def __init__(self, args):
self.args = args
self.env = gym.make(args.env_name)
self.env_params = get_env_params(self.env)
self.video_file = 'data_test/test_video'
self.output_dir = 'data_test'
self.exp_name = 'test'
self.logger = EpochLogger(output_dir=self.output_dir,
exp_name=self.exp_name)
# self.env = wrappers.Monitor(self.env, self.video_file, force=True)
device = 'cuda' if args.cuda else 'cpu'
self.device = torch.device(device)
# load
data_file = os.path.join(args.load_fold, 'vars.pkl')
data = joblib.load(data_file)
## load obs_mean obs_std g_mean g_std
self.obs_mean = data['observation_mean']
self.obs_std = data['observation_std']
## load policy model
model = {
'ddpg': actor,
'td3': actor,
'sac': actor_sac,
'gac': actor_gac
}
self.actor_network = model[args.alg](self.env_params).to(self.device)
model_file = os.path.join(args.load_fold, 'pyt_save', 'model.pt')
self.actor_network.load_state_dict(torch.load(model_file))
def __init__(self, args, env, env_params):
self.args = args
# path to save the model
self.exp_name = '_'.join((self.args.env_name, self.args.alg,
str(self.args.seed), datetime.now().isoformat()))
self.data_path = os.path.join(self.args.save_dir,
'_'.join((self.args.env_name, self.args.alg)),
self.exp_name)
self.logger = EpochLogger(output_dir=self.data_path, exp_name=self.exp_name)
self.logger.save_config(args)
self.env = env
self.env_params = env_params
# create the network
self.actor_network = actor(env_params)
self.critic_network = critic(env_params)
# sync the networks across the cpus
sync_networks(self.actor_network)
sync_networks(self.critic_network)
# build up the target network
self.actor_target_network = actor(env_params)
self.critic_target_network = critic(env_params)
# load the weights into the target networks
self.actor_target_network.load_state_dict(self.actor_network.state_dict())
self.critic_target_network.load_state_dict(self.critic_network.state_dict())
# if use gpu
self.rank = MPI.COMM_WORLD.Get_rank()
if args.cuda:
device = 'cuda:{}'.format(self.rank % torch.cuda.device_count())
else:
device = 'cpu'
self.device = torch.device(device)
if self.args.cuda:
self.actor_network.cuda(self.device)
self.critic_network.cuda(self.device)
self.actor_target_network.cuda(self.device)
self.critic_target_network.cuda(self.device)
# create the optimizer
self.actor_optim = torch.optim.Adam(self.actor_network.parameters(), lr=self.args.lr_actor)
self.critic_optim = torch.optim.Adam(self.critic_network.parameters(), lr=self.args.lr_critic)
# her sampler
self.her_module = her_sampler(self.args.replay_strategy, self.args.replay_k, self.env.compute_reward)
# create the replay buffer
self.buffer = replay_buffer(self.env_params, self.args.buffer_size, self.her_module.sample_her_transitions)
# create the normalizer
self.o_norm = normalizer(size=env_params['obs'], default_clip_range=self.args.clip_range)
self.g_norm = normalizer(size=env_params['goal'], default_clip_range=self.args.clip_range)
self.logger.setup_pytorch_saver(self.actor_network)
def ppo(env_fn,
actor_critic=a2c,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=4000,
epochs=50,
gamma=.99,
clip_ratio=.2,
pi_lr=3e-4,
vf_lr=1e-3,
train_pi_iters=80,
train_v_iters=80,
lam=.97,
max_ep_len=1000,
target_kl=.01,
logger_kwargs=dict(),
save_freq=10):
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
seed += 10000 * proc_id()
tf.set_random_seed(seed)
np.random.seed(seed)
env = env_fn()
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
# Share action space structure with the actor_critic
ac_kwargs['action_space'] = env.action_space
x_ph, a_ph = tf.placeholder( name="x_ph", shape=[None, obs_dim], dtype=tf.float32), \
tf.placeholder( name="a_ph", shape=[None, act_dim], dtype=tf.float32)
adv_ph, ret_ph, logp_old_ph = tf.placeholder( name="adv_ph", shape=[None], dtype=tf.float32), \
tf.placeholder( name="ret_ph", shape=[None], dtype=tf.float32), \
tf.placeholder( name="logp_old_ph", shape=[None], dtype=tf.float32)
# Main outputs from computation graph
# print( actor_critic( x_ph, a_ph, **ac_kwargs))
pi, logp, logp_pi, v = actor_critic(x_ph, a_ph, **ac_kwargs)
all_phs = [x_ph, a_ph, adv_ph, ret_ph, logp_old_ph]
get_action_ops = [pi, v, logp_pi]
local_steps_per_epoch = int(steps_per_epoch / num_procs())
buf = PPOBuffer(obs_dim, act_dim, local_steps_per_epoch, gamma, lam)
# helpers for var count
def get_vars(scope=''):
return [x for x in tf.trainable_variables() if scope in x.name]
def count_vars(scope=''):
v = get_vars(scope)
return sum([np.prod(var.shape.as_list()) for var in v])
var_counts = tuple(count_vars(scope) for scope in ['pi', 'v'])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n' % var_counts)
# PPO Objectives
ratio = tf.exp(logp - logp_old_ph)
min_adv = tf.where(adv_ph > 0, (1 + clip_ratio) * adv_ph,
(1 - clip_ratio) * adv_ph)
pi_loss = -tf.reduce_mean(tf.minimum(ratio * adv_ph, min_adv))
v_loss = tf.reduce_mean((ret_ph - v)**2)
# Stats to watch
approx_kl = tf.reduce_mean(
logp_old_ph -
logp) # a sample estimate for KL-divergence, easy to compute
approx_ent = tf.reduce_mean(-logp)
clipped = tf.logical_or(ratio > (1 + clip_ratio), ratio < (1 - clip_ratio))
clipfrac = tf.reduce_mean(tf.cast(clipped, tf.float32))
train_pi = MpiAdamOptimizer(learning_rate=pi_lr).minimize(pi_loss)
train_v = MpiAdamOptimizer(learning_rate=vf_lr).minimize(v_loss)
sess = tf.Session()
sess.run(tf.global_variables_initializer())
# Sync params across processes
sess.run(sync_all_params())
# Setup model saving
logger.setup_tf_saver(sess, inputs={'x': x_ph}, outputs={'pi': pi, 'v': v})
def update():
inputs = {k: v for k, v in zip(all_phs, buf.get())}
pi_l_old, v_l_old, ent = sess.run([pi_loss, v_loss, approx_ent],
feed_dict=inputs)
for i in range(train_pi_iters):
_, kl = sess.run([train_pi, approx_kl], feed_dict=inputs)
def mpi_avg(x):
"""Average a scalar or vector over MPI processes."""
