_reward_clamped_game2
while not done:
if mode=='random':
action = randrange(n_actions)
elif mode=='evaluation':
action = self.select_action(state, mode='play')[0,0]
action1 = self.map_action(action)
action2 = action
screen1, reward1, reward1_clamped, done1, _ = self.env1.step(action1)
screen2, reward2, reward2_clamped, done2, _ = self.env2.step(action2)
# Logging
total_reward_game1 += int(reward1)
total_reward_game2 += int(reward2)
total_reward += int(reward1) + int(reward2)
total_reward_clamped_game1 += reward1_clamped
total_reward_clamped_game2 += reward2_clamped
total_reward_clamped += reward1_clamped + reward2_clamped
if mode=='evaluation':
# save latest frame, discard oldest
for j in range(self.num_stored_frames-1):
last_k_frames[j] = last_k_frames[j+1]
last_k_frames[self.num_stored_frames-1] = torch.cat((gray2pytorch(screen1),gray2pytorch(screen2)),dim=1)
# convert frames to range 0 to 1 again
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
# Merged game over indicator
done = done1 or done2
# Print current result
print('Episode: {:6}/{:6} | '.format(i_episode, n_games) +
'score total: ({:6.1f}/{:7.1f}) | '.format(total_reward_clamped,total_reward) +
'score game1: ({:6.1f}/{:7.1f}) | '.format(total_reward_clamped_game1,total_reward_game1) +
'score game2: ({:6.1f}/{:7.1f})'.format(total_reward_clamped_game2,total_reward_game2))
# Save rewards
reward_history_game1.append(total_reward_game1)
reward_history_game2.append(total_reward_game2)
reward_history.append(total_reward)
reward_clamped_history_game1.append(total_reward_clamped_game1)
reward_clamped_history_game2.append(total_reward_clamped_game2)
reward_clamped_history.append(total_reward_clamped)
avg_reward_total = np.sum(reward_history) / len(reward_history)
avg_reward_total_clamped = np.sum(reward_clamped_history) / len(reward_clamped_history)
avg_reward_game1 = np.sum(reward_history_game1) / len(reward_history_game1)
avg_reward_game1_clamped = np.sum(reward_clamped_history_game1) / len(reward_clamped_history_game1)
avg_reward_game2 = np.sum(reward_history_game2) / len(reward_history_game2)
avg_reward_game2_clamped = np.sum(reward_clamped_history_game2) / len(reward_clamped_history_game2)
# Print final result
print('\n\n===========================================\n' +
'avg score after {:6} episodes:\n'.format(n_games) +
'avg total: ({:6.1f}/{:7.1f})\n'.format(avg_reward_total_clamped,avg_reward_total) +
'avg game1: ({:6.1f}/{:7.1f})\n'.format(avg_reward_game1_clamped,avg_reward_game1) +
'avg game2: ({:6.1f}/{:7.1f})\n'.format(avg_reward_game2_clamped,avg_reward_game2))
# Log results to files
with open(sub_dir + mode + '.txt', 'w') as fp:
fp.write('avg score after {:6} episodes:\n'.format(n_games) +
'avg total: ({:6.1f}/{:7.1f})\n'.format(avg_reward_total_clamped,avg_reward_total) +
'avg game1: ({:6.1f}/{:7.1f})\n'.format(avg_reward_game1_clamped,avg_reward_game1) +
'avg game2: ({:6.1f}/{:7.1f})\n'.format(avg_reward_game2_clamped,avg_reward_game2))
# Dump reward
with open(sub_dir + mode + '_reward_game1.pickle', 'wb') as fp:
pickle.dump(reward_history_game1, fp)
with open(sub_dir + mode + '_reward_game2.pickle', 'wb') as fp:
pickle.dump(reward_history_game2, fp)
with open(sub_dir + mode + '_reward_total.pickle', 'wb') as fp:
pickle.dump(reward_history, fp)
with open(sub_dir + mode + '_reward_clamped_game1', 'wb') as fp:
pickle.dump(reward_clamped_history_game1, fp)
with open(sub_dir + mode + '_reward_clamped_game2', 'wb') as fp:
pickle.dump(reward_clamped_history_game2, fp)
with open(sub_dir + mode + '_reward_clamped_total', 'wb') as fp:
pickle.dump(reward_clamped_history, fp)
def train(self):
"""
Train the agent
"""
num_episodes = 100000
net_updates = 0
# Logging
sub_dir = self.game1 + '+' + self.game2 + '_' + datetime.now().strftime('%Y%m%d_%H%M%S') + '/'
os.makedirs(sub_dir)
logfile = sub_dir + 'train.txt'
reward_file = sub_dir + 'reward.pickle'
reward_file_game1 = sub_dir + 'reward_game1.pickle'
reward_file_game2 = sub_dir + 'reward_game2.pickle'
reward_clamped_file = sub_dir + 'reward_clamped.pickle'
reward_clamped_file_game1 = sub_dir + 'reward_clamped_game1.pickle'
reward_clamped_file_game2 = sub_dir + 'reward_clamped_game2.pickle'
reward_clamped_file = sub_dir + 'reward_clamped.pickle'
log_avg_episodes = 50
# Total scores
best_score = 0
best_score_clamped = 0
avg_score = 0
avg_score_clamped = 0
reward_history = []
reward_clamped_history = []
# Scores game 1
avg_score_game1 = 0
avg_score_clamped_game1 = 0
reward_history_game1 = []
reward_clamped_history_game1 = []
# Scores game 2
avg_score_game2 = 0
avg_score_clamped_game2 = 0
reward_history_game2 = []
reward_clamped_history_game2 = []
# Initialize logfile with header
with open(logfile, 'w') as fp:
fp.write(datetime.now().strftime('%Y-%m-%d %H:%M:%S') + '\n' +
'Trained game (first): {}\n'.format(self.game1) +
'Trained game (second): {}\n'.format(self.game2) +
'Learning rate: {:.2E}\n'.format(self.learning_rate) +
'Batch size: {:d}\n'.format(self.batch_size) +
'Memory size(replay): {:d}\n'.format(self.mem_size) +
'Pretrained: {}\n'.format(self.pretrained_model) +
'Pretrained subnet 1: {}\n'.format(self.pretrained_subnet1) +
'Pretrained subnet 2: {}\n'.format(self.pretrained_subnet2) +
'Started training after k frames: {:d}\n'.format(self.start_train_after) +
'Optimized after k frames: {:d}\n'.format(self.optimize_each_k) +
'Target net update after k frame: {:d}\n\n'.format(self.update_target_net_each_k_steps) +
'--------+-----------+----------------------+------------' +
'----------+----------------------+--------------------\n' +
'Episode | Steps | ' +
'{:3} games avg total | '.format(log_avg_episodes) +
'{:3} games avg game1 | '.format(log_avg_episodes) +
'{:3} games avg game2 | '.format(log_avg_episodes) +
'best score total \n' +
'--------+-----------+----------------------+------------' +
'----------+----------------------+--------------------\n')
print('Started training...\nLogging to {}\n'.format(sub_dir) +
'Episode | Steps | score total | score game 1 | ' +
'score game 2 | best score total')
for i_episode in range(1,num_episodes):
# reset game at the start of each episode
screen1 = self.env1.reset()
screen2 = self.env2.reset()
# list of k last frames
last_k_frames = []
for j in range(self.num_stored_frames):
last_k_frames.append(None)
last_k_frames[j] = torch.cat((gray2pytorch(screen1),
gray2pytorch(screen2)), dim=1)
if i_episode == 1:
self.replay.pushFrame(last_k_frames[0].cpu())
# frame is saved as ByteTensor -> convert to gray value between 0 and 1
state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
# games end indicator variable
done1 = False
done2 = False
# reset score with initial lives, because every lost live adds -1
total_reward_game1 = 0
total_reward_clamped_game1 = self.env1.get_lives()
total_reward_game2 = 0
total_reward_clamped_game2 = self.env2.get_lives()
# total scores for both games
total_reward = total_reward_game1 + total_reward_game2
total_reward_clamped = total_reward_clamped_game1 + total_reward_clamped_game2
# Loop over one game
while not done1 and not done2:
self.steps +=1
action = self.select_action(state)
action1 = self.map_action(action[0,0])
action2 = action[0,0]
# perform selected action on game
screen1, reward1, reward1_clamped, done1, _ = self.env1.step(action1)
screen2, reward2, reward2_clamped, done2, _ = self.env2.step(action2)
# Logging
total_reward_game1 += int(reward1)
total_reward_game2 += int(reward2)
total_reward += int(reward1) + int(reward2)
total_reward_clamped_game1 += reward1_clamped
total_reward_clamped_game2 += reward2_clamped
total_reward_clamped += reward1_clamped + reward2_clamped
# Bake reward into tensor
reward = torch.FloatTensor([reward1_clamped+reward2_clamped])
# save latest frame, discard oldest
for j in range(self.num_stored_frames-1):
last_k_frames[j] = last_k_frames[j+1]
last_k_frames[self.num_stored_frames-1] = torch.cat((gray2pytorch(screen1),
gray2pytorch(screen2)), dim=1)
# convert frames to range 0 to 1 again
if not done1 and not done2:
next_state = torch.cat(last_k_frames,1).type(FloatTensor)/255.0
else:
next_state = None
# Store transition
self.replay.pushFrame(last_k_frames[self.num_stored_frames - 1].cpu())
self.replay.pushTransition((self.replay.getCurrentIndex()-1)%self.replay.capacity,
action, reward, done1 or done2)
# only optimize each kth step
if self.steps%self.optimize_each_k == 0:
self.optimize(net_updates)
net_updates += 1
# set current state to next state to select next action
if next_state is not None:
state = next_state
if self.use_cuda:
state = state.cuda()
# plays episode until there are no more lives left ( == done)
if done1 or done2:
break;
# Save rewards
reward_history_game1.append(total_reward_game1)
reward_history_game2.append(total_reward_game2)
reward_history.append(total_reward)
reward_clamped_history_game1.append(total_reward_clamped_game1)
reward_clamped_history_game2.append(total_reward_clamped_game2)
reward_clamped_history.append(total_reward_clamped)
# Sum up for averages
avg_score_clamped_game1 += total_reward_clamped_game1
avg_score_clamped_game2 += total_reward_clamped_game2
avg_score_clamped += total_reward_clamped
avg_score_game1 += total_reward_game1
avg_score_game2 += total_reward_game2
avg_score += total_reward
if total_reward_clamped > best_score_clamped:
best_score_clamped = total_reward_clamped
if total_reward > best_score:
best_score = total_reward
print('{:7} | '.format(i_episode) +
'{:9} | '.format(self.steps) +
'({:6.1f}/{:7.1f}) | '.format(total_reward_clamped,total_reward) +
'({:6.1f}/{:7.1f}) | '.format(total_reward_clamped_game1,total_reward_game1) +
'({:6.1f}/{:7.1f}) | '.format(total_reward_clamped_game2,total_reward_game2) +
'({:6.1f}/{:8.1f})'.format(best_score_clamped, best_score))
if i_episode % log_avg_episodes == 0 and i_episode!=0:
avg_score_clamped_game1 /= log_avg_episodes
avg_score_clamped_game2 /= log_avg_episodes
avg_score_clamped /= log_avg_episodes
avg_score_game1 /= log_avg_episodes
avg_score_game2 /= log_avg_episodes
avg_score /= log_avg_episodes
print('--------+-----------+----------------------+------------' +
'----------+----------------------+--------------------\n' +
'Episode | Steps | ' +
'{:3} games avg total | '.format(log_avg_episodes) +
'{:3} games avg game1 | '.format(log_avg_episodes) +
'{:3} games avg game2 | '.format(log_avg_episodes) +
'best score total \n' +
'{:7} | '.format(i_episode) +
'{:9} | '.format(self.steps) +
'({:6.1f}/{:7.1f}) | '.format(avg_score_clamped,avg_score) +
'({:6.1f}/{:7.1f}) | '.format(avg_score_clamped_game1,avg_score_game1) +
'({:6.1f}/{:7.1f}) | '.format(avg_score_clamped_game2,avg_score_game2) +
'({:6.1f}/{:8.1f})\n'.format(best_score_clamped, best_score) +
'\nLogging to file...\n\n'
'--------+-----------+----------------------+------------' +
'----------+----------------------+--------------------\n' +
'Episode | Steps | score total | score game 1 | ' +
'score game 2 | best score total')
# Logfile
with open(logfile, 'a') as fp:
fp.write('{:7} | '.format(i_episode) +
'{:9} | '.format(self.steps) +
'({:6.1f}/{:7.1f}) | '.format(avg_score_clamped,avg_score) +
'({:6.1f}/{:7.1f}) | '.format(avg_score_clamped_game1,avg_score_game1) +
'({:6.1f}/{:7.1f}) | '.format(avg_score_clamped_game2,avg_score_game2) +
'({:6.1f}/{:8.1f})\n'.format(best_score_clamped, best_score))
# Dump reward
with open(reward_file_game1, 'wb') as fp:
pickle.dump(reward_history_game1, fp)
with open(reward_file_game2, 'wb') as fp:
pickle.dump(reward_history_game2, fp)
with open(reward_file, 'wb') as fp:
pickle.dump(reward_history, fp)
with open(reward_clamped_file_game1, 'wb') as fp:
pickle.dump(reward_clamped_history_game1, fp)
with open(reward_clamped_file_game2, 'wb') as fp:
pickle.dump(reward_clamped_history_game2, fp)
with open(reward_clamped_file, 'wb') as fp:
pickle.dump(reward_clamped_history, fp)
avg_score_clamped_game1 = 0
avg_score_clamped_game2 = 0
avg_score_clamped = 0
avg_score_game1 = 0
avg_score_game2 = 0
avg_score = 0
if i_episode % self.save_net_each_k_episodes == 0:
with open(logfile, 'a') as fp:
fp.write('Saved model at episode ' + str(i_episode) + '...\n')
self.target_net.save(sub_dir + str(i_episode) + '_episodes.model')
print('Training done!')
