class DDPG(object):
def __init__(self,
actor,
critic,
memory,
observation_shape,
action_shape,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.):
# Inputs.
self.obs0 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs0')
self.obs1 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs1')
self.terminals1 = tf.placeholder(tf.float32,
shape=(None, 1),
name='terminals1')
self.rewards = tf.placeholder(tf.float32,
shape=(None, 1),
name='rewards')
self.actions = tf.placeholder(tf.float32,
shape=(None, ) + action_shape,
name='actions')
self.critic_target = tf.placeholder(tf.float32,
shape=(None, 1),
name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32,
shape=(),
name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
self.save = None
self.load = None
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf, self.return_range[0],
self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0,
self.actor_tf,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
Q_obs1 = denormalize(
target_critic(normalized_obs1, target_actor(normalized_obs1)),
self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
self.initial_state = None # recurrent architectures not supported yet
def setup_target_network_updates(self):
actor_init_updates, actor_soft_updates = get_target_updates(
self.actor.vars, self.target_actor.vars, self.tau)
critic_init_updates, critic_soft_updates = get_target_updates(
self.critic.vars, self.target_critic.vars, self.tau)
self.target_init_updates = [actor_init_updates, critic_init_updates]
self.target_soft_updates = [actor_soft_updates, critic_soft_updates]
def setup_param_noise(self, normalized_obs0):
assert self.param_noise is not None
# Configure perturbed actor.
param_noise_actor = copy(self.actor)
param_noise_actor.name = 'param_noise_actor'
self.perturbed_actor_tf = param_noise_actor(normalized_obs0)
logger.info('setting up param noise')
self.perturb_policy_ops = get_perturbed_actor_updates(
self.actor, param_noise_actor, self.param_noise_stddev)
# Configure separate copy for stddev adoption.
adaptive_param_noise_actor = copy(self.actor)
adaptive_param_noise_actor.name = 'adaptive_param_noise_actor'
adaptive_actor_tf = adaptive_param_noise_actor(normalized_obs0)
self.perturb_adaptive_policy_ops = get_perturbed_actor_updates(
self.actor, adaptive_param_noise_actor, self.param_noise_stddev)
self.adaptive_policy_distance = tf.sqrt(
tf.reduce_mean(tf.square(self.actor_tf - adaptive_actor_tf)))
def setup_actor_optimizer(self):
logger.info('setting up actor optimizer')
self.actor_loss = -tf.reduce_mean(self.critic_with_actor_tf)
actor_shapes = [
var.get_shape().as_list() for var in self.actor.trainable_vars
]
actor_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
self.actor_grads = U.flatgrad(self.actor_loss,
self.actor.trainable_vars,
clip_norm=self.clip_norm)
self.actor_optimizer = MpiAdam(var_list=self.actor.trainable_vars,
beta1=0.9,
beta2=0.999,
epsilon=1e-08)
def setup_critic_optimizer(self):
logger.info('setting up critic optimizer')
normalized_critic_target_tf = tf.clip_by_value(
normalize(self.critic_target, self.ret_rms), self.return_range[0],
self.return_range[1])
self.critic_loss = tf.reduce_mean(
tf.square(self.normalized_critic_tf - normalized_critic_target_tf))
if self.critic_l2_reg > 0.:
critic_reg_vars = [
var for var in self.critic.trainable_vars
if var.name.endswith('/w:0') and 'output' not in var.name
]
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(
self.critic_l2_reg))
critic_reg = tc.layers.apply_regularization(
tc.layers.l2_regularizer(self.critic_l2_reg),
weights_list=critic_reg_vars)
self.critic_loss += critic_reg
critic_shapes = [
var.get_shape().as_list() for var in self.critic.trainable_vars
]
critic_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
self.critic_grads = U.flatgrad(self.critic_loss,
self.critic.trainable_vars,
clip_norm=self.clip_norm)
self.critic_optimizer = MpiAdam(var_list=self.critic.trainable_vars,
beta1=0.9,
beta2=0.999,
epsilon=1e-08)
def setup_popart(self):
# See https://arxiv.org/pdf/1602.07714.pdf for details.
self.old_std = tf.placeholder(tf.float32, shape=[1], name='old_std')
new_std = self.ret_rms.std
self.old_mean = tf.placeholder(tf.float32, shape=[1], name='old_mean')
new_mean = self.ret_rms.mean
self.renormalize_Q_outputs_op = []
for vs in [self.critic.output_vars, self.target_critic.output_vars]:
assert len(vs) == 2
M, b = vs
assert 'kernel' in M.name
assert 'bias' in b.name
assert M.get_shape()[-1] == 1
assert b.get_shape()[-1] == 1
self.renormalize_Q_outputs_op += [
M.assign(M * self.old_std / new_std)
]
self.renormalize_Q_outputs_op += [
b.assign(
(b * self.old_std + self.old_mean - new_mean) / new_std)
]
def setup_stats(self):
ops = []
names = []
if self.normalize_returns:
ops += [self.ret_rms.mean, self.ret_rms.std]
names += ['ret_rms_mean', 'ret_rms_std']
if self.normalize_observations:
ops += [
tf.reduce_mean(self.obs_rms.mean),
tf.reduce_mean(self.obs_rms.std)
]
names += ['obs_rms_mean', 'obs_rms_std']
ops += [tf.reduce_mean(self.critic_tf)]
names += ['reference_Q_mean']
ops += [reduce_std(self.critic_tf)]
names += ['reference_Q_std']
ops += [tf.reduce_mean(self.critic_with_actor_tf)]
names += ['reference_actor_Q_mean']
ops += [reduce_std(self.critic_with_actor_tf)]
names += ['reference_actor_Q_std']
ops += [tf.reduce_mean(self.actor_tf)]
names += ['reference_action_mean']
ops += [reduce_std(self.actor_tf)]
names += ['reference_action_std']
if self.param_noise:
ops += [tf.reduce_mean(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_mean']
ops += [reduce_std(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_std']
self.stats_ops = ops
self.stats_names = names
def step(self, obs, apply_noise=True, compute_Q=True):
if self.param_noise is not None and apply_noise:
actor_tf = self.perturbed_actor_tf
else:
actor_tf = self.actor_tf
feed_dict = {self.obs0: U.adjust_shape(self.obs0, [obs])}
if compute_Q:
action, q = self.sess.run([actor_tf, self.critic_with_actor_tf],
feed_dict=feed_dict)
else:
action = self.sess.run(actor_tf, feed_dict=feed_dict)
q = None
if self.action_noise is not None and apply_noise:
noise = self.action_noise()
assert noise.shape == action[0].shape
action += noise
action = np.clip(action, self.action_range[0], self.action_range[1])
return action, q, None, None
def store_transition(self, obs0, action, reward, obs1, terminal1):
reward *= self.reward_scale
B = obs0.shape[0]
for b in range(B):
self.memory.append(obs0[b], action[b], reward[b], obs1[b],
terminal1[b])
if self.normalize_observations:
self.obs_rms.update(np.array([obs0[b]]))
def train(self):
# Get a batch.
batch = self.memory.sample(batch_size=self.batch_size)
if self.normalize_returns and self.enable_popart:
old_mean, old_std, target_Q = self.sess.run(
[self.ret_rms.mean, self.ret_rms.std, self.target_Q],
feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
self.ret_rms.update(target_Q.flatten())
self.sess.run(self.renormalize_Q_outputs_op,
feed_dict={
self.old_std: np.array([old_std]),
self.old_mean: np.array([old_mean]),
})
# Run sanity check. Disabled by default since it slows down things considerably.
# print('running sanity check')
# target_Q_new, new_mean, new_std = self.sess.run([self.target_Q, self.ret_rms.mean, self.ret_rms.std], feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
# print(target_Q_new, target_Q, new_mean, new_std)
# assert (np.abs(target_Q - target_Q_new) < 1e-3).all()
else:
target_Q = self.sess.run(self.target_Q,
feed_dict={
self.obs1:
batch['obs1'],
self.rewards:
batch['rewards'],
self.terminals1:
batch['terminals1'].astype('float32'),
})
# Get all gradients and perform a synced update.
ops = [
self.actor_grads, self.actor_loss, self.critic_grads,
self.critic_loss
]
actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(
ops,
feed_dict={
self.obs0: batch['obs0'],
self.actions: batch['actions'],
self.critic_target: target_Q,
})
self.actor_optimizer.update(actor_grads, stepsize=self.actor_lr)
self.critic_optimizer.update(critic_grads, stepsize=self.critic_lr)
return critic_loss, actor_loss
def initialize(self, sess):
self.sess = sess
self.sess.run(tf.global_variables_initializer())
self.save = functools.partial(save_variables, sess=self.sess)
self.load = functools.partial(load_variables, sess=self.load)
self.actor_optimizer.sync()
self.critic_optimizer.sync()
self.sess.run(self.target_init_updates)
def update_target_net(self):
self.sess.run(self.target_soft_updates)
def get_stats(self):
if self.stats_sample is None:
# Get a sample and keep that fixed for all further computations.
# This allows us to estimate the change in value for the same set of inputs.
self.stats_sample = self.memory.sample(batch_size=self.batch_size)
values = self.sess.run(self.stats_ops,
feed_dict={
self.obs0: self.stats_sample['obs0'],
self.actions: self.stats_sample['actions'],
})
names = self.stats_names[:]
assert len(names) == len(values)
stats = dict(zip(names, values))
if self.param_noise is not None:
stats = {**stats, **self.param_noise.get_stats()}
return stats
def adapt_param_noise(self):
try:
from mpi4py import MPI
except ImportError:
MPI = None
if self.param_noise is None:
return 0.
# Perturb a separate copy of the policy to adjust the scale for the next "real" perturbation.
batch = self.memory.sample(batch_size=self.batch_size)
self.sess.run(self.perturb_adaptive_policy_ops,
feed_dict={
self.param_noise_stddev:
self.param_noise.current_stddev,
})
distance = self.sess.run(self.adaptive_policy_distance,
feed_dict={
self.obs0:
batch['obs0'],
self.param_noise_stddev:
self.param_noise.current_stddev,
})
if MPI is not None:
mean_distance = MPI.COMM_WORLD.allreduce(
distance, op=MPI.SUM) / MPI.COMM_WORLD.Get_size()
else:
mean_distance = distance
if MPI is not None:
mean_distance = MPI.COMM_WORLD.allreduce(
distance, op=MPI.SUM) / MPI.COMM_WORLD.Get_size()
else:
mean_distance = distance
self.param_noise.adapt(mean_distance)
return mean_distance
def reset(self):
# Reset internal state after an episode is complete.
if self.action_noise is not None:
self.action_noise.reset()
if self.param_noise is not None:
self.sess.run(self.perturb_policy_ops,
feed_dict={
self.param_noise_stddev:
self.param_noise.current_stddev,
})
def _normalize_clip_observation(x, clip_range=[-5.0, 5.0]):
rms = RunningMeanStd(shape=x.shape[1:])
norm_x = tf.clip_by_value((x - rms.mean) / rms.std, min(clip_range),
max(clip_range))
return norm_x, rms
def __init__(self, actor, critic, memory, observation_shape, action_shape, param_noise=None, action_noise=None,
gamma=0.99, tau=0.001, normalize_returns=False, enable_popart=False, normalize_observations=True,
batch_size=128, observation_range=(-1., 1.), action_range= [0.2, 0.2, 0.2, 0.2, 0.2, 0.2], return_range=(-np.inf, np.inf),
adaptive_param_noise=True, critic_l2_reg=0.,
adaptive_param_noise_policy_threshold=.1, actor_lr=1e-4, critic_lr=1e-3, clip_norm=None, reward_scale=1., restore=False):
# Inputs.
# self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs0')
self.obs0 = tf.placeholder(tf.float32, shape=(None, observation_shape), name='obs0')
# self.obs1 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs1')
self.obs1 = tf.placeholder(tf.float32, shape=(None, observation_shape), name='obs1')
self.terminals1 = tf.placeholder(tf.float32, shape=(None, 1), name='terminals1')
self.rewards = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions = tf.placeholder(tf.float32, shape=(None, action_shape), name='actions')
self.critic_target = tf.placeholder(tf.float32, shape=(None, 1), name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32, shape=(), name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(tf.clip_by_value(self.normalized_critic_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0, self.actor_tf, reuse=True)
self.critic_with_actor_tf = denormalize(tf.clip_by_value(self.normalized_critic_with_actor_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
Q_obs1 = denormalize(target_critic(normalized_obs1, target_actor(normalized_obs1)), self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
"""Filewriter summary"""
monitor_directory = os.path.join("Experiment_data")
self.summary_dir = os.path.join(monitor_directory, "summary")
# if restore:
# dirname = 'run20' # The last name
# self.summary_dir = os.path.join(self.summary_dir, dirname)
# else:
self.summary_dir = utils.new_summary_dir(self.summary_dir)
# record the detailed parameters
utils.log_params(self.summary_dir, {
"actor learning rate": self.actor_lr,
"critic learning rate": self.critic_lr,
"batch size": self.batch_size,
"actor update rate": self.tau,
"critic update rate": self.tau,
"action noise": self.action_noise,
"param noise": self.param_noise,
"reward function": 'General reward function',
"result_function": 'The second 100'
})
self.merged = tf.summary.merge_all()
def _init(self,
np_random,
flavor,
dim,
hid_size=32,
n_hid=2,
alpha_sysid=0.1,
test=False):
print("obs dim:", dim.ob)
# inputs & hyperparameters
self.flavor = flavor
self.dim = dim
self.alpha_sysid = alpha_sysid
self.ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=(None, dim.ob_concat))
self.ob_traj = U.get_placeholder(name="ob_traj",
dtype=tf.float32,
shape=[None, dim.window, dim.ob])
self.ac_traj = U.get_placeholder(name="ac_traj",
dtype=tf.float32,
shape=[None, dim.window, dim.ac])
# regular inputs whitening
ob, sysid = tf.split(self.ob, [dim.ob, dim.sysid], axis=1)
with tf.variable_scope("ob_filter"):
self.ob_rms = RunningMeanStd(shape=(dim.ob_concat))
obz_all = tf.clip_by_value(
(self.ob - self.ob_rms.mean) / self.ob_rms.std,
-5.0,
5.0,
name="ob_normalizer")
obz, sysidz = tf.split(obz_all, [dim.ob, dim.sysid], axis=1)
print("obz dim:", obz.shape, "sysidz dim:", sysidz.shape)
with tf.variable_scope("ob_white"):
obz = tf.identity(obz)
with tf.variable_scope("sysid_white"):
self.sysidz = tf.identity(sysidz)
# trajectory inputs for SysID
# NOTE: the environment should be defined such that
# actions are relatively close to Normal(0,1)
ob_trajz = tf.clip_by_value(
(self.ob_traj - self.ob_rms.mean[:dim.ob]) /
self.ob_rms.std[:dim.ob],
-5.0,
5.0,
name="ob_traj_white")
trajs = tf.concat([ob_trajz, self.ac_traj], axis=2)
# these rewards will be optimized via direct gradient-based optimization
# (not RL reward), in the same place as e.g. the entropy regularization
self.extra_rewards = []
self.extra_reward_names = []
with tf.variable_scope("sysid"):
if flavor == PLAIN:
self.traj2sysid = sysid_convnet(np_random, trajs, dim.sysid)
elif flavor == EXTRA:
self.traj2sysid = sysid_convnet(np_random, trajs, dim.sysid)
elif flavor == EMBED:
self.traj2embed = sysid_convnet(np_random, trajs, dim.embed)
EMBED_N_HID = 2
EMBED_HID_SZ = 2 * dim.sysid
# policy
with tf.variable_scope("pol"):
if flavor == BLIND:
policy_input = obz
self.sysid_err_supervised = tf.constant(0.0)
elif flavor == PLAIN:
self.sysid_err_supervised = tf.losses.mean_squared_error(
tf.stop_gradient(sysidz), self.traj2sysid)
policy_input = tf.concat([obz, self.traj2sysid
]) if test else obz_all
elif flavor == EXTRA:
sysid_processor_input = self.traj2sysid if test else sysidz
sysid_processor = MLPModule(np_random, sysid_processor_input,
EMBED_N_HID, EMBED_HID_SZ, 1.0,
dim.embed, "sysid_processor")
policy_input = tf.concat([obz, sysid_processor],
axis=1,
name="input_concat")
self.sysid_err_supervised = tf.losses.mean_squared_error(
tf.stop_gradient(sysidz), self.traj2sysid)
elif flavor == EMBED:
self.embed = MLPModule(np_random, sysidz, EMBED_N_HID,
EMBED_HID_SZ, 1.0, dim.embed, "embed")
embed_input = self.traj2embed if test else self.embed
policy_input = tf.concat([obz, embed_input],
axis=1,
name="input_concat")
self.sysid_err_supervised = tf.losses.mean_squared_error(
tf.stop_gradient(self.embed), self.traj2embed)
mean, var = tf.nn.moments(self.embed, 0)
dist = tf.distributions.Normal(loc=mean, scale=tf.sqrt(var))
std_dist = tf.distributions.Normal(loc=0.0, scale=1.0)
embed_KL = tf.reduce_mean(
tf.distributions.kl_divergence(dist, std_dist))
self.extra_rewards.append(-0.1 * embed_KL)
self.extra_reward_names.append("neg_embed_KL")
elif flavor == TRAJ:
self.traj_conv = sysid_convnet(np_random, trajs, dim.embed)
policy_input = tf.concat([obz, self.traj_conv],
axis=1,
name="input_concat")
self.sysid_err_supervised = tf.constant(0.0)
else:
raise ValueError("flavor '{}' does not exist".format(flavor))
# main policy MLP. outputs mean and logstd of stochastic Gaussian policy
with tf.variable_scope("policy"):
print("policy input dimensionality:",
policy_input.get_shape().as_list())
mean = MLPModule(np_random, policy_input, n_hid, hid_size,
0.01, dim.ac, "pol")
logstd = tf.maximum(
tf.get_variable(name="logstd",
shape=[1, dim.ac],
initializer=tf.constant_initializer(-0.3)),
-1.0)
with tf.variable_scope("policy_to_gaussian"):
pdparam = tf.concat([mean, mean * 0.0 + logstd], 1)
self.pdtype = DiagGaussianPdType(dim.ac)
self.pd = self.pdtype.pdfromflat(pdparam)
# value function
with tf.variable_scope("vf"):
self.vpred = MLPModule(np_random, tf.stop_gradient(policy_input),
n_hid, hid_size, 0.1, 1, "vf")[:, 0]
# switch between stochastic and deterministic policy
with tf.variable_scope("stochastic_switch"):
self.stochastic = tf.placeholder(dtype=tf.bool,
shape=(),
name="stochastic")
self.ac = U.switch(self.stochastic, self.pd.sample(),
self.pd.mode())
# function we'll call when interacting with environment
self._act = U.function([self.stochastic, self.ob],
[self.ac, self.vpred])
# for test time, the trajectory is fed in
self._act_traj = U.function(
[self.stochastic, self.ob, self.ob_traj, self.ac_traj],
[self.ac, self.vpred])
class TransitionClassifier(object):
def __init__(self,
ob_size,
ac_size,
hidden_size=100,
log_reward=False,
entcoeff=0.001,
scope="adversary",
dyn_norm=True):
self.scope = scope
self.ob_size = ob_size
self.ac_size = ac_size
# self.input_size = ob_size + ac_size
self.hidden_size = hidden_size
self.log_reward = log_reward
self.dyn_norm = dyn_norm
self.build_ph()
# Build grpah
generator_logits = self.build_graph(self.generator_obs_ph,
self.generator_acs_ph)
expert_logits = self.build_graph(self.expert_obs_ph,
self.expert_acs_ph)
# Build accuracy
generator_acc = tf.reduce_mean(
tf.cast(tf.nn.sigmoid(generator_logits) < 0.5, tf.float32))
expert_acc = tf.reduce_mean(
tf.cast(tf.nn.sigmoid(expert_logits) > 0.5, tf.float32))