return mpi_sum(x) / num_procs()
kl = mpi_avg(kl)
if kl > 1.5 * target_kl:
logger.log(
'Early stopping at step %d due to reaching max kl.' % i)
break
logger.store(StopIter=i)
for _ in range(train_v_iters):
sess.run(train_v, feed_dict=inputs)
# Log changes from update
pi_l_new, v_l_new, kl, cf = sess.run(
[pi_loss, v_loss, approx_kl, clipfrac], feed_dict=inputs)
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
Entropy=ent,
ClipFrac=cf,
DeltaLossPi=(pi_l_new - pi_l_old),
DeltaLossV=(v_l_new - v_l_old))
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
for epoch in range(epochs):
for t in range(local_steps_per_epoch):
a, v_t, logp_t = sess.run(get_action_ops,
feed_dict={x_ph: o.reshape(1, -1)})
# save and log
buf.store(o, a, r, v_t, logp_t)
logger.store(VVals=v_t)
o, r, d, _ = env.step(a[0])
ep_ret += r
ep_len += 1
terminal = d or (ep_len == max_ep_len)
if terminal or (t == local_steps_per_epoch - 1):
if not (terminal):
print('Warning: trajectory cut off by epoch at %d steps.' %
ep_len)
# if trajectory didn't reach terminal state, bootstrap value target
last_val = r if d else sess.run(
v, feed_dict={x_ph: o.reshape(1, -1)})
buf.finish_path(last_val)
if terminal:
# only save EpRet / EpLen if trajectory finished
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
# Perform PPO update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts', (epoch + 1) * steps_per_epoch)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
def __init__(self, args, env, test_env, env_params):
self.args = args
# path to save the model
if self.args.mmd:
self.exp_name = '_'.join(
(self.args.env_name, self.args.alg,
'mmd' + str(self.args.beta_mmd), 's' + str(self.args.seed),
datetime.now().isoformat()))
self.data_path = os.path.join(
self.args.save_dir, '_'.join(
(self.args.env_name, self.args.alg,
'mmd' + str(self.args.beta_mmd))), self.exp_name)
else:
self.exp_name = '_'.join(
(self.args.env_name, self.args.alg, str(self.args.seed),
datetime.now().isoformat()))
self.data_path = os.path.join(
self.args.save_dir, '_'.join(
(self.args.env_name, self.args.alg)), self.exp_name)
self.logger = EpochLogger(output_dir=self.data_path,
exp_name=self.exp_name)
self.logger.save_config(args)
self.env = env
self.test_env = test_env
self.env_params = env_params
# create the network
self.actor_network = actor(env_params)
self.critic_network1 = critic(env_params)
self.critic_network2 = critic(env_params)
self.advice_network1 = critic(env_params)
self.advice_network2 = critic(env_params)
# sync the networks across the cpus
sync_networks(self.actor_network)
sync_networks(self.critic_network1)
sync_networks(self.critic_network2)
sync_networks(self.advice_network1)
sync_networks(self.advice_network2)
# build up the target network
# self.actor_target_network = actor(env_params)
self.critic_target_network1 = critic(env_params)
self.critic_target_network2 = critic(env_params)
self.advice_target_network1 = critic(env_params)
self.advice_target_network2 = critic(env_params)
# load the weights into the target networks
# self.actor_target_network.load_state_dict(self.actor_network.state_dict())
self.critic_target_network1.load_state_dict(
self.critic_network1.state_dict())
self.critic_target_network2.load_state_dict(
self.critic_network2.state_dict())
self.advice_target_network1.load_state_dict(
self.advice_network1.state_dict())
self.advice_target_network2.load_state_dict(
self.advice_network2.state_dict())
# if use gpu
self.rank = MPI.COMM_WORLD.Get_rank()
self.mpi_size = MPI.COMM_WORLD.Get_size()
if args.cuda:
device = 'cuda:{}'.format(self.rank % torch.cuda.device_count())
self.device = torch.device(device)
if self.args.cuda:
self.actor_network.cuda(self.device)
self.critic_network1.cuda(self.device)
self.critic_network2.cuda(self.device)
# self.actor_target_network.cuda(self.device)
self.critic_target_network1.cuda(self.device)
self.critic_target_network2.cuda(self.device)
self.advice_network1.cuda(self.device)
self.advice_network2.cuda(self.device)
self.advice_target_network1.cuda(self.device)
self.advice_target_network2.cuda(self.device)
# create the optimizer
self.actor_optim = torch.optim.Adam(self.actor_network.parameters(),
lr=self.args.lr_actor)
self.critic_optim1 = torch.optim.Adam(
self.critic_network1.parameters(), lr=self.args.lr_critic)
self.critic_optim2 = torch.optim.Adam(
self.critic_network2.parameters(), lr=self.args.lr_critic)
self.advice_optim1 = torch.optim.Adam(
self.advice_network1.parameters(), lr=self.args.lr_critic)
self.advice_optim2 = torch.optim.Adam(
self.advice_network2.parameters(), lr=self.args.lr_critic)
# create the replay buffer
self.buffer = ReplayBuffer(self.env_params['obs'],
self.env_params['action'],
self.args.buffer_size)
self.logger.setup_pytorch_saver(self.actor_network)
self.obs_mean, self.obs_std = self.buffer.obs_mean, self.buffer.obs_std
def vpg(env_config, ac_type, ac_kwargs, gamma, lam, epochs, steps_per_epoch,
lr, train_v_iters, max_ep_len, logger_kwargs, seed):
logger = EpochLogger(**logger_kwargs)
configs = locals().copy()
configs.pop("logger")
logger.save_config(configs)
tf.set_random_seed(seed)
np.random.seed(seed)
env = make_env(env_config)
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
obs_ph, a_ph, adv_ph, ret_ph, logp_old_ph = core.placeholders(
obs_dim, act_dim, None, None, None)
actor_critic = gaussian_mlp_actor_critic
pi, logp, logp_pi, v = actor_critic(obs_ph, a_ph, **ac_kwargs)
all_phs = [obs_ph, a_ph, adv_ph, ret_ph, logp_old_ph]
get_action_ops = [pi, v, logp_pi]
# Experience buffer
buf = VPGBuffer(obs_dim, act_dim, steps_per_epoch, gamma, lam)
# VPG objectives
pi_loss = -tf.reduce_mean(logp * adv_ph)
v_loss = tf.reduce_mean((ret_ph - v)**2)
# Info (useful to watch during learning)
approx_kl = tf.reduce_mean(
logp_old_ph -
logp) # a sample estimate for KL-divergence, easy to compute
approx_ent = tf.reduce_mean(
-logp) # a sample estimate for entropy, also easy to compute
# Optimizers
train_pi = tf.train.AdamOptimizer(learning_rate=lr).minimize(pi_loss)
train_v = tf.train.AdamOptimizer(learning_rate=lr).minimize(v_loss)
sess = tf.Session()
sess.run(tf.global_variables_initializer())
def update():
buffer_data = buf.get()
#util.plot_adv(data[0] * act_high, data[1], logger.output_dir + "/ep_adv%s.png" % epoch)
inputs = {k: v for k, v in zip(all_phs, buffer_data)}
pi_l_old, v_l_old, ent = sess.run([pi_loss, v_loss, approx_ent],
feed_dict=inputs)
sess.run(train_pi, feed_dict=inputs)
# Training
for _ in range(train_v_iters):
sess.run(train_v, feed_dict=inputs)
# Log changes from update
pi_l_new, v_l_new, kl, v_new = sess.run(
[pi_loss, v_loss, approx_kl, v], feed_dict=inputs)
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
Entropy=ent,
DeltaLossPi=(pi_l_new - pi_l_old),
DeltaLossV=(v_l_new - v_l_old))
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
real_action = env.action_space.default()
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
for t in range(steps_per_epoch):
a, v_t, logp_t = sess.run(get_action_ops,
feed_dict={obs_ph: o.reshape(1, -1)})
buf.store(o, a, r, v_t, logp_t)
logger.store(VVals=v_t)
delta = np.exp(a[0])
delta = np.clip(delta, 0.9, 1.1)
real_action = env.action_space.clip(real_action * delta)
o, r, d, _ = env.step(real_action)
ep_ret += r
ep_len += 1
if ep_len == max_ep_len or t == steps_per_epoch - 1:
last_val = sess.run(v, feed_dict={obs_ph: o.reshape(1, -1)})
#print(last_val)
buf.finish_path(last_val)
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
real_action = env.action_space.default()
# Perform PPO update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
def ddpg(env_name,
actor_critic=core.mlp_actor_critic,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=5000,
epochs=100,
replay_size=int(1e6),
gamma=0.99,
polyak=0.995,
pi_lr=1e-3,
q_lr=1e-3,
batch_size=100,
start_steps=10000,
act_noise=0.1,
max_ep_len=1000,
logger_kwargs=dict(),
save_freq=1,
test=False):
"""
Args:
env_fn : A function which creates a copy of the environment.
The environment must satisfy the OpenAI Gym API.
actor_critic: A function which takes in placeholder symbols
for state, ``x_ph``, and action, ``a_ph``, and returns the main
outputs from the agent's Tensorflow computation graph:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``pi`` (batch, act_dim) | Deterministically computes actions
| from policy given states.