self.target_net.save(sub_dir + 'final.model')
def __init__(self,
load_checkpoint,
checkpoint_file,
env,
n_states,
n_actions,
mem_size=10**6,
batch_size=256,
n_hid1=256,
n_hid2=256,
lr=3e-4,
gamma=0.99,
tau=5e-3,
reward_scale=2):
self.load_checkpoint = load_checkpoint
self.max_action = float(env.action_space.high[0])
self.low_action = float(env.action_space.low[0])
self.batch_size = batch_size
self.gamma = gamma
self.tau = tau
self.reward_scale = reward_scale
self.memory_counter = 0
self.memory = ReplayMemory(mem_size, n_states, n_actions)
self.actor = ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
self.max_action,
lr,
checkpoint_file,
name='_actor')
self.critic_1 = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_crtic1')
self.critic_2 = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_crtic2')
self.value_net = ValueNetwork(n_states,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_value')
self.target_value_net = ValueNetwork(n_states,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_value_target')
# tau=1 performs an exact copy of the networks to the respective targets
# self.update_network_parameters(tau=1)
self.update_network_parameters(self.value_net,
self.target_value_net,
tau=1)
class Agent:
def __init__(self,
load_checkpoint,
checkpoint_file,
env,
n_states,
n_actions,
mem_size=10**6,
batch_size=256,
n_hid1=256,
n_hid2=256,
lr=3e-4,
gamma=0.99,
tau=5e-3,
reward_scale=2):
self.load_checkpoint = load_checkpoint
self.max_action = float(env.action_space.high[0])
self.low_action = float(env.action_space.low[0])
self.batch_size = batch_size
self.gamma = gamma
self.tau = tau
self.reward_scale = reward_scale
self.memory_counter = 0
self.memory = ReplayMemory(mem_size, n_states, n_actions)
self.actor = ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
self.max_action,
lr,
checkpoint_file,
name='_actor')
self.critic_1 = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_crtic1')
self.critic_2 = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_crtic2')
self.value_net = ValueNetwork(n_states,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_value')
self.target_value_net = ValueNetwork(n_states,
n_hid1,
n_hid2,
lr,
checkpoint_file,
name='_value_target')
# tau=1 performs an exact copy of the networks to the respective targets
# self.update_network_parameters(tau=1)
self.update_network_parameters(self.value_net,
self.target_value_net,
tau=1)
# self.update_network_parameters_phil(tau=1)
def store_transition(self, obs, action, reward, obs_, done):
self.memory.store_transition(obs, action, reward, obs_, done)
def sample_transitions(self):
state_batch, action_batch, reward_batch, new_state_batch, done_batch = self.memory.sample_buffer(
self.batch_size)
# no need to care about the device, it is the same for all class objects (cuda or cpu is the same despite the class)
state_batch = torch.tensor(state_batch,
dtype=torch.float).to(self.actor.device)
action_batch = torch.tensor(action_batch,
dtype=torch.float).to(self.actor.device)
reward_batch = torch.tensor(reward_batch,
dtype=torch.float).to(self.actor.device)
new_state_batch = torch.tensor(new_state_batch,
dtype=torch.float).to(self.actor.device)
done_batch = torch.tensor(done_batch).to(self.actor.device)
return state_batch, action_batch, reward_batch, new_state_batch, done_batch
def update_network_parameters(self, network, target_network, tau=None):
for par, target_par in zip(network.parameters(),
target_network.parameters()):
target_par.data.copy_(tau * par.data + (1 - tau) * target_par.data)
def choose_action(self, obs):
obs = torch.tensor([obs], dtype=torch.float).to(self.actor.device)
actions, _ = self.actor.sample_normal(obs, reparametrize=False)
return actions.cpu().detach().numpy()[0]
def learn_phil(self):
if self.memory.mem_counter < self.batch_size:
return
state, action, reward, new_state, done = \
self.memory.sample_buffer(self.batch_size)
reward = torch.tensor(reward,
dtype=torch.float).to(self.critic_1.device)
done = torch.tensor(done).to(self.critic_1.device)
state_ = torch.tensor(new_state,
dtype=torch.float).to(self.critic_1.device)
state = torch.tensor(state, dtype=torch.float).to(self.critic_1.device)
action = torch.tensor(action,
dtype=torch.float).to(self.critic_1.device)
value = self.value_net(state).view(-1)
value_ = self.target_value_net(state_).view(-1)
value_[done] = 0.0
actions, log_probs = self.actor.sample_normal(state,
reparametrize=False)
# actions, log_probs = self.actor.sample_mvnormal(state, reparameterize=False)
log_probs = log_probs.view(-1)
q1_new_policy = self.critic_1.forward(state, actions)
q2_new_policy = self.critic_2.forward(state, actions)
critic_value = torch.min(q1_new_policy, q2_new_policy)
critic_value = critic_value.view(-1)
self.value_net.optimizer.zero_grad()
value_target = critic_value - log_probs
value_loss = 0.5 * (F.mse_loss(value, value_target))
value_loss.backward(retain_graph=True)
self.value_net.optimizer.step()
actions, log_probs = self.actor.sample_normal(state,
reparametrize=True)
# actions, log_probs = self.actor.sample_mvnormal(state, reparameterize=False)
log_probs = log_probs.view(-1)
q1_new_policy = self.critic_1.forward(state, actions)
q2_new_policy = self.critic_2.forward(state, actions)
critic_value = torch.min(q1_new_policy, q2_new_policy)
critic_value = critic_value.view(-1)
actor_loss = log_probs - critic_value
actor_loss = torch.mean(actor_loss)
self.actor.optimizer.zero_grad()
actor_loss.backward(retain_graph=True)
self.actor.optimizer.step()
self.critic_1.optimizer.zero_grad()
self.critic_2.optimizer.zero_grad()
q_hat = self.reward_scale * reward + self.gamma * value_
q1_old_policy = self.critic_1.forward(state, action).view(-1)
q2_old_policy = self.critic_2.forward(state, action).view(-1)
critic_1_loss = 0.5 * F.mse_loss(q1_old_policy, q_hat)
critic_2_loss = 0.5 * F.mse_loss(q2_old_policy, q_hat)
critic_loss = critic_1_loss + critic_2_loss
critic_loss.backward()
self.critic_1.optimizer.step()
self.critic_2.optimizer.step()
self.update_network_parameters(self.value_net, self.target_value_net,
self.tau)
# self.update_network_parameters_phil()
def learn(self):
if self.memory.mem_counter < self.batch_size:
return
state_batch, action_batch, reward_batch, new_state_batch, done_batch = self.sample_transitions(
)
# state_batch, action_batch, reward_batch, new_state_batch, done_batch = \
# self.memory.sample_buffer(self.batch_size)
#
# reward_batch = torch.tensor(reward_batch, dtype=torch.float).to(self.critic_1.device)
# done_batch = torch.tensor(done_batch).to(self.critic_1.device)
# new_state_batch = torch.tensor(new_state_batch, dtype=torch.float).to(self.critic_1.device)
# state_batch = torch.tensor(state_batch, dtype=torch.float).to(self.critic_1.device)
# action_batch = torch.tensor(action_batch, dtype=torch.float).to(self.critic_1.device)
'''Compute Value Network loss'''
self.value_net.optimizer.zero_grad()
val = self.value_net(state_batch).view(-1)
val_ = self.target_value_net(new_state_batch).view(-1)
val_[done_batch] = 0.0
actions, log_probs = self.actor.sample_normal(state_batch,
reparametrize=False)
log_probs = log_probs.view(-1)
q1 = self.critic_1(state_batch, actions) # action_batch)
q2 = self.critic_1(state_batch, actions) # action_batch)
q = torch.min(q1, q2).view(-1)
value_target = q - log_probs
value_loss = 0.5 * F.mse_loss(val, value_target)
value_loss.backward(retain_graph=True)
self.value_net.optimizer.step()
# val = val - q + log_prob
'''Compute Actor loss'''
self.actor.optimizer.zero_grad()