# Build regression loss
# let x = logits, z = targets.
# z * -log(sigmoid(x)) + (1 - z) * -log(1 - sigmoid(x))
generator_loss = tf.nn.sigmoid_cross_entropy_with_logits(
logits=generator_logits, labels=tf.zeros_like(generator_logits))
generator_loss = tf.reduce_mean(generator_loss)
expert_loss = tf.nn.sigmoid_cross_entropy_with_logits(
logits=expert_logits, labels=tf.ones_like(expert_logits))
expert_loss = tf.reduce_mean(expert_loss)
# Build entropy loss
logits = tf.concat([generator_logits, expert_logits], 0)
entropy = tf.reduce_mean(logit_bernoulli_entropy(logits))
entropy_loss = -entcoeff * entropy
# Loss + Accuracy terms
self.losses = [
generator_loss, expert_loss, entropy, entropy_loss, generator_acc,
expert_acc
]
self.loss_name = [
"generator_loss", "expert_loss", "entropy", "entropy_loss",
"generator_acc", "expert_acc"
]
self.total_loss = generator_loss + expert_loss + entropy_loss
# Build Reward for policy
if log_reward:
reward_op = -tf.log(1 - tf.nn.sigmoid(generator_logits) + 1e-8)
else:
reward_op = tf.nn.sigmoid(generator_logits)
self.reward = U.function(
[self.generator_obs_ph, self.generator_acs_ph], reward_op)
lr = tf.placeholder(tf.float32, None)
self.trainer = tf.train.AdamOptimizer(learning_rate=lr)
gvs = self.trainer.compute_gradients(self.total_loss,
self.get_trainable_variables())
self._train = U.function([
self.generator_obs_ph, self.generator_acs_ph, self.expert_obs_ph,
self.expert_acs_ph, lr
],
self.losses,
updates=[self.trainer.apply_gradients(gvs)])
def build_ph(self):
self.generator_obs_ph = tf.placeholder(tf.float32,
(None, self.ob_size),
name="observations_ph")
self.generator_acs_ph = tf.placeholder(tf.float32,
(None, self.ac_size),
name="actions_ph")
self.expert_obs_ph = tf.placeholder(tf.float32, (None, self.ob_size),
name="expert_observations_ph")
self.expert_acs_ph = tf.placeholder(tf.float32, (None, self.ac_size),
name="expert_actions_ph")
def build_graph(self, obs_ph, acs_ph):
with tf.variable_scope(self.scope, reuse=tf.AUTO_REUSE):
with tf.variable_scope("obfilter"):
self.obs_rms = RunningMeanStd(shape=[self.ob_size])
obs = normalize(obs_ph, self.obs_rms)
_input = tf.concat(
[obs, acs_ph],
axis=1) # concatenate the two input -> form a transition
p_h1 = tf.contrib.layers.fully_connected(_input,
self.hidden_size,
activation_fn=tf.nn.tanh)
p_h2 = tf.contrib.layers.fully_connected(p_h1,
self.hidden_size,
activation_fn=tf.nn.tanh)
logits = tf.contrib.layers.fully_connected(p_h2,
1,
activation_fn=None)
return logits
def get_trainable_variables(self):
return tf.trainable_variables(self.scope)
def get_reward(self, obs, acs):
return np.squeeze(self.reward(obs, acs))
def build_reward_op(self, obs_ph, acs_ph):
logits = self.build_graph(obs_ph, acs_ph)
if self.log_reward:
return -tf.log(1 - tf.nn.sigmoid(logits) + 1e-8)
return tf.nn.sigmoid(logits)
def set_expert_data(self, data):
self.data = Dataset(data, deterministic=False)
def train(self, rl_ob, rl_ac, steps=1, lr=3e-4):
n = rl_ob.shape[0]
loss_buf = []
batch_size = rl_ob.shape[0] // steps
for batch in iterbatches([rl_ob, rl_ac],
include_final_partial_batch=False,
batch_size=batch_size):
exp_ob, exp_ac = self.data.next_batch(batch_size)
if self.obs_rms and self.dyn_norm:
self.obs_rms.update(np.concatenate([exp_ob, rl_ob], axis=0))
loss_buf.append(self._train(*batch, exp_ob, exp_ac, lr))
logger.info(fmt_row(13, self.loss_name))
logger.info(fmt_row(13, np.mean(loss_buf, axis=0)))
class MADDPG(object):
def __init__(self,
name,
actor,
critic,
memory,
obs_space_n,
act_space_n,
agent_index,
obs_rms,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.):
self.name = name
self.num_agents = len(obs_space_n)
self.agent_index = agent_index
from gym import spaces
continuous_ctrl = not isinstance(act_space_n[0], spaces.Discrete)
# TODO: remove after testing
assert continuous_ctrl
# Multi-agent inputs
# self.obs0 = []
# self.obs1 = []
self.actions = []
# self.norm_obs0_ph = []
# self.norm_obs1_ph = []
self.obs0 = tf.placeholder(tf.float32,
shape=(
self.num_agents,
None,
) + obs_space_n[self.agent_index].shape,
name="obs0")
self.obs1 = tf.placeholder(tf.float32,
shape=(
self.num_agents,
None,
) + obs_space_n[self.agent_index].shape,
name="obs1")
# if continuous_ctrl:
# self.actions = tf.placeholder(tf.float32, shape=(self.num_agents, None,) + act_space_n[self.agent_index].shape, name="action")
# else:
# act_pdtype_n = [make_pdtype(act_space) for act_space in act_space_n]
# self.actions = [act_pdtype_n[i].sample_placeholder([None], name="action"+str(i)) for i in range(len(act_space_n))]
# this is required to reshape obs and actions for concatenation
obs_shape_list = [self.num_agents] + list(
obs_space_n[self.agent_index].shape)
act_shape_list = [self.num_agents] + list(
act_space_n[self.agent_index].shape)
self.obs_shape_prod = np.prod(obs_shape_list)
self.act_shape_prod = np.prod(act_shape_list)
for i in range(self.num_agents):
# each obs in obs0,obs1 contains info about ego agent and relative pos/vel of other agents
# self.obs0.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="obs0_"+str(i)))
# self.obs1.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="obs1_"+str(i)))
if continuous_ctrl:
self.actions.append(
tf.placeholder(tf.float32,
shape=[None] + list(act_space_n[i].shape),
name="action" + str(i)))
else:
self.actions.append(
make_pdtype(act_space_n[i]).sample_placeholder(
[None], name="action" + str(i)))
# self.norm_obs0_ph.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="norm_obs0_"+str(i)))
# self.norm_obs1_ph.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="norm_obs1_"+str(i)))
# self.norm_obs0_ph = tf.placeholder(tf.float32, shape=[self.num_agents, None] + list(obs_space_n[self.agent_index].shape), name="norm_obs0")
# self.norm_obs1_ph = tf.placeholder(tf.float32, shape=[self.num_agents, None] + list(obs_space_n[self.agent_index].shape), name="norm_obs1")
# we only provide single agent inputs for these placeholders
self.terminals1 = tf.placeholder(tf.float32,
shape=(None, 1),
name='terminals1')
self.rewards = tf.placeholder(tf.float32,
shape=(None, 1),
name='rewards')
self.critic_target = tf.placeholder(tf.float32,
shape=(None, 1),
name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32,
shape=(),
name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
# Observation normalization.
# TODO: need to update the replay buffer storage function to account for multiple agents
if self.normalize_observations:
self.obs_rms = obs_rms
else:
self.obs_rms = None
# Need to transpose observations so we can normalize them
# converts tensor to shape (batch_size, num_agents, space_size)
# transose on dim 0 and 1, leave dim 2 unchanged
obs0_t = tf.transpose(self.obs0, perm=[1, 0, 2])
obs1_t = tf.transpose(self.obs1, perm=[1, 0, 2])
actions_t = tf.transpose(self.actions, perm=[1, 0, 2])
# each entry in obs_t is normalized wrt the agent
normalized_obs0 = tf.clip_by_value(normalize(obs0_t, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(obs1_t, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
# convert the obs to original shape after normalization for convenience
normalized_act_obs0 = tf.transpose(normalized_obs0, perm=[1, 0, 2])
normalized_act_obs1 = tf.transpose(normalized_obs1, perm=[1, 0, 2])
# need to specify exact shape, since we dont always pass batch size number of obs/act
normalized_obs0_flat = tf.reshape(normalized_obs0,
[-1, self.obs_shape_prod])
normalized_obs1_flat = tf.reshape(normalized_obs1,
[-1, self.obs_shape_prod])
actions_t_flat = tf.reshape(actions_t, [-1, self.act_shape_prod])
# Return normalization.
# TODO: update this to handle multiple agents if required
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
# Each agents gets its own observation
self.actor_tf = actor(normalized_act_obs0[self.agent_index])
self.target_actor_tf = target_actor(
normalized_act_obs1[self.agent_index])
# Critic gets all observations
self.normalized_critic_tf = critic(normalized_obs0_flat,
actions_t_flat)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf, self.return_range[0],
self.return_range[1]), self.ret_rms)
# need to provide critic() with all actions
act_input_n = self.actions + [] # copy actions
act_input_n[
self.
agent_index] = self.actor_tf # update current agent action using its actor
act_input_n_t = tf.transpose(act_input_n, perm=[1, 0, 2])
act_input_n_t_flat = tf.reshape(act_input_n_t,
[-1, self.act_shape_prod])
self.normalized_critic_with_actor_tf = critic(normalized_obs0_flat,
act_input_n_t_flat,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
# we need to use actions for all agents
target_act_input_n = self.actions + [] # copy actions
target_act_input_n[
self.
agent_index] = self.target_actor_tf # update current agent action using its target actor
target_act_input_n_t = tf.transpose(target_act_input_n, perm=[1, 0, 2])
target_act_input_n_t_flat = tf.reshape(target_act_input_n_t,
[-1, self.act_shape_prod])
Q_obs1 = denormalize(
target_critic(normalized_obs1_flat, target_act_input_n_t_flat),
self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
# param noise is added to actor; hence obs for current agent is required
self.setup_param_noise(normalized_act_obs0[self.agent_index])
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
self.initial_state = None # recurrent architectures not supported yet
def setup_target_network_updates(self):
actor_init_updates, actor_soft_updates = get_target_updates(
self.actor.vars, self.target_actor.vars, self.tau)
critic_init_updates, critic_soft_updates = get_target_updates(
self.critic.vars, self.target_critic.vars, self.tau)
self.target_init_updates = [actor_init_updates, critic_init_updates]
self.target_soft_updates = [actor_soft_updates, critic_soft_updates]
def setup_param_noise(self, normalized_obs0):
assert self.param_noise is not None
# Configure perturbed actor.
param_noise_actor = copy(self.actor)
param_noise_actor.name = 'param_noise_actor'
self.perturbed_actor_tf = param_noise_actor(normalized_obs0)
logger.info('setting up param noise')
self.perturb_policy_ops = get_perturbed_actor_updates(
self.actor, param_noise_actor, self.param_noise_stddev)
# Configure separate copy for stddev adoption.
adaptive_param_noise_actor = copy(self.actor)
adaptive_param_noise_actor.name = 'adaptive_param_noise_actor'
adaptive_actor_tf = adaptive_param_noise_actor(normalized_obs0)
self.perturb_adaptive_policy_ops = get_perturbed_actor_updates(
self.actor, adaptive_param_noise_actor, self.param_noise_stddev)
self.adaptive_policy_distance = tf.sqrt(
tf.reduce_mean(tf.square(self.actor_tf - adaptive_actor_tf)))
def setup_actor_optimizer(self):
logger.info('setting up actor optimizer')
self.actor_loss = -tf.reduce_mean(self.critic_with_actor_tf)
actor_shapes = [
var.get_shape().as_list() for var in self.actor.trainable_vars
]
actor_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
self.actor_grads = U.flatgrad(self.actor_loss,
self.actor.trainable_vars,
clip_norm=self.clip_norm)
self.actor_optimizer = MpiAdam(var_list=self.actor.trainable_vars,
beta1=0.9,
beta2=0.999,
epsilon=1e-08)
def setup_critic_optimizer(self):
logger.info('setting up critic optimizer')
normalized_critic_target_tf = tf.clip_by_value(
normalize(self.critic_target, self.ret_rms), self.return_range[0],
self.return_range[1])
self.critic_loss = tf.reduce_mean(
tf.square(self.normalized_critic_tf - normalized_critic_target_tf))
if self.critic_l2_reg > 0.:
critic_reg_vars = [
var for var in self.critic.trainable_vars
if var.name.endswith('/w:0') and 'output' not in var.name
]
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(
self.critic_l2_reg))
critic_reg = tc.layers.apply_regularization(
tc.layers.l2_regularizer(self.critic_l2_reg),
weights_list=critic_reg_vars)
self.critic_loss += critic_reg
critic_shapes = [
var.get_shape().as_list() for var in self.critic.trainable_vars
]
critic_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
self.critic_grads = U.flatgrad(self.critic_loss,
self.critic.trainable_vars,
clip_norm=self.clip_norm)
self.critic_optimizer = MpiAdam(var_list=self.critic.trainable_vars,
beta1=0.9,
beta2=0.999,
epsilon=1e-08)
def setup_popart(self):
# See https://arxiv.org/pdf/1602.07714.pdf for details.
self.old_std = tf.placeholder(tf.float32, shape=[1], name='old_std')
new_std = self.ret_rms.std
self.old_mean = tf.placeholder(tf.float32, shape=[1], name='old_mean')
new_mean = self.ret_rms.mean
self.renormalize_Q_outputs_op = []
for vs in [self.critic.output_vars, self.target_critic.output_vars]:
assert len(vs) == 2
M, b = vs
assert 'kernel' in M.name
assert 'bias' in b.name
assert M.get_shape()[-1] == 1
assert b.get_shape()[-1] == 1
self.renormalize_Q_outputs_op += [
M.assign(M * self.old_std / new_std)
]
self.renormalize_Q_outputs_op += [
b.assign(
(b * self.old_std + self.old_mean - new_mean) / new_std)
]
def setup_stats(self):
ops = []
names = []
if self.normalize_returns:
ops += [self.ret_rms.mean, self.ret_rms.std]
names += ['ret_rms_mean', 'ret_rms_std']
if self.normalize_observations:
ops += [
tf.reduce_mean(self.obs_rms.mean),
tf.reduce_mean(self.obs_rms.std)
]
names += ['obs_rms_mean', 'obs_rms_std']
ops += [tf.reduce_mean(self.critic_tf)]
names += ['reference_Q_mean']
ops += [reduce_std(self.critic_tf)]
names += ['reference_Q_std']
ops += [tf.reduce_mean(self.critic_with_actor_tf)]
names += ['reference_actor_Q_mean']
ops += [reduce_std(self.critic_with_actor_tf)]
names += ['reference_actor_Q_std']
ops += [tf.reduce_mean(self.actor_tf)]
names += ['reference_action_mean']
ops += [reduce_std(self.actor_tf)]
names += ['reference_action_std']
if self.param_noise:
ops += [tf.reduce_mean(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_mean']
ops += [reduce_std(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_std']
self.stats_ops = ops
self.stats_names = names
# TODO: need to provide all observations to compute q
def step(self, obs, apply_noise=True, compute_Q=True):
if self.param_noise is not None and apply_noise:
actor_tf = self.perturbed_actor_tf
else:
actor_tf = self.actor_tf
feed_dict = {self.obs0: U.adjust_shape(self.obs0, [obs])}
# feed_dict={ph: [data] for ph, data in zip(self.obs0, obs)}
# feed_dict = {self.obs0: [obs]}
# Get the normalized obs first
# norm_obs0 = self.sess.run(self.norm_obs0, feed_dict=feed_dict)
# use the normalized obs for training
# feed_dict = {ph: data for ph, data in zip(self.norm_obs0_ph, norm_obs0)}
if compute_Q:
action, q = self.sess.run([actor_tf, self.critic_with_actor_tf],
feed_dict=feed_dict)
else:
action = self.sess.run(actor_tf, feed_dict=feed_dict)
q = None
if self.action_noise is not None and apply_noise:
noise = self.action_noise()
assert noise.shape == action[0].shape
action += noise
action = np.clip(action, self.action_range[0], self.action_range[1])
return action[0], q, None, None
# TODO: test this
# Computing this every time step may slow things
def get_q_value(self, obs_n, act_n):
# assuming computing q value for one state; hence need [] around data
feed_dict = {ph: [data] for ph, data in zip(self.obs0, obs_n)}
act_dict = {ph: [data] for ph, data in zip(self.actions, act_n)}
feed_dict.update(act_dict)
q = self.sess.run(self.critic_with_actor_tf, feed_dict=feed_dict)
return q
def store_transition(self, obs0, action, reward, obs1, terminal1):
reward *= self.reward_scale
# print(action)
B = obs0.shape[0]
a_idx = self.agent_index
for b in range(B):
self.memory.append(obs0[b][a_idx], action[b][a_idx],
reward[b][a_idx], obs1[b][a_idx],
terminal1[b][a_idx])
# NOTE: calling update for each agent is ok, since the mean and std are uneffected
# this is because the same obs are repeated num_agent times, which dont affect value
if self.normalize_observations:
# provide full obs for obs_rms update
obs0_shape = (len(obs0[b]), ) + obs0[b][a_idx].shape
assert obs0_shape == (self.num_agents, ) + obs0[b][a_idx].shape
self.obs_rms.update(np.array([obs0[b]]))
# TODO: not using this right now
def update_obs_rms(self, obs0):
if not self.normalize_observations:
return
B = obs0.shape[0]
for b in range(B):
# provide full obs for obs_rms update
self.obs_rms.update(np.array([obs0[b]]))
return
def train(self, agents):
# generate indices to access batches from all agents
replay_sample_index = self.memory.generate_index(self.batch_size)
# collect replay sample from all agents
obs0_n = []
obs1_n = []
rewards_n = []
act_n = []
terminals1_n = []
for i in range(self.num_agents):
# Get a batch.
batch = agents[i].memory.sample(batch_size=self.batch_size,
index=replay_sample_index)
obs0_n.append(batch['obs0'])
obs1_n.append(batch['obs1'])
act_n.append(batch['actions'])
# rewards_n.append(batch['rewards'])
# terminals1_n.append(batch['terminals1'])
batch = self.memory.sample(batch_size=self.batch_size,
index=replay_sample_index)
# fill placeholders in obs1 with corresponding obs from each agent's replay buffer
# self.obs1 and obs1_n are lists of size num_agents
# feed_dict={ph: data for ph, data in zip(self.obs1, obs1_n)}
feed_dict = {self.obs1: obs1_n}
# TODO: find a better way to do this
# Get the normalized obs first
# norm_obs1 = self.sess.run(self.norm_obs1, feed_dict=feed_dict)
# use the normalized obs for training
# feed_dict = {self.norm_obs1_ph: norm_obs1}
# feed_dict = {ph: data for ph, data in zip(self.norm_obs1_ph, norm_obs1)}
# actions required for critic
act_dict = {ph: data for ph, data in zip(self.actions, act_n)}
feed_dict.update(act_dict)
feed_dict.update({self.rewards: batch['rewards']})
feed_dict.update(
{self.terminals1: batch['terminals1'].astype('float32')})
if self.normalize_returns and self.enable_popart:
old_mean, old_std, target_Q = self.sess.run(
[self.ret_rms.mean, self.ret_rms.std, self.target_Q],
feed_dict=feed_dict)
# old_mean, old_std, target_Q = self.sess.run([self.ret_rms.mean, self.ret_rms.std, self.target_Q], feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
self.ret_rms.update(target_Q.flatten())
self.sess.run(self.renormalize_Q_outputs_op,
feed_dict={
self.old_std: np.array([old_std]),
self.old_mean: np.array([old_mean]),
})
# Run sanity check. Disabled by default since it slows down things considerably.
# print('running sanity check')
# target_Q_new, new_mean, new_std = self.sess.run([self.target_Q, self.ret_rms.mean, self.ret_rms.std], feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
# print(target_Q_new, target_Q, new_mean, new_std)
# assert (np.abs(target_Q - target_Q_new) < 1e-3).all()
else:
target_Q = self.sess.run(self.target_Q, feed_dict=feed_dict)
# target_Q = self.sess.run(self.target_Q, feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
# Get all gradients and perform a synced update.
ops = [
self.actor_grads, self.actor_loss, self.critic_grads,
self.critic_loss
]
# generate feed_dict for multiple observations and actions
# feed_dict={ph: data for ph, data in zip(self.obs0, obs0_n)}
feed_dict = {self.obs0: obs0_n}
# Get the normalized obs first
# norm_obs0 = self.sess.run(self.norm_obs0, feed_dict=feed_dict)
# use the normalized obs for training
# feed_dict = {self.norm_obs0_ph: norm_obs0}
# feed_dict = {ph: data for ph, data in zip(self.norm_obs0_ph, norm_obs0)}
# act_dict={ph: data for ph, data in zip(self.actions, act_n)}
feed_dict.update(act_dict)
feed_dict.update({self.critic_target: target_Q})
actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(
ops, feed_dict=feed_dict)
# actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(ops, feed_dict={
# self.obs0: batch['obs0'],
# self.actions: batch['actions'],
# self.critic_target: target_Q,
# })
self.actor_optimizer.update(actor_grads, stepsize=self.actor_lr)
self.critic_optimizer.update(critic_grads, stepsize=self.critic_lr)
return critic_loss, actor_loss
def initialize(self, sess):
self.sess = sess
def agent_initialize(self, sess):
self.actor_optimizer.sync()
self.critic_optimizer.sync()
self.sess.run(self.target_init_updates)
# setup saving and loading functions
self.save = functools.partial(save_variables, sess=sess)
self.load = functools.partial(load_variables, sess=sess)
def update_target_net(self):
self.sess.run(self.target_soft_updates)
def get_stats(self, agents):
if self.stats_sample is None:
replay_sample_index = self.memory.generate_index(self.batch_size)
# collect replay sample from all agents
obs0_n, act_n = [], []
for i in range(self.num_agents):
batch = agents[i].memory.sample(batch_size=self.batch_size,
index=replay_sample_index)
obs0_n.append(batch['obs0'])
act_n.append(batch['actions'])
# generate feed_dict for multiple observations and actions
# feed_dict={ph: data for ph, data in zip(self.obs0, obs0_n)}
feed_dict = {self.obs0: obs0_n}
# Get the normalized obs first
# norm_obs0 = self.sess.run(self.norm_obs0, feed_dict=feed_dict)
# use the normalized obs for training
# feed_dict = {self.norm_obs0_ph: norm_obs0}
# feed_dict = {ph: data for ph, data in zip(self.norm_obs0_ph, norm_obs0)}
actions_dict = {ph: data for ph, data in zip(self.actions, act_n)}
feed_dict.update(actions_dict)
# Get a sample and keep that fixed for all further computations.
# This allows us to estimate the change in value for the same set of inputs.
self.stats_sample = feed_dict
values = self.sess.run(self.stats_ops, feed_dict=self.stats_sample)
names = self.stats_names[:]
assert len(names) == len(values)
stats = dict(zip(names, values))
if self.param_noise is not None:
stats = {**stats, **self.param_noise.get_stats()}
return stats
def adapt_param_noise(self, agents):
try:
from mpi4py import MPI
except ImportError:
MPI = None
if self.param_noise is None:
return 0.