``q`` (batch,) | Gives the current estimate of Q* for
| states in ``x_ph`` and actions in
| ``a_ph``.
``q_pi`` (batch,) | Gives the composition of ``q`` and
| ``pi`` for states in ``x_ph``:
| q(x, pi(x)).
=========== ================ ======================================
ac_kwargs (dict): Any kwargs appropriate for the actor_critic
function you provided to DDPG.
seed (int): Seed for random number generators.
steps_per_epoch (int): Number of steps of interaction (state-action pairs)
for the agent and the environment in each epoch.
epochs (int): Number of epochs to run and train agent.
replay_size (int): Maximum length of replay buffer.
gamma (float): Discount factor. (Always between 0 and 1.)
polyak (float): Interpolation factor in polyak averaging for target
networks. Target networks are updated towards main networks
according to:
.. math:: \\theta_{\\text{targ}} \\leftarrow
\\rho \\theta_{\\text{targ}} + (1-\\rho) \\theta
where :math:`\\rho` is polyak. (Always between 0 and 1, usually
close to 1.)
pi_lr (float): Learning rate for policy.
q_lr (float): Learning rate for Q-networks.
batch_size (int): Minibatch size for SGD.
start_steps (int): Number of steps for uniform-random action selection,
before running real policy. Helps exploration.
act_noise (float): Stddev for Gaussian exploration noise added to
policy at training time. (At test time, no noise is added.)
max_ep_len (int): Maximum length of trajectory / episode / rollout.
logger_kwargs (dict): Keyword args for EpochLogger.
save_freq (int): How often (in terms of gap between epochs) to save
the current policy and value function.
"""
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
tf.set_random_seed(seed)
np.random.seed(seed)
env, test_env = gym.make(env_name), gym.make(env_name)
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
# Action limit for clamping: critically, assumes all dimensions share the same bound!
act_limit = env.action_space.high[0]
# Share information about action space with policy architecture
ac_kwargs['action_space'] = env.action_space
# Inputs to computation graph
x_ph, a_ph, x2_ph, r_ph, d_ph = core.placeholders(obs_dim, act_dim,
obs_dim, None, None)
# Main outputs from computation graph
with tf.variable_scope('main'):
pi, q, q_pi = actor_critic(x_ph, a_ph, **ac_kwargs)
# Target networks
with tf.variable_scope('target'):
# Note that the action placeholder going to actor_critic here is
#irrelevant, because we only need q_targ(s, pi_targ(s)).
pi_targ, _, q_pi_targ = actor_critic(x2_ph, a_ph, **ac_kwargs)
# Experience buffer
replay_buffer = ReplayBuffer(obs_dim=obs_dim,
act_dim=act_dim,
size=replay_size)
# Count variables
var_counts = tuple(
core.count_vars(scope) for scope in ['main/pi', 'main/q', 'main'])
print('\nNumber of parameters: \t pi: %d, \t q: %d, \t total: %d\n' %
var_counts)
# Bellman backup for Q function
backup = tf.stop_gradient(r_ph + gamma * (1 - d_ph) * q_pi_targ)
# DDPG losses
pi_loss = -tf.reduce_mean(q_pi)
q_loss = tf.reduce_mean((q - backup)**2)
# Separate train ops for pi, q
pi_optimizer = tf.train.AdamOptimizer(learning_rate=pi_lr)
q_optimizer = tf.train.AdamOptimizer(learning_rate=q_lr)
train_pi_op = pi_optimizer.minimize(pi_loss, var_list=get_vars('main/pi'))
train_q_op = q_optimizer.minimize(q_loss, var_list=get_vars('main/q'))
# Polyak averaging for target variables
target_update = tf.group([
tf.assign(v_targ, polyak * v_targ + (1 - polyak) * v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
# Initializing targets to match main variables
target_init = tf.group([
tf.assign(v_targ, v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
sess = tf.Session()
sess.run(tf.global_variables_initializer())
sess.run(target_init)
# Setup model saving
logger.setup_tf_saver(sess,
inputs={
'x': x_ph,
'a': a_ph
},
outputs={
'pi': pi,
'q': q
})
saver = tf.train.Saver()
save_path = './saved_model/' + env_name + '/test'
def get_action(o, noise_scale):
a = sess.run(pi, feed_dict={x_ph: o.reshape(1, -1)})[0]
a += noise_scale * np.random.randn(act_dim)
return np.clip(a, -act_limit, act_limit)
def test_agent(n=10):
for j in range(n):
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0, 0
while not (d or (ep_len == max_ep_len)):
# Take deterministic actions at test time (noise_scale=0)
o, r, d, _ = test_env.step(get_action(o, 0))
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
def save(saver, sess):
if not os.path.exists('./saved_model/' + env_name):
os.mkdir('./saved_model/' + env_name)
ckpt_path = saver.save(sess, save_path)
#print('Save ckpt file: {}'.format(ckpt_path))
def load(saver, sess):
if os.path.exists('./saved_model/' + env_name):
saver.restore(sess, save_path)
print('Load model complete.')
else:
print('There is no saved model.')
if test is False:
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
total_steps = steps_per_epoch * epochs
# Main loop: collect experience in env and update/log each epoch
for t in range(total_steps):
"""
Until start_steps have elapsed, randomly sample actions
from a uniform distribution for better exploration. Afterwards,
use the learned policy (with some noise, via act_noise).
"""
if t > start_steps:
a = get_action(o, act_noise)
else:
a = env.action_space.sample()
# Step the env
o2, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
# Ignore the "done" signal if it comes from hitting the time
# horizon (that is, when it's an artificial terminal signal
# that isn't based on the agent's state)
d = False if ep_len == max_ep_len else d
# Store experience to replay buffer
replay_buffer.store(o, a, r, o2, d)
# Super critical, easy to overlook step: make sure to update
# most recent observation!
o = o2
if d or (ep_len == max_ep_len):
"""
Perform all DDPG updates at the end of the trajectory,
in accordance with tuning done by TD3 paper authors.
"""
for _ in range(ep_len):
batch = replay_buffer.sample_batch(batch_size)
feed_dict = {
x_ph: batch['obs1'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done']
}
# Q-learning update
outs = sess.run([q_loss, q, train_q_op], feed_dict)
logger.store(LossQ=outs[0], QVals=outs[1])
# Policy update
outs = sess.run([pi_loss, train_pi_op, target_update],
feed_dict)
logger.store(LossPi=outs[0])
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# End of epoch wrap-up
if t > 0 and t % steps_per_epoch == 0:
epoch = t // steps_per_epoch
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
#logger.save_state({'env': env}, None)
save(saver, sess)