# here we need to reparametrize and thus use rsample to make the distribution differentiable
# because the log prob of the chosen action will be part of our loss.
actions, log_probs = self.actor.sample_normal(state_batch,
reparametrize=True)
log_probs = log_probs.view(-1)
q1 = self.critic_1(state_batch, actions)
q2 = self.critic_2(state_batch, actions)
q = torch.min(q1, q2).view(-1)
actor_loss = log_probs - q
actor_loss = torch.mean(actor_loss)
actor_loss.backward(retain_graph=True)
self.actor.optimizer.step()
'''Compute Critic loss'''
self.critic_1.optimizer.zero_grad()
self.critic_2.optimizer.zero_grad()
val_ = self.target_value_net(new_state_batch).view(
-1) # value for the critic update
val_[done_batch] = 0.0
q_hat = self.reward_scale * reward_batch + self.gamma * val_
q1_old_policy = self.critic_1(state_batch, action_batch).view(-1)
q2_old_policy = self.critic_2(state_batch, action_batch).view(-1)
critic_1_loss = 0.5 * F.mse_loss(q1_old_policy, q_hat)
critic_2_loss = 0.5 * F.mse_loss(q2_old_policy, q_hat)
critic_loss = critic_1_loss + critic_2_loss
critic_loss.backward()
self.critic_1.optimizer.step()
self.critic_2.optimizer.step()
self.update_network_parameters(self.value_net, self.target_value_net,
self.tau)
# self.update_network_parameters_phil()
def save_models(self):
self.actor.save_checkpoint()
self.critic_1.save_checkpoint()
self.critic_2.save_checkpoint()
self.value_net.save_checkpoint()
self.target_value_net.save_checkpoint()
def load_models(self):
self.actor.load_checkpoint()
self.critic_1.load_checkpoint()
self.critic_2.load_checkpoint()
self.value_net.load_checkpoint()
self.target_value_net.load_checkpoint()
def update_network_parameters_phil(self, tau=None):
if tau is None:
tau = self.tau
target_value_params = self.target_value_net.named_parameters()
value_params = self.value_net.named_parameters()
target_value_state_dict = dict(target_value_params)
value_state_dict = dict(value_params)
for name in value_state_dict:
value_state_dict[name] = tau*value_state_dict[name].clone() + \
(1-tau)*target_value_state_dict[name].clone()
self.target_value_net.load_state_dict(value_state_dict)
class DDPGAgent():
def __init__(self,
load_checkpoint,
n_states,
n_actions,
checkpoint_file,
mem_size=10**6,
batch_size=64,
n_hid1=400,
n_hid2=300,
alpha=1e-4,
beta=1e-3,
gamma=0.99,
tau=0.99):
self.batch_size = batch_size
self.gamma = gamma
self.tau = tau
self.actor = ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
alpha,
checkpoint_file,
name='actor')
self.critic = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
beta,
checkpoint_file,
name='critic')
self.actor_target = ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
alpha,
checkpoint_file,
name='actor_target')
self.critic_target = CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
beta,
checkpoint_file,
name='critic_target')
self.noise = OUActionNoise(mu=np.zeros(n_actions))
self.memory = ReplayMemory(mem_size, n_states, n_actions)
self.update_network_parameters_phil(tau=1)
if load_checkpoint:
self.actor.eval()
self.load_checkpoint = load_checkpoint
def reset_noise(self):
self.noise.reset()
def __copy_param(self, net_param_1, net_param_2, tau):
# a.copy_(b) reads content from b and copy it to a
for par, target_par in zip(net_param_1, net_param_2):
with torch.no_grad():
val_to_copy = tau * par.weight + (1 - tau) * target_par.weight
target_par.weight.copy_(val_to_copy)
if target_par.bias is not None:
val_to_copy = tau * par.bias + (1 - tau) * target_par.bias
target_par.bias.copy_(val_to_copy)
def update_network_parameters(self, tau=None):
# TODO: Controlla equivalenza con metodo Phil
# during the class initialization we call this method with tau=1, to perform an exact copy of the nets to targets
# then when we call this without specifying tau, we use the field stored
if tau is None:
tau = self.tau
actor_params = self.actor.children()
actor_target_params = self.actor_target.children()
self.__copy_param(actor_params, actor_target_params, tau)
critic_params = self.critic.children()
critic_target_params = self.critic_target.children()
self.__copy_param(critic_params, critic_target_params, tau)
def choose_action(self, obs):
# when using layer norm, we do not want to calculate statistics for the forward propagation. Not needed
# if using batchnorm or dropout
self.actor.eval()
obs = torch.tensor(obs, dtype=torch.float).to(self.actor.device)
# compute actions
mu = self.actor(obs)
# add some random noise for exploration
mu_prime = mu
if not self.load_checkpoint:
mu_prime = mu + torch.tensor(self.noise(), dtype=torch.float).to(
self.actor.device)
self.actor.train()
return mu_prime.cpu().detach().numpy()
def store_transitions(self, obs, action, reward, obs_, done):
self.memory.store_transition(obs, action, reward, obs_, done)
def sample_transitions(self):
state_batch, action_batch, reward_batch, new_state_batch, done_batch = self.memory.sample_buffer(
self.batch_size)
# no need to care about the device, it is the same for all class objects (cuda or cpu is the same despite the class)
state_batch = torch.tensor(state_batch,
dtype=torch.float).to(self.actor.device)
action_batch = torch.tensor(action_batch,
dtype=torch.float).to(self.actor.device)
reward_batch = torch.tensor(reward_batch,
dtype=torch.float).to(self.actor.device)
new_state_batch = torch.tensor(new_state_batch,
dtype=torch.float).to(self.actor.device)
done_batch = torch.tensor(done_batch).to(self.actor.device)
return state_batch, action_batch, reward_batch, new_state_batch, done_batch
def save_models(self):
self.actor.save_checkpoint()
self.actor_target.save_checkpoint()
self.critic.save_checkpoint()
self.critic_target.save_checkpoint()
def load_models(self):
self.actor.load_checkpoint()
self.actor_target.load_checkpoint()
self.critic.load_checkpoint()
self.critic_target.load_checkpoint()
def learn(self):
# deal with the situation in which we still not have filled the memory to batch size
if self.memory.mem_counter < self.batch_size:
return
state_batch, action_batch, reward_batch, new_state_batch, done_batch = self.sample_transitions(
)
''' compute actor_target actions and critic_target values, then use obtained values to compute target y_i '''
target_actions = self.actor_target(
new_state_batch
) # + torch.tensor(self.noise(), dtype=torch.float).to(self.actor.device)
target_critic_value_ = self.critic_target(new_state_batch,
target_actions)
# target_critic_value_next[done_batch==1] = 0.0 # if done_batch is integer valued
target_critic_value_[
done_batch] = 0.0 # if done_batch is bool -- see if it works this way
target_critic_value_ = target_critic_value_.view(
-1) # necessary for operations on matching shapes
target = reward_batch + self.gamma * target_critic_value_
target = target.view(self.batch_size, 1)
''' zero out gradients '''
self.actor.optimizer.zero_grad()
self.critic.optimizer.zero_grad()
''' compute critic loss '''
critic_value = self.critic(state_batch, action_batch)
critic_loss = F.mse_loss(target, critic_value)
''' compute actor loss'''
# cannot directly use critic value, because it is evaluating a certain (s,a) pair.
# The formula given in the paper - it appears that - wants to use critic to evaluate
# the actions produced by an updated actor, given the state
# actor_loss = torch.mean(critic_value)
actor_loss = -self.critic(state_batch, self.actor(state_batch))
actor_loss = torch.mean(actor_loss)
critic_loss.backward()
actor_loss.backward()
self.actor.optimizer.step()
self.critic.optimizer.step()
self.update_network_parameters_phil()
def __copy_params_phil(self, net_a, net_b, tau):
net_a_params = net_a.named_parameters()
net_b_params = net_b.named_parameters()
net_a_state_dict = dict(net_a_params)
net_b_state_dict = dict(net_b_params)
for name in net_a_state_dict:
net_a_state_dict[name] = tau * net_a_state_dict[name].clone() + (
1 - tau) * net_b_state_dict[name].clone()
return net_a_state_dict
def update_network_parameters_phil(self, tau=None):
if tau is None:
tau = self.tau
updated_actor_state_dict = self.__copy_params_phil(
self.actor, self.actor_target, tau)
updated_critic_state_dict = self.__copy_params_phil(
self.critic, self.critic_target, tau)
self.actor_target.load_state_dict(updated_actor_state_dict)
self.critic_target.load_state_dict(updated_critic_state_dict)
class Agent:
def __init__(self, policy_net, target_net, durability, optimizer, name,
constants):
"""An agent class that takes action on the environment and optimizes
the action based on the reward.
Parameters
----------
policy_net : DQN
[description]
target_net : DQN
[description]
durability : int
[description]
optimizer : [type]
[description]
name : str
The name of agent
constants: Constants
The hyper-parameters from Constants class
"""
self.CONSTANTS = constants
self.policy_net = policy_net
self.target_net = target_net
self.target_net.load_state_dict(policy_net.state_dict())
self.durability = durability
self.optimizer = optimizer
self.name = name
self.memory = ReplayMemory(self.CONSTANTS.MEMORY_SIZE)
self.steps_done = 0
self.total_reward = 0.0
self.reward = 0.0
self.obtained_reward = 0.0
self.n_best = 0
self.policy_net_flag = False
def select_action(self, state, is_first=False):
sample = random.random()
eps_threshold = self.CONSTANTS.EPS_END + (self.CONSTANTS.EPS_START - self.CONSTANTS.EPS_END) * \
math.exp(-1. * self.steps_done / self.CONSTANTS.EPS_DECAY)
self.steps_done += 1
if is_first:
self.writer.add_graph(self.policy_net,
input_to_model=state.to(
self.CONSTANTS.DEVICE),
profile_with_cuda=True)
if sample > eps_threshold:
with torch.no_grad():
self.policy_net_flag = True
return self.policy_net(state.to(
self.CONSTANTS.DEVICE)).max(1)[1].view(1, 1)
else:
return torch.tensor([[random.randrange(self.CONSTANTS.N_ACTIONS)]],
device=self.CONSTANTS.DEVICE,
dtype=torch.long)
def select_core_action(self, best_agent_state, flag, best_agent_action):
self.steps_done += 1
if flag:
with torch.no_grad():
if best_agent_state is None:
return self.policy_net(self.state.to(
self.CONSTANTS.DEVICE)).max(1)[1].view(1, 1)
else:
return self.policy_net(
best_agent_state.to(
self.CONSTANTS.DEVICE)).max(1)[1].view(1, 1)
else:
return best_agent_action
def optimize_model(self):
if len(self.memory) < self.CONSTANTS.BATCH_SIZE:
return
transitions = self.memory.sample(self.CONSTANTS.BATCH_SIZE)
