def _init_model(self):
"""init model from parameters"""
self.env, env_continuous, num_states, num_actions = get_env_info(
self.env_id)
tf.keras.backend.set_floatx('float64')
# seeding
np.random.seed(self.seed)
tf.random.set_seed(self.seed)
self.env.seed(self.seed)
if env_continuous:
self.policy_net = Policy(num_states, num_actions) # current policy
else:
self.policy_net = DiscretePolicy(num_states, num_actions)
self.running_state = ZFilter((num_states, ), clip=5)
if self.model_path:
print("Loading Saved Model {}_reinforce_tf2.p".format(self.env_id))
self.running_state = pickle.load(
open(
'{}/{}_reinforce_tf2.p'.format(self.model_path,
self.env_id), "rb"))
self.policy_net.load_weights("{}/{}_reinforce_tf2".format(
self.model_path, self.env_id))
self.collector = MemoryCollector(self.env,
self.policy_net,
render=self.render,
running_state=self.running_state,
num_process=self.num_process)
self.optimizer_p = optim.Adam(lr=self.lr_p, clipnorm=20)
def _init_model(self):
"""init model from parameters"""
self.env, env_continuous, num_states, num_actions = get_env_info(
self.env_id
)
tf.keras.backend.set_floatx("float64")
# seeding
np.random.seed(self.seed)
tf.random.set_seed(self.seed)
self.env.seed(self.seed)
if env_continuous:
self.policy_net = Policy(num_states, num_actions)
else:
self.policy_net = DiscretePolicy(num_states, num_actions)
self.value_net = Value(num_states, l2_reg=1e-3)
self.running_state = ZFilter((num_states,), clip=5)
if self.model_path:
print("Loading Saved Model {}_trpo_tf2.p".format(self.env_id))
self.running_state = pickle.load(
open(
"{}/{}_trpo_tf2.p".format(self.model_path, self.env_id),
"rb",
)
)
self.policy_net.load_weights(
"{}/{}_trpo_tf2_p".format(self.model_path, self.env_id)
)
self.value_net.load_weights(
"{}/{}_trpo_tf2_v".format(self.model_path, self.env_id)
)
self.collector = MemoryCollector(
self.env,
self.policy_net,
render=self.render,
running_state=self.running_state,
num_process=self.num_process,
)
self.optimizer_v = optim.Adam(lr=self.lr_v)
class REINFORCE:
def __init__(self,
env_id,
render=False,
num_process=1,
min_batch_size=2048,
lr_p=3e-4,
gamma=0.99,
reinforce_epochs=5,
seed=1,
model_path=None):
self.env_id = env_id
self.render = render
self.num_process = num_process
self.min_batch_size = min_batch_size
self.lr_p = lr_p
self.gamma = gamma
self.reinforce_epochs = reinforce_epochs
self.model_path = model_path
self.seed = seed
self._init_model()
def _init_model(self):
"""init model from parameters"""
self.env, env_continuous, num_states, num_actions = get_env_info(
self.env_id)
tf.keras.backend.set_floatx('float64')
# seeding
np.random.seed(self.seed)
tf.random.set_seed(self.seed)
self.env.seed(self.seed)
if env_continuous:
self.policy_net = Policy(num_states, num_actions) # current policy
else:
self.policy_net = DiscretePolicy(num_states, num_actions)
self.running_state = ZFilter((num_states, ), clip=5)
if self.model_path:
print("Loading Saved Model {}_reinforce_tf2.p".format(self.env_id))
self.running_state = pickle.load(
open(
'{}/{}_reinforce_tf2.p'.format(self.model_path,
self.env_id), "rb"))
self.policy_net.load_weights("{}/{}_reinforce_tf2".format(
self.model_path, self.env_id))
self.collector = MemoryCollector(self.env,
self.policy_net,
render=self.render,
running_state=self.running_state,
num_process=self.num_process)
self.optimizer_p = optim.Adam(lr=self.lr_p, clipnorm=20)
def choose_action(self, state):
"""select action"""
state = np.expand_dims(NDOUBLE(state), 0)
action, log_prob = self.policy_net.get_action_log_prob(state)