# Test the performance of the deterministic version of the agent.
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('QVals', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
#save(saver, sess)
else:
load(saver, sess)
test_logger = EpochLogger()
o, r, d, ep_ret, ep_len, n = env.reset(), 0, False, 0, 0, 0
num_episodes = 100
render = True
max_ep_len = 0
while n < num_episodes:
if render:
env.render()
time.sleep(1e-3)
a = get_action(o, 0)
o, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
if d or (ep_len == max_ep_len):
test_logger.store(EpRet=ep_ret, EpLen=ep_len)
print('Episode %d \t EpRet %.3f \t EpLen %d' %
(n, ep_ret, ep_len))
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
n += 1
test_logger.log_tabular('EpRet', with_min_and_max=True)
test_logger.log_tabular('EpLen', average_only=True)
test_logger.dump_tabular()
returns = tf.placeholder(dtype=tf.float32, shape=[
None,
])
advs = tf.placeholder(dtype=tf.float32, shape=[
None,
])
log_policy = tf.placeholder(dtype=tf.float32, shape=[
None,
])
return PlaceHolders(states=states,
returns=returns,
log_policy=log_policy,
advs=advs)
logger = EpochLogger()
env = gym.make('LunarLander-v2')
state_size = env.observation_space.shape[0]
action_size = env.action_space.n
storage = Storage(steps_per_epoch, action_size, state_size)
ph = create_placeholders(state_size)
actor = build_nets(ph.states, action_size)
ratio = tf.exp(actor.log_policy - ph.log_policy)
min_adv = tf.where(ph.advs > 0, (1 + clip_ratio) * ph.advs,
(1 - clip_ratio) * ph.advs)
pi_loss = -tf.reduce_mean(tf.minimum(ratio * ph.advs, min_adv))
v_loss = tf.reduce_mean((ph.returns - actor.baselines)**2)
def ppo(env_config, ac_type, ac_kwargs, clip_ratio, epochs, steps_per_epoch,
optimizer, lr, train_pi_iters, max_ep_len, target_kl, logger_kwargs,
seed):
logger = EpochLogger(**logger_kwargs)
configs = locals().copy()
configs.pop("logger")
logger.save_config(configs)
tf.set_random_seed(seed)
np.random.seed(seed)
env = make_env(env_config)
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
act_high = env.action_space.high
obs_ph, a_ph, adv_ph, logp_old_ph = core.placeholders(
obs_dim, act_dim, None, None)
all_phs = [obs_ph, a_ph, adv_ph, logp_old_ph]
actor_critic = get_ppo_actor_critic(ac_type)
pi, logp, logp_pi = actor_critic(obs_ph, a_ph, **ac_kwargs)
# Experience buffer
buf = PPOBuffer(obs_dim, act_dim, steps_per_epoch)
# PPO objectives
ratio = tf.exp(logp - logp_old_ph) # pi(a|s) / pi_old(a|s)
min_adv = tf.where(adv_ph > 0, (1 + clip_ratio) * adv_ph,
(1 - clip_ratio) * adv_ph)
# Info (useful to watch during learning)
approx_kl = tf.reduce_mean(
logp_old_ph -
logp) # a sample estimate for KL-divergence, easy to compute
approx_ent = tf.reduce_mean(
-logp) # a sample estimate for entropy, also easy to compute
clipped = tf.logical_or(ratio > (1 + clip_ratio), ratio < (1 - clip_ratio))
clipfrac = tf.reduce_mean(tf.cast(clipped, tf.float32))
pi_loss = -tf.reduce_mean(tf.minimum(ratio * adv_ph, min_adv))
# Optimizers
if optimizer == "adam":
train_pi = tf.train.AdamOptimizer(learning_rate=lr).minimize(pi_loss)
elif optimizer == "sgd":
train_pi = tf.train.GradientDescentOptimizer(
learning_rate=lr).minimize(pi_loss)
sess = tf.Session()
sess.run(tf.global_variables_initializer())
def update():
print(sess.run(tf.trainable_variables()))
data = buf.get()
#util.plot_adv(data[0] * act_high, data[1], logger.output_dir + "/ep_adv%s.png" % epoch)
inputs = {k: v for k, v in zip(all_phs, data[:4])}
pi_l_old, ent = sess.run([pi_loss, approx_ent], feed_dict=inputs)
# Training
for i in range(train_pi_iters):
_, kl = sess.run([train_pi, approx_kl], feed_dict=inputs)
if kl > 1.5 * target_kl:
logger.log(
'Early stopping at step %d due to reaching max kl.' % i)
break
logger.store(StopIter=i)
# Log changes from update
pi_l_new, kl, cf = sess.run([pi_loss, approx_kl, clipfrac],
feed_dict=inputs)
logger.store(LossPi=pi_l_old,
KL=kl,
Entropy=ent,
ClipFrac=cf,
DeltaLossPi=(pi_l_new - pi_l_old))
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
real_action = env.action_space.default()
o, r, d, _ = env.step(real_action)
episode_actions = []
episode_obs = []
episode_actions.append(real_action)
episode_obs.append(o)
print(tf.trainable_variables())
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
episode_count = 0
ep_actions = []
for t in range(steps_per_epoch):
a, logp_t = sess.run([pi, logp_pi],
feed_dict={obs_ph: o.reshape(1, -1)})
delta = np.exp(a[0])
delta = np.clip(delta, 0.95, 1.05)
real_action = env.action_space.clip(real_action * delta)
o, r, d, _ = env.step(real_action)
buf.store(o, a, r, logp_t)
ep_actions.append(real_action)
episode_actions.append(real_action)
episode_obs.append(o)
ep_ret += r
ep_len += 1
if ep_len == max_ep_len or t == steps_per_epoch - 1:
buf.finish_path()
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
real_action = env.action_space.default()
o, r, d, _ = env.step(real_action)
util.plot_seq_obs_and_actions(
episode_obs, episode_actions, act_high, logger.output_dir +
'/episode_actions_%d_%d.png' % (epoch, episode_count))
episode_count += 1
episode_actions = []
episode_obs = []
episode_actions.append(real_action)
episode_obs.append(o)
# Perform PPO update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
util.plot_actions(ep_actions, act_high,
logger.output_dir + '/ep_actions%d.png' % epoch)
def sac(env_fn,
seed=0,
gamma=.99,
lam=.97,
hidden_sizes=(200, 100),
alpha=.0,
v_lr=1e-3,
q_lr=1e-3,
pi_lr=1e-3,
polyak=1e-2,
epochs=50,
steps_per_epoch=1000,
batch_size=100,
start_steps=1000,
logger_kwargs=dict(),
replay_size=int(1e6),
max_ep_len=1000,
save_freq=1):
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
tf.set_random_seed(seed)
np.random.seed(seed)
env, test_env = env_fn(), env_fn()
env = env_fn()
# Dimensions
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.n
# act_limit = env.action_space.high[0]
# Placeholders
x_ph = tf.placeholder(shape=[None, obs_dim], dtype=tf.float32)
a_ph = tf.placeholder(shape=[None, 1], dtype=tf.float32)
x2_ph = tf.placeholder(shape=[None, obs_dim], dtype=tf.float32)
r_ph = tf.placeholder(shape=[None], dtype=tf.float32)
d_ph = tf.placeholder(shape=[None], dtype=tf.float32)
# Networks
def mlp(x,
hidden_sizes=(32, ),
activation=tf.tanh,
output_activation=None):
for h in hidden_sizes[:-1]:
x = tf.layers.dense(x, units=h, activation=activation)
return tf.layers.dense(x,
units=hidden_sizes[-1],
activation=output_activation)
def mlp_categorical_policy(x, a, hidden_sizes, activation,
output_activation, action_space):
act_dim = action_space.n
logits = mlp(x, list(hidden_sizes) + [act_dim], activation, None)
pi_all = tf.nn.softmax(logits)
logpi_all = tf.nn.log_softmax(logits)
# pi = tf.squeeze(tf.random.categorical(logits,1), axis=1)
pi = tf.random.categorical(logits, 1)
# a = tf.cast( a, tf.uint8)
# logp = tf.reduce_sum(tf.one_hot(a, depth=act_dim) * logp_all, axis=1)
# logp_pi = tf.reduce_sum(tf.one_hot( tf.squeeze( pi, axis=1), depth=act_dim) * logp_all, axis=1)
return pi, pi_all, logpi_all
LOG_STD_MIN = -20
LOG_STD_MAX = 2
with tf.variable_scope("main"):
activation = tf.tanh
with tf.variable_scope("pi"):
pi, pi_all, logpi_all = mlp_categorical_policy(
x_ph, a_ph, hidden_sizes, activation, None, env.action_space)
print("### DEBUG @ main-discrete.py pi and others' dimensions")
print(pi)
print(pi_all)
print(logpi_all)
input()
with tf.variable_scope("q1"):
q1 = tf.squeeze(mlp(tf.concat([x_ph, a_ph], -1),
hidden_sizes + (act_dim, ), activation, None),