# zip(*transitions) unzips the transitions into
# Transition(*) creates new named tuple
# batch.state - tuple of all the states (each state is a tensor)
# batch.next_state - tuple of all the next states (each state is a tensor)
# batch.reward - tuple of all the rewards (each reward is a float)
# batch.action - tuple of all the actions (each action is an int)
# Transition = ReplayMemory.get_transition()
transition = self.CONSTANTS.TRANSITION
batch = transition(*zip(*transitions))
actions = tuple(
(map(lambda a: torch.tensor([[a]], device=self.CONSTANTS.DEVICE),
batch.action)))
rewards = tuple(
(map(lambda r: torch.tensor([r], device=self.CONSTANTS.DEVICE),
batch.reward)))
non_final_mask = torch.tensor(tuple(
map(lambda s: s is not None, batch.next_state)),
device=utils.get_device(),
dtype=torch.bool)
non_final_next_states = torch.cat([
s for s in batch.next_state if s is not None
]).to(self.CONSTANTS.DEVICE)
state_batch = torch.cat(batch.state).to(self.CONSTANTS.DEVICE)
action_batch = torch.cat(actions)
reward_batch = torch.cat(rewards)
state_action_values = self.policy_net(state_batch).gather(
1, action_batch)
next_state_values = torch.zeros(self.CONSTANTS.BATCH_SIZE,
device=self.CONSTANTS.DEVICE)
next_state_values[non_final_mask] = self.target_net(
non_final_next_states).max(1)[0].detach()
expected_state_action_values = (next_state_values *
self.CONSTANTS.GAMMA) + reward_batch
loss = F.smooth_l1_loss(state_action_values,
expected_state_action_values.unsqueeze(1))
self.optimizer.zero_grad()
loss.backward()
for param in self.policy_net.parameters():
param.grad.data.clamp_(-1, 1)
self.optimizer.step()
def set_tf_writer(self, path):
self.writer = self._set_tf_writer(path)
def _set_tf_writer(self, path):
if self.name == "core":
writer = SummaryWriter(log_dir="{}/tf-board/core/".format(path))
else:
writer = SummaryWriter(
log_dir="{}/tf-board/{}".format(path, self.name))
return writer
def get_state(self):
return self.state
def get_next_state(self):
return self.next_state
def get_init_state(self):
return self.init_state
def get_name(self):
return self.name
def get_policy_net_flag(self):
return self.policy_net_flag
def set_init_state(self, state):
self.init_state = state
def set_state(self, state):
self.state = state
self.next_state = state
def set_env(self, env):
self.env = env
def get_env(self):
return self.env
def set_action(self, action):
self.action = action
def get_action(self):
return self.action
def get_durability(self):
return self.durability
def get_policy_net(self):
return self.policy_net
def reduce_durability(self, value):
self.durability = self.durability - value
def heal_durability(self, value):
self.durability = self.durability + value
def set_done_state(self, done):
self.done = done
def set_total_reward(self, reward):
self.reward = reward
if reward > 0.0:
self.obtained_reward += reward
self.total_reward += reward
def reset_total_reward(self):
self.total_reward = 0.0
self.obtained_reward = 0.0
def get_reward(self):
return self.reward
def get_obtained_reward(self):
return self.obtained_reward
def best_counter(self):
self.n_best += 1
def get_n_best(self):
return self.n_best
def get_total_reward(self):
return self.total_reward
def set_step_retrun_value(self, obs, done, info):
self.obs = obs
self.done = done
self.info = info
def is_done(self):
return self.done
class Worker():
def __init__(self, env, name, s_size, a_size, trainer, model_path,
global_episodes):
self.name = "worker_" + str(name)
self.number = name
self.model_path = model_path
self.trainer = trainer
self.global_episodes = global_episodes
self.increment = self.global_episodes.assign_add(1)
self.episode_rewards = []
self.episode_lengths = []
self.episode_mean_values = []
#Create the local copy of the network and the tensorflow op to copy global paramters to local network
self.local_Q = Q_Network(s_size, a_size, self.name, trainer)
self.update_local_ops = update_target_graph('global', self.name)
self.env = env
self.replaymemory = ReplayMemory(max_memory)
def train(self, rollout, sess, gamma, ISWeights):
rollout = np.array(rollout)
observations = rollout[:, 0]
actions = rollout[:, 1]
rewards = rollout[:, 2]
next_observations = rollout[:, 3]
dones = rollout[:, 4]
Q_target = sess.run(
self.local_Q.Q,
feed_dict={self.local_Q.inputs: np.vstack(next_observations)})
actions_ = np.argmax(Q_target, axis=1)
action = np.zeros((batch_size, a_size))
action_ = np.zeros((batch_size, a_size))
for i in range(batch_size):
action[i][actions[i]] = 1
action_[i][actions_[i]] = 1
action_now = np.zeros((batch_size, a_size, N))
action_next = np.zeros((batch_size, a_size, N))
for i in range(batch_size):
for j in range(a_size):
for k in range(N):
action_now[i][j][k] = action[i][j]
action_next[i][j][k] = action_[i][j]
q_target = sess.run(self.local_Q.q_action,
feed_dict={
self.local_Q.inputs:
np.vstack(next_observations),
self.local_Q.actions_q: action_next
})
q_target_batch = []
for i in range(len(q_target)):
qi = q_target[i] # * (1 - dones[i])
z_target_step = []
for j in range(len(qi)):
z_target_step.append(gamma * qi[j] + rewards[i])
q_target_batch.append(z_target_step)
q_target_batch = np.array(q_target_batch)
#print q_target_batch
isweight = np.zeros((batch_size, N))
for i in range(batch_size):
for j in range(N):
isweight[i, j] = ISWeights[i]
feed_dict = {
self.local_Q.inputs: np.vstack(observations),
self.local_Q.actions_q: action_now,
self.local_Q.q_target: q_target_batch,
self.local_Q.ISWeights: isweight
}
u, l, g_n, v_n, _ = sess.run([
self.local_Q.u, self.local_Q.loss, self.local_Q.grad_norms,
self.local_Q.var_norms, self.local_Q.apply_grads
],
feed_dict=feed_dict)
return l / len(rollout), g_n, v_n, Q_target, u
def work(self, gamma, sess, coord, saver):
global GLOBAL_STEP
episode_count = sess.run(self.global_episodes)
total_steps = 0
epsilon = 0.2
print("Starting worker " + str(self.number))
best_mean_episode_reward = -float('inf')
with sess.as_default(), sess.graph.as_default():
while not coord.should_stop():
sess.run(self.update_local_ops)
#episode_buffer = []
episode_reward = 0
episode_step_count = 0
d = False
s = self.env.reset()
s = process_frame(s)
if epsilon > 0.01:
epsilon = epsilon * 0.997
while not d:
#self.env.render()
GLOBAL_STEP += 1
#Take an action using probabilities from policy network output.
if random.random() > epsilon:
a_dist_list = sess.run(
self.local_Q.Q,
feed_dict={self.local_Q.inputs: [s]})
a_dist = a_dist_list[0]
a = np.argmax(a_dist)
else:
a = random.randint(0, 5)
s1, r, d, _ = self.env.step(a)
if d == False:
s1 = process_frame(s1)
else:
s1 = s
self.replaymemory.add([s, a, r, s1, d])
episode_reward += r
s = s1
total_steps += 1
episode_step_count += 1
if total_steps % 2 == 0 and d != True and total_steps > 50000:
episode_buffer, tree_idx, ISWeights = self.replaymemory.sample(
batch_size)
l, g_n, v_n, Q_target, u = self.train(
episode_buffer, sess, gamma, ISWeights)
u = np.mean(u, axis=1) + 1e-6
self.replaymemory.update_priorities(tree_idx, u)
#sess.run(self.update_local_ops)
if d == True:
break
sess.run(self.update_local_ops)
self.episode_rewards.append(episode_reward)
self.episode_lengths.append(episode_step_count)
# Periodically save gifs of episodes, model parameters, and summary statistics.
if episode_count % 5 == 0 and episode_count != 0 and total_steps > max_memory:
if self.name == 'worker_0' and episode_count % 5 == 0:
print('\n episode: ', episode_count, 'global_step:', \
GLOBAL_STEP, 'mean episode reward: ', np.mean(self.episode_rewards[-10:]), \
'epsilon: ', epsilon)
print('loss', l, 'Qtargetmean', np.mean(Q_target))
#print 'p_target', p_target
if episode_count % 100 == 0 and self.name == 'worker_0' and total_steps > 10000:
saver.save(
sess, self.model_path + '/qr-dqn-' +
str(episode_count) + '.cptk')
print("Saved Model")
mean_reward = np.mean(self.episode_rewards[-100:])
if episode_count > 20 and best_mean_episode_reward < mean_reward:
best_mean_episode_reward = mean_reward
if self.name == 'worker_0':
sess.run(self.increment)
#if episode_count%1==0:
#print('\r {} {}'.format(episode_count, episode_reward),end=' ')
episode_count += 1
class Brain:
def __init__(self, num_actions, Double, Dueling, PER):
self.num_actions = num_actions # 행동 가짓수(2)를 구함
self.Double = Double
self.Dueling = Dueling
self.PER = PER
# transition을 기억하기 위한 메모리 객체 생성
self.memory = ReplayMemory(CAPACITY)
# 신경망 구성
n_out = num_actions
self.main_q_network = Net_CNN(n_out, Dueling) # Net 클래스를 사용
self.target_q_network = Net_CNN(n_out, Dueling) # Net 클래스를 사용
print(self.main_q_network) # 신경망의 구조를 출력
# 최적화 기법을 선택
self.optimizer = optim.Adam(self.main_q_network.parameters(),
lr=0.0001)
# PER - TD 오차를 기억하기 위한 메모리 객체 생성
if self.PER == True:
self.td_error_memory = TDerrorMemory(CAPACITY)
def replay(self, episode=0):
''' Experience Replay로 신경망의 결합 가중치 학습 '''
# 1. 저장된 transition 수 확인
if len(self.memory) < BATCH_SIZE:
return
# 2. 미니배치 생성
if self.PER == True:
self.batch, self.state_batch, self.action_batch, self.reward_batch, self.non_final_next_states = self.make_minibatch(
episode)
else:
self.batch, self.state_batch, self.action_batch, self.reward_batch, self.non_final_next_states = self.make_minibatch(
)
# 3. 정답신호로 사용할 Q(s_t, a_t)를 계산
self.expected_state_action_values = self.get_expected_state_action_values(
)
# 4. 결합 가중치 수정
self.update_main_q_network()
def decide_action(self, state, episode):
'''현재 상태로부터 행동을 결정함'''
# e-greedy 알고리즘에서 서서히 최적행동의 비중을 늘린다
epsilon = 0.5 * (1 / (episode + 1))
if epsilon <= np.random.uniform(0, 1):
self.main_q_network.eval() # 신경망을 추론 모드로 전환
with torch.no_grad():
action = self.main_q_network(state).max(1)[1].view(1, 1)
# 신경망 출력의 최댓값에 대한 인덱스 = max(1)[1]
# .view(1,1)은 [torch.LongTensor of size 1]을 size 1*1로 변환하는 역할을 함
else:
# 행동을 무작위로 반환 (0 혹은 1)
action = torch.LongTensor([[random.randrange(self.num_actions)]
]) #행동을 무작위로 반환(0 혹은 1)
# action은 [torch.LongTensor of size 1*1] 형태가 된다.
return action
def make_minibatch(self, episode=0):
'''2. 미니배치 생성'''
if self.PER == True:
# 2.1 PER - 메모리 객체에서 미니배치를 추출
# def make_minibatch(self, episode):
if episode < 30:
transitions = self.memory.sample(BATCH_SIZE)
else:
# TD 오차를 이용해 미니배치를 추출하도록 수정
indexes = self.td_error_memory.get_prioritized_indexes(
BATCH_SIZE)
transitions = [self.memory.memory[n] for n in indexes]
else:
# 2.1 메모리 객체에서 미니배치를 추출
transitions = self.memory.sample(BATCH_SIZE)