return action, log_prob
def eval(self, i_iter, render=False):
"""init model from parameters"""
state = self.env.reset()
test_reward = 0
while True:
if render:
self.env.render()
state = self.running_state(state)
action, _ = self.choose_action(state)
action = action.numpy()[0]
state, reward, done, _ = self.env.step(action)
test_reward += reward
if done:
break
print(f"Iter: {i_iter}, test Reward: {test_reward}")
self.env.close()
def learn(self, writer, i_iter):
"""learn model"""
memory, log = self.collector.collect_samples(self.min_batch_size)
print(
f"Iter: {i_iter}, num steps: {log['num_steps']}, total reward: {log['total_reward']: .4f}, "
f"min reward: {log['min_episode_reward']: .4f}, max reward: {log['max_episode_reward']: .4f}, "
f"average reward: {log['avg_reward']: .4f}, sample time: {log['sample_time']: .4f}"
)
# record reward information
with writer.as_default():
tf.summary.scalar("total reward", log['total_reward'], i_iter)
tf.summary.scalar("average reward", log['avg_reward'], i_iter)
tf.summary.scalar("min reward", log['min_episode_reward'], i_iter)
tf.summary.scalar("max reward", log['max_episode_reward'], i_iter)
tf.summary.scalar("num steps", log['num_steps'], i_iter)
batch = memory.sample() # sample all items in memory
batch_state = NDOUBLE(batch.state)
batch_action = NDOUBLE(batch.action)
batch_reward = NDOUBLE(batch.reward)
batch_mask = NDOUBLE(batch.mask)
log_stats = {}
for _ in range(self.reinforce_epochs):
log_stats = reinforce_step(self.policy_net, self.optimizer_p,
batch_state, batch_action, batch_reward,
batch_mask, self.gamma)
with writer.as_default():
tf.summary.scalar("policy loss", log_stats["policy_loss"], i_iter)
return log_stats
def save(self, save_path):
"""save model"""
check_path(save_path)
pickle.dump(
self.running_state,
open('{}/{}_reinforce_tf2.p'.format(save_path, self.env_id), 'wb'))
self.policy_net.save_weights("{}/{}_reinforce_tf2".format(
save_path, self.env_id))
class PPO:
def __init__(self,
env_id,
render=False,
num_process=4,
min_batch_size=2048,
lr_p=3e-4,
lr_v=3e-4,
gamma=0.99,
tau=0.95,
clip_epsilon=0.2,
ppo_epochs=10,
ppo_mini_batch_size=64,
seed=1,
model_path=None):
self.env_id = env_id
self.gamma = gamma
self.tau = tau
self.ppo_epochs = ppo_epochs
self.ppo_mini_batch_size = ppo_mini_batch_size
self.clip_epsilon = clip_epsilon
self.render = render
self.num_process = num_process
self.lr_p = lr_p
self.lr_v = lr_v
self.min_batch_size = min_batch_size
self.model_path = model_path
self.seed = seed
self._init_model()
def _init_model(self):
"""init model from parameters"""
self.env, env_continuous, num_states, num_actions = get_env_info(
self.env_id)
tf.keras.backend.set_floatx('float64')
# seeding
np.random.seed(self.seed)
tf.random.set_seed(self.seed)
self.env.seed(self.seed)
if env_continuous:
self.policy_net = Policy(num_states, num_actions)
else:
self.policy_net = DiscretePolicy(num_states, num_actions)
self.value_net = Value(num_states, l2_reg=1e-3)
self.running_state = ZFilter((num_states, ), clip=5)
if self.model_path:
print("Loading Saved Model {}_ppo_tf2.p".format(self.env_id))
self.running_state = pickle.load(
open('{}/{}_ppo_tf2.p'.format(self.model_path, self.env_id),
"rb"))
self.policy_net.load_weights("{}/{}_ppo_tf2_p".format(
self.model_path, self.env_id))
self.value_net.load_weights("{}/{}_ppo_tf2_v".format(
self.model_path, self.env_id))
self.collector = MemoryCollector(self.env,
self.policy_net,
render=self.render,
running_state=self.running_state,
num_process=self.num_process)
self.optimizer_p = optim.Adam(lr=self.lr_p, clipnorm=20)