axis=-1)
with tf.variable_scope("q1", reuse=True):
q1_pi = tf.squeeze(mlp(
tf.concat([x_ph, tf.cast(pi, tf.float32)], axis=-1),
hidden_sizes + (act_dim, ), activation, None),
axis=-1)
with tf.variable_scope("q2"):
q2 = tf.squeeze(mlp(tf.concat([x_ph, a_ph], -1),
hidden_sizes + (act_dim, ), activation, None),
axis=-1)
with tf.variable_scope("q2", reuse=True):
q2_pi = tf.squeeze(mlp(
tf.concat([x_ph, tf.cast(pi, tf.float32)], -1),
hidden_sizes + (act_dim, ), activation, None),
axis=-1)
with tf.variable_scope("v"):
# v = mlp( x_ph, hidden_sizes+(1,), activation, None)
v = tf.squeeze(mlp(x_ph, hidden_sizes + (1, ), activation, None),
axis=-1)
with tf.variable_scope("target"):
with tf.variable_scope("v"):
v_targ = tf.squeeze(mlp(x2_ph, hidden_sizes + (1, ), activation,
None),
axis=-1)
# helpers for var count
def get_vars(scope=''):
return [x for x in tf.trainable_variables() if scope in x.name]
def count_vars(scope=''):
v = get_vars(scope)
return sum([np.prod(var.shape.as_list()) for var in v])
# Count variables
var_counts = tuple(
count_vars(scope)
for scope in ['main/pi', 'main/q1', 'main/q2', 'main/v', 'main'])
print(
'\nNumber of parameters: \t pi: %d, \t q1: %d, \t q2: %d, \t v: %d, \t total: %d\n'
% var_counts)
# Targets
q_backup_prestop = r_ph + gamma * (1 - d_ph) * v_targ
v_backup_prestop = tf.minimum(q1_pi, q2_pi) - alpha * logp_pi
q_backup, v_backup = tf.stop_gradient(q_backup_prestop), tf.stop_gradient(
v_backup_prestop)
# Q Loss
q1_loss = tf.reduce_mean((q1 - q_backup)**2)
q2_loss = tf.reduce_mean((q2 - q_backup)**2)
q_loss = q1_loss + q2_loss
# V Loss
v_loss = tf.reduce_mean((v - v_backup)**2)
# Pol loss
pi_loss = tf.reduce_mean(-q1_pi + alpha * logp_pi)
# Training ops
v_trainop = tf.train.AdamOptimizer(v_lr).minimize(
v_loss,
var_list=tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope="main/v"))
q_trainop = tf.train.AdamOptimizer(q_lr).minimize(
q_loss,
var_list=tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope="main/q"))
pi_trainop = tf.train.AdamOptimizer(pi_lr).minimize(
pi_loss,
var_list=tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope="main/pi"))
assert polyak <= .5
# Target update op
init_v_target = tf.group([
tf.assign(v_target, v_main) for v_main, v_target in zip(
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="main/v"),
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="target/v"))
])
update_v_target = tf.group([
tf.assign(v_target, (1 - polyak) * v_target + polyak * v_main)
for v_main, v_target in zip(
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="main/v"),
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="target/v"))
])
sess = tf.Session()
sess.run(tf.global_variables_initializer())
sess.run(init_v_target)
# Setup model saving
logger.setup_tf_saver(sess,
inputs={
'x': x_ph,
'a': a_ph
},
outputs={
'pi': pi,
'q1': q1,
'q2': q2,
'v': v
})
def test_agent(n=10):
for j in range(n):
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0, 0
# print( o.reshape(-1, 1))
# input()
while not (d or (ep_len == max_ep_len)):
o, r, d, _ = test_env.step(
sess.run(pi, feed_dict={x_ph: o.reshape(1, -1)})[0][0])
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
#Buffer init
buffer = ReplayBuffer(obs_dim, 1, replay_size)
# Main loop
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
total_steps = steps_per_epoch * epochs
for t in range(total_steps):
if t > start_steps:
a = sess.run(pi, feed_dict={x_ph: o.reshape(1, -1)})[0][0]
else:
a = env.action_space.sample()
o2, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
d = False or (ep_len == max_ep_len)
# Still needed ?
o2 = np.squeeze(o2)
buffer.store(o, a, r, o2, d)
o = o2
if d or (ep_len == max_ep_len):
for j in range(ep_len):
batch = buffer.sample_batch(batch_size)
feed_dict = {
x_ph: batch['obs'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done']
}
# DEBUG:
# v_backup_prestop_out = sess.run( v_backup_prestop, feed_dict=feed_dict)
# print( v_backup_prestop_out.shape)
# print( v_backup_prestop_out)
# input()
# Value gradient steps
v_step_ops = [v_loss, v, v_trainop]
outs = sess.run(v_step_ops, feed_dict)
logger.store(LossV=outs[0], VVals=outs[1])
# Q Gradient steps
q_step_ops = [q_loss, q1, q2, q_trainop]
outs = sess.run(q_step_ops, feed_dict)
logger.store(LossQ=outs[0], Q1Vals=outs[1], Q2Vals=outs[2])
# Policy gradient steps
# TODO Add entropy logging
pi_step_ops = [pi_loss, pi_trainop, update_v_target]
outs = sess.run(pi_step_ops, feed_dict=feed_dict)
logger.store(LossPi=outs[0])
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0., 0
if t > 0 and t % steps_per_epoch == 0:
epoch = t // steps_per_epoch
# Saving the model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('Q1Vals', with_min_and_max=True)
logger.log_tabular('Q2Vals', with_min_and_max=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
class Test:
def __init__(self, args):
self.args = args
self.env = gym.make(args.env_name)
self.env_params = get_env_params(self.env)
self.video_file = 'data_test/test_video'
self.output_dir = 'data_test'
self.exp_name = 'test'
self.logger = EpochLogger(output_dir=self.output_dir,
exp_name=self.exp_name)
# self.env = wrappers.Monitor(self.env, self.video_file, force=True)
device = 'cuda' if args.cuda else 'cpu'
self.device = torch.device(device)
# load
data_file = os.path.join(args.load_fold, 'vars.pkl')
data = joblib.load(data_file)
## load obs_mean obs_std g_mean g_std
self.obs_mean = data['observation_mean']
self.obs_std = data['observation_std']
## load policy model
model = {
'ddpg': actor,
'td3': actor,
'sac': actor_sac,
'gac': actor_gac
}
self.actor_network = model[args.alg](self.env_params).to(self.device)
model_file = os.path.join(args.load_fold, 'pyt_save', 'model.pt')
self.actor_network.load_state_dict(torch.load(model_file))
def run(self):
self._eval_agent()
self.logger.log_tabular('EpReward')
self.logger.log_tabular('EpCost')
self.logger.dump_tabular()
def _preproc_inputs(self, obs):
obs_norm = np.clip((obs - self.obs_mean) / self.obs_std,
-self.args.clip_range, self.args.clip_range)
# concatenate the stuffs
inputs = torch.tensor(obs_norm, dtype=torch.float32).unsqueeze(0)
if self.args.cuda:
inputs = inputs.cuda(self.device)
return inputs
def _eval_agent(self):
for _ in range(self.args.n_test_rollouts):
obs, ep_reward, ep_cost = self.env.reset(), 0, 0
for _ in range(self.env_params['max_timesteps']):
if self.args.render:
self.env.render()
time.sleep(1e-3)
with torch.no_grad():
input_tensor = self._preproc_inputs(obs)
if self.args.alg == 'gac':
pi = self.actor_network(input_tensor, std=0.5)
elif self.args.alg == 'sac':
pi, _ = self.actor_network(input_tensor)
else:
pi = self.actor_network(input_tensor)
# convert the actions
actions = pi.detach().cpu().numpy().squeeze()
obs, reward, cost, info = self.env.step(actions)
ep_reward += reward
ep_cost += cost
self.logger.store(EpReward=ep_reward, EpCost=ep_cost)
def ppo(env_fn,
actor_critic=core.MLPActorCritic,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=4000,
epochs=50,
gamma=0.99,
clip_ratio=0.2,
pi_lr=3e-4,
vf_lr=1e-3,
train_pi_iters=80,
train_v_iters=80,
lam=0.97,
max_ep_len=None,
target_kl=0.01,
logger_kwargs=dict(),
save_freq=10,
TensorBoard=True,
save_nn=True,
save_every=1000,
load_latest=False,
load_custom=False,
LoadPath=None,
RTA_type=None):
"""
Proximal Policy Optimization (by clipping),
with early stopping based on approximate KL
Args:
env_fn : A function which creates a copy of the environment.