# 2.2 각 변수를 미니배치에 맞는 형태로 변형
# transitions는 각 단계별로 (state, action, state_next, reward) 형태로 BATCH_SIZE 개수만큼 저장됨
# 다시 말해, (state, action, state_next, reward) * BATCH_SIZE 형태가 된다.
# 이를 미니배치로 만들기 위해
# (state*BATCH_SIZE, action*BATCH_SIZE), state_next*BATCH_SIZE, reward*BATCH_SIZE)
# 형태로 변환한다.
batch = Transition(*zip(*transitions))
# 2.3 각 변수의 요소를 미니배치에 맞게 변형하고, 신경망으로 다룰 수 있게 Variable로 만든다
# state를 예로 들면, [torch.FloatTensor of size 1*4] 형태의 요소가 BATCH_SIZE 개수만큼 있는 형태다
# 이를 torch.FloatTensor of size BATCH_SIZE*4 형태로 변형한다
# 상태, 행동, 보상, non_final 상태로 된 미니배치를 나타내는 Variable을 생성
# cat은 Concatenates(연접)를 의미한다.
state_batch = torch.cat(batch.state)
action_batch = torch.cat(batch.action)
reward_batch = torch.cat(batch.reward)
non_final_next_states = torch.cat(
[s for s in batch.next_state if s is not None])
return batch, state_batch, action_batch, reward_batch, non_final_next_states
def get_expected_state_action_values(self):
''' 정답 신호로 사용할 Q(s_t,a_t)를 계산'''
# 3.1 신경망을 추론 모드로 전환
self.main_q_network.eval()
self.target_q_network.eval()
# 3.2 신경망으로 Q(s_t, a_t)를 계산
# self.model(state_batch)은 왼쪽, 오른쪽에 대한 Q값을 출력하며
# [torch.FloatTensor of size BATCH_SIZEx2] 형태다
# 여기서부터는 실행한 행동 a_t에 대한 Q값을 계산하므로 action_batch에서 취한 행동
# a_t가 왼쪽이냐 오른쪽이냐에 대한 인덱스를 구하고, 이에 대한 Q값을 gather메서드로 모아온다.
self.state_action_values = self.main_q_network(
self.state_batch).gather(1, self.action_batch)
# 3.3 max{Q(s_t+1, a)}값을 계산한다. 이때 다음 상태가 존재하는지에 주의해야 한다
# cartpole이 done 상태가 아니고, next_state가 존재하는지 확인하는 인덱스 마스크를 만듬
non_final_mask = torch.ByteTensor(
tuple(map(lambda s: s is not None, self.batch.next_state)))
# 먼저 전체를 0으로 초기화
next_state_values = torch.zeros(BATCH_SIZE)
# Double DQN
if self.Double == True:
a_m = torch.zeros(BATCH_SIZE).type(torch.LongTensor)
# 다음 상태에서 Q값이 최대가 되는 행동 a_m을 Main Q-Network로 계산
# 마지막에 붙은 [1]로 행동에 해당하는 인덱스를 구함
a_m[non_final_mask] = self.main_q_network(
self.non_final_next_states).detach().max(1)[1]
# 다음 상태가 있는 것만을 걸러내고, size 32를 32*1로 변환
a_m_non_final_next_states = a_m[non_final_mask].view(-1, 1)
# 다음 상태가 있는 인덱스에 대해 행동 a_m의 Q값을 target Q-Network로 계산
# detach() 메서드로 값을 꺼내옴
# squeeze()메서드로 size[minibatch*1]을 [minibatch]로 변환
next_state_values[non_final_mask] = self.target_q_network(
self.non_final_next_states).gather(
1, a_m_non_final_next_states).detach().squeeze()
else:
# 다음 상태가 있는 인덱스에 대한 최대 Q값을 구한다
# 출력에 접근해서 열방향 최댓값(max(1))이 되는 [값, 인덱스]를 구한다
# 그리고 이 Q값(인덱스 = 0)을 출력한 다음
# detach 메서드로 이 값을 꺼내온다
next_state_values[non_final_mask] = self.target_q_network(
self.non_final_next_states).max(1)[0].detach()
# 3.4 정답신호로 사용할 Q(s_t, a_t) 값을 Q러닝 식으로 계산
expected_state_action_values = self.reward_batch + GAMMA * next_state_values
return expected_state_action_values
def update_main_q_network(self):
''' 4. 결합 가중치 수정 '''
# 4.1 신경망을 학습 모드로 전환
self.main_q_network.train()
# 4.2 손실함수를 계산(smooth_l1_loss는 Huber 함수)
# expected_state_action_values은 size가 [minibatch]이므로 unsqueeze해서 [minibatch*1]로 만듦
loss = F.smooth_l1_loss(self.state_action_values,
self.expected_state_action_values.unsqueeze(1))
# 4.3 결합 가중치를 수정
self.optimizer.zero_grad() # 경사를 초기화
loss.backward() # 역전파 계산
self.optimizer.step() # 결합 가중치 수정
def update_target_q_network(self): # DDQN에서 추가됨
''' Target Q-Network을 Main Q-Network와 맞춤 '''
self.target_q_network.load_state_dict(self.main_q_network.state_dict())
def update_td_error_memory(self): # Prioritized Experience Replay 에서 추가됨
''' TD 오차 메모리에 저장된 TD 오차를 업데이트 '''
# 신경망을 추론 모드로 전환
self.main_q_network.eval()
self.target_q_network.eval()
# 전체 transition으로 미니배치를 생성
transitions = self.memory.memory
batch = Transition(*zip(*transitions))
state_batch = torch.cat(batch.state)
action_batch = torch.cat(batch.action)
reward_batch = torch.cat(batch.reward)
non_final_next_states = torch.cat(
[s for s in batch.next_state if s is not None])
# 신경망의 출력 Q(s_t, a_t)를 계산
state_action_values = self.main_q_network(state_batch).gather(
1, action_batch)
# cartpole이 done 상태가 아니고, next_state가 존재하는지 확인하는 인덱스 마스크를 만듦
non_final_mask = torch.ByteTensor(
tuple(map(lambda s: s is not None, batch.next_state)))
# 먼저 전체를 0으로 초기화, 크기는 기억한 transition 개수만큼
next_state_values = torch.zeros(len(self.memory))
a_m = torch.zeros(len(self.memory)).type(torch.LongTensor)
# 다음 상태에서 Q값이 최대가 되는 행동 a_m을 Main Q-Network로 계산
# 마지막에 붙은 [1]로 행동에 해당하는 인덱스를 구함
a_m[non_final_mask] = self.main_q_network(
non_final_next_states).detach().max(1)[1]
# 다음 상태가 있는 것만을 걸러내고, size 32를 32*1 로 변환
a_m_non_final_next_states = a_m[non_final_mask].view(-1, 1)
# 다음 상태가 있는 인덱스에 대해 행동 a_m의 Q값을 target Q-Network로 계산
# detach() 메서드로 값을 꺼내옴
# squeeze() 메서드로 size[minibatch*1]을 [minibatch]로 변환
next_state_values[non_final_mask] = self.target_q_network(
non_final_next_states).gather(
1, a_m_non_final_next_states).detach().squeeze()
# TD 오차를 계산
td_errors = (reward_batch + GAMMA *
next_state_values) - state_action_values.squeeze()
# state_action_values는 size[minibatch*1]이므로 squeeze 메서드로 size[minibatch]로 변환
# TD 오차 메모리를 업데이트. Tensor를 detach() 메서드로 꺼내와 NumPy 변수로 변환하고
# 다시 파이썬 리스트로 반환
self.td_error_memory.memory = td_errors.detach().numpy().tolist()
class DDPG:
def __init__(self, dim):
self.critic_path = cst.CN_CKPT_PATH
self.actor_path = cst.AN_CKPT_PATH
self.replaymemory_path = cst.RM_PATH
self.dim_body = dim[0]
self.dim_sensor = dim[1]
self.dim_state = dim[0] + dim[1] * 3
self.dim_action = dim[2]
self.sess = tf.InteractiveSession()
self.act_lr = cst.ACT_LEARNING_RATE
self.cri_lr = cst.CRI_LEARNING_RATE
self.tau = cst.TAU
self.batch_size = cst.BATCH_SIZE
self.gamma = cst.REWARD_DECAY
self.actorNN = ActorNetwork(self.sess, self.dim_state, self.dim_action,
self.act_lr, self.tau, self.batch_size)
self.criticNN = CriticNetwork(self.sess, self.dim_state,
self.dim_action, self.cri_lr, self.tau,
self.gamma,
self.actorNN.get_num_trainable_vars())
self.sess.run(tf.global_variables_initializer())
self.actorNN.update_target_network()
self.criticNN.update_target_network()
self.rm = ReplayMemory('DDPG')
self.agent_count = cst.AGENT_COUNT
self.exploration_rate = cst.EXPLORATION_RATE
self.epsilon = cst.CRITIC_EPSILON
self.LOSS_ITERATION = cst.LOSS_ITERATION
self.expl_noise = OUNoise(self.dim_action)
self.expl = False
self.expl_decay = cst.EXPLORATION_DECAY
#=====================action===========================
def Action(self, obs, action_type, run_type):
if action_type == 'GREEDY':
return self.action_greedy(obs)
self.isExploration(run_type == 'TRAIN')
action_list = []
agent_num = len(obs['agent'])
for i in range(0, agent_num):
agent_obs = obs['agent'][i]
if np.linalg.norm(agent_obs['d'] -
agent_obs['p']) < cst.AGENT_RADIUS + 10:
action = {}
action['theta'] = 0
action['velocity'] = 0
action['stop'] = True
else:
action = self.get_action(agent_obs, run_type == 'TEST')
if self.expl:
action = self.action_random(action)
action_list.append(action)
return action_list
def action(self, obs, action_type, run_type):
if action_type == 'GREEDY':
return self.action_greedy(obs)
self.isExploration(run_type == 'TRAIN')
action_list = []
for i in range(0, self.agent_count):
agent_obs = obs['agent'][i]
if np.linalg.norm(agent_obs['d'] -
agent_obs['p']) < agent_obs['r'] + 10:
action = {}
action['theta'] = 0
action['velocity'] = 0
action['stop'] = True
else:
action = self.get_action(agent_obs, run_type == 'TEST')
if self.expl:
action = self.action_random(action)
action_list.append(action)
# for i in range(self.agent_count):
# agent_obs = obs['agent'][i]
# if np.linalg.norm(agent_obs['d']-agent_obs['p']) < agent_obs['r'] + 5:
# action = {}
# action['theta'] = 0
# action['velocity'] = 0
# action['stop'] = True
# else:
# if i == 0:
# action = self.get_action(agent_obs, run_type=='TEST')
# if self.expl:
# action = self.action_random()
# else:
# action = self.get_action_greedy(agent_obs)
# action_list.append(action)
return action_list
def get_action(self, agent_obs, action_target=False):
state_ = {}
state_ = self.preprocess(agent_obs)
state_body = np.reshape(state_['body'], (1, self.dim_body))
state_sensor = np.reshape(state_['sensor'], (1, self.dim_sensor))
if action_target:
prediction = self.actorNN.predict_target(state_body, state_sensor)
else:
prediction = self.actorNN.predict(state_body, state_sensor)
action = {}
action['theta'] = prediction[0][0]
action['velocity'] = prediction[0][1]
action['stop'] = False
return action
def action_greedy(self, obs):
action_list = []
agent_num = len(obs['agent'])
for i in range(agent_num):
agent_obs = obs['agent'][i]
action = self.get_action_greedy(agent_obs)
action_list.append(action)
return action_list
def get_action_greedy(self, agent_obs):
if np.linalg.norm(agent_obs['d'] - agent_obs['p']) < 10 + 10:
action = {}
action['theta'] = 0
action['velocity'] = 0
action['stop'] = True
return action
greedy_dis = None
angle_num = 20
next_angle = (190 / 2.0)
offset = 2
direction = np.array(agent_obs['d']) - np.array(agent_obs['p'])
direction /= np.linalg.norm(direction)
greedy_dir = 0
if random.random() < 0.5:
greedy_dir = 1
for angle in range(angle_num):
if agent_obs['d_map'][angle] < 10 + offset:
continue
curr_angle = 190 / 2 - angle * 10
curr_q = mMath.AngleToCoor(
curr_angle + agent_obs['front']) * agent_obs['d_map'][angle]
curr_dis = direction[0] * curr_q[0] + direction[1] * curr_q[1]
if greedy_dir == 0:
if (greedy_dis is None) or (greedy_dis < curr_dis):
next_angle = curr_angle
greedy_dis = curr_dis
next_q = curr_q
else:
if (greedy_dis is None) or (greedy_dis <= curr_dis):
next_angle = curr_angle
greedy_dis = curr_dis
next_q = curr_q
action = {}
action['theta'] = np.clip(next_angle, -10, 10) / 10.0
if greedy_dis is None:
action['velocity'] = -1
else:
action['velocity'] = 1
action['stop'] = False
return action
def action_random(self, action=None):
if action is None:
action = dict()
action['theta'] = np.random.normal()
action['velocity'] = np.random.normal()
else:
noise_theta, noise_vel = self.expl_noise.noise()
action['theta'] = action['theta'] + noise_theta
action['velocity'] = action['velocity'] + noise_vel
action['stop'] = False
return action
#=====================update==========================
def Update(self):
if len(self.rm.memory['critic']) > 0 and len(
self.rm.memory['actor']) > 0:
self.update_network()
def update_network(self):
rm_critic_batch = self.rm.getRandomMemories('critic')
s_body_batch, s_sensor_batch, a_batch, r_batch, t_batch, s2_body_batch, s2_sensor_batch = [], [], [], [], [], [], []
for m in rm_critic_batch:
state_ = copy.copy(self.preprocess(m['state']['agent'][0]))
state_body = copy.copy(state_['body'])
state_sensor = copy.copy(state_['sensor'])
action = copy.copy(
np.array([m['action'][0]['theta'],