# Perturb a separate copy of the policy to adjust the scale for the next "real" perturbation.
replay_sample_index = self.memory.generate_index(self.batch_size)
obs0_n = []
for i in range(self.num_agents):
batch = agents[i].memory.sample(batch_size=self.batch_size,
index=replay_sample_index)
obs0_n.append(batch['obs0'])
# feed_dict={ph: data for ph, data in zip(self.obs0, obs0_n)}
feed_dict = {self.obs0: obs0_n}
# Get the normalized obs first
# norm_obs0 = self.sess.run(self.norm_obs0, feed_dict=feed_dict)
# use the normalized obs for training
# feed_dict = {self.norm_obs0_ph: norm_obs0}
# feed_dict = {ph: data for ph, data in zip(self.norm_obs0_ph, norm_obs0)}
feed_dict.update(
{self.param_noise_stddev: self.param_noise.current_stddev})
self.sess.run(self.perturb_adaptive_policy_ops,
feed_dict={
self.param_noise_stddev:
self.param_noise.current_stddev,
})
distance = self.sess.run(self.adaptive_policy_distance,
feed_dict=feed_dict)
# distance = self.sess.run(self.adaptive_policy_distance, feed_dict={
# self.obs0: batch['obs0'],
# self.param_noise_stddev: self.param_noise.current_stddev,
# })
if MPI is not None:
mean_distance = MPI.COMM_WORLD.allreduce(
distance, op=MPI.SUM) / MPI.COMM_WORLD.Get_size()
else:
mean_distance = distance
if MPI is not None:
mean_distance = MPI.COMM_WORLD.allreduce(
distance, op=MPI.SUM) / MPI.COMM_WORLD.Get_size()
else:
mean_distance = distance
self.param_noise.adapt(mean_distance)
return mean_distance
def reset(self):
# Reset internal state after an episode is complete.
if self.action_noise is not None:
self.action_noise.reset()
if self.param_noise is not None:
self.sess.run(self.perturb_policy_ops,
feed_dict={
self.param_noise_stddev:
self.param_noise.current_stddev,
})
def _init(self, ob_space, ac_space, hid_size, num_hid_layers, gaussian_fixed_var=True, obs_name='ob',\
obrms=True, final_std=0.01, init_logstd=0.0, observation_permutation=None,action_permutation=None, soft_mirror=False):
assert isinstance(ob_space, gym.spaces.Box)
obs_perm_mat = np.zeros(
(len(observation_permutation), len(observation_permutation)),
dtype=np.float32)
self.obs_perm_mat = obs_perm_mat
for i, perm in enumerate(observation_permutation):
obs_perm_mat[i][int(np.abs(perm))] = np.sign(perm)
if isinstance(ac_space, gym.spaces.Box):
act_perm_mat = np.zeros(
(len(action_permutation), len(action_permutation)),
dtype=np.float32)
self.act_perm_mat = act_perm_mat
for i, perm in enumerate(action_permutation):
self.act_perm_mat[i][int(np.abs(perm))] = np.sign(perm)
elif isinstance(ac_space, gym.spaces.MultiDiscrete):
total_dim = int(np.sum(ac_space.nvec))
dim_index = np.concatenate([[0], np.cumsum(ac_space.nvec)])
act_perm_mat = np.zeros((total_dim, total_dim), dtype=np.float32)
self.act_perm_mat = act_perm_mat
for i, perm in enumerate(action_permutation):
perm_mat = np.identity(ac_space.nvec[i])
if np.sign(perm) < 0:
perm_mat = np.flipud(perm_mat)
self.act_perm_mat[
dim_index[i]:dim_index[i] + ac_space.nvec[i],
dim_index[int(np.abs(perm)
)]:dim_index[int(np.abs(perm))] +
ac_space.nvec[int(np.abs(perm))]] = perm_mat
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
print(self.pdtype)
print([sequence_length] + list(ob_space.shape))
ob = U.get_placeholder(name=obs_name,
dtype=tf.float32,
shape=[sequence_length] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std, -5.0,
5.0)
mirror_ob = tf.matmul(ob, obs_perm_mat)
mirror_obz = tf.clip_by_value(
(mirror_ob - self.ob_rms.mean) / self.ob_rms.std, -5.0, 5.0)
if not obrms:
obz = ob
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
dense(last_out,
hid_size,
"vffc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
self.vpred = dense(last_out,
1,
"vffinal",
weight_init=U.normc_initializer(1.0))[:, 0]
if isinstance(ac_space, gym.spaces.Box):
pol_net = GenericFF('pol_net', ob_space.shape[0], [],
pdtype.param_shape()[0] // 2, hid_size,
num_hid_layers)
elif isinstance(ac_space, gym.spaces.MultiDiscrete):
pol_net = GenericFF('pol_net', ob_space.shape[0], [],
pdtype.param_shape()[0], hid_size,
num_hid_layers)
orig_out = pol_net.get_output_tensor(obz, None, tf.nn.tanh)
mirr_out = tf.matmul(
pol_net.get_output_tensor(mirror_obz, None, tf.nn.tanh),
act_perm_mat)
if not soft_mirror:
mean = orig_out + mirr_out
else:
mean = orig_out
self.additional_loss = tf.reduce_mean(
tf.abs(orig_out - mirr_out)) * 1.0
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
logstd = tf.get_variable(
name="logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.constant_initializer(init_logstd))
pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
pdparam = mean
self.pd = pdtype.pdfromflat(pdparam)
self.state_in = []
self.state_out = []
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self._act = U.function([stochastic, ob], [ac, self.vpred])
def __init__(self, actor, critic, experts, obs_dim, memory, observation_shape, action_shape,
expert_is_np=False,
param_noise=None, action_noise=None,
gamma=0.95, tau=0.001, normalize_returns=False, enable_popart=False, normalize_observations=True,
batch_size=128, observation_range=(-5., 5.), action_range=(-1., 1.), return_range=(-np.inf, np.inf),
critic_l2_reg=0., actor_lr=1e-4, critic_lr=1e-3, clip_norm=None, reward_scale=1.):
# Inputs.
self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs0')
self.obs1 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs1')
self.terminals1 = tf.placeholder(tf.float32, shape=(None, 1), name='terminals1')
self.rewards = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions = tf.placeholder(tf.float32, shape=(None,) + action_shape, name='actions')
self.critic_target = tf.placeholder(tf.float32, shape=(None, 1), name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32, shape=(), name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = copy(actor)
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
self.experts = experts
self.obs_dim = obs_dim
# self.critic_obs0 = self.experts[0].obs0
# self.critic_obs1 = self.experts[0].obs1
# self.critic_actor = self.experts[0].use_tf_actor
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(self.actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
expert0_normalize_obs0 = [tf.clip_by_value(normalize(self.obs0[:, :self.obs_dim], self.experts[i].obs_rms),
self.observation_range[0], self.observation_range[1]) for i in range(len(self.experts))]
expert_qv0 = tf.squeeze(tf.stack([experts[i].critic(expert0_normalize_obs0[i], self.actions)\
for i in range(len(self.experts))]), axis=2)
# expert_qv0 = tf.Print(expert_qv0, [expert_qv0], '>>>> qv0 :', summarize=10)
expert_qv0 = tf.reduce_sum(self.obs0[:, self.obs_dim:] * tf.transpose(expert_qv0), axis=1)
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = self.actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions, tf.stop_gradient(expert_qv0))
self.critic_tf = tf.clip_by_value(self.normalized_critic_tf, self.return_range[0], self.return_range[1])
expert_qv0_with_actor_tf = tf.squeeze(tf.stack([experts[i].critic(expert0_normalize_obs0[i], self.actor_tf) for i in range(len(self.experts))]),
axis=2)
expert_qv0_with_actor_tf = tf.reduce_sum(self.obs0[:, self.obs_dim:] * tf.transpose(expert_qv0_with_actor_tf), axis=1)
self.normalized_critic_with_actor_tf = critic(normalized_obs0, self.actor_tf, tf.stop_gradient(expert_qv0_with_actor_tf))
self.critic_with_actor_tf = denormalize(tf.clip_by_value(self.normalized_critic_with_actor_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
action1 = target_actor(normalized_obs1)
expert0_normalize_obs1 = [tf.clip_by_value(normalize(self.obs1[:, :self.obs_dim], self.experts[i].obs_rms),
self.observation_range[0], self.observation_range[1]) for i in range(len(self.experts))]
expert_qv1 = tf.squeeze(tf.stack([(experts[i].critic(expert0_normalize_obs1[i], action1)) for i in range(len(self.experts))]), axis=2)
expert_qv1 = tf.reduce_sum(self.obs1[:, self.obs_dim:] * tf.transpose(expert_qv1), axis=1)
self.Q_obs1 = target_critic(normalized_obs1, action1, tf.stop_gradient(expert_qv1))
# self.Q_obs1 = tf.Print(self.Q_obs1, [self.Q_obs1], '>>>> Q :', summarize=10)
# self.terminals1 = tf.Print(self.terminals1, [self.terminals1], '>>>> terminal :', summarize=10)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * self.Q_obs1
self.expert_qv1 = expert_qv1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
self.initial_state = None # recurrent architectures not supported yet
class MlpPolicy(object):
recurrent = False
def __init__(self, name, *args, **kwargs):
self.scope = name
with tf.variable_scope(name, reuse=tf.AUTO_REUSE):
self._init(*args, **kwargs)
def _init(self,
ob_space,
ac_space,
hid_size,
num_hid_layers,
gaussian_fixed_var=False,
popart=True):
assert isinstance(ob_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[None] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
with tf.variable_scope("popart"):
self.v_rms = RunningMeanStd(shape=[1])
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std, -5.0,
5.0)
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
dense(last_out,
hid_size,
"vffc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
self.norm_vpred = dense(last_out,
1,
"vffinal",
weight_init=U.normc_initializer(1.0))[:, 0]
if popart:
self.vpred = denormalize(self.norm_vpred, self.v_rms)
else:
self.vpred = self.norm_vpred
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
dense(last_out,
hid_size,
"polfc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = dense(last_out,
pdtype.param_shape()[0] // 2, "polfinal",
U.normc_initializer(0.01))
logstd = tf.get_variable(name="logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.zeros_initializer())
pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
pdparam = dense(last_out,
pdtype.param_shape()[0], "polfinal",
U.normc_initializer(0.01))
self.pd = pdtype.pdfromflat(pdparam)
self.state_in = []
self.state_out = []
# change for BC
stochastic = U.get_placeholder(name="stochastic",
dtype=tf.bool,
shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self.ac = ac
self._act = U.function([stochastic, ob], [ac, self.vpred])
self.use_popart = popart
if popart:
self.init_popart()
ret = tf.placeholder(tf.float32, [None])
vferr = tf.reduce_mean(tf.square(self.vpred - ret))
self.vlossandgrad = U.function([ob, ret],
U.flatgrad(vferr,
self.get_vf_variable()))
def init_popart(self):
old_std = tf.placeholder(tf.float32, shape=[1], name='old_std')
new_std = self.v_rms.std
old_mean = tf.placeholder(tf.float32, shape=[1], name='old_mean')
new_mean = self.v_rms.mean
renormalize_Q_outputs_op = []
vs = self.output_vars
M, b = vs
renormalize_Q_outputs_op += [M.assign(M * old_std / new_std)]
renormalize_Q_outputs_op += [
b.assign((b * old_std + old_mean - new_mean) / new_std)
]
self.renorm_v = U.function([old_std, old_mean], [],
updates=renormalize_Q_outputs_op)
def act(self, stochastic, ob):
ac1, vpred1 = self._act(stochastic, ob[None])
return ac1[0], vpred1[0]
def get_variables(self):
return tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, self.scope)
def get_trainable_variables(self):
return tf.trainable_variables(self.scope)
def get_initial_state(self):
return []
def get_vf_variable(self):
return tf.trainable_variables(self.scope + "/vf")
def update_popart(self, v_targets):
old_mean, old_std = U.get_session().run(
[self.v_rms.mean, self.v_rms.std])
self.v_rms.update(v_targets)
self.renorm_v(old_std, old_mean)
@property
def output_vars(self):
output_vars = [
var for var in self.get_vf_variable() if 'vffinal' in var.name
]
return output_vars
def save_policy(self, name):
U.save_variables(name, variables=self.get_variables())
def load_policy(self, name):
U.load_variables(name, variables=self.get_variables())
def __init__(self,
actor,
critic,
memory,
observation_shape,
action_shape,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.):
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.observation_shape = observation_shape
self.critic = critic
self.actor = actor
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
self.actor_lr = tf.constant(actor_lr)
self.critic_lr = tf.constant(critic_lr)
# Observation normalization.
if self.normalize_observations:
with tf.name_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
# Return normalization.
if self.normalize_returns:
with tf.name_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
self.target_critic = Critic(actor.nb_actions,
observation_shape,
name='target_critic',
network=critic.network,
**critic.network_kwargs)
self.target_actor = Actor(actor.nb_actions,
observation_shape,
name='target_actor',
network=actor.network,
**actor.network_kwargs)
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise()
if MPI is not None:
comm = MPI.COMM_WORLD
self.actor_optimizer = MpiAdamOptimizer(
comm, self.actor.trainable_variables)
self.critic_optimizer = MpiAdamOptimizer(
comm, self.critic.trainable_variables)
else:
self.actor_optimizer = tf.keras.optimizers.Adam(
learning_rate=actor_lr)
self.critic_optimizer = tf.keras.optimizers.Adam(
learning_rate=critic_lr)
logger.info('setting up actor optimizer')
actor_shapes = [
var.get_shape().as_list() for var in self.actor.trainable_variables
]
actor_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
logger.info('setting up critic optimizer')
critic_shapes = [
var.get_shape().as_list()
for var in self.critic.trainable_variables
]
critic_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
if self.critic_l2_reg > 0.:
critic_reg_vars = []
for layer in self.critic.network_builder.layers[1:]:
critic_reg_vars.append(layer.kernel)
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(
self.critic_l2_reg))
logger.info('setting up critic target updates ...')
for var, target_var in zip(self.critic.variables,
self.target_critic.variables):
logger.info(' {} <- {}'.format(target_var.name, var.name))
logger.info('setting up actor target updates ...')
for var, target_var in zip(self.actor.variables,
self.target_actor.variables):
logger.info(' {} <- {}'.format(target_var.name, var.name))
if self.param_noise:
logger.info('setting up param noise')
for var, perturbed_var in zip(self.actor.variables,
self.perturbed_actor.variables):
if var in actor.perturbable_vars:
logger.info(' {} <- {} + noise'.format(
perturbed_var.name, var.name))
else:
logger.info(' {} <- {}'.format(perturbed_var.name,
var.name))
for var, perturbed_var in zip(
self.actor.variables,
self.perturbed_adaptive_actor.variables):
if var in actor.perturbable_vars:
logger.info(' {} <- {} + noise'.format(
perturbed_var.name, var.name))
else:
logger.info(' {} <- {}'.format(perturbed_var.name,
var.name))
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.initial_state = None # recurrent architectures not supported yet
def _init(self, ob_space, ac_space, hid_size, num_hid_layers, gaussian_fixed_var=True):
assert isinstance(ob_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None # None: no recurrent network, Int num: MLP
ob = U.get_placeholder(name="ob", dtype=tf.float32, shape=[sequence_length] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std, -5.0, 5.0)
share_layer = obz
for i in range(num_hid_layers):
share_layer = tf.nn.tanh(tf.layers.dense(share_layer, hid_size, name="fc%i" % (i + 1),
kernel_initializer=U.normc_initializer(1.0)))
self.lstm_input = tf.expand_dims(share_layer, [0])
step_size = tf.shape(obz)[:1]
# add the recurrent layers or combined with one Mlp
lstm_cell = tf.contrib.rnn.BasicLSTMCell(hid_size, state_is_tuple=True)
c_init = np.zeros((1, lstm_cell.state_size.c), np.float32)
h_init = np.zeros((1, lstm_cell.state_size.h), np.float32)
self.lstm_state_init = [c_init, h_init]
c_in = U.get_placeholder(name="cin", dtype=tf.float32, shape=[1, lstm_cell.state_size.c])
h_in = U.get_placeholder(name="hin", dtype=tf.float32, shape=[1, lstm_cell.state_size.h])
self.state_in = [c_in, h_in]
lstm_state_in = tf.contrib.rnn.LSTMStateTuple(c_in, h_in)
self.lstm_out1, lstm_state_out = tf.nn.dynamic_rnn(lstm_cell, self.lstm_input,
initial_state=lstm_state_in,
sequence_length=step_size,
time_major=False)
lstm_c, lstm_h = lstm_state_out
self.state_out = [lstm_c[:1, :], lstm_h[:1, :]]
self.lstm_out = tf.reshape(self.lstm_out1, [-1, hid_size])
with tf.variable_scope('vf'):
self.last_out = self.lstm_out
# for i in range(num_hid_layers):
# self.last_out = tf.nn.tanh(tf.layers.dense(self.last_out, hid_size, name="fc%i"%(i+1), kernel_initializer=U.normc_initializer(1.0)))
self.vpred = tf.layers.dense(self.last_out, 1, name='final', kernel_initializer=U.normc_initializer(1.0))[:,0]
with tf.variable_scope('pol'):
self.last_out_pol = self.lstm_out
# for i in range(num_hid_layers):
# self.last_out_pol = tf.nn.tanh(tf.layers.dense(self.last_out_pol, hid_size, name='fc%i'%(i+1), kernel_initializer=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = tf.layers.dense(self.last_out_pol, pdtype.param_shape()[0]//2, name='final', kernel_initializer=U.normc_initializer(0.01))
logstd = tf.get_variable(name="logstd", shape=[1, pdtype.param_shape()[0]//2], initializer=tf.zeros_initializer())
self.pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
self.pdparam = tf.layers.dense(self.last_out_pol, pdtype.param_shape()[0], name='final', kernel_initializer=U.normc_initializer(0.01))
self.pd = pdtype.pdfromflat(self.pdparam)
# self.state_in = []
# self.state_out = []
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self._act = U.function([stochastic, ob, self.state_in[0], self.state_in[1]], [ac, self.vpred, self.state_out])
class DDPG(tf.Module):
def __init__(self,
actor,
critic,
memory,
observation_shape,
action_shape,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.):
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.observation_shape = observation_shape
self.critic = critic
self.actor = actor
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
self.actor_lr = tf.constant(actor_lr)
self.critic_lr = tf.constant(critic_lr)
# Observation normalization.
if self.normalize_observations:
with tf.name_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
# Return normalization.
if self.normalize_returns:
with tf.name_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
self.target_critic = Critic(actor.nb_actions,
observation_shape,
name='target_critic',
network=critic.network,
**critic.network_kwargs)
self.target_actor = Actor(actor.nb_actions,
observation_shape,
name='target_actor',
network=actor.network,
**actor.network_kwargs)
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise()
if MPI is not None:
comm = MPI.COMM_WORLD
self.actor_optimizer = MpiAdamOptimizer(
comm, self.actor.trainable_variables)
self.critic_optimizer = MpiAdamOptimizer(
comm, self.critic.trainable_variables)
else:
self.actor_optimizer = tf.keras.optimizers.Adam(
learning_rate=actor_lr)
self.critic_optimizer = tf.keras.optimizers.Adam(
learning_rate=critic_lr)
logger.info('setting up actor optimizer')
actor_shapes = [
var.get_shape().as_list() for var in self.actor.trainable_variables
]
actor_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
logger.info('setting up critic optimizer')
critic_shapes = [
var.get_shape().as_list()
for var in self.critic.trainable_variables
]
critic_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
if self.critic_l2_reg > 0.:
critic_reg_vars = []
for layer in self.critic.network_builder.layers[1:]:
critic_reg_vars.append(layer.kernel)
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(
self.critic_l2_reg))
logger.info('setting up critic target updates ...')
for var, target_var in zip(self.critic.variables,
self.target_critic.variables):
logger.info(' {} <- {}'.format(target_var.name, var.name))
logger.info('setting up actor target updates ...')