The environment must satisfy the OpenAI Gym API.
actor_critic: The constructor method for a PyTorch Module with a
``step`` method, an ``act`` method, a ``pi`` module, and a ``v``
module. The ``step`` method should accept a batch of observations
and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``a`` (batch, act_dim) | Numpy array of actions for each
| observation.
``v`` (batch,) | Numpy array of value estimates
| for the provided observations.
``logp_a`` (batch,) | Numpy array of log probs for the
| actions in ``a``.
=========== ================ ======================================
The ``act`` method behaves the same as ``step`` but only returns ``a``.
The ``pi`` module's forward call should accept a batch of
observations and optionally a batch of actions, and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``pi`` N/A | Torch Distribution object, containing
| a batch of distributions describing
| the policy for the provided observations.
``logp_a`` (batch,) | Optional (only returned if batch of
| actions is given). Tensor containing
| the log probability, according to
| the policy, of the provided actions.
| If actions not given, will contain
| ``None``.
=========== ================ ======================================
The ``v`` module's forward call should accept a batch of observations
and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``v`` (batch,) | Tensor containing the value estimates
| for the provided observations. (Critical:
| make sure to flatten this!)
=========== ================ ======================================
ac_kwargs (dict): Any kwargs appropriate for the ActorCritic object
you provided to PPO.
seed (int): Seed for random number generators.
steps_per_epoch (int): Number of steps of interaction (state-action pairs)
for the agent and the environment in each epoch.
epochs (int): Number of epochs of interaction (equivalent to
number of policy updates) to perform.
gamma (float): Discount factor. (Always between 0 and 1.)
clip_ratio (float): Hyperparameter for clipping in the policy objective.
Roughly: how far can the new policy go from the old policy while
still profiting (improving the objective function)? The new policy
can still go farther than the clip_ratio says, but it doesn't help
on the objective anymore. (Usually small, 0.1 to 0.3.) Typically
denoted by :math:`\epsilon`.
pi_lr (float): Learning rate for policy optimizer.
vf_lr (float): Learning rate for value function optimizer.
train_pi_iters (int): Maximum number of gradient descent steps to take
on policy loss per epoch. (Early stopping may cause optimizer
to take fewer than this.)
train_v_iters (int): Number of gradient descent steps to take on
value function per epoch.
lam (float): Lambda for GAE-Lambda. (Always between 0 and 1,
close to 1.)
max_ep_len (int): Maximum length of trajectory / episode / rollout.
target_kl (float): Roughly what KL divergence we think is appropriate
between new and old policies after an update. This will get used
for early stopping. (Usually small, 0.01 or 0.05.)
logger_kwargs (dict): Keyword args for EpochLogger.
save_freq (int): How often (in terms of gap between epochs) to save
the current policy and value function.
TensorBoard (bool): True plots to TensorBoard, False does not
save_nn (bool): True saves neural network data, False does not
save_every (int): How often to save neural network
load_latest (bool): Load last saved neural network data before training
load_custom (bool): Load custom neural network data file before training
LoadPath (str): Path for custom neural network data file
RTA_type (str): RTA framework, either 'CBF', 'SVL', 'ASIF', or
'SBSF'
"""
# Special function to avoid certain slowdowns from PyTorch + MPI combo.
setup_pytorch_for_mpi()
# Set up logger and save configuration
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
# Instantiate environment
env = env_fn()
obs_dim = env.observation_space.shape
act_dim = env.action_space.shape
# Random seed for each cpu
seed += 1 * proc_id()
env.seed(seed)
# Create actor-critic module
ac = actor_critic(env.observation_space, env.action_space, **ac_kwargs)
# Load model if True
if load_latest:
models = glob.glob(f"{PATH}/models/PPO/*")
LoadPath = max(models, key=os.path.getctime)
ac.load_state_dict(torch.load(LoadPath))
elif load_custom:
ac.load_state_dict(torch.load(LoadPath))
# Sync params across processes
sync_params(ac)
# Count variables
var_counts = tuple(core.count_vars(module) for module in [ac.pi, ac.v])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n' % var_counts)
# Set up experience buffer
local_steps_per_epoch = int(steps_per_epoch / num_procs())
buf = PPOBuffer(obs_dim, act_dim, local_steps_per_epoch, gamma, lam)
# Set up function for computing PPO policy loss
def compute_loss_pi(data):
obs, act, adv, logp_old = data['obs'], data['act'], data['adv'], data[
'logp']
# Policy loss
pi, logp = ac.pi(obs, act)
ratio = torch.exp(logp - logp_old)
clip_adv = torch.clamp(ratio, 1 - clip_ratio, 1 + clip_ratio) * adv
loss_pi = -(torch.min(ratio * adv, clip_adv)).mean()
# Useful extra info
approx_kl = (logp_old - logp).mean().item()
ent = pi.entropy().mean().item()
clipped = ratio.gt(1 + clip_ratio) | ratio.lt(1 - clip_ratio)
clipfrac = torch.as_tensor(clipped, dtype=torch.float32).mean().item()
pi_info = dict(kl=approx_kl, ent=ent, cf=clipfrac)
return loss_pi, pi_info
# Set up function for computing value loss
def compute_loss_v(data):
obs, ret = data['obs'], data['ret']
return ((ac.v(obs) - ret)**2).mean()
# Set up optimizers for policy and value function
pi_optimizer = Adam(ac.pi.parameters(), lr=pi_lr)
vf_optimizer = Adam(ac.v.parameters(), lr=vf_lr)
# Set up model saving
logger.setup_pytorch_saver(ac)
def update():
data = buf.get()
pi_l_old, pi_info_old = compute_loss_pi(data)
pi_l_old = pi_l_old.item()
v_l_old = compute_loss_v(data).item()
# Train policy with multiple steps of gradient descent
for i in range(train_pi_iters):
pi_optimizer.zero_grad()
loss_pi, pi_info = compute_loss_pi(data)
kl = mpi_avg(pi_info['kl'])
if kl > 1.5 * target_kl:
logger.log(
'Early stopping at step %d due to reaching max kl.' % i)
break
loss_pi.backward()
mpi_avg_grads(ac.pi) # average grads across MPI processes
pi_optimizer.step()
logger.store(StopIter=i)
# Value function learning
for i in range(train_v_iters):
vf_optimizer.zero_grad()
loss_v = compute_loss_v(data)
loss_v.backward()
mpi_avg_grads(ac.v) # average grads across MPI processes
vf_optimizer.step()
# Log changes from update
kl, ent, cf = pi_info['kl'], pi_info_old['ent'], pi_info['cf']
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
Entropy=ent,
ClipFrac=cf,
DeltaLossPi=(loss_pi.item() - pi_l_old),
DeltaLossV=(loss_v.item() - v_l_old))
# Import RTA
if RTA_type == 'CBF':
from CBF_for_speed_limit import RTA
elif RTA_type == 'SVL':
from Simple_velocity_limit import RTA
elif RTA_type == 'ASIF':
from IASIF import RTA
elif RTA_type == 'SBSF':
from ISimplex import RTA
# Call RTA, define action conversion
if RTA_type != 'off':
env.RTA_reward = RTA_type
rta = RTA(env)
def RTA_act(obs, act):
act = np.clip(act, -env.force_magnitude, env.force_magnitude)
x0 = [obs[0], obs[1], 0, obs[2], obs[3], 0]
u_des = np.array([[act[0]], [act[1]], [0]])
u = rta.main(x0, u_des)
new_act = [u[0, 0], u[1, 0]]
if np.sqrt((act[0] - new_act[0])**2 +
(act[1] - new_act[1])**2) < 0.0001:
env.RTA_on = False
else:
env.RTA_on = True
return new_act
# Prepare for interaction with environment
start_time = time.time()
o, ep_ret, ep_len = env.reset(), 0, 0
total_episodes = 0
RTA_percent = 0
# Create TensorBoard file if True
if TensorBoard and proc_id() == 0:
if env_name == 'spacecraft-docking-continuous-v0' or env_name == 'spacecraft-docking-v0':
Name = f"{PATH}/runs/Spacecraft-docking-" + current_time
elif env_name == 'dubins-aircraft-v0' or env_name == 'dubins-aircraft-continuous-v0':
Name = f"{PATH}/runs/Dubins-aircraft-" + current_time
writer = SummaryWriter(Name)
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
batch_ret = [] # Track episode returns
batch_len = [] # Track episode lengths
batch_RTA_percent = [] # Track precentage of time RTA is on
env.success = 0 # Track episode success rate
env.failure = 0 # Track episode failure rate
env.crash = 0 # Track episode crash rate
env.overtime = 0 # Track episode over max time/control rate
episodes = 0 # Track episodes
delta_v = [] # Track episode total delta v
for t in range(local_steps_per_epoch):
a, v, logp = ac.step(torch.as_tensor(o, dtype=torch.float32))
if RTA_type != 'off': # If RTA is on, get RTA action
RTA_a = RTA_act(o, a)
if env.RTA_on:
RTA_percent += 1
next_o, r, d, _ = env.step(RTA_a)
else: # If RTA is off, pass through desired action
next_o, r, d, _ = env.step(a)
if env_name == 'spacecraft-docking-continuous-v0' or env_name == 'spacecraft-docking-v0':
over_max_vel, _, _ = env.check_velocity(a[0], a[1])
if over_max_vel:
RTA_percent += 1
ep_ret += r
ep_len += 1
# save and log
buf.store(o, a, r, v, logp)
logger.store(VVals=v)