m['action'][0]['velocity']]))
next_state_ = copy.copy(
self.preprocess(m['next_state']['agent'][0]))
next_state_body = copy.copy(next_state_['body'])
next_state_sensor = copy.copy(next_state_['sensor'])
s_body_batch.append(state_body[0])
s_sensor_batch.append(state_sensor[0])
a_batch.append(action)
r_batch.append(m['reward'])
t_batch.append(m['term'])
s2_body_batch.append(next_state_body[0])
s2_sensor_batch.append(next_state_sensor[0])
target_q = self.criticNN.predict_target(
s2_body_batch, s2_sensor_batch,
self.actorNN.predict_target(s2_body_batch, s2_sensor_batch))
y_i = []
c_batch_size = len(rm_critic_batch)
for k in range(c_batch_size):
if t_batch[k]:
y_i.append(r_batch[k])
else:
y_i.append(r_batch[k] + self.gamma * target_q[k])
# Update the critic given the targets
predicted_q_value, _ = self.criticNN.train(
s_body_batch, s_sensor_batch, a_batch,
np.reshape(y_i, (int(c_batch_size), 1)))
# Update the actor policy using the sampled gradient
rm_actor_batch = self.rm.getRandomMemories('actor')
actor_body_batch, actor_sensor_batch, actor_a_batch = [], [], []
for m in rm_actor_batch:
state_ = copy.copy(self.preprocess(m['state']['agent'][0]))
state_body = copy.copy(state_['body'])
state_sensor = copy.copy(state_['sensor'])
action = copy.copy(
np.array([m['action'][0]['theta'],
m['action'][0]['velocity']]))
actor_body_batch.append(state_body[0])
actor_sensor_batch.append(state_sensor[0])
actor_a_batch.append(action)
act_batch = self.actorNN.predict(actor_body_batch, actor_sensor_batch)
grads = self.criticNN.action_gradients(actor_body_batch,
actor_sensor_batch, act_batch)
self.actorNN.train(actor_body_batch, actor_sensor_batch, grads[0])
# Update target networks
self.actorNN.update_target_network()
self.criticNN.update_target_network()
#===================evaluate===========================
def evaluate(self, obs, agent_idx, action, run_type='TRAIN'):
state_ = {}
agent_obs = obs['agent'][agent_idx]
state_['body'] = np.array(
self.preprocess_body(agent_obs['p'], agent_obs['q'],
agent_obs['v'], agent_obs['d']))
state_['action'] = np.array([action['theta'], action['velocity']])
state_['sensor'] = np.array(
self.preprocess_sensor(agent_obs['d_map'], agent_obs['v_map'],
agent_obs['q_lim'], agent_obs['v_depth']))
state_body = np.reshape(state_['body'], (1, self.dim_body))
state_sensor = np.reshape(state_['sensor'], (1, self.dim_sensor))
action = np.reshape(state_['action'], (1, self.dim_action))
if run_type == 'TEST':
prediction = self.criticNN.predict_target(state_body, state_sensor,
action)[0]
else:
prediction = self.criticNN.predict(state_body, state_sensor,
action)[0]
return prediction
def expl_rate_decay(self):
if self.exploration_rate > 0.2:
self.exploration_rate *= self.expl_decay
print "exploration rate : ", self.exploration_rate
#=====================replay_memory===========================
def addMemory(self, is_greedy, obs, act, next_state, reward, is_term):
if is_greedy:
self.rm.addMemory('actor', obs, act, next_state, reward, is_term)
self.rm.addMemory('critic', obs, act, next_state, reward, is_term)
else:
if self.expl:
self.rm.addMemory('actor', obs, act, next_state, reward,
is_term)
self.expl = False
else:
self.rm.addMemory('critic', obs, act, next_state, reward,
is_term)
#==================save & load==========================
def save(self, m_replay=False, training_time=0, eval_list=None):
cur_time = strftime("%Y%m%d_%I%M.ckpt", localtime())
print "Save Critic Network : ",
self.criticNN.save(self.critic_path, cur_time)
print "Save Actor Network : ",
self.actorNN.save(self.actor_path, cur_time)
print "Parameters Saved...!"
self.save_parameters(cur_time, training_time)
print "Networks Saved...!"
if m_replay:
print "Replay Memories Saved...!"
self.save_replaymemory(cur_time)
if eval_list != None:
print "Evaluation List Saved...!"
self.save_evaluation(cur_time, eval_list)
def save_replaymemory(self, cur_time):
f = open(cst.RM_PATH + "checkpoint", 'w')
f.write(cur_time)
f.close()
f = open(cst.RM_PATH + "rm_" + cur_time, 'w')
pickle.dump(self.rm, f, protocol=pickle.HIGHEST_PROTOCOL)
f.close()
def save_evaluation(self, cur_time, eval_list=None):
f = open(cst.EVAL_PATH + "checkpoint", 'w')
f.write(cur_time)
f.close()
f = open(cst.EVAL_PATH + "eval_" + cur_time, 'w')
pickle.dump(eval_list, f, protocol=pickle.HIGHEST_PROTOCOL)
f.close()
def save_parameters(self, cur_time, training_time):
f_read = open(cst.PM_READ_PATH, 'r')
f_write = open(cst.PM_WRITE_PATH + "pm_" + cur_time + ".txt", 'w')
f_write.write("traning time : " + str(training_time))
while True:
line = f_read.readline()
if not line:
break
f_write.write(line)
f_read.close()
f_write.close()
def load_network(self, type):
if type == 'actor':
print "Load Recent Actor Network : ",
self.actorNN.load(self.actor_path)
elif type == 'critic':
print "Load Recent Critic Network : ",
self.criticNN.load(self.critic_path)
def load_memory(self):
f = open(cst.RM_PATH + "checkpoint", 'r')
recent_file_name = f.readline()
f.close()
f_rm = open(cst.RM_PATH + "rm_" + recent_file_name, 'r')
self.rm = pickle.load(f_rm)
f_rm.close()
print "Load Replay Memory : ", cst.RM_PATH, "rm_", recent_file_name
def load_eval(self):
f = open(cst.EVAL_PATH + "checkpoint", 'r')
recent_file_name = f.readline()
f.close()
f_eval = open(cst.EVAL_PATH + "eval_" + recent_file_name, 'r')
self.eval = pickle.load(f_eval)
f_eval.close()
print "Load Eval List : ", cst.EVAL_PATH, "eval_", recent_file_name
#=================other===============================
def preprocess(self, agent_obs):
state = {}
state['body'] = np.array(
self.preprocess_body(agent_obs['p'], agent_obs['q'],
agent_obs['v'], agent_obs['d'])).reshape(
(1, self.dim_body))
state['sensor'] = np.array(
self.preprocess_sensor(agent_obs['d_map'], agent_obs['delta'], 20,
cst.VISION_DEPTH)).reshape((1, 40))
return state
def preprocess_body(self, p, q, v, d):
p_ = np.array(p)
q_ = np.array(q)
d_ = np.array(d)
width = cst.WINDOW_WIDTH / 2.0
height = cst.WINDOW_HEIGHT / 2.0
p_[0] = p_[0] / width
p_[1] = p_[1] / height
d_[0] = d_[0] / width
d_[1] = d_[1] / height
q_norm = np.linalg.norm(q_)
q_ = (q_ / q_norm)
pd = np.array(d_ - p_)
pd_len = np.linalg.norm(pd)
pd_vec = pd / pd_len
inner = mMath.InnerProduct(q_, pd_vec)
cross = mMath.CrossProduct(q_, pd_vec)
cross_val = 1.0
if cross < 0:
cross_val = 0.0
return [v, inner, cross_val, pd_len]
def preprocess_sensor(self, d_map, delta_map, q_lim, vision_depth):
depth = [d / float(vision_depth) for d in d_map]
delta = [d / float(vision_depth) for d in delta_map]
# print "depth : ", depth
# print "delta : ", delta
sensor = depth + delta
return np.array(sensor)
def get_agent_count(self, is_train, obs):
if is_train:
return 1
else:
return len(obs['agent'])
def isExploration(self, flag):
self.expl = (flag and random.random() < self.exploration_rate)
def __init__(self,
game,
mem_size = 1000000,
state_buffer_size = 4,
batch_size = 64,
learning_rate = 1e-5,
pretrained_model = None,
frameskip = 4
):
"""
Inputs:
- game: string to select the game
- mem_size: int length of the replay memory
- state_buffer_size: int number of recent frames used as input for neural network
- batch_size: int
- learning_rate: float
- pretrained_model: str path to the model
- record: boolean to enable record option
"""
# Namestring
self.game = game
# Environment
self.env = Environment(game_name[game], dimensions[game], frameskip=frameskip)
# Cuda
self.use_cuda = torch.cuda.is_available()
# Neural network
self.net = DQN(channels_in = state_buffer_size,
num_actions = self.env.get_number_of_actions())
self.target_net = DQN(channels_in = state_buffer_size,
num_actions = self.env.get_number_of_actions())
if self.use_cuda:
self.net.cuda()
self.target_net.cuda()
if pretrained_model:
self.net.load(pretrained_model)
self.target_net.load(pretrained_model)
self.pretrained_model = True
else:
self.pretrained_model = False
# Optimizer
self.learning_rate = learning_rate
self.optimizer = optim.Adam(self.net.parameters(), lr=learning_rate)
#self.optimizer = optim.RMSprop(self.net.parameters(), lr=learning_rate,alpha=0.95, eps=0.01)
self.batch_size = batch_size
self.optimize_each_k = 1
self.update_target_net_each_k_steps = 10000
self.noops_count = 0
# Replay Memory (Long term memory)
self.replay = ReplayMemory(capacity=mem_size, num_history_frames=state_buffer_size)
self.mem_size = mem_size
# Fill replay memory before training
if not self.pretrained_model:
self.start_train_after = 50000
else:
self.start_train_after = mem_size//2
# Buffer for the most recent states (Short term memory)
self.num_stored_frames = state_buffer_size
# Steps
self.steps = 0
# Save net
self.save_net_each_k_episodes = 500
class Agent():
def __init__(self, game, agent_type, display, load_model, record, test):
self.name = game
self.agent_type = agent_type
self.ale = ALEInterface()
self.ale.setInt(str.encode('random_seed'), np.random.randint(100))
self.ale.setBool(str.encode('display_screen'), display or record)
if record:
self.ale.setString(str.encode('record_screen_dir'), str.encode('./data/recordings/{}/{}/tmp/'.format(game, agent_type)))
self.ale.loadROM(str.encode('./roms/{}.bin'.format(self.name)))
self.action_list = list(self.ale.getMinimalActionSet())
self.frame_shape = np.squeeze(self.ale.getScreenGrayscale()).shape
if test:
self.name += '_test'
if 'space_invaders' in self.name:
# Account for blinking bullets
self.frameskip = 2
else:
self.frameskip = 3
self.frame_buffer = deque(maxlen=4)
if load_model and not record:
self.load_replaymemory()
else:
self.replay_memory = ReplayMemory(500000, 32)
model_input_shape = self.frame_shape + (4,)
model_output_shape = len(self.action_list)
if agent_type == 'dqn':
self.model = DeepQN(
model_input_shape,
model_output_shape,
self.action_list,
self.replay_memory,
self.name,
load_model
)
elif agent_type == 'double':
self.model = DoubleDQN(
model_input_shape,
model_output_shape,
self.action_list,
self.replay_memory,
self.name,
load_model
)
else:
self.model = DuelingDQN(
model_input_shape,
model_output_shape,
self.action_list,
self.replay_memory,
self.name,
load_model
)
print('{} Loaded!'.format(' '.join(self.name.split('_')).title()))
print('Displaying: ', display)
print('Frame Shape: ', self.frame_shape)
print('Frame Skip: ', self.frameskip)
print('Action Set: ', self.action_list)
print('Model Input Shape: ', model_input_shape)
print('Model Output Shape: ', model_output_shape)
print('Agent: ', agent_type)
def training(self, steps):
'''
Trains the agent for :steps number of weight updates.