for var, target_var in zip(self.actor.variables,
self.target_actor.variables):
logger.info(' {} <- {}'.format(target_var.name, var.name))
if self.param_noise:
logger.info('setting up param noise')
for var, perturbed_var in zip(self.actor.variables,
self.perturbed_actor.variables):
if var in actor.perturbable_vars:
logger.info(' {} <- {} + noise'.format(
perturbed_var.name, var.name))
else:
logger.info(' {} <- {}'.format(perturbed_var.name,
var.name))
for var, perturbed_var in zip(
self.actor.variables,
self.perturbed_adaptive_actor.variables):
if var in actor.perturbable_vars:
logger.info(' {} <- {} + noise'.format(
perturbed_var.name, var.name))
else:
logger.info(' {} <- {}'.format(perturbed_var.name,
var.name))
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.initial_state = None # recurrent architectures not supported yet
def setup_param_noise(self):
assert self.param_noise is not None
# Configure perturbed actor.
self.perturbed_actor = Actor(self.actor.nb_actions,
self.observation_shape,
name='param_noise_actor',
network=self.actor.network,
**self.actor.network_kwargs)
# Configure separate copy for stddev adoption.
self.perturbed_adaptive_actor = Actor(
self.actor.nb_actions,
self.observation_shape,
name='adaptive_param_noise_actor',
network=self.actor.network,
**self.actor.network_kwargs)
def setup_popart(self):
# See https://arxiv.org/pdf/1602.07714.pdf for details.
for vs in [self.critic.output_vars, self.target_critic.output_vars]:
assert len(vs) == 2
M, b = vs
assert 'kernel' in M.name
assert 'bias' in b.name
assert M.get_shape()[-1] == 1
assert b.get_shape()[-1] == 1
@tf.function
def step(self, obs, apply_noise=True, compute_Q=True):
normalized_obs = tf.clip_by_value(normalize(obs, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
actor_tf = self.actor(normalized_obs)
if self.param_noise is not None and apply_noise:
action = self.perturbed_actor(normalized_obs)
else:
action = actor_tf
if compute_Q:
normalized_critic_with_actor_tf = self.critic(
normalized_obs, actor_tf)
q = denormalize(
tf.clip_by_value(normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
else:
q = None
if self.action_noise is not None and apply_noise:
noise = self.action_noise()
action += noise
action = tf.clip_by_value(action, self.action_range[0],
self.action_range[1])
return action, q, None, None
def store_transition(self, obs0, action, reward, obs1, terminal1):
reward *= self.reward_scale
B = obs0.shape[0]
for b in range(B):
self.memory.append(obs0[b], action[b], reward[b], obs1[b],
terminal1[b])
if self.normalize_observations:
self.obs_rms.update(np.array([obs0[b]]))
def train(self):
batch = self.memory.sample(batch_size=self.batch_size)
obs0, obs1 = tf.constant(batch['obs0']), tf.constant(batch['obs1'])
actions, rewards, terminals1 = tf.constant(
batch['actions']), tf.constant(batch['rewards']), tf.constant(
batch['terminals1'], dtype=tf.float32)
normalized_obs0, target_Q = self.compute_normalized_obs0_and_target_Q(
obs0, obs1, rewards, terminals1)
if self.normalize_returns and self.enable_popart:
old_mean = self.ret_rms.mean
old_std = self.ret_rms.std
self.ret_rms.update(target_Q.flatten())
# renormalize Q outputs
new_mean = self.ret_rms.mean
new_std = self.ret_rms.std
for vs in [
self.critic.output_vars, self.target_critic.output_vars
]:
kernel, bias = vs
kernel.assign(kernel * old_std / new_std)
bias.assign((bias * old_std + old_mean - new_mean) / new_std)
actor_grads, actor_loss = self.get_actor_grads(normalized_obs0)
critic_grads, critic_loss = self.get_critic_grads(
normalized_obs0, actions, target_Q)
if MPI is not None:
self.actor_optimizer.apply_gradients(actor_grads, self.actor_lr)
self.critic_optimizer.apply_gradients(critic_grads, self.critic_lr)
else:
self.actor_optimizer.apply_gradients(
zip(actor_grads, self.actor.trainable_variables))
self.critic_optimizer.apply_gradients(
zip(critic_grads, self.critic.trainable_variables))
return critic_loss, actor_loss
@tf.function
def compute_normalized_obs0_and_target_Q(self, obs0, obs1, rewards,
terminals1):
normalized_obs0 = tf.clip_by_value(normalize(obs0, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(obs1, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
Q_obs1 = denormalize(
self.target_critic(normalized_obs1,
self.target_actor(normalized_obs1)),
self.ret_rms)
target_Q = rewards + (1. - terminals1) * self.gamma * Q_obs1
return normalized_obs0, target_Q
@tf.function
def get_actor_grads(self, normalized_obs0):
with tf.GradientTape() as tape:
actor_tf = self.actor(normalized_obs0)
normalized_critic_with_actor_tf = self.critic(
normalized_obs0, actor_tf)
critic_with_actor_tf = denormalize(
tf.clip_by_value(normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
actor_loss = -tf.reduce_mean(critic_with_actor_tf)
actor_grads = tape.gradient(actor_loss, self.actor.trainable_variables)
if self.clip_norm:
actor_grads = [
tf.clip_by_norm(grad, clip_norm=self.clip_norm)
for grad in actor_grads
]
if MPI is not None:
actor_grads = tf.concat(
[tf.reshape(g, (-1, )) for g in actor_grads], axis=0)
return actor_grads, actor_loss
@tf.function
def get_critic_grads(self, normalized_obs0, actions, target_Q):
with tf.GradientTape() as tape:
normalized_critic_tf = self.critic(normalized_obs0, actions)
normalized_critic_target_tf = tf.clip_by_value(
normalize(target_Q, self.ret_rms), self.return_range[0],
self.return_range[1])
critic_loss = tf.reduce_mean(
tf.square(normalized_critic_tf - normalized_critic_target_tf))
# The first is input layer, which is ignored here.
if self.critic_l2_reg > 0.:
# Ignore the first input layer.
for layer in self.critic.network_builder.layers[1:]:
# The original l2_regularizer takes half of sum square.
critic_loss += (self.critic_l2_reg / 2.) * tf.reduce_sum(
tf.square(layer.kernel))
critic_grads = tape.gradient(critic_loss,
self.critic.trainable_variables)
if self.clip_norm:
critic_grads = [
tf.clip_by_norm(grad, clip_norm=self.clip_norm)
for grad in critic_grads
]
if MPI is not None:
critic_grads = tf.concat(
[tf.reshape(g, (-1, )) for g in critic_grads], axis=0)
return critic_grads, critic_loss
def initialize(self):
if MPI is not None:
sync_from_root(self.actor.trainable_variables +
self.critic.trainable_variables)
self.target_actor.set_weights(self.actor.get_weights())
self.target_critic.set_weights(self.critic.get_weights())
@tf.function
def update_target_net(self):
for var, target_var in zip(self.actor.variables,
self.target_actor.variables):
target_var.assign((1. - self.tau) * target_var + self.tau * var)
for var, target_var in zip(self.critic.variables,
self.target_critic.variables):
target_var.assign((1. - self.tau) * target_var + self.tau * var)
def get_stats(self):
if self.stats_sample is None:
# Get a sample and keep that fixed for all further computations.
# This allows us to estimate the change in value for the same set of inputs.
self.stats_sample = self.memory.sample(batch_size=self.batch_size)
obs0 = self.stats_sample['obs0']
actions = self.stats_sample['actions']
normalized_obs0 = tf.clip_by_value(normalize(obs0, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_critic_tf = self.critic(normalized_obs0, actions)
critic_tf = denormalize(
tf.clip_by_value(normalized_critic_tf, self.return_range[0],
self.return_range[1]), self.ret_rms)
actor_tf = self.actor(normalized_obs0)
normalized_critic_with_actor_tf = self.critic(normalized_obs0,
actor_tf)
critic_with_actor_tf = denormalize(
tf.clip_by_value(normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
stats = {}
if self.normalize_returns:
stats['ret_rms_mean'] = self.ret_rms.mean
stats['ret_rms_std'] = self.ret_rms.std
if self.normalize_observations:
stats['obs_rms_mean'] = tf.reduce_mean(self.obs_rms.mean)
stats['obs_rms_std'] = tf.reduce_mean(self.obs_rms.std)
stats['reference_Q_mean'] = tf.reduce_mean(critic_tf)
stats['reference_Q_std'] = reduce_std(critic_tf)
stats['reference_actor_Q_mean'] = tf.reduce_mean(critic_with_actor_tf)
stats['reference_actor_Q_std'] = reduce_std(critic_with_actor_tf)
stats['reference_action_mean'] = tf.reduce_mean(actor_tf)
stats['reference_action_std'] = reduce_std(actor_tf)
if self.param_noise:
perturbed_actor_tf = self.perturbed_actor(normalized_obs0)
stats['reference_perturbed_action_mean'] = tf.reduce_mean(
perturbed_actor_tf)
stats['reference_perturbed_action_std'] = reduce_std(
perturbed_actor_tf)
stats.update(self.param_noise.get_stats())
return stats
def adapt_param_noise(self, obs0):
try:
from mpi4py import MPI
except ImportError:
MPI = None
if self.param_noise is None:
return 0.
mean_distance = self.get_mean_distance(obs0).numpy()
if MPI is not None:
mean_distance = MPI.COMM_WORLD.allreduce(
mean_distance, op=MPI.SUM) / MPI.COMM_WORLD.Get_size()
self.param_noise.adapt(mean_distance)
return mean_distance
@tf.function
def get_mean_distance(self, obs0):
# Perturb a separate copy of the policy to adjust the scale for the next "real" perturbation.
update_perturbed_actor(self.actor, self.perturbed_adaptive_actor,
self.param_noise.current_stddev)
normalized_obs0 = tf.clip_by_value(normalize(obs0, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
actor_tf = self.actor(normalized_obs0)
adaptive_actor_tf = self.perturbed_adaptive_actor(normalized_obs0)
mean_distance = tf.sqrt(
tf.reduce_mean(tf.square(actor_tf - adaptive_actor_tf)))
return mean_distance
def reset(self):
# Reset internal state after an episode is complete.
if self.action_noise is not None:
self.action_noise.reset()
if self.param_noise is not None:
update_perturbed_actor(self.actor, self.perturbed_actor,
self.param_noise.current_stddev)
def __init__(self,
actor,
critic,
memory,
observation_shape,
action_shape,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
adaptive_param_noise=True,
adaptive_param_noise_policy_threshold=.1,
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.,
td3_variant=False,
td3_policy_freq=1,
td3_policy_noise=0.0,
td3_noise_clip=0.5):
# Inputs.
self.obs0 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs0')
self.obs1 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs1')
self.terminals1 = tf.placeholder(tf.float32,
shape=(None, 1),
name='terminals1')
self.rewards = tf.placeholder(tf.float32,
shape=(None, 1),
name='rewards')
self.actions = tf.placeholder(tf.float32,
shape=(None, ) + action_shape,
name='actions')
self.critic_target = tf.placeholder(tf.float32,
shape=(None, 1),
name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32,
shape=(),
name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
#추가된 내용
#parameters for using TD3 variant of DDPG
#https://arxiv.org/abs/1802.09477
self.td3_variant = td3_variant
self.td3_policy_freq = td3_policy_freq
self.td3_policy_noise = td3_policy_noise
self.td3_noise_clip = td3_noise_clip
#노말라이제이션 코드 her에서 가져오자.
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
if self.td3_variant:
logger.info('using TD3 variant model')
self.normalized_critic_tf, self.normalized_critic_tf2 = critic(
normalized_obs0, self.actions)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
self.normalized_critic_with_actor_tf, _ = critic(normalized_obs0,
self.actor_tf,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
out_q1, out_q2 = target_critic(normalized_obs1,
target_actor(normalized_obs1))
min_q1 = tf.minimum(out_q1, out_q2) #min 값 내준다
Q_obs1 = denormalize(min_q1, self.ret_rms)
#기존 ddpg와의 차이점은 동일한 네트워크를 2개의 네트워크로 학습시키고 작은 q값을 내준다. --> 두 Q함수들은 하나의 타겟을 사용합니다, 두 Q함수중 작은 값을 사용하여 계산됩니다.
# 그리고 난 다음 둘다 이 타겟에 대해 regressing 함으로써 배웁니다. 이로써 Q함수의 과대평가를 막는다
# 그걸 rms와 denormalize해서 Q_obs1로 넘겨줌
#-->Clipped Double-Q Learning 알고리즘을 따른다.
else:
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0,
self.actor_tf,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
Q_obs1 = denormalize(
target_critic(normalized_obs1, target_actor(normalized_obs1)),
self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
self.initial_state = None # recurrent architectures not supported yet
class DDPG(object):
def __init__(self,
actor,
critic,
memory,
observation_shape,
action_shape,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
adaptive_param_noise=True,
adaptive_param_noise_policy_threshold=.1,
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.,
td3_variant=False,
td3_policy_freq=1,
td3_policy_noise=0.0,
td3_noise_clip=0.5):
# Inputs.
self.obs0 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs0')
self.obs1 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs1')
self.terminals1 = tf.placeholder(tf.float32,
shape=(None, 1),
name='terminals1')
self.rewards = tf.placeholder(tf.float32,
shape=(None, 1),
name='rewards')
self.actions = tf.placeholder(tf.float32,
shape=(None, ) + action_shape,
name='actions')
self.critic_target = tf.placeholder(tf.float32,
shape=(None, 1),
name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32,
shape=(),
name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
#추가된 내용
#parameters for using TD3 variant of DDPG
#https://arxiv.org/abs/1802.09477
self.td3_variant = td3_variant
self.td3_policy_freq = td3_policy_freq
self.td3_policy_noise = td3_policy_noise
self.td3_noise_clip = td3_noise_clip
#노말라이제이션 코드 her에서 가져오자.
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
if self.td3_variant:
logger.info('using TD3 variant model')
self.normalized_critic_tf, self.normalized_critic_tf2 = critic(
normalized_obs0, self.actions)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
self.normalized_critic_with_actor_tf, _ = critic(normalized_obs0,
self.actor_tf,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
out_q1, out_q2 = target_critic(normalized_obs1,
target_actor(normalized_obs1))
min_q1 = tf.minimum(out_q1, out_q2) #min 값 내준다
Q_obs1 = denormalize(min_q1, self.ret_rms)
#기존 ddpg와의 차이점은 동일한 네트워크를 2개의 네트워크로 학습시키고 작은 q값을 내준다. --> 두 Q함수들은 하나의 타겟을 사용합니다, 두 Q함수중 작은 값을 사용하여 계산됩니다.
# 그리고 난 다음 둘다 이 타겟에 대해 regressing 함으로써 배웁니다. 이로써 Q함수의 과대평가를 막는다
# 그걸 rms와 denormalize해서 Q_obs1로 넘겨줌
#-->Clipped Double-Q Learning 알고리즘을 따른다.
else:
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0,
self.actor_tf,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
Q_obs1 = denormalize(
target_critic(normalized_obs1, target_actor(normalized_obs1)),
self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
self.initial_state = None # recurrent architectures not supported yet
def setup_target_network_updates(self):
actor_init_updates, actor_soft_updates = get_target_updates(
self.actor.vars, self.target_actor.vars, self.tau)
critic_init_updates, critic_soft_updates = get_target_updates(
self.critic.vars, self.target_critic.vars, self.tau)
self.target_init_updates = [actor_init_updates, critic_init_updates]
# self.target_soft_updates = [actor_soft_updates, critic_soft_updates] DDPG
self.actor_target_soft_updates = actor_soft_updates
self.critic_target_soft_updates = critic_soft_updates
def setup_param_noise(self, normalized_obs0):
assert self.param_noise is not None
# Configure perturbed actor.
param_noise_actor = copy(self.actor)
param_noise_actor.name = 'param_noise_actor'
self.perturbed_actor_tf = param_noise_actor(normalized_obs0)
logger.info('setting up param noise')
self.perturb_policy_ops = get_perturbed_actor_updates(
self.actor, param_noise_actor, self.param_noise_stddev)
# Configure separate copy for stddev adoption.
adaptive_param_noise_actor = copy(self.actor)
adaptive_param_noise_actor.name = 'adaptive_param_noise_actor'
adaptive_actor_tf = adaptive_param_noise_actor(normalized_obs0)
self.perturb_adaptive_policy_ops = get_perturbed_actor_updates(
self.actor, adaptive_param_noise_actor, self.param_noise_stddev)
self.adaptive_policy_distance = tf.sqrt(
tf.reduce_mean(tf.square(self.actor_tf - adaptive_actor_tf)))
def setup_actor_optimizer(self):
logger.info('setting up actor optimizer')
self.actor_loss = -tf.reduce_mean(self.critic_with_actor_tf)
actor_shapes = [
var.get_shape().as_list() for var in self.actor.trainable_vars
]
actor_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
self.actor_grads = U.flatgrad(self.actor_loss,
self.actor.trainable_vars,
clip_norm=self.clip_norm)
self.actor_optimizer = MpiAdam(var_list=self.actor.trainable_vars,
beta1=0.9,
beta2=0.999,
epsilon=1e-08)
def setup_critic_optimizer(self):
logger.info('setting up critic optimizer')
normalized_critic_target_tf = tf.clip_by_value(
normalize(self.critic_target, self.ret_rms), self.return_range[0],
self.return_range[1])
if self.td3_variant:
logger.info('using TD3 variant loss')
self.critic_loss = tf.losses.mean_squared_error(normalized_critic_target_tf,self.normalized_critic_tf) \
+ tf.losses.mean_squared_error(normalized_critic_target_tf,self.normalized_critic_tf2)
else:
self.critic_loss = tf.reduce_mean(
tf.square(self.normalized_critic_tf -
normalized_critic_target_tf))
if self.critic_l2_reg > 0.:
critic_reg_vars = [
var for var in self.critic.trainable_vars
if 'kernel' in var.name and 'output' not in var.name
]
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(
self.critic_l2_reg))
critic_reg = tc.layers.apply_regularization(
tc.layers.l2_regularizer(self.critic_l2_reg),
weights_list=critic_reg_vars)
self.critic_loss += critic_reg
critic_shapes = [
var.get_shape().as_list() for var in self.critic.trainable_vars
]
critic_nb_params = sum(
[reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
self.critic_grads = U.flatgrad(self.critic_loss,
self.critic.trainable_vars,
clip_norm=self.clip_norm)
self.critic_optimizer = MpiAdam(var_list=self.critic.trainable_vars,
beta1=0.9,
beta2=0.999,
epsilon=1e-08)
def setup_popart(self):
# See https://arxiv.org/pdf/1602.07714.pdf for details.
self.old_std = tf.placeholder(tf.float32, shape=[1], name='old_std')
new_std = self.ret_rms.std
self.old_mean = tf.placeholder(tf.float32, shape=[1], name='old_mean')
new_mean = self.ret_rms.mean
self.renormalize_Q_outputs_op = []
for vs in [self.critic.output_vars, self.target_critic.output_vars]:
assert len(vs) == 2
M, b = vs
assert 'kernel' in M.name
assert 'bias' in b.name
assert M.get_shape()[-1] == 1
assert b.get_shape()[-1] == 1
self.renormalize_Q_outputs_op += [
M.assign(M * self.old_std / new_std)
]
self.renormalize_Q_outputs_op += [
b.assign(
(b * self.old_std + self.old_mean - new_mean) / new_std)
]
def setup_stats(self):
ops = []
names = []
if self.normalize_returns:
ops += [self.ret_rms.mean, self.ret_rms.std]
names += ['ret_rms_mean', 'ret_rms_std']
if self.normalize_observations:
ops += [
tf.reduce_mean(self.obs_rms.mean),
tf.reduce_mean(self.obs_rms.std)
]
names += ['obs_rms_mean', 'obs_rms_std']
ops += [tf.reduce_mean(self.critic_tf)]
names += ['reference_Q_mean']
ops += [reduce_std(self.critic_tf)]
names += ['reference_Q_std']
ops += [tf.reduce_mean(self.critic_with_actor_tf)]
names += ['reference_actor_Q_mean']
ops += [reduce_std(self.critic_with_actor_tf)]
names += ['reference_actor_Q_std']
ops += [tf.reduce_mean(self.actor_tf)]
names += ['reference_action_mean']
ops += [reduce_std(self.actor_tf)]
names += ['reference_action_std']
if self.param_noise:
ops += [tf.reduce_mean(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_mean']
ops += [reduce_std(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_std']
self.stats_ops = ops
self.stats_names = names
def step(self, obs, apply_noise=True, compute_Q=True):
if self.param_noise is not None and apply_noise:
actor_tf = self.perturbed_actor_tf
else:
actor_tf = self.actor_tf
feed_dict = {
self.obs0: U.adjust_shape(self.obs0, [obs])
} #obs0에만 obs feed해준다
if compute_Q:
action, q = self.sess.run([actor_tf, self.critic_with_actor_tf],
feed_dict=feed_dict)
else:
action = self.sess.run(actor_tf, feed_dict=feed_dict)
q = None
#Exploration을 위해 액션에 노이즈 추가
if self.action_noise is not None and apply_noise:
noise = self.action_noise()
assert noise.shape == action[0].shape
action += noise
action = np.clip(action, self.action_range[0], self.action_range[1])
return action, q, None, None
def store_transition(self, obs0, action, reward, obs1, terminal1):
reward *= self.reward_scale
B = obs0.shape[0]
for b in range(B):
self.memory.append(obs0[b], action[b], reward[b], obs1[b],
terminal1[b])
if self.normalize_observations:
self.obs_rms.update(np.array([obs0[b]]))
def train(self, train_iter):
# Get a batch.
batch = self.memory.sample(batch_size=self.batch_size)
if self.normalize_returns and self.enable_popart:
old_mean, old_std, target_Q = self.sess.run(
[self.ret_rms.mean, self.ret_rms.std, self.target_Q],
feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
self.ret_rms.update(target_Q.flatten())
self.sess.run(self.renormalize_Q_outputs_op,
feed_dict={
self.old_std: np.array([old_std]),
self.old_mean: np.array([old_mean]),
})
# Run sanity check. Disabled by default since it slows down things considerably.
# print('running sanity check')
# target_Q_new, new_mean, new_std = self.sess.run([self.target_Q, self.ret_rms.mean, self.ret_rms.std], feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
# print(target_Q_new, target_Q, new_mean, new_std)
# assert (np.abs(target_Q - target_Q_new) < 1e-3).all()
else:
target_Q = self.sess.run(self.target_Q,
feed_dict={
self.obs1:
batch['obs1'],
self.rewards:
batch['rewards'],
self.terminals1:
batch['terminals1'].astype('float32'),
})
if self.td3_policy_noise > 0:
noise = np.random.normal(loc=0.0,
scale=self.td3_policy_noise,
size=np.shape(batch['actions']))
noise = np.clip(noise, -self.td3_noise_clip, self.td3_noise_clip)
# Get all gradients and perform a synced update.
ops = [
self.actor_grads, self.actor_loss, self.critic_grads,
self.critic_loss
]
actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(
ops,
feed_dict={
self.obs0:
batch['obs0'],
self.actions:
np.clip(batch['actions'] + noise, self.action_range[0],
self.action_range[1]),
self.critic_target:
target_Q,
})
else:
# Get all gradients and perform a synced update.
ops = [
self.actor_grads, self.actor_loss, self.critic_grads,
self.critic_loss
]
actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(
ops,
feed_dict={
self.obs0: batch['obs0'],
self.actions: batch['actions'],
self.critic_target: target_Q,
})
#TD3 has hyperparameter for how frequently to update actor policy and target networks
if train_iter % self.td3_policy_freq == 0:
self.actor_optimizer.update(actor_grads, stepsize=self.actor_lr)
self.critic_optimizer.update(critic_grads, stepsize=self.critic_lr)
return critic_loss, actor_loss
def initialize(self, sess):
self.sess = sess
self.sess.run(tf.global_variables_initializer())
self.actor_optimizer.sync()
self.critic_optimizer.sync()
self.sess.run(self.target_init_updates)
def update_target_net(self, train_iter):
# TD3 has hyperparameter for how frequently to update actor policy and target networks
if train_iter % self.td3_policy_freq == 0:
self.sess.run(self.actor_target_soft_updates)
self.sess.run(self.critic_target_soft_updates)
def get_stats(self):
if self.stats_sample is None:
# Get a sample and keep that fixed for all further computations.
# This allows us to estimate the change in value for the same set of inputs.
self.stats_sample = self.memory.sample(batch_size=self.batch_size)
values = self.sess.run(self.stats_ops,
feed_dict={
self.obs0: self.stats_sample['obs0'],
self.actions: self.stats_sample['actions'],
})
names = self.stats_names[:]
assert len(names) == len(values)
stats = dict(zip(names, values))
if self.param_noise is not None:
stats = {**stats, **self.param_noise.get_stats()}
return stats
#파라미터에 노이즈는 왜추가하지?
def adapt_param_noise(self):
if self.param_noise is None:
return 0.