self.optimizer_v = optim.Adam(lr=self.lr_v)
def choose_action(self, state):
"""select action"""
state = np.expand_dims(NDOUBLE(state), 0)
action, log_prob = self.policy_net.get_action_log_prob(state)
action = action.numpy()[0]
return action
def eval(self, i_iter, render=False):
"""init model from parameters"""
state = self.env.reset()
test_reward = 0
while True:
if render:
self.env.render()
state = self.running_state(state)
action = self.choose_action(state)
state, reward, done, _ = self.env.step(action)
test_reward += reward
if done:
break
print(f"Iter: {i_iter}, test Reward: {test_reward}")
self.env.close()
def learn(self, writer, i_iter):
"""learn model"""
memory, log = self.collector.collect_samples(self.min_batch_size)
print(
f"Iter: {i_iter}, num steps: {log['num_steps']}, total reward: {log['total_reward']: .4f}, "
f"min reward: {log['min_episode_reward']: .4f}, max reward: {log['max_episode_reward']: .4f}, "
f"average reward: {log['avg_reward']: .4f}, sample time: {log['sample_time']: .4f}"
)
# record reward information
with writer.as_default():
tf.summary.scalar("total reward", log['total_reward'], i_iter)
tf.summary.scalar("average reward", log['avg_reward'], i_iter)
tf.summary.scalar("min reward", log['min_episode_reward'], i_iter)
tf.summary.scalar("max reward", log['max_episode_reward'], i_iter)
tf.summary.scalar("num steps", log['num_steps'], i_iter)
batch = memory.sample() # sample all items in memory
batch_state = NDOUBLE(batch.state)
batch_action = NDOUBLE(batch.action)
batch_reward = NDOUBLE(batch.reward)
batch_mask = NDOUBLE(batch.mask)
batch_log_prob = NDOUBLE(batch.log_prob)[:, None]
batch_value = tf.stop_gradient(self.value_net(batch_state))
batch_advantage, batch_return = estimate_advantages(
batch_reward, batch_mask, batch_value, self.gamma, self.tau)
log_stats = {}
if self.ppo_mini_batch_size:
batch_size = batch_state.shape[0]
mini_batch_num = batch_size // self.ppo_mini_batch_size
for e in range(self.ppo_epochs):
perm = np.random.permutation(batch_size)
for i in range(mini_batch_num):
ind = perm[slice(
i * self.ppo_mini_batch_size,
min(batch_size, (i + 1) * self.ppo_mini_batch_size))]
log_stats = ppo_step(self.policy_net, self.value_net,
self.optimizer_p, self.optimizer_v, 1,
batch_state[ind], batch_action[ind],
batch_return[ind],
batch_advantage[ind],
batch_log_prob[ind],
self.clip_epsilon)
else:
for _ in range(self.ppo_epochs):
log_stats = ppo_step(self.policy_net, self.value_net,
self.optimizer_p, self.optimizer_v, 1,
batch_state, batch_action, batch_return,
batch_advantage, batch_log_prob,
self.clip_epsilon)
with writer.as_default():
tf.summary.histogram("ratio", log_stats["ratio"], i_iter)
tf.summary.scalar("policy loss", log_stats["policy_loss"], i_iter)
tf.summary.scalar("critic loss", log_stats["critic_loss"], i_iter)
writer.flush()
return log_stats
def save(self, save_path):
"""save model"""
check_path(save_path)
pickle.dump(
self.running_state,
open('{}/{}_ppo_tf2.p'.format(save_path, self.env_id), 'wb'))
self.policy_net.save_weights("{}/{}_ppo_tf2_p".format(
save_path, self.env_id))
self.value_net.save_weights("{}/{}_ppo_tf2_v".format(
save_path, self.env_id))
class TRPO:
def __init__(
self,
env_id,
render=False,
num_process=1,
min_batch_size=2048,
lr_v=3e-4,
gamma=0.99,
tau=0.95,
max_kl=1e-2,
damping=1e-2,
seed=1,
model_path=None,
):
self.env_id = env_id
self.gamma = gamma
self.tau = tau
self.max_kl = max_kl
self.damping = damping
self.render = render
self.num_process = num_process
self.lr_v = lr_v
self.min_batch_size = min_batch_size