Returns the average model loss
'''
loss = []
# Initialize frame buffer. np.squeeze removes empty dimensions e.g. if shape=(210,160,__)
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
try:
for step in range(steps):
gameover = False
initial_state = np.stack(self.frame_buffer, axis=-1)
action = self.model.predict_action(initial_state)
# Backup data
if step % 5000 == 0:
self.model.save_model()
self.model.save_hyperparams()
self.save_replaymemory()
# If using a target model check for weight updates
if hasattr(self.model, 'tau'):
if self.model.tau == 0:
self.model.update_target_model()
self.model.tau = 10000
else:
self.model.tau -= 1
# Frame skipping technique https://danieltakeshi.github.io/2016/11/25/frame-skipping-and-preprocessing-for-deep-q-networks-on-atari-2600-games/
lives_before = self.ale.lives()
for _ in range(self.frameskip):
self.ale.act(action)
reward = self.ale.act(action)
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
lives_after = self.ale.lives()
if lives_after < lives_before:
gameover = True # Taking advice from dude on reddit
reward = -1
if self.ale.game_over():
gameover = True
reward = -1
self.ale.reset_game()
new_state = np.stack(self.frame_buffer, axis=-1)
# Experiment with clipping rewards for stability purposes
reward = np.clip(reward, -1, 1)
self.replay_memory.add(
initial_state,
action,
reward,
gameover,
new_state
)
loss += self.model.replay_train()
except:
self.model.save_model()
self.model.save_hyperparams()
self.save_replaymemory()
raise KeyboardInterrupt
return np.mean(loss, axis=0)
def simulate_random(self):
print('Simulating game randomly')
done = False
total_reward = 0
while not done:
action = np.random.choice(self.ale.getMinimalActionSet())
reward = self.ale.act(action)
total_reward += reward
if self.ale.game_over():
reward = -1
done = True
reward = np.clip(reward, -1, 1)
if reward != 0:
print(reward)
frames_survived = self.ale.getEpisodeFrameNumber()
self.ale.reset_game()
return total_reward, frames_survived
def simulate_intelligent(self, evaluating=False):
done = False
total_score = 0
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
while not done:
state = np.stack(self.frame_buffer, axis=-1)
action = self.model.predict_action(state, evaluating)
for _ in range(self.frameskip):
self.ale.act(action)
# Remember, ale.act returns the increase in game score with this action
total_score += self.ale.act(action)
# Pushes oldest frame out
self.frame_buffer.append(np.squeeze(self.ale.getScreenGrayscale()))
if self.ale.game_over():
done = True
frames_survived = self.ale.getEpisodeFrameNumber()
print(' Game Over')
print(' Frames Survived: ', frames_survived)
print(' Score: ', total_score)
print('===========================')
self.ale.reset_game()
return total_score, frames_survived
def save_replaymemory(self):
with bz2.BZ2File('./data/{}/{}_replaymem.obj'.format(self.agent_type, self.name), 'wb') as f:
pickle.dump(self.replay_memory, f, protocol=pickle.HIGHEST_PROTOCOL)
print('Saved replay memory at ', datetime.now())
def load_replaymemory(self):
try:
with bz2.BZ2File('./data/{}/{}_replaymem.obj'.format(self.agent_type, self.name), 'rb') as f:
self.replay_memory = pickle.load(f)
print('Loaded replay memory at ', datetime.now())
except FileNotFoundError:
print('No replay memory file found')
raise KeyboardInterrupt
class Agent():
def __init__(self,
load_checkpoint,
checkpoint_file,
env,
n_states,
n_actions,
update_actor_interval=2,
warmup=1000,
mem_size=10**6,
batch_size=100,
n_hid1=400,
n_hid2=300,
lr_alpha=1e-3,
lr_beta=1e-3,
gamma=0.99,
tau=5e-3,
noise_mean=0,
noise_sigma=0.1):
self.load_checkpoint = load_checkpoint
self.checkpoint_file = checkpoint_file
# needed for clamping in the learn function
self.env = env
self.max_action = float(env.action_space.high[0])
self.low_action = float(env.action_space.low[0])
self.n_actions = n_actions
# to keep track of how often we call "learn" function, for the actor network
self.learn_step_counter = 0
# to handle countdown to the end of the warmup period, incremented every time we call an action
self.time_step = 0
self.update_actor_interval = update_actor_interval
self.warmup = warmup
self.gamma = gamma
self.tau = tau
self.batch_size = batch_size
self.noise_mean = noise_mean
self.noise_sigma = noise_sigma
self.actor = TD3ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_alpha,
checkpoint_file,
name='actor')
self.target_actor = TD3ActorNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_alpha,
checkpoint_file,
name='target_actor')
self.critic_1 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='critic_1')
self.critic_2 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='critic_2')
self.target_critic_1 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='target_critic_1')
self.target_critic_2 = TD3CriticNetwork(n_states,
n_actions,
n_hid1,
n_hid2,
lr_beta,
checkpoint_file,
name='target_critic_2')
self.memory = ReplayMemory(mem_size, n_states, n_actions)
# tau=1 perform an exact copy of the networks to the respective targets
# self.update_network_parameters(tau=1)
self.update_network_parameters(self.actor, self.target_actor, tau=1)
self.update_network_parameters(self.critic_1,
self.target_critic_1,
tau=1)
self.update_network_parameters(self.critic_2,
self.target_critic_2,
tau=1)
def choose_action(self, obs):
if self.time_step < self.warmup:
self.time_step += 1
action = torch.tensor(self.env.action_space.sample())
else:
obs = torch.tensor(obs, dtype=torch.float).to(self.actor.device)
action = self.actor(obs)
# exploratory noise, scaled wrt action scale (max_action)
noise = torch.tensor(
np.random.normal(self.noise_mean,
self.noise_sigma * self.max_action,
size=self.n_actions)).to(self.actor.device)
action += noise
action = torch.clamp(action, self.low_action, self.max_action)
return action.cpu().detach().numpy()
def choose_action_eval(self, obs):
obs = torch.tensor(obs, dtype=torch.float).to(self.actor.device)
action = self.actor(obs)
action = torch.clamp(action, self.low_action, self.max_action)
return action.cpu().detach().numpy()
def store_transition(self, obs, action, reward, obs_, done):
self.memory.store_transition(obs, action, reward, obs_, done)
def sample_transitions(self):
state_batch, action_batch, reward_batch, new_state_batch, done_batch = self.memory.sample_buffer(
self.batch_size)
# no need to care about the device, it is the same for all class objects (cuda or cpu is the same despite the class)
state_batch = torch.tensor(state_batch,
dtype=torch.float).to(self.actor.device)
action_batch = torch.tensor(action_batch,
dtype=torch.float).to(self.actor.device)
reward_batch = torch.tensor(reward_batch,
dtype=torch.float).to(self.actor.device)
new_state_batch = torch.tensor(new_state_batch,
dtype=torch.float).to(self.actor.device)
done_batch = torch.tensor(done_batch).to(self.actor.device)
return state_batch, action_batch, reward_batch, new_state_batch, done_batch
def __copy_param(self, net_param_1, net_param_2, tau):
# a.copy_(b) reads content from b and copy it to a
for par, target_par in zip(net_param_1, net_param_2):
#with torch.no_grad():
val_to_copy = tau * par.weight + (1 - tau) * target_par.weight
target_par.weight.copy_(val_to_copy)
if target_par.bias is not None:
val_to_copy = tau * par.bias + (1 - tau) * target_par.bias
target_par.bias.copy_(val_to_copy)
def update_network_parameters(self, network, target_network, tau=None):
for par, target_par in zip(network.parameters(),
target_network.parameters()):
target_par.data.copy_(tau * par.data + (1 - tau) * target_par.data)
#
# # TODO: Controlla equivalenza con metodo Phil
# # during the class initialization we call this method with tau=1, to perform an exact copy of the nets to targets
# # then when we call this without specifying tau, we use the field stored
# if tau is None:
# tau = self.tau
#
# actor_params = self.actor.children()
# target_actor_params = self.target_actor.children()
# self.__copy_param(actor_params, target_actor_params, tau)
#
# critic_params1 = self.critic_1.children()
# target_critic_1_params = self.target_critic_1.children()
# self.__copy_param(critic_params1, target_critic_1_params, tau)
#
# critic_params2 = self.critic_2.children()
# target_critic_2_params = self.target_critic_2.children()
# self.__copy_param(critic_params2, target_critic_2_params, tau)
def learn(self):
self.learn_step_counter += 1
# deal with the situation in which we still not have filled the memory to batch size
if self.memory.mem_counter < self.batch_size:
return
state_batch, action_batch, reward_batch, new_state_batch, done_batch = self.sample_transitions(
)
# +- 0.5 as per paper. To be tested if min and max actions are not equal (e.g. -2 and 1)
noise = torch.tensor(
np.clip(
np.random.normal(self.noise_mean, 0.2, size=self.n_actions),
-0.5, 0.5)).to(self.actor.device)
target_next_action = torch.clamp(
self.target_actor(new_state_batch) + noise, self.low_action,
self.max_action)
target_q1_ = self.target_critic_1(new_state_batch, target_next_action)
target_q2_ = self.target_critic_1(new_state_batch, target_next_action)
target_q_ = torch.min(
target_q1_,
target_q2_) # take the min q_vale for every element in the batch
target_q_[done_batch] = 0.0
target = target_q_.view(-1) # probably not needed
target = reward_batch + self.gamma * target #_q
target = target.view(self.batch_size, 1) # probably not needed
q_val1 = self.critic_1(state_batch, action_batch)
q_val2 = self.critic_1(state_batch, action_batch)
critic_loss1 = F.mse_loss(q_val1, target)
critic_loss2 = F.mse_loss(q_val2, target)
critic_loss = critic_loss1 + critic_loss2
self.critic_1.optimizer.zero_grad()
self.critic_2.optimizer.zero_grad()
critic_loss.backward()
#critic_loss1.backward()
#critic_loss2.backward()
self.critic_1.optimizer.step()
self.critic_2.optimizer.step()
if self.learn_step_counter % self.update_actor_interval:
action = self.actor(state_batch)
# compute actor loss proportional to the estimated value from q1 given state, action pairs, where the action
# is recomputed using the new policy
actor_loss = -torch.mean(self.critic_1(state_batch, action))
self.actor.optimizer.zero_grad()
actor_loss.backward()
self.actor.optimizer.step()
self.update_network_parameters(self.actor, self.target_actor,
self.tau)
self.update_network_parameters(self.critic_1, self.target_critic_1,