# Perturb a separate copy of the policy to adjust the scale for the next "real" perturbation.
batch = self.memory.sample(batch_size=self.batch_size)
self.sess.run(self.perturb_adaptive_policy_ops,
feed_dict={
self.param_noise_stddev:
self.param_noise.current_stddev,
})
distance = self.sess.run(self.adaptive_policy_distance,
feed_dict={
self.obs0:
batch['obs0'],
self.param_noise_stddev:
self.param_noise.current_stddev,
})
mean_distance = MPI.COMM_WORLD.allreduce(
distance, op=MPI.SUM) / MPI.COMM_WORLD.Get_size()
self.param_noise.adapt(mean_distance)
return mean_distance
def reset(self):
# Reset internal state after an episode is complete.
if self.action_noise is not None:
self.action_noise.reset()
if self.param_noise is not None:
self.sess.run(self.perturb_policy_ops,
feed_dict={
self.param_noise_stddev:
self.param_noise.current_stddev,
})
def __init__(self, actor, critic, memory, observation_shape, action_shape, param_noise=None, action_noise=None,
gamma=0.99, tau=0.001, normalize_returns=False, enable_popart=False, normalize_observations=True,
batch_size=128, observation_range=(-5., 5.), action_range=(-1., 1.), return_range=(-np.inf, np.inf),
adaptive_param_noise=True, adaptive_param_noise_policy_threshold=.1,
critic_l2_reg=0., actor_lr=1e-4, critic_lr=1e-3, clip_norm=None, reward_scale=1.):
# Inputs.
self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs0')
self.obs1 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs1')
self.terminals1 = tf.placeholder(tf.float32, shape=(None, 1), name='terminals1')
self.rewards = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions = tf.placeholder(tf.float32, shape=(None,) + action_shape, name='actions')
self.critic_target = tf.placeholder(tf.float32, shape=(None, 1), name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32, shape=(), name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(tf.clip_by_value(self.normalized_critic_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0, self.actor_tf, reuse=True)
self.critic_with_actor_tf = denormalize(tf.clip_by_value(self.normalized_critic_with_actor_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
Q_obs1 = denormalize(target_critic(normalized_obs1, target_actor(normalized_obs1)), self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
def _init(self,
ob_space,
ac_space,
hid_size,
num_hid_layers,
gaussian_fixed_var=True):
assert isinstance(ob_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[sequence_length] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std, -5.0,
5.0)
last_out = obz
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'vfconv1', (7, 7), (3, 3), pad='VALID'))
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'vfconv2', (5, 5), (2, 2), pad='VALID'))
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'vfconv3', (3, 3), (1, 1), pad='VALID'))
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'vfconv4', (3, 3), (1, 1), pad='VALID'))
last_out = tf.reshape(last_out, tf.convert_to_tensor([-1, 784 * 4]))
last_out = tf.nn.tanh(
tf.layers.dense(last_out,
512,
kernel_initializer=U.normc_initializer(1.0)))
self.vpred = tf.layers.dense(
last_out, 1, kernel_initializer=U.normc_initializer(1.0))[:, 0]
last_out = obz
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'polconv1', (7, 7), (3, 3), pad='VALID'))
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'polconv2', (5, 5), (2, 2), pad='VALID'))
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'polconv3', (3, 3), (1, 1), pad='VALID'))
last_out = tf.nn.tanh(
U.conv2d(last_out, 64, 'polconv4', (3, 3), (1, 1), pad='VALID'))
last_out = tf.reshape(last_out, tf.convert_to_tensor([-1, 784 * 4]))
last_out = tf.nn.tanh(
tf.layers.dense(last_out,
512,
kernel_initializer=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = tf.layers.dense(
last_out,
pdtype.param_shape()[0] // 2,
kernel_initializer=U.normc_initializer(0.01))
logstd = tf.get_variable(name="logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.zeros_initializer())
pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
pdparam = tf.layers.dense(
last_out,
pdtype.param_shape()[0],
kernel_initializer=U.normc_initializer(0.01))
self.pd = pdtype.pdfromflat(pdparam)
self.state_in = []
self.state_out = []
# change for BC
stochastic = U.get_placeholder(name="stochastic",
dtype=tf.bool,
shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self.ac = ac
self._act = U.function([stochastic, ob], [ac, self.vpred])
def _init(self,
ob_space,
ac_space,
hid_size,
num_hid_layers,
gaussian_fixed_var=True):
assert isinstance(ob_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[sequence_length] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
with tf.variable_scope('vf'):
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std,
-5.0, 5.0)
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
tf.layers.dense(
last_out,
hid_size,
name="fc%i" % (i + 1),
kernel_initializer=U.normc_initializer(1.0)))
self.vpred = tf.layers.dense(
last_out,
1,
name='final',
kernel_initializer=U.normc_initializer(1.0))[:, 0]
with tf.variable_scope('pol'):
last_out = obz
num_policy = 1
state_embedding = tf.tile(tf.expand_dims(obz, axis=1),
[1, num_policy, 1])
rnn_cell = rnn.BasicLSTMCell(num_units=pdtype.param_shape()[0])
self.sub_policies, states = tf.nn.dynamic_rnn(
cell=rnn_cell,
inputs=state_embedding,
dtype=tf.float32,
scope='subpolicy')
lstm_cell = rnn.BasicLSTMCell(num_units=num_policy)
concatenated = tf.concat([self.sub_policies, state_embedding],
axis=2)
self.out, states = tf.nn.dynamic_rnn(cell=lstm_cell,
inputs=concatenated,
dtype=tf.float32,
scope='master')
last_output = self.out[:, -1, :]
self.chosen_index = tf.argmax(last_output, axis=1)
# self.weights = tf.nn.softmax(logits=last_output, dim=
self.weights = tf.one_hot(indices=self.chosen_index,
depth=num_policy)
last_out = tf.reduce_sum(tf.expand_dims(self.weights, axis=2) *
self.sub_policies,
axis=1)
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = tf.layers.dense(
last_out,
pdtype.param_shape()[0] // 2,
name='final',
kernel_initializer=U.normc_initializer(0.01))
logstd = tf.get_variable(
name="logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.zeros_initializer())
pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
pdparam = tf.layers.dense(
last_out,
pdtype.param_shape()[0],
name='final',
kernel_initializer=U.normc_initializer(0.01))
self.pd = pdtype.pdfromflat(last_out)
self.state_in = []
self.state_out = []
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self._act = U.function([stochastic, ob], [ac, self.vpred])
def _init(self, ob_space, sensor_space, ac_space, hid_size, num_hid_layers,
kind, elm_mode):
assert isinstance(ob_space, gym.spaces.Box)
assert isinstance(sensor_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[sequence_length] + list(ob_space.shape))
ob_sensor = U.get_placeholder(name="ob_sensor",
dtype=tf.float32,
shape=[sequence_length] +
list(sensor_space.shape))
x = ob / 255.0
if kind == 'small': # from A3C paper
x = tf.nn.relu(U.conv2d(x, 16, "l1", [8, 8], [4, 4], pad="VALID"))
x = tf.nn.relu(U.conv2d(x, 32, "l2", [4, 4], [2, 2], pad="VALID"))
x = ODEBlock(32, (3, 3))(x)
x = U.flattenallbut0(x)
x = tf.nn.relu(
tf.layers.dense(x,
256,
name='lin',
kernel_initializer=U.normc_initializer(1.0)))
## Obfilter on sensor output
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=sensor_space.shape)
obz_sensor = tf.clip_by_value(
(ob_sensor - self.ob_rms.mean) / self.ob_rms.std, -5.0, 5.0)
# x = tf.nn.relu(tf.layers.dense(x, 256, name='lin', kernel_initializer=U.normc_initializer(1.0)))
last_out = obz_sensor
if not elm_mode:
## Adapted from mlp_policy
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
tf.layers.dense(
last_out,
hid_size,
name="vffc%i" % (i + 1),
kernel_initializer=U.normc_initializer(1.0)))
y = tf.layers.dense(last_out,
64,
name="vffinal",
kernel_initializer=U.normc_initializer(1.0))
else:
last_out = tf.nn.tanh(
tf.layers.dense(last_out,
hid_size,
name="vffc1",
kernel_initializer=U.normc_initializer(1.0),
trainable=False))
y = tf.layers.dense(last_out,
64,
name="vffinal",
kernel_initializer=U.normc_initializer(1.0))
x = tf.concat([x, y], 1)
logits = tf.layers.dense(x,
pdtype.param_shape()[0],
name="logits",
kernel_initializer=U.normc_initializer(0.01))
self.pd = pdtype.pdfromflat(logits)
self.vpred = tf.layers.dense(
x, 1, name="value", kernel_initializer=U.normc_initializer(1.0))[:,
0]
# self.session.run(logits.kernel)
self.state_in = []
self.state_out = []
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = self.pd.sample() # XXX
self._act = U.function([stochastic, ob, ob_sensor],
[ac, self.vpred, logits])
def __init__(self,
name,
actor,
critic,
memory,
obs_space_n,
act_space_n,
agent_index,
obs_rms,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.):
self.name = name
self.num_agents = len(obs_space_n)
self.agent_index = agent_index
from gym import spaces
continuous_ctrl = not isinstance(act_space_n[0], spaces.Discrete)
# TODO: remove after testing
assert continuous_ctrl
# Multi-agent inputs
# self.obs0 = []
# self.obs1 = []
self.actions = []
# self.norm_obs0_ph = []
# self.norm_obs1_ph = []
self.obs0 = tf.placeholder(tf.float32,
shape=(
self.num_agents,
None,
) + obs_space_n[self.agent_index].shape,
name="obs0")
self.obs1 = tf.placeholder(tf.float32,
shape=(
self.num_agents,
None,
) + obs_space_n[self.agent_index].shape,
name="obs1")
# if continuous_ctrl:
# self.actions = tf.placeholder(tf.float32, shape=(self.num_agents, None,) + act_space_n[self.agent_index].shape, name="action")
# else:
# act_pdtype_n = [make_pdtype(act_space) for act_space in act_space_n]
# self.actions = [act_pdtype_n[i].sample_placeholder([None], name="action"+str(i)) for i in range(len(act_space_n))]
# this is required to reshape obs and actions for concatenation
obs_shape_list = [self.num_agents] + list(
obs_space_n[self.agent_index].shape)
act_shape_list = [self.num_agents] + list(
act_space_n[self.agent_index].shape)
self.obs_shape_prod = np.prod(obs_shape_list)
self.act_shape_prod = np.prod(act_shape_list)
for i in range(self.num_agents):
# each obs in obs0,obs1 contains info about ego agent and relative pos/vel of other agents
# self.obs0.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="obs0_"+str(i)))
# self.obs1.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="obs1_"+str(i)))
if continuous_ctrl:
self.actions.append(
tf.placeholder(tf.float32,
shape=[None] + list(act_space_n[i].shape),
name="action" + str(i)))
else:
self.actions.append(
make_pdtype(act_space_n[i]).sample_placeholder(
[None], name="action" + str(i)))
# self.norm_obs0_ph.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="norm_obs0_"+str(i)))
# self.norm_obs1_ph.append(tf.placeholder(tf.float32, shape=[None] + list(obs_space_n[i].shape), name="norm_obs1_"+str(i)))
# self.norm_obs0_ph = tf.placeholder(tf.float32, shape=[self.num_agents, None] + list(obs_space_n[self.agent_index].shape), name="norm_obs0")
# self.norm_obs1_ph = tf.placeholder(tf.float32, shape=[self.num_agents, None] + list(obs_space_n[self.agent_index].shape), name="norm_obs1")
# we only provide single agent inputs for these placeholders
self.terminals1 = tf.placeholder(tf.float32,
shape=(None, 1),
name='terminals1')
self.rewards = tf.placeholder(tf.float32,
shape=(None, 1),
name='rewards')
self.critic_target = tf.placeholder(tf.float32,
shape=(None, 1),
name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32,
shape=(),
name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
# Observation normalization.
# TODO: need to update the replay buffer storage function to account for multiple agents
if self.normalize_observations:
self.obs_rms = obs_rms
else:
self.obs_rms = None
# Need to transpose observations so we can normalize them
# converts tensor to shape (batch_size, num_agents, space_size)
# transose on dim 0 and 1, leave dim 2 unchanged
obs0_t = tf.transpose(self.obs0, perm=[1, 0, 2])
obs1_t = tf.transpose(self.obs1, perm=[1, 0, 2])
actions_t = tf.transpose(self.actions, perm=[1, 0, 2])
# each entry in obs_t is normalized wrt the agent
normalized_obs0 = tf.clip_by_value(normalize(obs0_t, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(obs1_t, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
# convert the obs to original shape after normalization for convenience
normalized_act_obs0 = tf.transpose(normalized_obs0, perm=[1, 0, 2])
normalized_act_obs1 = tf.transpose(normalized_obs1, perm=[1, 0, 2])
# need to specify exact shape, since we dont always pass batch size number of obs/act
normalized_obs0_flat = tf.reshape(normalized_obs0,
[-1, self.obs_shape_prod])
normalized_obs1_flat = tf.reshape(normalized_obs1,
[-1, self.obs_shape_prod])
actions_t_flat = tf.reshape(actions_t, [-1, self.act_shape_prod])
# Return normalization.
# TODO: update this to handle multiple agents if required
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
# Each agents gets its own observation
self.actor_tf = actor(normalized_act_obs0[self.agent_index])
self.target_actor_tf = target_actor(
normalized_act_obs1[self.agent_index])
# Critic gets all observations
self.normalized_critic_tf = critic(normalized_obs0_flat,
actions_t_flat)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf, self.return_range[0],
self.return_range[1]), self.ret_rms)
# need to provide critic() with all actions
act_input_n = self.actions + [] # copy actions
act_input_n[
self.
agent_index] = self.actor_tf # update current agent action using its actor
act_input_n_t = tf.transpose(act_input_n, perm=[1, 0, 2])
act_input_n_t_flat = tf.reshape(act_input_n_t,
[-1, self.act_shape_prod])
self.normalized_critic_with_actor_tf = critic(normalized_obs0_flat,
act_input_n_t_flat,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
# we need to use actions for all agents
target_act_input_n = self.actions + [] # copy actions
target_act_input_n[
self.
agent_index] = self.target_actor_tf # update current agent action using its target actor
target_act_input_n_t = tf.transpose(target_act_input_n, perm=[1, 0, 2])
target_act_input_n_t_flat = tf.reshape(target_act_input_n_t,
[-1, self.act_shape_prod])
Q_obs1 = denormalize(
target_critic(normalized_obs1_flat, target_act_input_n_t_flat),
self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
# param noise is added to actor; hence obs for current agent is required
self.setup_param_noise(normalized_act_obs0[self.agent_index])
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
self.initial_state = None # recurrent architectures not supported yet
def _init(self, ob_space, ac_space, hid_size, num_hid_layers, gaussian_fixed_var=True, num_options=2,dc=0):
assert isinstance(ob_space, gym.spaces.Box)
# determine the dimensions of the state space and observation space
self.ac_space_dim = ac_space.shape[0]
self.ob_space_dim = ob_space.shape[0]
self.dc = dc
self.last_action = tf.zeros(ac_space.shape, dtype=tf.float32)
self.last_action_init = tf.zeros(ac_space.shape, dtype=tf.float32)
self.num_options = num_options
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob", dtype=tf.float32, shape=[sequence_length] + list(ob_space.shape))
option = U.get_placeholder(name="option", dtype=tf.int32, shape=[None])
# create a filter for the pure shape, meaning excluding u[k-1]
obs_shape_pure = ((self.ob_space_dim - self.ac_space_dim),)
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
with tf.variable_scope("obfilter_pure"):
self.ob_rms_only = RunningMeanStd(shape=obs_shape_pure)
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std, -5.0, 5.0)
obz_pure = tf.clip_by_value((ob[:,:-self.ac_space_dim] - self.ob_rms_only.mean) / self.ob_rms_only.std, -5.0, 5.0)
# define the Q-function network here
last_out0 = obz_pure # for option 0
last_out1 = obz_pure # for option 1
for i in range(num_hid_layers):
last_out0 = tf.nn.tanh(U.dense(last_out0, hid_size, "vffc0%i"%(i+1), weight_init=U.normc_initializer(1.0)))
last_out1 = tf.nn.tanh(U.dense(last_out1, hid_size, "vffc1%i"%(i+1), weight_init=U.normc_initializer(1.0)))
last_out0 = U.dense(last_out0, 1, "vfff0", weight_init=U.normc_initializer(1.0))
last_out1 = U.dense(last_out1, 1, "vfff1", weight_init=U.normc_initializer(1.0))
# return the Q function value Q(s,o)
self.vpred = U.switch(option[0], last_out1, last_out0)[:,0]
# define the policy over options here
last_out0 = obz_pure # for option 0
last_out1 = obz_pure # for option 1
for i in range(num_hid_layers):
last_out0 = tf.nn.tanh(U.dense(last_out0, hid_size, "oppi0%i"%(i+1), weight_init=U.normc_initializer(1.0)))
last_out1 = tf.nn.tanh(U.dense(last_out1, hid_size, "oppi1%i"%(i+1), weight_init=U.normc_initializer(1.0)))
last_out0 = U.dense(last_out0, 1, "oppif0", weight_init=U.normc_initializer(1.0))
last_out1 = U.dense(last_out1, 1, "oppif1", weight_init=U.normc_initializer(1.0))
last_out = tf.concat([last_out0, last_out1], 1)
# return the probabilities for executing the options
self.op_pi = tf.nn.softmax(last_out)
self.tpred = tf.nn.sigmoid(dense3D2(tf.stop_gradient(last_out), 1, "termhead", option, num_options=num_options, weight_init=U.normc_initializer(1.0)))[:,0]
# we always terminate
termination_sample = tf.constant([True])
# implement the intra option policy
last_out = obz_pure
for i in range(num_hid_layers):
last_out = tf.nn.tanh(U.dense(last_out, hid_size, "polfc%i"%(i+1), weight_init=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = dense3D2(last_out, pdtype.param_shape()[0]//2, "polfinal", option, num_options=num_options, weight_init=U.normc_initializer(0.01),bias=False)
mean = tf.nn.tanh(mean)
logstd = tf.get_variable(name="logstd", shape=[num_options, 1, pdtype.param_shape()[0]//2], initializer=tf.zeros_initializer())
pdparam = U.concatenate([mean, mean * 0.0 + logstd[option[0]]], axis=1)
else:
pdparam = U.dense(last_out, pdtype.param_shape()[0], "polfinal", U.normc_initializer(0.01))
#self.op_pi = tf.nn.softmax(U.dense(tf.stop_gradient(last_out), num_options, "OPfc%i"%(i+1), weight_init=U.normc_initializer(1.0)))
self.pd = pdtype.pdfromflat(pdparam)
self.state_in = []
self.state_out = []
# now we never perform the ZOH, both policies are fully functional
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
ac = tf.clip_by_value(ac,-1.0,1.0)
self.last_action = tf.stop_gradient(ac)
self._act = U.function([stochastic, ob, option], [ac, self.vpred, last_out, logstd])
self._get_v = U.function([ob, option], [self.vpred])
self.get_term = U.function([ob, option], [termination_sample])
self.get_tpred = U.function([ob, option], [self.tpred])
self.get_vpred = U.function([ob, option], [self.vpred])
self._get_op = U.function([ob], [self.op_pi])
class ActorLearner(object):
def __init__(self, name, actor, memory, observation_shape, action_shape,
gamma=0.95, tau=0.001, normalize_observations=True,
batch_size=128, observation_range=(-5., 5.), return_range=(-np.inf, np.inf),
actor_l2_reg=0., actor_lr=5e-5, clip_norm=None, ):