self.model_path = model_path
self.seed = seed
self._init_model()
def _init_model(self):
"""init model from parameters"""
self.env, env_continuous, num_states, num_actions = get_env_info(
self.env_id
)
tf.keras.backend.set_floatx("float64")
# seeding
np.random.seed(self.seed)
tf.random.set_seed(self.seed)
self.env.seed(self.seed)
if env_continuous:
self.policy_net = Policy(num_states, num_actions)
else:
self.policy_net = DiscretePolicy(num_states, num_actions)
self.value_net = Value(num_states, l2_reg=1e-3)
self.running_state = ZFilter((num_states,), clip=5)
if self.model_path:
print("Loading Saved Model {}_trpo_tf2.p".format(self.env_id))
self.running_state = pickle.load(
open(
"{}/{}_trpo_tf2.p".format(self.model_path, self.env_id),
"rb",
)
)
self.policy_net.load_weights(
"{}/{}_trpo_tf2_p".format(self.model_path, self.env_id)
)
self.value_net.load_weights(
"{}/{}_trpo_tf2_v".format(self.model_path, self.env_id)
)
self.collector = MemoryCollector(
self.env,
self.policy_net,
render=self.render,
running_state=self.running_state,
num_process=self.num_process,
)
self.optimizer_v = optim.Adam(lr=self.lr_v)
def choose_action(self, state):
"""select action"""
state = np.expand_dims(NDOUBLE(state), 0)
action, log_prob = self.policy_net.get_action_log_prob(state)
action = action.numpy()[0]
return action
def eval(self, i_iter, render=False):
"""init model from parameters"""
state = self.env.reset()
test_reward = 0
while True:
if render:
self.env.render()
state = self.running_state(state)
action = self.choose_action(state)
state, reward, done, _ = self.env.step(action)
test_reward += reward
if done:
break
print(f"Iter: {i_iter}, test Reward: {test_reward}")
self.env.close()
def learn(self, writer, i_iter):
"""learn model"""
memory, log = self.collector.collect_samples(self.min_batch_size)
print(
f"Iter: {i_iter}, num steps: {log['num_steps']}, total reward: {log['total_reward']: .4f}, "
f"min reward: {log['min_episode_reward']: .4f}, max reward: {log['max_episode_reward']: .4f}, "
f"average reward: {log['avg_reward']: .4f}, sample time: {log['sample_time']: .4f}"
)
# record reward information
with writer.as_default():
tf.summary.scalar("total reward", log["total_reward"], i_iter)
tf.summary.scalar("average reward", log["avg_reward"], i_iter)
tf.summary.scalar("min reward", log["min_episode_reward"], i_iter)
tf.summary.scalar("max reward", log["max_episode_reward"], i_iter)
tf.summary.scalar("num steps", log["num_steps"], i_iter)
batch = memory.sample() # sample all items in memory
batch_state = NDOUBLE(batch.state)
batch_action = NDOUBLE(batch.action)
batch_reward = NDOUBLE(batch.reward)
batch_mask = NDOUBLE(batch.mask)
batch_log_prob = NDOUBLE(batch.log_prob)[:, None]
batch_value = tf.stop_gradient(self.value_net(batch_state))
batch_advantage, batch_return = estimate_advantages(
batch_reward, batch_mask, batch_value, self.gamma, self.tau
)
# update by TRPO
log_stats = trpo_step(
self.policy_net,
self.value_net,
self.optimizer_v,
batch_state,
batch_action,
batch_log_prob,
batch_advantage,
batch_return,
max_kl=self.max_kl,
cg_damping=self.damping,
vf_iters=10
)
with writer.as_default():
for k, v in log_stats.items():
tf.summary.scalar(k, v, i_iter)
writer.flush()
return log_stats
def save(self, save_path):
"""save model"""
check_path(save_path)
pickle.dump(
self.running_state,
open("{}/{}_trpo_tf2.p".format(save_path, self.env_id), "wb"),
)
self.policy_net.save_weights(
"{}/{}_trpo_tf2_p".format(save_path, self.env_id)
)
self.value_net.save_weights(
"{}/{}_trpo_tf2_v".format(save_path, self.env_id)
)