self.tau)
self.update_network_parameters(self.critic_2, self.target_critic_2,
self.tau)
def save_models(self):
self.actor.save_checkpoint()
self.target_actor.save_checkpoint()
self.critic_1.save_checkpoint()
self.critic_2.save_checkpoint()
self.target_critic_1.save_checkpoint()
self.target_critic_2.save_checkpoint()
def load_models(self):
self.actor.load_checkpoint()
self.target_actor.load_checkpoint()
self.critic_1.load_checkpoint()
self.critic_2.load_checkpoint()
self.target_critic_1.load_checkpoint()
self.target_critic_2.load_checkpoint()
def __init__(self, game, agent_type, display, load_model, record, test):
self.name = game
self.agent_type = agent_type
self.ale = ALEInterface()
self.ale.setInt(str.encode('random_seed'), np.random.randint(100))
self.ale.setBool(str.encode('display_screen'), display or record)
if record:
self.ale.setString(str.encode('record_screen_dir'), str.encode('./data/recordings/{}/{}/tmp/'.format(game, agent_type)))
self.ale.loadROM(str.encode('./roms/{}.bin'.format(self.name)))
self.action_list = list(self.ale.getMinimalActionSet())
self.frame_shape = np.squeeze(self.ale.getScreenGrayscale()).shape
if test:
self.name += '_test'
if 'space_invaders' in self.name:
# Account for blinking bullets
self.frameskip = 2
else:
self.frameskip = 3
self.frame_buffer = deque(maxlen=4)
if load_model and not record:
self.load_replaymemory()
else:
self.replay_memory = ReplayMemory(500000, 32)
model_input_shape = self.frame_shape + (4,)
model_output_shape = len(self.action_list)
if agent_type == 'dqn':
self.model = DeepQN(
model_input_shape,
model_output_shape,
self.action_list,
self.replay_memory,
self.name,
load_model
)
elif agent_type == 'double':
self.model = DoubleDQN(
model_input_shape,
model_output_shape,
self.action_list,
self.replay_memory,
self.name,
load_model
)
else:
self.model = DuelingDQN(
model_input_shape,
model_output_shape,
self.action_list,
self.replay_memory,
self.name,
load_model
)
print('{} Loaded!'.format(' '.join(self.name.split('_')).title()))
print('Displaying: ', display)
print('Frame Shape: ', self.frame_shape)
print('Frame Skip: ', self.frameskip)
print('Action Set: ', self.action_list)
print('Model Input Shape: ', model_input_shape)
print('Model Output Shape: ', model_output_shape)
print('Agent: ', agent_type)
class Learner():
def __init__(self, sess, s_size, a_size, scope, queues, trainer):
self.queue = queues[0]
self.param_queue = queues[1]
self.replaymemory = ReplayMemory(100000)
self.sess = sess
self.learner_net = network(s_size, a_size, scope, 20)
self.q = self.learner_net.q
self.Q = self.learner_net.Q
self.actions_q = tf.placeholder(shape=[None, a_size, N],
dtype=tf.float32)
self.q_target = tf.placeholder(shape=[None, N], dtype=tf.float32)
self.ISWeights = tf.placeholder(shape=[None, N], dtype=tf.float32)
self.q_actiona = tf.multiply(self.q, self.actions_q)
self.q_action = tf.reduce_sum(self.q_actiona, axis=1)
self.u = tf.abs(self.q_target - self.q_action)
self.loss = tf.reduce_mean(
tf.reduce_sum(tf.square(self.u) * self.ISWeights, axis=1))
self.local_vars = self.learner_net.local_vars #tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, scope)
self.gradients = tf.gradients(self.loss, self.local_vars)
#grads,self.grad_norms = tf.clip_by_norm(self.gradients,40.0)
self.apply_grads = trainer.apply_gradients(
zip(self.gradients, self.local_vars))
self.sess.run(tf.global_variables_initializer())
def run(self, gamma, s_size, a_size, batch_size, env):
print('start learning')
step, train1 = 0, False
epi_q = []
self.env = env
while True:
if self.queue.empty():
pass
else:
while not self.queue.empty():
t_error = self.queue.get()
step += 1
self.replaymemory.add(t_error)
if self.param_queue.empty():
params = self.sess.run(self.local_vars)
self.param_queue.put(params)
if step >= 10000:
train1 = True
step = 0
if train1 == True:
episode_buffer, tree_idx, ISWeights = self.replaymemory.sample(
batch_size)
#print 'fadsfdasfadsfa'
episode_buffer = np.array(episode_buffer)
#print episode_buffer
observations = episode_buffer[:, 0]
actions = episode_buffer[:, 1]
rewards = episode_buffer[:, 2]
observations_next = episode_buffer[:, 3]
dones = episode_buffer[:, 4]
Q_target = self.sess.run(self.Q,
feed_dict={
self.learner_net.inputs:
np.vstack(observations_next)
})
actions_ = np.argmax(Q_target, axis=1)
action = np.zeros((batch_size, a_size))
action_ = np.zeros((batch_size, a_size))
for i in range(batch_size):
action[i][actions[i]] = 1
action_[i][actions_[i]] = 1
action_now = np.zeros((batch_size, a_size, N))
action_next = np.zeros((batch_size, a_size, N))
for i in range(batch_size):
for j in range(a_size):
for k in range(N):
action_now[i][j][k] = action[i][j]
action_next[i][j][k] = action_[i][j]
q_target = self.sess.run(self.q_action,
feed_dict={
self.learner_net.inputs:
np.vstack(observations_next),
self.actions_q:
action_next
})
q_target_batch = []
for i in range(len(q_target)):
qi = q_target[i]
z_target_step = []
for j in range(len(qi)):
z_target_step.append(gamma * qi[j] * (1 - dones[i]) +
rewards[i])
q_target_batch.append(z_target_step)
q_target_batch = np.array(q_target_batch)
isweight = np.zeros((batch_size, N))
for i in range(batch_size):
for j in range(N):
isweight[i, j] = ISWeights[i]
feed_dict = {
self.q_target: q_target_batch,
self.learner_net.inputs: np.vstack(observations),
self.actions_q: action_now,
self.ISWeights: isweight
}
l, abs_errors, _ = self.sess.run(
[self.loss, self.u, self.apply_grads], feed_dict=feed_dict)
#print abs_errors
abs_errors = np.mean(abs_errors, axis=1) + 1e-6
self.replaymemory.update_priorities(tree_idx, abs_errors)
class Worker():
def __init__(self,env,name,s_size,a_size,trainer,model_path,global_episodes):
self.name = "worker_" + str(name)
self.number = name
self.model_path = model_path
self.trainer = trainer
self.global_episodes = global_episodes
self.increment = self.global_episodes.assign_add(1)
self.episode_rewards = []
self.episode_lengths = []
self.episode_mean_values = []
#Create the local copy of the network and the tensorflow op to copy global paramters to local network
self.local_Q = Q_Network(s_size, a_size, self.name, trainer)
self.update_local_ops = update_target_graph('global', self.name)
self.env = env
self.replaymemory = ReplayMemory(max_memory)
def train(self,rollout,sess,gamma,ISWeights):
rollout = np.array(rollout)
observations = rollout[:,0]
actions = rollout[:,1]
rewards = rollout[:,2]
next_observations = rollout[:,3]
dones = rollout[:,4]
Q_target = sess.run(self.local_Q.Q, feed_dict={self.local_Q.inputs:np.vstack(next_observations)})
actions_ = np.argmax(Q_target, axis=1)
action = np.zeros((batch_size, a_size))
action_ = np.zeros((batch_size, a_size))
for i in range(batch_size):
action[i][actions[i]] = 1
action_[i][actions_[i]] = 1
action_now = np.zeros((batch_size, a_size, N))
action_next = np.zeros((batch_size, a_size, N))
for i in range(batch_size):
for j in range(a_size):
for k in range(N):
action_now[i][j][k] = action[i][j]
action_next[i][j][k] = action_[i][j]
q_target = sess.run(self.local_Q.q_action, feed_dict={self.local_Q.inputs:np.vstack(next_observations),
self.local_Q.actions_q:action_next})
q_target_batch = []
for i in range(len(q_target)):
qi = q_target[i]# * (1 - dones[i])
z_target_step = []
for j in range(len(qi)):
z_target_step.append(gamma * qi[j] + rewards[i])
q_target_batch.append(z_target_step)
q_target_batch = np.array(q_target_batch)
#print q_target_batch
isweight = np.zeros((batch_size,N))
for i in range(batch_size):
for j in range(N):
isweight[i,j] = ISWeights[i]
feed_dict = {self.local_Q.inputs:np.vstack(observations),
self.local_Q.actions_q:action_now,
self.local_Q.q_target:q_target_batch,
self.local_Q.ISWeights:isweight}
u,l,g_n,v_n,_ = sess.run([self.local_Q.u,
self.local_Q.loss,
self.local_Q.grad_norms,
self.local_Q.var_norms,
self.local_Q.apply_grads],feed_dict=feed_dict)
return l/len(rollout), g_n, v_n, Q_target, u
def work(self,gamma,sess,coord,saver):
global GLOBAL_STEP
episode_count = sess.run(self.global_episodes)
total_steps = 0
epsilon = 0.2
print ("Starting worker " + str(self.number))
best_mean_episode_reward = -float('inf')
with sess.as_default(), sess.graph.as_default():
while not coord.should_stop():
sess.run(self.update_local_ops)
#episode_buffer = []
episode_reward = 0
episode_step_count = 0
d = False
s = self.env.reset()
s = process_frame(s)
if epsilon > 0.01:
epsilon = epsilon * 0.997
while not d:
#self.env.render()
GLOBAL_STEP += 1
#Take an action using probabilities from policy network output.
if random.random() > epsilon:
a_dist_list = sess.run(self.local_Q.Q, feed_dict={self.local_Q.inputs:[s]})
a_dist = a_dist_list[0]
a = np.argmax(a_dist)
else:
a = random.randint(0, 5)
s1, r, d, _ = self.env.step(a)
if d == False:
s1 = process_frame(s1)
else:
s1 = s
self.replaymemory.add([s,a,r,s1,d])
episode_reward += r
s = s1
total_steps += 1
episode_step_count += 1
if total_steps % 2 == 0 and d != True and total_steps > 50000:
episode_buffer, tree_idx, ISWeights = self.replaymemory.sample(batch_size)
l,g_n,v_n,Q_target,u = self.train(episode_buffer,sess,gamma,ISWeights)
u = np.mean(u,axis=1) + 1e-6
self.replaymemory.update_priorities(tree_idx,u)
#sess.run(self.update_local_ops)
if d == True:
break
sess.run(self.update_local_ops)
self.episode_rewards.append(episode_reward)
self.episode_lengths.append(episode_step_count)
# Periodically save gifs of episodes, model parameters, and summary statistics.
if episode_count % 5 == 0 and episode_count != 0 and total_steps > max_memory:
if self.name == 'worker_0' and episode_count % 5 == 0:
print('\n episode: ', episode_count, 'global_step:', \
GLOBAL_STEP, 'mean episode reward: ', np.mean(self.episode_rewards[-10:]), \
'epsilon: ', epsilon)
print ('loss', l, 'Qtargetmean', np.mean(Q_target))
#print 'p_target', p_target
if episode_count % 100 == 0 and self.name == 'worker_0' and total_steps > 10000:
saver.save(sess,self.model_path+'/qr-dqn-'+str(episode_count)+'.cptk')
print ("Saved Model")
mean_reward = np.mean(self.episode_rewards[-100:])
if episode_count > 20 and best_mean_episode_reward < mean_reward:
best_mean_episode_reward = mean_reward
if self.name == 'worker_0':
sess.run(self.increment)
#if episode_count%1==0:
#print('\r {} {}'.format(episode_count, episode_reward),end=' ')
episode_count += 1