# Inputs.
self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='expert_actor_obs0')
self.action_target = tf.placeholder(tf.float32, shape=(None,) + action_shape, name=name+'action_target')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.return_range = return_range
self.observation_range = observation_range
self.clip_norm = clip_norm
self.batch_size = batch_size
self.stats_sample = None
self.actor_l2_reg = actor_l2_reg
self.actor = actor
self.actor_lr = actor_lr
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope(name + 'obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
# Set up parts.
self.setup_actor_optimizer()
self.setup_stats()
self.initial_state = None # recurrent architectures not supported yet
def setup_actor_optimizer(self):
logger.info('setting up actor optimizer')
self.actor_loss = tf.reduce_mean(tf.square(self.actor_tf - self.action_target))
actor_shapes = [var.get_shape().as_list() for var in self.actor.trainable_vars]
actor_nb_params = sum([reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
self.actor_grads = U.flatgrad(self.actor_loss, self.actor.trainable_vars, clip_norm=self.clip_norm)
self.actor_optimizer = tf.train.AdamOptimizer(learning_rate=self.actor_lr)
self.optimize_expr = self.actor_optimizer.minimize(self.actor_loss, var_list=self.actor.trainable_vars)
def setup_stats(self):
ops = []
names = []
if self.normalize_observations:
ops += [tf.reduce_mean(self.obs_rms.mean), tf.reduce_mean(self.obs_rms.std)]
names += ['obs_rms_mean', 'obs_rms_std']
self.stats_ops = ops
self.stats_names = names
def train(self):
# Get a batch.
batch = self.memory.sample(batch_size=self.batch_size)
# Get all gradients and perform a synced update.
ops = [self.actor_grads, self.actor_loss]
actor_grads, actor_loss = self.sess.run(ops, feed_dict={
self.obs0: batch['obs0'],
self.action_target: batch['actions'],
})
# with self.graph.as_default():
self.optimize_expr.run(session=self.sess,
feed_dict={
self.obs0: batch['obs0'],
self.action_target: batch['actions'],
}
)
return actor_loss
def initialize(self, sess):
self.sess = sess
def save(self, path):
save_variables(path)
def load(self, path):
load_variables(path)
def store_transition(self, obs0, action):
# B = obs0.shape[0]
# for b in range(B):
self.memory.append(obs0, action)
if self.normalize_observations:
self.obs_rms.update(obs0)
print("Stored ", obs0.shape)
def __call__(self, obs):
# with self.graph.as_default():
print("Expert Actor call")
feed_dict = {self.obs0: U.adjust_shape(self.obs0, obs)}
# import IPython; IPython.embed()
action = self.sess.run([self.actor_tf], feed_dict=feed_dict)
print("Expert Actor return")
return action
def _init(self,
ob_space,
ac_space,
hid_size,
num_hid_layers,
gaussian_fixed_var=True):
# assert isinstance(ob_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[sequence_length] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
with tf.variable_scope('vf'):
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std,
-5.0, 5.0)
last_out = obz
last_out = tf.one_hot(indices=tf.cast(last_out, dtype=tf.int32),
depth=ob_space.n)
print(last_out)
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
tf.layers.dense(
last_out,
hid_size,
name="fc%i" % (i + 1),
kernel_initializer=U.normc_initializer(1.0)))
self.vpred = tf.layers.dense(
last_out,
1,
name='final',
kernel_initializer=U.normc_initializer(1.0))[:, 0]
with tf.variable_scope('pol'):
last_out = obz
last_out = tf.one_hot(indices=tf.cast(last_out, dtype=tf.int32),
depth=ob_space.n)
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
tf.layers.dense(
last_out,
hid_size,
name='fc%i' % (i + 1),
kernel_initializer=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = tf.layers.dense(
last_out,
pdtype.param_shape()[0] // 2,
name='final',
kernel_initializer=U.normc_initializer(0.01))
logstd = tf.get_variable(
name="logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.zeros_initializer())
pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
pdparam = tf.layers.dense(
last_out,
pdtype.param_shape()[0],
name='final',
kernel_initializer=U.normc_initializer(0.01))
self.pd = pdtype.pdfromflat(pdparam)
self.state_in = []
self.state_out = []
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self._act = U.function([stochastic, ob], [ac, self.vpred])
def _init(self,
ob_space,
ac_space,
hid_size,
num_hid_layers,
gaussian_fixed_var=True,
bound_by_sigmoid=False,
sigmoid_coef=1.,
activation='tanh',
normalize_obs=True,
actions='gaussian',
avg_norm_symmetry=False,
symmetric_interpretation=False,
stdclip=5.0,
gaussian_bias=False,
gaussian_from_binary=False,
parallel_value=False,
pv_layers=2,
pv_hid_size=512,
three=False):
assert isinstance(ob_space, gym.spaces.Box)
if actions == 'binary':
self.pdtype = pdtype = MultiCategoricalPdType(
low=np.zeros_like(ac_space.low, dtype=np.int32),
high=np.ones_like(ac_space.high, dtype=np.int32))
elif actions == 'beta':
self.pdtype = pdtype = BetaPdType(
low=np.zeros_like(ac_space.low, dtype=np.int32),
high=np.ones_like(ac_space.high, dtype=np.int32))
elif actions == 'bernoulli':
self.pdtype = pdtype = BernoulliPdType(ac_space.low.size)
elif actions == 'gaussian':
self.pdtype = pdtype = make_pdtype(ac_space)
elif actions == 'cat_3':
self.pdtype = pdtype = MultiCategoricalPdType(
low=np.zeros_like(ac_space.low, dtype=np.int32),
high=np.ones_like(ac_space.high, dtype=np.int32) * 2)
elif actions == 'cat_5':
self.pdtype = pdtype = MultiCategoricalPdType(
low=np.zeros_like(ac_space.low, dtype=np.int32),
high=np.ones_like(ac_space.high, dtype=np.int32) * 4)
else:
assert False
sequence_length = None
self.ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[sequence_length] +
list(ob_space.shape))
self.st = U.get_placeholder(name="st", dtype=tf.int32, shape=[None])
if normalize_obs:
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
if avg_norm_symmetry:
# Warning works only for normal observations (41 numbers)
ob_mean = (tf.gather(self.ob_rms.mean, ORIG_SYMMETRIC_IDS) +
self.ob_rms.mean) / 2
ob_std = (tf.gather(self.ob_rms.std, ORIG_SYMMETRIC_IDS) +
self.ob_rms.std) / 2 # Pretty crude
else:
ob_mean = self.ob_rms.mean
ob_std = self.ob_rms.std
obz = tf.clip_by_value((self.ob - ob_mean) / ob_std, -stdclip,
stdclip)
#obz = tf.Print(obz, [self.ob_rms.mean], message='rms_mean', summarize=41)
#obz = tf.Print(obz, [self.ob_rms.std], message='rms_std', summarize=41)
else:
obz = self.ob
vpreds = []
pparams = []
for part in range(1 if not three else 3):
part_prefix = "" if part == 0 else "part_" + str(part)
# Predicted value
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
U.dense(last_out,
hid_size,
part_prefix + "vffc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
vpreds.append(
U.dense(last_out,
1,
part_prefix + "vffinal",
weight_init=U.normc_initializer(1.0)))
vpreds[-1] = vpreds[-1][:, 0]
if parallel_value:
last_out_2 = obz
for i in range(pv_layers):
last_out_2 = tf.nn.tanh(
U.dense(last_out_2,
pv_hid_size,
part_prefix + "pv_vffc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
last_out_2 = U.dense(last_out_2,
1,
part_prefix + "pv_vffinal",
weight_init=U.normc_initializer(1.0))
vpreds[-1] += last_out_2[:, 0]
last_out = obz
if activation == 'tanh': activation = tf.nn.tanh
elif activation == 'relu': activation = tf.nn.relu
for i in range(num_hid_layers):
dense = U.dense(last_out,
hid_size,
part_prefix + "polfc%i" % (i + 1),
weight_init=U.normc_initializer(1.0))
last_out = activation(dense)
if actions == 'gaussian':
if gaussian_fixed_var:
mean = U.dense(last_out,
pdtype.param_shape()[0] // 2,
part_prefix + "polfinal",
U.normc_initializer(0.01))
if bound_by_sigmoid:
mean = tf.nn.sigmoid(mean * sigmoid_coef)
logstd = tf.get_variable(
name=part_prefix + "logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.zeros_initializer())
logstd = mean * 0.0 + logstd
else:
mean = U.dense(last_out,
pdtype.param_shape()[0] // 2,
part_prefix + "polfinal",
U.normc_initializer(0.01))
logstd = U.dense(last_out,
pdtype.param_shape()[0] // 2,
part_prefix + "polfinal_2",
U.normc_initializer(0.01))
if gaussian_bias:
mean = mean + 0.5
pdparam = U.concatenate([mean, logstd], axis=1)
elif actions == 'beta':
pdparam = U.dense(last_out,
pdtype.param_shape()[0],
part_prefix + "beta_lastlayer",
U.normc_initializer(0.01))
pdparam = tf.nn.softplus(pdparam)
elif actions in ['bernoulli', 'binary']:
if bound_by_sigmoid:
raise NotImplementedError(
"bound by sigmoid not implemented here")
pdparam = U.dense(last_out,
pdtype.param_shape()[0],
part_prefix + "polfinal",
U.normc_initializer(0.01))
elif actions in ['cat_3']:
pdparam = U.dense(last_out,
pdtype.param_shape()[0],
part_prefix + "cat3_lastlayer",
U.normc_initializer(0.01))
# prob = tf.reshape(pdparam, [18, -1])
# prob = tf.nn.softmax(prob)
# elogit = tf.exp(pdparam)
# pdparam = tf.Print(pdparam, [prob], summarize=18)
elif actions in ['cat_5']:
pdparam = U.dense(last_out,
pdtype.param_shape()[0],
part_prefix + "cat5_lastlayer",
U.normc_initializer(0.01))
# prob = tf.reshape(pdparam, [18, -1])
# prob = tf.nn.softmax(prob)
# elogit = tf.exp(pdparam)
# pdparam = tf.Print(pdparam, [prob], summarize=18)
else:
assert False
pparams.append(pdparam)
pparams = tf.stack(pparams)
vpreds = tf.stack(vpreds)
pparams = tf.transpose(pparams,
perm=(1, 0, 2)) # [batchsize, networks, values]
vpreds = tf.transpose(vpreds,
perm=(1, 0)) # [batchsize, networks, values]
self.stochastic = tf.placeholder(name="stochastic",
dtype=tf.bool,
shape=())
if three:
batchsize = tf.shape(pdparam)[0]
NO_OBSTACLES_ID = 5
OBST_DIST = [278, 279, 280, 281, 282, 283, 284,
285] # TODO: Alternative approach
distances = [self.ob[:, i] for i in OBST_DIST]
distances = tf.stack(distances, axis=1)
no_obstacles = tf.cast(tf.equal(self.ob[:, NO_OBSTACLES_ID], 1.0),
tf.int32)
distances = tf.cast(tf.reduce_all(tf.equal(distances, 3), axis=1),
tf.int32)
no_obstacles_ahead = distances * no_obstacles # 0 if obstacles, 1 if no obstacles
begin = tf.cast(tf.less(self.st, 75), tf.int32)
take_id = (1 - begin) * (
1 + no_obstacles_ahead
) # begin==1 => 0, begin==0 => 1 + no_obstacles_ahead
take_id = tf.stack((tf.range(batchsize), take_id), axis=1)
pdparam = tf.gather_nd(pparams, take_id)
self.vpred = tf.gather_nd(vpreds, take_id)
#self.vpred = tf.Print(self.vpred, [take_id])
else:
self.vpred = vpreds[:, 0]
pdparam = pparams[:, 0]
self.pd = pdtype.pdfromflat(pdparam)
if hasattr(self.pd, 'real_mean'):
real_mean = self.pd.real_mean()
ac = U.switch(self.stochastic, self.pd.sample(), real_mean)
else:
ac = U.switch(self.stochastic, self.pd.sample(), self.pd.mode())
self._act = U.function([self.stochastic, self.ob, self.st],
[ac, self.vpred, ob_mean, ob_std])
if actions == 'binary':
self._binary_f = U.function([self.stochastic, self.ob, self.st],
[ac, self.pd.flat, self.vpred])
def _init(self, ob_space, ac_space, hid_size, num_hid_layers, gaussian_fixed_var=True, num_options=2,dc=0, kind='small'):
assert isinstance(ob_space, gym.spaces.Box)
self.dc = dc
self.num_options = num_options
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob", dtype=tf.float32, shape=[sequence_length] + list(ob_space.shape))
option = U.get_placeholder(name="option", dtype=tf.int32, shape=[None])
x = ob / 255.0
if kind == 'small': # from A3C paper
x = tf.nn.relu(U.conv2d(x, 16, "l1", [8, 8], [4, 4], pad="VALID"))
x = tf.nn.relu(U.conv2d(x, 32, "l2", [4, 4], [2, 2], pad="VALID"))
x = U.flattenallbut0(x)
x = tf.nn.relu(U.dense(x, 256, 'lin', U.normc_initializer(1.0)))
elif kind == 'large': # Nature DQN
x = tf.nn.relu(U.conv2d(x, 32, "l1", [8, 8], [4, 4], pad="VALID"))
x = tf.nn.relu(U.conv2d(x, 64, "l2", [4, 4], [2, 2], pad="VALID"))
x = tf.nn.relu(U.conv2d(x, 64, "l3", [3, 3], [1, 1], pad="VALID"))
x = U.flattenallbut0(x)
x = tf.nn.relu(U.dense(x, 512, 'lin', U.normc_initializer(1.0)))
else:
raise NotImplementedError
# Network to compute value function and termination probabilities
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
obz = x
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(U.dense(last_out, hid_size, "vffc%i"%(i+1), weight_init=U.normc_initializer(1.0)))
self.vpred = dense3D2(last_out, 1, "vffinal", option, num_options=num_options, weight_init=U.normc_initializer(1.0))[:,0]
self.vpred_ent = dense3D2(last_out, 1, "vffinal_ent", option, num_options=num_options, weight_init=U.normc_initializer(1.0))[:,0]
self.tpred = tf.nn.sigmoid(dense3D2(tf.stop_gradient(last_out), 1, "termhead", option, num_options=num_options, weight_init=U.normc_initializer(1.0)))[:,0]
termination_sample = tf.greater(self.tpred, tf.random_uniform(shape=tf.shape(self.tpred),maxval=1.))
# Network to compute policy over options and intra_option policies
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(U.dense(last_out, hid_size, "polfc%i"%(i+1), weight_init=U.normc_initializer(1.0)))
# if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Discrete):
# mean = dense3D2(last_out, pdtype.param_shape()[0]//2, "polfinal", option, num_options=num_options, weight_init=U.normc_initializer(0.01))
# logstd = tf.get_variable(name="logstd", shape=[num_options, 1, pdtype.param_shape()[0]//2], initializer=tf.zeros_initializer())
# pdparam = U.concatenate([mean, mean * 0.0 + logstd[option[0]]], axis=1)
# else:
pdparam = U.dense(last_out, pdtype.param_shape()[0], "polfinal", U.normc_initializer(0.01))
self.op_pi = tf.nn.softmax(U.dense(tf.stop_gradient(last_out), num_options, "OPfc%i"%(i+1), weight_init=U.normc_initializer(1.0)))
self.pd = pdtype.pdfromflat(pdparam)
self.state_in = []
self.state_out = []
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self._act = U.function([stochastic, ob, option], [ac, self.vpred, self.vpred_ent, last_out])
self._get_logits = U.function([stochastic, ob, option], [self.pd.logits] )
self._get_v = U.function([ob, option], [self.vpred])
self._get_v_ent = U.function([ob, option], [self.vpred_ent]) # Entropy value estimate
self.get_term = U.function([ob, option], [termination_sample])
self.get_tpred = U.function([ob, option], [self.tpred])
self.get_vpred = U.function([ob, option], [self.vpred])
self.get_vpred_ent = U.function([ob, option], [self.vpred_ent]) # Entropy value estimate
self._get_op = U.function([ob], [self.op_pi])
def _init(self,
ob_space,
ac_space,
hid_size,
num_hid_layers,
gaussian_fixed_var=True):
assert isinstance(ob_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[sequence_length] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std, -5.0,
5.0)
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
dense(last_out,
hid_size,
"vffc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
self.vpred = dense(last_out,
1,
"vffinal",
weight_init=U.normc_initializer(1.0))[:, 0]
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
dense(last_out,
hid_size,
"polfc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = dense(last_out,
pdtype.param_shape()[0] // 2, "polfinal",
U.normc_initializer(0.01))
logstd = tf.get_variable(name="logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.zeros_initializer())
pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
pdparam = dense(last_out,
pdtype.param_shape()[0], "polfinal",
U.normc_initializer(0.01))
self.pd = pdtype.pdfromflat(pdparam)
self.state_in = []
self.state_out = []
# change for BC
stochastic = U.get_placeholder(name="stochastic",
dtype=tf.bool,
shape=())
ac = U.switch(stochastic, self.pd.sample(), self.pd.mode())
self.ac = ac
self._act = U.function([stochastic, ob], [ac, self.vpred])
class DDPG(object):
def __init__(self, actor, critic, memory, observation_shape, action_shape, param_noise=None, action_noise=None,
gamma=0.99, tau=0.001, normalize_returns=False, enable_popart=False, normalize_observations=True,
batch_size=128, observation_range=(-5., 5.), action_range=(-1., 1.), return_range=(-np.inf, np.inf),
adaptive_param_noise=True, adaptive_param_noise_policy_threshold=.1,
critic_l2_reg=0., actor_lr=1e-4, critic_lr=1e-3, clip_norm=None, reward_scale=1., expert=None, save_networks=False,
supervise=False, actor_only=False, critic_only=False, both_ours_sup=False, gail=False, pofd=False):
# Inputs.
self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs0')
self.obs1 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs1')
self.terminals1 = tf.placeholder(tf.float32, shape=(None, 1), name='terminals1')
self.rewards = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions = tf.placeholder(tf.float32, shape=(None,) + action_shape, name='actions')
self.critic_target = tf.placeholder(tf.float32, shape=(None, 1), name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32, shape=(), name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
self.expert = expert
self.save_networks = save_networks
self.supervise = supervise
self.actor_only = actor_only
self.critic_only = critic_only
self.both_ours_sup = both_ours_sup
self.gail=gail
self.pofd=pofd
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
print(target_actor.vars)
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(tf.clip_by_value(self.normalized_critic_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0, self.actor_tf, reuse=True)
self.critic_with_actor_tf = denormalize(tf.clip_by_value(self.normalized_critic_with_actor_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
Q_obs1 = denormalize(target_critic(normalized_obs1, target_actor(normalized_obs1)), self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
if self.expert is not None:
self.expert.set_tf(actor=actor, critic=critic, obs0=normalized_obs0, actions=self.actions, obs_rms=self.obs_rms, ret_rms=self.ret_rms,
observation_range=self.observation_range, return_range=self.return_range,
supervise=self.supervise, actor_only=self.actor_only, critic_only=self.critic_only,
both_ours_sup=self.both_ours_sup, gail=self.gail, pofd=self.pofd)
training_step = tf.get_variable('training_step', shape=[1], initializer=tf.ones_initializer)
self.training_step_run = training_step.assign(training_step + 1)
self.training_step = 0
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
def setup_target_network_updates(self):
actor_init_updates, actor_soft_updates = get_target_updates(self.actor.vars, self.target_actor.vars, self.tau)
critic_init_updates, critic_soft_updates = get_target_updates(self.critic.vars, self.target_critic.vars, self.tau)
self.target_init_updates = [actor_init_updates, critic_init_updates]
self.target_soft_updates = [actor_soft_updates, critic_soft_updates]
def setup_param_noise(self, normalized_obs0):
assert self.param_noise is not None
# Configure perturbed actor.
param_noise_actor = copy(self.actor)
param_noise_actor.name = 'param_noise_actor'
self.perturbed_actor_tf = param_noise_actor(normalized_obs0)
logger.info('setting up param noise')
self.perturb_policy_ops = get_perturbed_actor_updates(self.actor, param_noise_actor, self.param_noise_stddev)