# Update obs (critical!)
o = next_o
timeout = ep_len == max_ep_len
terminal = d or timeout
epoch_ended = t == local_steps_per_epoch - 1
if terminal or epoch_ended:
if epoch_ended and not (terminal):
print('Warning: trajectory cut off by epoch at %d steps.' %
ep_len,
flush=True)
# if trajectory didn't reach terminal state, bootstrap value target
if timeout or epoch_ended:
_, v, _ = ac.step(torch.as_tensor(o, dtype=torch.float32))
else:
v = 0
buf.finish_path(v)
if terminal:
# only save EpRet / EpLen if trajectory finished
logger.store(EpRet=ep_ret, EpLen=ep_len)
batch_ret.append(ep_ret)
batch_len.append(ep_len)
episodes += 1
if env_name == 'spacecraft-docking-continuous-v0' or env_name == 'spacecraft-docking-v0':
delta_v.append(env.control_input / env.mass_deputy)
batch_RTA_percent.append(RTA_percent / ep_len * 100)
RTA_percent = 0
o, ep_ret, ep_len = env.reset(), 0, 0
total_episodes += episodes
# Track success, failure, crash, overtime rates
if episodes != 0:
success_rate = env.success / episodes
failure_rate = env.failure / episodes
crash_rate = env.crash / episodes
overtime_rate = env.overtime / episodes
else:
success_rate = 0
failure_rate = 0
crash_rate = 0
overtime_rate = 0
raise (
"No completed episodes logging will break [increase steps per epoch]"
)
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
# Perform PPO update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts', (epoch + 1) * steps_per_epoch)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
# Average data over all cpus
avg_batch_ret = mpi_avg(np.mean(batch_ret))
avg_batch_len = mpi_avg(np.mean(batch_len))
avg_success_rate = mpi_avg(success_rate)
avg_failure_rate = mpi_avg(failure_rate)
avg_crash_rate = mpi_avg(crash_rate)
avg_overtime_rate = mpi_avg(overtime_rate)
if env_name == 'spacecraft-docking-continuous-v0' or env_name == 'spacecraft-docking-v0':
avg_delta_v = mpi_avg(np.mean(delta_v))
avg_RTA_percent = mpi_avg(np.mean(batch_RTA_percent))
if proc_id() == 0: # Only on one cpu
# Plot to TensorBoard if True, only on one cpu
if TensorBoard:
writer.add_scalar('Return', avg_batch_ret, epoch)
writer.add_scalar('Episode-Length', avg_batch_len * env.tau,
epoch)
writer.add_scalar('Success-Rate', avg_success_rate * 100,
epoch)
writer.add_scalar('Failure-Rate', avg_failure_rate * 100,
epoch)
writer.add_scalar('Crash-Rate', avg_crash_rate * 100, epoch)
writer.add_scalar('Overtime-Rate', avg_overtime_rate * 100,
epoch)
if env_name == 'spacecraft-docking-continuous-v0' or env_name == 'spacecraft-docking-v0':
writer.add_scalar('Delta-V', avg_delta_v, epoch)
writer.add_scalar('RTA-on-percent', avg_RTA_percent, epoch)
# Save neural network if true, can change to desired location
if save_nn and epoch % save_every == 0 and epoch != 0:
if not os.path.isdir(f"{PATH}/models"):
os.mkdir(f"{PATH}/models")
if not os.path.isdir(f"{PATH}/models/PPO"):
os.mkdir(f"{PATH}/models/PPO")
if env_name == 'spacecraft-docking-continuous-v0' or env_name == 'spacecraft-docking-v0':
Name2 = f"{PATH}/models/PPO/Spacecraft-docking-" + current_time + f"-epoch{epoch}.dat"
elif env_name == 'dubins-aircraft-v0' or env_name == 'dubins-aircraft-continuous-v0':
Name2 = f"{PATH}/models/PPO/Dubins-aircraft-" + current_time + f"-epoch{epoch}.dat"
torch.save(ac.state_dict(), Name2)
# Average episodes per hour, episode per epoch
ep_hr = mpi_avg(total_episodes) * args.cpu / (time.time() -
start_time) * 3600
ep_Ep = mpi_avg(total_episodes) * args.cpu / (epoch + 1)
# Plot on one cpu
if proc_id() == 0:
# Save neural network
if save_nn:
if not os.path.isdir(f"{PATH}/models"):
os.mkdir(f"{PATH}/models")
if not os.path.isdir(f"{PATH}/models/PPO"):
os.mkdir(f"{PATH}/models/PPO")
if env_name == 'spacecraft-docking-continuous-v0' or env_name == 'spacecraft-docking-v0':
Name2 = f"{PATH}/models/PPO/Spacecraft-docking-" + current_time + "-final.dat"
elif env_name == 'dubins-aircraft-v0' or env_name == 'dubins-aircraft-continuous-v0':
Name2 = f"{PATH}/models/PPO/Dubins-aircraft-" + current_time + "-final.dat"
torch.save(ac.state_dict(), Name2)
# Print statistics on episodes
print(
f"Episodes per hour: {ep_hr:.0f}, Episodes per epoch: {ep_Ep:.0f}, Epochs per hour: {(epoch+1)/(time.time()-start_time)*3600:.0f}"
)
def ppo(env_fn,
actor_critic=core.MLPActorCritic,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=4000,
epochs=50,
gamma=0.99,
clip_ratio=0.2,
pi_lr=3e-4,
vf_lr=1e-3,
train_pi_iters=80,
train_v_iters=80,
lam=0.97,
max_ep_len=2000,
target_kl=0.01,
logger_kwargs=dict(),
save_freq=10):
global RENDER, BONUS
"""
Proximal Policy Optimization (by clipping),
with early stopping based on approximate KL
Args:
env_fn : A function which creates a copy of the environment.
The environment must satisfy the OpenAI Gym API.
actor_critic: The constructor method for a PyTorch Module with a
``step`` method, an ``act`` method, a ``pi`` module, and a ``v``
module. The ``step`` method should accept a batch of observations
and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``a`` (batch, act_dim) | Numpy array of actions for each
| observation.
``v`` (batch,) | Numpy array of value estimates
| for the provided observations.