# Configure separate copy for stddev adoption.
adaptive_param_noise_actor = copy(self.actor)
adaptive_param_noise_actor.name = 'adaptive_param_noise_actor'
adaptive_actor_tf = adaptive_param_noise_actor(normalized_obs0)
self.perturb_adaptive_policy_ops = get_perturbed_actor_updates(self.actor, adaptive_param_noise_actor, self.param_noise_stddev)
self.adaptive_policy_distance = tf.sqrt(tf.reduce_mean(tf.square(self.actor_tf - adaptive_actor_tf)))
def setup_actor_optimizer(self):
logger.info('setting up actor optimizer')
self.actor_loss = -tf.reduce_mean(self.critic_with_actor_tf)
if self.expert is not None:
self.expert_actor_loss = self.expert.actor_loss + self.actor_loss
if self.gail:
self.expert_actor_loss = self.expert.actor_loss
if self.pofd:
self.expert_actor_loss = self.expert.actor_loss + self.actor_loss
# self.expert_actor_loss = self.actor_loss
actor_shapes = [var.get_shape().as_list() for var in self.actor.trainable_vars]
actor_nb_params = sum([reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
self.actor_grads = U.flatgrad(self.actor_loss, self.actor.trainable_vars, clip_norm=self.clip_norm)
if self.expert is not None:
self.expert_actor_grads = U.flatgrad(self.expert_actor_loss, self.actor.trainable_vars,
clip_norm=self.clip_norm)
else:
self.expert_actor_grads = None
self.actor_optimizer = MpiAdam(var_list=self.actor.trainable_vars, beta1=0.9, beta2=0.999, epsilon=1e-08)
def setup_critic_optimizer(self):
logger.info('setting up critic optimizer')
normalized_critic_target_tf = tf.clip_by_value(normalize(self.critic_target, self.ret_rms), self.return_range[0], self.return_range[1])
self.critic_loss = tf.reduce_mean(tf.square(self.normalized_critic_tf - normalized_critic_target_tf))
if self.critic_l2_reg > 0.:
critic_reg_vars = [var for var in self.critic.trainable_vars if 'kernel' in var.name and 'output' not in var.name]
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(self.critic_l2_reg))
critic_reg = tc.layers.apply_regularization(
tc.layers.l2_regularizer(self.critic_l2_reg),
weights_list=critic_reg_vars
)
self.critic_loss += critic_reg
if self.expert is not None:
self.expert_critic_loss = self.expert.critic_loss + self.critic_loss
if self.gail:
self.expert_critic_loss = self.expert.discriminator_loss
if self.pofd:
self.expert_critic_loss = self.expert.discriminator_loss + self.critic_loss
critic_shapes = [var.get_shape().as_list() for var in self.critic.trainable_vars]
critic_nb_params = sum([reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
self.critic_grads = U.flatgrad(self.critic_loss, self.critic.trainable_vars, clip_norm=self.clip_norm)
if self.expert is not None:
self.expert_critic_grads = U.flatgrad(self.expert_critic_loss, self.critic.trainable_vars, clip_norm=self.clip_norm)
else:
self.expert_critic_grads = None
self.critic_optimizer = MpiAdam(var_list=self.critic.trainable_vars, beta1=0.9, beta2=0.999, epsilon=1e-08)
def setup_popart(self):
# See https://arxiv.org/pdf/1602.07714.pdf for details.
self.old_std = tf.placeholder(tf.float32, shape=[1], name='old_std')
new_std = self.ret_rms.std
self.old_mean = tf.placeholder(tf.float32, shape=[1], name='old_mean')
new_mean = self.ret_rms.mean
self.renormalize_Q_outputs_op = []
for vs in [self.critic.output_vars, self.target_critic.output_vars]:
assert len(vs) == 2
M, b = vs
assert 'kernel' in M.name
assert 'bias' in b.name
assert M.get_shape()[-1] == 1
assert b.get_shape()[-1] == 1
self.renormalize_Q_outputs_op += [M.assign(M * self.old_std / new_std)]
self.renormalize_Q_outputs_op += [b.assign((b * self.old_std + self.old_mean - new_mean) / new_std)]
def setup_stats(self):
ops = []
names = []
if self.normalize_returns:
ops += [self.ret_rms.mean, self.ret_rms.std]
names += ['ret_rms_mean', 'ret_rms_std']
if self.normalize_observations:
ops += [tf.reduce_mean(self.obs_rms.mean), tf.reduce_mean(self.obs_rms.std)]
names += ['obs_rms_mean', 'obs_rms_std']
ops += [tf.reduce_mean(self.critic_tf)]
names += ['reference_Q_mean']
ops += [reduce_std(self.critic_tf)]
names += ['reference_Q_std']
ops += [tf.reduce_mean(self.critic_with_actor_tf)]
names += ['reference_actor_Q_mean']
ops += [reduce_std(self.critic_with_actor_tf)]
names += ['reference_actor_Q_std']
ops += [tf.reduce_mean(self.actor_tf)]
names += ['reference_action_mean']
ops += [reduce_std(self.actor_tf)]
names += ['reference_action_std']
if self.param_noise:
ops += [tf.reduce_mean(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_mean']
ops += [reduce_std(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_std']
self.stats_ops = ops
self.stats_names = names
def pi(self, obs, apply_noise=True, compute_Q=True):
if self.param_noise is not None and apply_noise:
actor_tf = self.perturbed_actor_tf
else:
actor_tf = self.actor_tf
feed_dict = {self.obs0: [obs]}
if compute_Q:
action, q = self.sess.run([actor_tf, self.critic_with_actor_tf], feed_dict=feed_dict)
else:
action = self.sess.run(actor_tf, feed_dict=feed_dict)
q = None
action = action.flatten()
if self.action_noise is not None and apply_noise:
noise = self.action_noise()
assert noise.shape == action.shape
action += noise
action = np.clip(action, self.action_range[0], self.action_range[1])
return action, q
def store_transition(self, obs0, action, reward, obs1, terminal1):
reward *= self.reward_scale
self.memory.append(obs0, action, reward, obs1, terminal1)
if self.normalize_observations:
self.obs_rms.update(np.array([obs0]))
def train(self, pretrain):
# Get a batch.
batch = self.memory.sample(batch_size=self.batch_size)
if self.normalize_returns and self.enable_popart:
old_mean, old_std, target_Q = self.sess.run([self.ret_rms.mean, self.ret_rms.std, self.target_Q], feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
self.ret_rms.update(target_Q.flatten())
self.sess.run(self.renormalize_Q_outputs_op, feed_dict={
self.old_std : np.array([old_std]),
self.old_mean : np.array([old_mean]),
})
# Run sanity check. Disabled by default since it slows down things considerably.
# print('running sanity check')
# target_Q_new, new_mean, new_std = self.sess.run([self.target_Q, self.ret_rms.mean, self.ret_rms.std], feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
# print(target_Q_new, target_Q, new_mean, new_std)
# assert (np.abs(target_Q - target_Q_new) < 1e-3).all()
else:
target_Q = self.sess.run(self.target_Q, feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
# Get all gradients and perform a synced update.
if self.expert is not None and pretrain:
# self.training_step < self.expert_steps:
expert_batch = self.expert.sample(batch_size=self.batch_size)
ops = [self.training_step_run, self.expert_actor_grads, self.expert_actor_loss,
self.expert_critic_grads, self.expert_critic_loss]
training_step, actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(ops, feed_dict={
self.obs0: batch['obs0'],
self.actions: batch['actions'],
self.critic_target: target_Q,
self.expert.expert_state: expert_batch['obs0'],
self.expert.expert_action: expert_batch['actions']
})
else:
ops = [self.training_step_run, self.actor_grads, self.actor_loss, self.critic_grads, self.critic_loss]
training_step, actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(ops, feed_dict={
self.obs0: batch['obs0'],
self.actions: batch['actions'],
self.critic_target: target_Q,
})
self.actor_optimizer.update(actor_grads, stepsize=self.actor_lr)
self.critic_optimizer.update(critic_grads, stepsize=self.critic_lr)
self.training_step = training_step[0]
if self.save_networks:
if self.training_step.astype(int) % self.save_steps == 0:
logger.info('Saved network with {} training steps'.format(self.training_step.astype(int)))
self.saver.save(self.sess, self.ckp_dir, global_step=self.training_step.astype(int))
return critic_loss, actor_loss
def initialize(self, sess, saver, ckp_dir, save_steps, expert_steps):
self.sess = sess
self.saver = saver
self.ckp_dir = ckp_dir
self.save_steps = save_steps
self.expert_steps = expert_steps
self.sess.run(tf.global_variables_initializer())
self.actor_optimizer.sync()
self.critic_optimizer.sync()
self.sess.run(self.target_init_updates)
checkpoint = tf.train.get_checkpoint_state(self.ckp_dir)
if self.saver and checkpoint and checkpoint.model_checkpoint_path:
self.saver.restore(self.sess, checkpoint.model_checkpoint_path)
logger.info('Successfully loaded {}'.format(checkpoint.model_checkpoint_path))
else:
logger.info('Could not find old network weights')
def update_target_net(self):
self.sess.run(self.target_soft_updates)
def get_stats(self):
if self.stats_sample is None:
# Get a sample and keep that fixed for all further computations.
# This allows us to estimate the change in value for the same set of inputs.
self.stats_sample = self.memory.sample(batch_size=self.batch_size)
values = self.sess.run(self.stats_ops, feed_dict={
self.obs0: self.stats_sample['obs0'],
self.actions: self.stats_sample['actions'],
})
names = self.stats_names[:]
assert len(names) == len(values)
stats = dict(zip(names, values))
if self.param_noise is not None:
stats = {**stats, **self.param_noise.get_stats()}
return stats
def adapt_param_noise(self):
if self.param_noise is None:
return 0.
# Perturb a separate copy of the policy to adjust the scale for the next "real" perturbation.
batch = self.memory.sample(batch_size=self.batch_size)
self.sess.run(self.perturb_adaptive_policy_ops, feed_dict={
self.param_noise_stddev: self.param_noise.current_stddev,
})
distance = self.sess.run(self.adaptive_policy_distance, feed_dict={
self.obs0: batch['obs0'],
self.param_noise_stddev: self.param_noise.current_stddev,
})
mean_distance = mpi_mean(distance)
self.param_noise.adapt(mean_distance)
return mean_distance
def reset(self):
# Reset internal state after an episode is complete.
if self.action_noise is not None:
self.action_noise.reset()
if self.param_noise is not None:
self.sess.run(self.perturb_policy_ops, feed_dict={
self.param_noise_stddev: self.param_noise.current_stddev,
})
class DDPG(object):
def __init__(self, actor, critic, memory, observation_shape, action_shape, param_noise=None, action_noise=None,
gamma=0.99, tau=0.001, normalize_returns=False, enable_popart=False, normalize_observations=True,
batch_size=128, observation_range=(-1., 1.), action_range= [0.2, 0.2, 0.2, 0.2, 0.2, 0.2], return_range=(-np.inf, np.inf),
adaptive_param_noise=True, critic_l2_reg=0.,
adaptive_param_noise_policy_threshold=.1, actor_lr=1e-4, critic_lr=1e-3, clip_norm=None, reward_scale=1., restore=False):
# Inputs.
# self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs0')
self.obs0 = tf.placeholder(tf.float32, shape=(None, observation_shape), name='obs0')
# self.obs1 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs1')
self.obs1 = tf.placeholder(tf.float32, shape=(None, observation_shape), name='obs1')
self.terminals1 = tf.placeholder(tf.float32, shape=(None, 1), name='terminals1')
self.rewards = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions = tf.placeholder(tf.float32, shape=(None, action_shape), name='actions')
self.critic_target = tf.placeholder(tf.float32, shape=(None, 1), name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32, shape=(), name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(tf.clip_by_value(self.normalized_critic_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0, self.actor_tf, reuse=True)
self.critic_with_actor_tf = denormalize(tf.clip_by_value(self.normalized_critic_with_actor_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
Q_obs1 = denormalize(target_critic(normalized_obs1, target_actor(normalized_obs1)), self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
"""Filewriter summary"""
monitor_directory = os.path.join("Experiment_data")
self.summary_dir = os.path.join(monitor_directory, "summary")
# if restore:
# dirname = 'run20' # The last name
# self.summary_dir = os.path.join(self.summary_dir, dirname)
# else:
self.summary_dir = utils.new_summary_dir(self.summary_dir)
# record the detailed parameters
utils.log_params(self.summary_dir, {
"actor learning rate": self.actor_lr,
"critic learning rate": self.critic_lr,
"batch size": self.batch_size,
"actor update rate": self.tau,
"critic update rate": self.tau,
"action noise": self.action_noise,
"param noise": self.param_noise,
"reward function": 'General reward function',
"result_function": 'The second 100'
})
self.merged = tf.summary.merge_all()
def setup_target_network_updates(self):
actor_init_updates, actor_soft_updates = get_target_updates(self.actor.vars, self.target_actor.vars, self.tau)
critic_init_updates, critic_soft_updates = get_target_updates(self.critic.vars, self.target_critic.vars, self.tau)
self.target_init_updates = [actor_init_updates, critic_init_updates]
self.target_soft_updates = [actor_soft_updates, critic_soft_updates]
def setup_param_noise(self, normalized_obs0):
assert self.param_noise is not None ## 确保假设完全正确
# Configure perturbed actor.
param_noise_actor = copy(self.actor)
param_noise_actor.name = 'param_noise_actor'
self.perturbed_actor_tf = param_noise_actor(normalized_obs0)
logger.info('setting up param noise')
self.perturb_policy_ops = get_perturbed_actor_updates(self.actor, param_noise_actor, self.param_noise_stddev)
# Configure separate copy for stddev adoption.
adaptive_param_noise_actor = copy(self.actor)
adaptive_param_noise_actor.name = 'adaptive_param_noise_actor'
adaptive_actor_tf = adaptive_param_noise_actor(normalized_obs0)
self.perturb_adaptive_policy_ops = get_perturbed_actor_updates(self.actor, adaptive_param_noise_actor, self.param_noise_stddev)
self.adaptive_policy_distance = tf.sqrt(tf.reduce_mean(tf.square(self.actor_tf - adaptive_actor_tf)))
def adapt_param_noise(self):
if self.param_noise is None:
return 0.
# Perturb a separate copy of the policy to adjust the scale for the next "real" perturbation.
batch = self.memory.sample(batch_size=self.batch_size)
self.sess.run(self.perturb_adaptive_policy_ops, feed_dict={
self.param_noise_stddev: self.param_noise.current_stddev,
})
distance = self.sess.run(self.adaptive_policy_distance, feed_dict={
self.obs0: batch['obs0'],
self.param_noise_stddev: self.param_noise.current_stddev,
})
mean_distance = mpi_mean(distance)
self.param_noise.adapt(mean_distance)
return mean_distance
def setup_actor_optimizer(self):
logger.info('setting up actor optimizer')
self.actor_loss = -tf.reduce_mean(self.critic_with_actor_tf)
actor_shapes = [var.get_shape().as_list() for var in self.actor.trainable_vars]
actor_nb_params = sum([reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
self.actor_grads = U.flatgrad(self.actor_loss, self.actor.trainable_vars, clip_norm=self.clip_norm)
self.actor_optimizer = MpiAdam(var_list=self.actor.trainable_vars,
beta1=0.9, beta2=0.999, epsilon=1e-08)
def setup_critic_optimizer(self):
logger.info('setting up critic optimizer')
normalized_critic_target_tf = tf.clip_by_value(normalize(self.critic_target, self.ret_rms), self.return_range[0], self.return_range[1])
self.critic_loss = tf.reduce_mean(tf.square(self.normalized_critic_tf - normalized_critic_target_tf))
if self.critic_l2_reg > 0.:
critic_reg_vars = [var for var in self.critic.trainable_vars if 'kernel' in var.name and 'output' not in var.name]
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(self.critic_l2_reg))
critic_reg = tc.layers.apply_regularization(
tc.layers.l2_regularizer(self.critic_l2_reg),
weights_list=critic_reg_vars
)
self.critic_loss += critic_reg
critic_shapes = [var.get_shape().as_list() for var in self.critic.trainable_vars]
critic_nb_params = sum([reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
self.critic_grads = U.flatgrad(self.critic_loss, self.critic.trainable_vars, clip_norm=self.clip_norm)
self.critic_optimizer = MpiAdam(var_list=self.critic.trainable_vars,
beta1=0.9, beta2=0.999, epsilon=1e-08)
def setup_popart(self):
# See https://arxiv.org/pdf/1602.07714.pdf for details.
self.old_std = tf.placeholder(tf.float32, shape=[1], name='old_std')
new_std = self.ret_rms.std
self.old_mean = tf.placeholder(tf.float32, shape=[1], name='old_mean')
new_mean = self.ret_rms.mean
self.renormalize_Q_outputs_op = []
for vs in [self.critic.output_vars, self.target_critic.output_vars]:
assert len(vs) == 2
M, b = vs
assert 'kernel' in M.name
assert 'bias' in b.name
assert M.get_shape()[-1] == 1
assert b.get_shape()[-1] == 1
self.renormalize_Q_outputs_op += [M.assign(M * self.old_std / new_std)]
self.renormalize_Q_outputs_op += [b.assign((b * self.old_std + self.old_mean - new_mean) / new_std)]
def setup_stats(self):
ops = []
names = []
if self.normalize_returns:
ops += [self.ret_rms.mean, self.ret_rms.std]
names += ['ret_rms_mean', 'ret_rms_std']
if self.normalize_observations:
ops += [tf.reduce_mean(self.obs_rms.mean), tf.reduce_mean(self.obs_rms.std)]
names += ['obs_rms_mean', 'obs_rms_std']
ops += [tf.reduce_mean(self.critic_tf)]
names += ['reference_Q_mean']
ops += [reduce_std(self.critic_tf)]
names += ['reference_Q_std']
ops += [tf.reduce_mean(self.critic_with_actor_tf)]
names += ['reference_actor_Q_mean']
ops += [reduce_std(self.critic_with_actor_tf)]
names += ['reference_actor_Q_std']
ops += [tf.reduce_mean(self.actor_tf)]
names += ['reference_action_mean']
ops += [reduce_std(self.actor_tf)]
names += ['reference_action_std']
if self.param_noise:
ops += [tf.reduce_mean(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_mean']
ops += [reduce_std(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_std']
self.stats_ops = ops
self.stats_names = names
def pi(self, obs, apply_noise=True, compute_Q=True):
if self.param_noise is not None and apply_noise:
actor_tf = self.perturbed_actor_tf
else:
actor_tf = self.actor_tf
feed_dict = {self.obs0: [obs]}
if compute_Q:
action, q = self.sess.run([actor_tf, self.critic_with_actor_tf], feed_dict=feed_dict)
else:
action = self.sess.run(actor_tf, feed_dict=feed_dict)
q = None
action = action.flatten()
if self.action_noise is not None and apply_noise:
noise = self.action_noise()
assert noise.shape == action.shape
action += noise
action = np.multiply(action, self.action_range)
# action = np.clip(action, self.action_range[0], self.action_range[1])
return action, q
def store_transition(self, obs0, action, reward, obs1, terminal1):
reward *= self.reward_scale
self.memory.append(obs0, action, reward, obs1, terminal1)
if self.normalize_observations:
self.obs_rms.update(np.array([obs0]))
def save_data(self):
self.memory.save_data()
def train(self, dec_actor_lr, dec_critic_lr):
# change the learning rate
self.actor_lr = dec_actor_lr
self.critic_lr = dec_critic_lr
# Get a batch.
batch = self.memory.sample(batch_size=self.batch_size)
if self.normalize_returns and self.enable_popart:
old_mean, old_std, target_Q = self.sess.run([self.ret_rms.mean, self.ret_rms.std, self.target_Q], feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
self.ret_rms.update(target_Q.flatten())
self.sess.run(self.renormalize_Q_outputs_op, feed_dict={
self.old_std : np.array([old_std]),
self.old_mean : np.array([old_mean]),
})
# Run sanity check. Disabled by default since it slows down things considerably.
# print('running sanity check')
# target_Q_new, new_mean, new_std = self.sess.run([self.target_Q, self.ret_rms.mean, self.ret_rms.std], feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
# print(target_Q_new, target_Q, new_mean, new_std)
# assert (np.abs(target_Q - target_Q_new) < 1e-3).all()
else:
target_Q = self.sess.run(self.target_Q, feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
# Get all gradients and perform a synced update.
ops = [self.actor_grads, self.actor_loss, self.critic_grads, self.critic_loss]
actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(ops, feed_dict={
self.obs0: batch['obs0'],
self.actions: batch['actions'],
self.critic_target: target_Q,
})
self.actor_optimizer.update(actor_grads, stepsize=self.actor_lr)
self.critic_optimizer.update(critic_grads, stepsize=self.critic_lr)
return critic_loss, actor_loss
def initialize(self, sess):
self.sess = sess
self.sess.run(tf.global_variables_initializer())
self.actor_optimizer.sync()
self.critic_optimizer.sync()
self.sess.run(self.target_init_updates)
## wirte the graph
self.summary_writer = tf.summary.FileWriter(self.summary_dir, self.sess.graph)
def restore_model(self, model_directory, saver, sess):
ckpt = tf.train.get_checkpoint_state(model_directory)
if ckpt and ckpt.model_checkpoint_path:
saver.restore(sess, ckpt.model_checkpoint_path)
self.sess = sess
logger.info('Load the saved model from the directory!!!')
self.summary_writer = tf.summary.FileWriter(self.summary_dir)
def update_target_net(self):
self.sess.run(self.target_soft_updates)
def feedback_adptive_explore(self):
self.param_noise.adapt_variance()
def ou_adaptive_explore(self):
self.action_noise.adapt_decrease()
def get_stats(self):
if self.stats_sample is None:
# Get a sample and keep that fixed for all further computations.
# This allows us to estimate the change in value for the same set of inputs.
self.stats_sample = self.memory.sample(batch_size=self.batch_size)
values = self.sess.run(self.stats_ops, feed_dict={
self.obs0: self.stats_sample['obs0'],
self.actions: self.stats_sample['actions'],
})
names = self.stats_names[:]
assert len(names) == len(values)
stats = dict(zip(names, values))
if self.param_noise is not None:
stats = {**stats, **self.param_noise.get_stats()}
return stats
def reset(self):
# Reset internal state after an episode is complete.
if self.action_noise is not None:
self.action_noise.reset()
if self.param_noise is not None:
self.sess.run(self.perturb_policy_ops, feed_dict={
self.param_noise_stddev: self.param_noise.current_stddev,
})
def log_scalar(self, name, value, index):
summary_value = summary_pb2.Summary.Value(tag=name, simple_value=value)
summary_2 = summary_pb2.Summary(value=[summary_value])
self.summary_writer.add_summary(summary_2, global_step=index)
def __init__(self, actor, critic, memory, observation_shape, action_shape, param_noise=None, action_noise=None,
gamma=0.99, tau=0.001, normalize_returns=False, enable_popart=False, normalize_observations=True,
batch_size=128, observation_range=(-5., 5.), action_range=(-1., 1.), return_range=(-np.inf, np.inf),
adaptive_param_noise=True, adaptive_param_noise_policy_threshold=.1,
critic_l2_reg=0., actor_lr=1e-4, critic_lr=1e-3, clip_norm=None, reward_scale=1., expert=None, save_networks=False,
supervise=False, actor_only=False, critic_only=False, both_ours_sup=False, gail=False, pofd=False):
# Inputs.
self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs0')
self.obs1 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs1')
self.terminals1 = tf.placeholder(tf.float32, shape=(None, 1), name='terminals1')
self.rewards = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions = tf.placeholder(tf.float32, shape=(None,) + action_shape, name='actions')
self.critic_target = tf.placeholder(tf.float32, shape=(None, 1), name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32, shape=(), name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
self.expert = expert
self.save_networks = save_networks
self.supervise = supervise
self.actor_only = actor_only
self.critic_only = critic_only
self.both_ours_sup = both_ours_sup
self.gail=gail
self.pofd=pofd
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
print(target_actor.vars)
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(tf.clip_by_value(self.normalized_critic_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0, self.actor_tf, reuse=True)
self.critic_with_actor_tf = denormalize(tf.clip_by_value(self.normalized_critic_with_actor_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
Q_obs1 = denormalize(target_critic(normalized_obs1, target_actor(normalized_obs1)), self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
if self.expert is not None:
self.expert.set_tf(actor=actor, critic=critic, obs0=normalized_obs0, actions=self.actions, obs_rms=self.obs_rms, ret_rms=self.ret_rms,
observation_range=self.observation_range, return_range=self.return_range,
supervise=self.supervise, actor_only=self.actor_only, critic_only=self.critic_only,
both_ours_sup=self.both_ours_sup, gail=self.gail, pofd=self.pofd)
training_step = tf.get_variable('training_step', shape=[1], initializer=tf.ones_initializer)
self.training_step_run = training_step.assign(training_step + 1)
self.training_step = 0
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
def _mlpPolicy(hiddens,
ob,
ob_space,
ac_space,
scope,
gaussian_fixed_var=True,
reuse=False):
assert isinstance(ob_space, gym.spaces.Box)
with tf.variable_scope(scope, reuse=reuse):
pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
with tf.variable_scope("obfilter"):
ob_rms = RunningMeanStd(shape=ob_space.shape)
with tf.variable_scope('vf'):
obz = tf.clip_by_value((ob - ob_rms.mean) / ob_rms.std, -5.0, 5.0)
last_out = obz
#for i in range(num_hid_layers):
for (i, hidden) in zip(range(len(hiddens)), hiddens):
last_out = tf.nn.tanh(
tf.layers.dense(
last_out,
hidden,
name="fc%i" % (i + 1),
kernel_initializer=U.normc_initializer(1.0)))
vpred = tf.layers.dense(
last_out,
1,
name='final',
kernel_initializer=U.normc_initializer(1.0))[:, 0]
with tf.variable_scope('pol'):
last_out = obz
#for i in range(num_hid_layers):
#for hidden in hiddens:
for (i, hidden) in zip(range(len(hiddens)), hiddens):
last_out = tf.nn.tanh(
tf.layers.dense(
last_out,
hidden,
name='fc%i' % (i + 1),
kernel_initializer=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
mean = tf.layers.dense(
last_out,
pdtype.param_shape()[0] // 2,
name='final',
kernel_initializer=U.normc_initializer(0.01))
logstd = tf.get_variable(
name="logstd",
shape=[1, pdtype.param_shape()[0] // 2],
initializer=tf.zeros_initializer())
pdparam = tf.concat([mean, mean * 0.0 + logstd], axis=1)
else:
pdparam = tf.layers.dense(
last_out,
pdtype.param_shape()[0],
name='final',
kernel_initializer=U.normc_initializer(0.01))
pd = pdtype.pdfromflat(pdparam)
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, pd.sample(), pd.mode())
_act = U.function([stochastic, ob], [ac, vpred])
return pd.logits, _act
def _init(self,
ob_space,
ac_space,
hid_size,
num_hid_layers,
gaussian_fixed_var=True):
assert isinstance(ob_space, gym.spaces.Box)
self.pdtype = pdtype = make_pdtype(ac_space)
sequence_length = None
ob = U.get_placeholder(name="ob",
dtype=tf.float32,
shape=[sequence_length] + list(ob_space.shape))
with tf.variable_scope("obfilter"):
self.ob_rms = RunningMeanStd(shape=ob_space.shape)
obz = tf.clip_by_value((ob - self.ob_rms.mean) / self.ob_rms.std, -5.0,
5.0)
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
U.dense(last_out,
hid_size,
"vffc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
self.vpred = U.dense(last_out,
1,
"vffinal",
weight_init=U.normc_initializer(1.0))[:, 0]
last_out = obz
for i in range(num_hid_layers):
last_out = tf.nn.tanh(
U.dense(last_out,
hid_size,
"polfc%i" % (i + 1),
weight_init=U.normc_initializer(1.0)))
if gaussian_fixed_var and isinstance(ac_space, gym.spaces.Box):
alpha = tf.nn.softplus(
U.dense(last_out,
ac_space.high.size,
'polfc_alpha',
weight_init=U.normc_initializer(0.001))) + 1.0
beta = tf.nn.softplus(
U.dense(last_out,
ac_space.high.size,
'polfc_beta',
weight_init=U.normc_initializer(0.001))) + 1.0
else:
raise NotImplementedError
self.pd = tfp.distributions.Beta(alpha, beta)
self.state_in = []
self.state_out = []
# compute sampled action
sampled_action = self.pd.sample()
stochastic = tf.placeholder(dtype=tf.bool, shape=())
ac = U.switch(stochastic, sampled_action, self.pd.mode())
self._act = U.function([stochastic, ob], [ac, self.vpred])
def __init__(self,
actor,
critic,
memory,
observation_shape,
action_shape,
param_noise=None,
action_noise=None,
gamma=0.99,
tau=0.001,
normalize_returns=False,
enable_popart=False,
normalize_observations=True,
batch_size=128,
observation_range=(-5., 5.),
action_range=(-1., 1.),
return_range=(-np.inf, np.inf),
critic_l2_reg=0.,
actor_lr=1e-4,
critic_lr=1e-3,
clip_norm=None,
reward_scale=1.):
# Inputs.
self.obs0 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs0')
self.obs1 = tf.placeholder(tf.float32,
shape=(None, ) + observation_shape,
name='obs1')
self.terminals1 = tf.placeholder(tf.float32,
shape=(None, 1),
name='terminals1')
self.rewards = tf.placeholder(tf.float32,
shape=(None, 1),
name='rewards')
self.actions = tf.placeholder(tf.float32,
shape=(None, ) + action_shape,
name='actions')
self.critic_target = tf.placeholder(tf.float32,
shape=(None, 1),
name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32,
shape=(),
name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
self.save = None
self.load = None
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0],
self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(
tf.clip_by_value(self.normalized_critic_tf, self.return_range[0],
self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0,
self.actor_tf,
reuse=True)
self.critic_with_actor_tf = denormalize(
tf.clip_by_value(self.normalized_critic_with_actor_tf,
self.return_range[0], self.return_range[1]),
self.ret_rms)
Q_obs1 = denormalize(
target_critic(normalized_obs1, target_actor(normalized_obs1)),
self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
self.initial_state = None # recurrent architectures not supported yet
class DDPG(object):
def __init__(self, actor, critic, memory, observation_shape, action_shape, param_noise=None, action_noise=None,
gamma=0.99, tau=0.001, normalize_returns=False, enable_popart=False, normalize_observations=True,
batch_size=128, observation_range=(-5., 5.), action_range=(-1., 1.), return_range=(-np.inf, np.inf),
adaptive_param_noise=True, adaptive_param_noise_policy_threshold=.1,
critic_l2_reg=0., actor_lr=1e-4, critic_lr=1e-3, clip_norm=None, reward_scale=1.):
# Inputs.
self.obs0 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs0')
self.obs1 = tf.placeholder(tf.float32, shape=(None,) + observation_shape, name='obs1')
self.terminals1 = tf.placeholder(tf.float32, shape=(None, 1), name='terminals1')
self.rewards = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions = tf.placeholder(tf.float32, shape=(None,) + action_shape, name='actions')
self.critic_target = tf.placeholder(tf.float32, shape=(None, 1), name='critic_target')
self.param_noise_stddev = tf.placeholder(tf.float32, shape=(), name='param_noise_stddev')
# Parameters.
self.gamma = gamma
self.tau = tau
self.memory = memory
self.normalize_observations = normalize_observations
self.normalize_returns = normalize_returns
self.action_noise = action_noise
self.param_noise = param_noise
self.action_range = action_range
self.return_range = return_range
self.observation_range = observation_range
self.critic = critic
self.actor = actor
self.actor_lr = actor_lr
self.critic_lr = critic_lr
self.clip_norm = clip_norm
self.enable_popart = enable_popart
self.reward_scale = reward_scale
self.batch_size = batch_size
self.stats_sample = None
self.critic_l2_reg = critic_l2_reg
# Observation normalization.
if self.normalize_observations:
with tf.variable_scope('obs_rms'):
self.obs_rms = RunningMeanStd(shape=observation_shape)
else:
self.obs_rms = None
normalized_obs0 = tf.clip_by_value(normalize(self.obs0, self.obs_rms),
self.observation_range[0], self.observation_range[1])
normalized_obs1 = tf.clip_by_value(normalize(self.obs1, self.obs_rms),
self.observation_range[0], self.observation_range[1])
# Return normalization.
if self.normalize_returns:
with tf.variable_scope('ret_rms'):
self.ret_rms = RunningMeanStd()
else:
self.ret_rms = None
# Create target networks.
target_actor = copy(actor)
target_actor.name = 'target_actor'
self.target_actor = target_actor
target_critic = copy(critic)
target_critic.name = 'target_critic'
self.target_critic = target_critic
# Create networks and core TF parts that are shared across setup parts.
self.actor_tf = actor(normalized_obs0)
self.normalized_critic_tf = critic(normalized_obs0, self.actions)
self.critic_tf = denormalize(tf.clip_by_value(self.normalized_critic_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
self.normalized_critic_with_actor_tf = critic(normalized_obs0, self.actor_tf, reuse=True)
self.critic_with_actor_tf = denormalize(tf.clip_by_value(self.normalized_critic_with_actor_tf, self.return_range[0], self.return_range[1]), self.ret_rms)
Q_obs1 = denormalize(target_critic(normalized_obs1, target_actor(normalized_obs1)), self.ret_rms)
self.target_Q = self.rewards + (1. - self.terminals1) * gamma * Q_obs1
# Set up parts.
if self.param_noise is not None:
self.setup_param_noise(normalized_obs0)
self.setup_actor_optimizer()
self.setup_critic_optimizer()
if self.normalize_returns and self.enable_popart:
self.setup_popart()
self.setup_stats()
self.setup_target_network_updates()
def setup_target_network_updates(self):
actor_init_updates, actor_soft_updates = get_target_updates(self.actor.vars, self.target_actor.vars, self.tau)
critic_init_updates, critic_soft_updates = get_target_updates(self.critic.vars, self.target_critic.vars, self.tau)
self.target_init_updates = [actor_init_updates, critic_init_updates]
self.target_soft_updates = [actor_soft_updates, critic_soft_updates]
def setup_param_noise(self, normalized_obs0):
assert self.param_noise is not None
# Configure perturbed actor.
param_noise_actor = copy(self.actor)
param_noise_actor.name = 'param_noise_actor'
self.perturbed_actor_tf = param_noise_actor(normalized_obs0)
logger.info('setting up param noise')
self.perturb_policy_ops = get_perturbed_actor_updates(self.actor, param_noise_actor, self.param_noise_stddev)
# Configure separate copy for stddev adoption.
adaptive_param_noise_actor = copy(self.actor)
adaptive_param_noise_actor.name = 'adaptive_param_noise_actor'
adaptive_actor_tf = adaptive_param_noise_actor(normalized_obs0)
self.perturb_adaptive_policy_ops = get_perturbed_actor_updates(self.actor, adaptive_param_noise_actor, self.param_noise_stddev)
self.adaptive_policy_distance = tf.sqrt(tf.reduce_mean(tf.square(self.actor_tf - adaptive_actor_tf)))
def setup_actor_optimizer(self):
logger.info('setting up actor optimizer')
self.actor_loss = -tf.reduce_mean(self.critic_with_actor_tf)
actor_shapes = [var.get_shape().as_list() for var in self.actor.trainable_vars]
actor_nb_params = sum([reduce(lambda x, y: x * y, shape) for shape in actor_shapes])
logger.info(' actor shapes: {}'.format(actor_shapes))
logger.info(' actor params: {}'.format(actor_nb_params))
self.actor_grads = U.flatgrad(self.actor_loss, self.actor.trainable_vars, clip_norm=self.clip_norm)
self.actor_optimizer = MpiAdam(var_list=self.actor.trainable_vars,
beta1=0.9, beta2=0.999, epsilon=1e-08)
def setup_critic_optimizer(self):
logger.info('setting up critic optimizer')
normalized_critic_target_tf = tf.clip_by_value(normalize(self.critic_target, self.ret_rms), self.return_range[0], self.return_range[1])
self.critic_loss = tf.reduce_mean(tf.square(self.normalized_critic_tf - normalized_critic_target_tf))
if self.critic_l2_reg > 0.:
critic_reg_vars = [var for var in self.critic.trainable_vars if 'kernel' in var.name and 'output' not in var.name]
for var in critic_reg_vars:
logger.info(' regularizing: {}'.format(var.name))
logger.info(' applying l2 regularization with {}'.format(self.critic_l2_reg))
critic_reg = tc.layers.apply_regularization(
tc.layers.l2_regularizer(self.critic_l2_reg),
weights_list=critic_reg_vars
)
self.critic_loss += critic_reg
critic_shapes = [var.get_shape().as_list() for var in self.critic.trainable_vars]
critic_nb_params = sum([reduce(lambda x, y: x * y, shape) for shape in critic_shapes])
logger.info(' critic shapes: {}'.format(critic_shapes))
logger.info(' critic params: {}'.format(critic_nb_params))
self.critic_grads = U.flatgrad(self.critic_loss, self.critic.trainable_vars, clip_norm=self.clip_norm)
self.critic_optimizer = MpiAdam(var_list=self.critic.trainable_vars,
beta1=0.9, beta2=0.999, epsilon=1e-08)
def setup_popart(self):
# See https://arxiv.org/pdf/1602.07714.pdf for details.
self.old_std = tf.placeholder(tf.float32, shape=[1], name='old_std')
new_std = self.ret_rms.std
self.old_mean = tf.placeholder(tf.float32, shape=[1], name='old_mean')
new_mean = self.ret_rms.mean
self.renormalize_Q_outputs_op = []
for vs in [self.critic.output_vars, self.target_critic.output_vars]:
assert len(vs) == 2
M, b = vs
assert 'kernel' in M.name
assert 'bias' in b.name
assert M.get_shape()[-1] == 1
assert b.get_shape()[-1] == 1
self.renormalize_Q_outputs_op += [M.assign(M * self.old_std / new_std)]
self.renormalize_Q_outputs_op += [b.assign((b * self.old_std + self.old_mean - new_mean) / new_std)]
def setup_stats(self):
ops = []
names = []
if self.normalize_returns:
ops += [self.ret_rms.mean, self.ret_rms.std]
names += ['ret_rms_mean', 'ret_rms_std']
if self.normalize_observations:
ops += [tf.reduce_mean(self.obs_rms.mean), tf.reduce_mean(self.obs_rms.std)]
names += ['obs_rms_mean', 'obs_rms_std']
ops += [tf.reduce_mean(self.critic_tf)]
names += ['reference_Q_mean']
ops += [reduce_std(self.critic_tf)]
names += ['reference_Q_std']
ops += [tf.reduce_mean(self.critic_with_actor_tf)]
names += ['reference_actor_Q_mean']
ops += [reduce_std(self.critic_with_actor_tf)]
names += ['reference_actor_Q_std']
ops += [tf.reduce_mean(self.actor_tf)]
names += ['reference_action_mean']
ops += [reduce_std(self.actor_tf)]
names += ['reference_action_std']
if self.param_noise:
ops += [tf.reduce_mean(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_mean']
ops += [reduce_std(self.perturbed_actor_tf)]
names += ['reference_perturbed_action_std']
self.stats_ops = ops
self.stats_names = names
def pi(self, obs, apply_noise=True, compute_Q=True):
if self.param_noise is not None and apply_noise:
actor_tf = self.perturbed_actor_tf
else:
actor_tf = self.actor_tf
feed_dict = {self.obs0: [obs]}
if compute_Q:
action, q = self.sess.run([actor_tf, self.critic_with_actor_tf], feed_dict=feed_dict)
else:
action = self.sess.run(actor_tf, feed_dict=feed_dict)
q = None
action = action.flatten()
if self.action_noise is not None and apply_noise:
noise = self.action_noise()
assert noise.shape == action.shape
action += noise
action = np.clip(action, self.action_range[0], self.action_range[1])
return action, q
def store_transition(self, obs0, action, reward, obs1, terminal1):
reward *= self.reward_scale
self.memory.append(obs0, action, reward, obs1, terminal1)
if self.normalize_observations:
self.obs_rms.update(np.array([obs0]))
def train(self):
# Get a batch.
batch = self.memory.sample(batch_size=self.batch_size)
if self.normalize_returns and self.enable_popart:
old_mean, old_std, target_Q = self.sess.run([self.ret_rms.mean, self.ret_rms.std, self.target_Q], feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
self.ret_rms.update(target_Q.flatten())
self.sess.run(self.renormalize_Q_outputs_op, feed_dict={
self.old_std : np.array([old_std]),
self.old_mean : np.array([old_mean]),
})
# Run sanity check. Disabled by default since it slows down things considerably.
# print('running sanity check')
# target_Q_new, new_mean, new_std = self.sess.run([self.target_Q, self.ret_rms.mean, self.ret_rms.std], feed_dict={
# self.obs1: batch['obs1'],
# self.rewards: batch['rewards'],
# self.terminals1: batch['terminals1'].astype('float32'),
# })
# print(target_Q_new, target_Q, new_mean, new_std)
# assert (np.abs(target_Q - target_Q_new) < 1e-3).all()
else:
target_Q = self.sess.run(self.target_Q, feed_dict={
self.obs1: batch['obs1'],
self.rewards: batch['rewards'],
self.terminals1: batch['terminals1'].astype('float32'),
})
# Get all gradients and perform a synced update.
ops = [self.actor_grads, self.actor_loss, self.critic_grads, self.critic_loss]
actor_grads, actor_loss, critic_grads, critic_loss = self.sess.run(ops, feed_dict={
self.obs0: batch['obs0'],
self.actions: batch['actions'],
self.critic_target: target_Q,
})
self.actor_optimizer.update(actor_grads, stepsize=self.actor_lr)
self.critic_optimizer.update(critic_grads, stepsize=self.critic_lr)
return critic_loss, actor_loss
def initialize(self, sess):
self.sess = sess
self.sess.run(tf.global_variables_initializer())
self.actor_optimizer.sync()
self.critic_optimizer.sync()
self.sess.run(self.target_init_updates)
def update_target_net(self):
self.sess.run(self.target_soft_updates)
def get_stats(self):
if self.stats_sample is None:
# Get a sample and keep that fixed for all further computations.
# This allows us to estimate the change in value for the same set of inputs.
self.stats_sample = self.memory.sample(batch_size=self.batch_size)
values = self.sess.run(self.stats_ops, feed_dict={
self.obs0: self.stats_sample['obs0'],
self.actions: self.stats_sample['actions'],
})
names = self.stats_names[:]
assert len(names) == len(values)
stats = dict(zip(names, values))
if self.param_noise is not None:
stats = {**stats, **self.param_noise.get_stats()}
return stats
def adapt_param_noise(self):
if self.param_noise is None:
return 0.
# Perturb a separate copy of the policy to adjust the scale for the next "real" perturbation.
batch = self.memory.sample(batch_size=self.batch_size)
self.sess.run(self.perturb_adaptive_policy_ops, feed_dict={
self.param_noise_stddev: self.param_noise.current_stddev,
})
distance = self.sess.run(self.adaptive_policy_distance, feed_dict={
self.obs0: batch['obs0'],
self.param_noise_stddev: self.param_noise.current_stddev,
})
mean_distance = mpi_mean(distance)
self.param_noise.adapt(mean_distance)
return mean_distance
def reset(self):
# Reset internal state after an episode is complete.
if self.action_noise is not None:
self.action_noise.reset()
if self.param_noise is not None:
self.sess.run(self.perturb_policy_ops, feed_dict={
self.param_noise_stddev: self.param_noise.current_stddev,
})