``logp_a`` (batch,) | Numpy array of log probs for the
| actions in ``a``.
=========== ================ ======================================
The ``act`` method behaves the same as ``step`` but only returns ``a``.
The ``pi`` module's forward call should accept a batch of
observations and optionally a batch of actions, and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``pi`` N/A | Torch Distribution object, containing
| a batch of distributions describing
| the policy for the provided observations.
``logp_a`` (batch,) | Optional (only returned if batch of
| actions is given). Tensor containing
| the log probability, according to
| the policy, of the provided actions.
| If actions not given, will contain
| ``None``.
=========== ================ ======================================
The ``v`` module's forward call should accept a batch of observations
and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``v`` (batch,) | Tensor containing the value estimates
| for the provided observations. (Critical:
| make sure to flatten this!)
=========== ================ ======================================
ac_kwargs (dict): Any kwargs appropriate for the ActorCritic object
you provided to PPO.
seed (int): Seed for random number generators.
steps_per_epoch (int): Number of steps of interaction (state-action pairs)
for the agent and the environment in each epoch.
epochs (int): Number of epochs of interaction (equivalent to
number of policy updates) to perform.
gamma (float): Discount factor. (Always between 0 and 1.)
clip_ratio (float): Hyperparameter for clipping in the policy objective.
Roughly: how far can the new policy go from the old policy while
still profiting (improving the objective function)? The new policy
can still go farther than the clip_ratio says, but it doesn't help
on the objective anymore. (Usually small, 0.1 to 0.3.) Typically
denoted by :math:`\epsilon`.
pi_lr (float): Learning rate for policy optimizer.
vf_lr (float): Learning rate for value function optimizer.
train_pi_iters (int): Maximum number of gradient descent steps to take
on policy loss per epoch. (Early stopping may cause optimizer
to take fewer than this.)
train_v_iters (int): Number of gradient descent steps to take on
value function per epoch.
lam (float): Lambda for GAE-Lambda. (Always between 0 and 1,
close to 1.)
max_ep_len (int): Maximum length of trajectory / episode / rollout.
target_kl (float): Roughly what KL divergence we think is appropriate
between new and old policies after an update. This will get used
for early stopping. (Usually small, 0.01 or 0.05.)
logger_kwargs (dict): Keyword args for EpochLogger.
save_freq (int): How often (in terms of gap between epochs) to save
the current policy and value function.
"""
# Reachability Trainer
r_network = R_Network().to(device)
trainer = R_Network_Trainer(r_network=r_network, exp_name="random1")
episodic_memory = EpisodicMemory(embedding_shape=[EMBEDDING_DIM])
# Special function to avoid certain slowdowns from PyTorch + MPI combo.
setup_pytorch_for_mpi()
# Set up logger and save configuration
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
# Random seed
seed += 10000 * proc_id()
torch.manual_seed(seed)
np.random.seed(seed)
# Instantiate environment
env = env_fn()
observation_space = gym.spaces.Box(low=0.0, high=1.0, shape=(3, 64, 64))
action_space = gym.spaces.Discrete(3)
obs_dim = observation_space.shape
act_dim = action_space.shape
# Create actor-critic module
ac = actor_critic(observation_space, action_space, **ac_kwargs)
# Sync params across processes
sync_params(ac)
# Count variables
var_counts = tuple(core.count_vars(module) for module in [ac.pi, ac.v])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n' % var_counts)
# Set up experience buffer
local_steps_per_epoch = int(steps_per_epoch / num_procs())
buf = PPOBuffer(obs_dim, act_dim, local_steps_per_epoch, gamma, lam)
# Set up function for computing PPO policy loss
def compute_loss_pi(data):
obs, act, adv, logp_old = data['obs'], data['act'], data['adv'], data[
'logp']
# Policy loss
pi, logp = ac.pi(obs, act)
ratio = torch.exp(logp - logp_old)
clip_adv = torch.clamp(ratio, 1 - clip_ratio, 1 + clip_ratio) * adv
loss_pi = -(torch.min(ratio * adv, clip_adv)).mean()
# Useful extra info
approx_kl = (logp_old - logp).mean().item()
ent = pi.entropy().mean().item()
clipped = ratio.gt(1 + clip_ratio) | ratio.lt(1 - clip_ratio)
clipfrac = torch.as_tensor(clipped, dtype=torch.float32).mean().item()
pi_info = dict(kl=approx_kl, ent=ent, cf=clipfrac)
return loss_pi, pi_info
# Set up function for computing value loss
def compute_loss_v(data):
obs, ret = data['obs'], data['ret']
return ((ac.v(obs) - ret)**2).mean()
# Set up optimizers for policy and value function
pi_optimizer = Adam(ac.pi.parameters(), lr=pi_lr)
vf_optimizer = Adam(ac.v.parameters(), lr=vf_lr)
# Set up model saving
logger.setup_pytorch_saver(ac)
def update():
data = buf.get()
pi_l_old, pi_info_old = compute_loss_pi(data)
pi_l_old = pi_l_old.item()
v_l_old = compute_loss_v(data).item()
# Train policy with multiple steps of gradient descent
for i in range(train_pi_iters):
pi_optimizer.zero_grad()
loss_pi, pi_info = compute_loss_pi(data)
# Entropy bonus
loss_pi += pi_info['ent'] * 0.0021
kl = mpi_avg(pi_info['kl'])
if kl > 1.5 * target_kl:
logger.log(
'Early stopping at step %d due to reaching max kl.' % i)
break
loss_pi.backward()
mpi_avg_grads(ac.pi) # average grads across MPI processes
pi_optimizer.step()
logger.store(StopIter=i)
# Value function learning
for i in range(train_v_iters):
vf_optimizer.zero_grad()
loss_v = compute_loss_v(data)
loss_v.backward()
mpi_avg_grads(ac.v) # average grads across MPI processes
vf_optimizer.step()
# Log changes from update
kl, ent, cf = pi_info['kl'], pi_info_old['ent'], pi_info['cf']
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
Entropy=ent,
ClipFrac=cf,
DeltaLossPi=(loss_pi.item() - pi_l_old),
DeltaLossV=(loss_v.item() - v_l_old))
# Prepare for interaction with environment
start_time = time.time()
o, _ = env.reset()
env.render()
o = o.astype(np.float32) / 255.
o = o.transpose(2, 0, 1)
ep_ret, ep_len = 0, 0
indices = []
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
for t in range(local_steps_per_epoch):
state = torch.as_tensor(o[np.newaxis, ...], dtype=torch.float32)
a, v, logp = ac.step(state)
next_o, r, d, info = env.step(a)
next_o = next_o.astype(np.float32) / 255.
d = ep_len == max_ep_len
trainer.store_new_state([next_o], [r], [d], [None])
r_network.eval()
with torch.no_grad():
state_embedding = r_network.embed_observation(
torch.FloatTensor([o]).to(device)).cpu().numpy()[0]
aggregated, _, _ = similarity_to_memory(
state_embedding, episodic_memory, r_network)
curiosity_bonus = 0.03 * (0.5 - aggregated)
if BONUS:
print(f'{curiosity_bonus:.3f}')
if curiosity_bonus > 0 or len(episodic_memory) == 0:
idx = episodic_memory.store_new_state(state_embedding)
x = int(env.map_scale * info['pose']['x'])
y = int(env.map_scale * info['pose']['y'])
if idx == len(indices):
indices.append((x, y))
else:
indices[idx] = (x, y)
r_network.train()
next_o = next_o.transpose(2, 0, 1)
ep_ret += r + curiosity_bonus
ep_len += 1
# save and log
buf.store(o, a, r, v, logp)
logger.store(VVals=v)
k = cv2.waitKey(1)
if k == ord('s'):
RENDER = 1 - RENDER
elif k == ord('b'):
BONUS = 1 - BONUS
if RENDER:
env.info['map'] = cv2.flip(env.info['map'], 0)
for index in indices:
cv2.circle(env.info['map'], index, 3, (0, 0, 255), -1)
env.info['map'] = cv2.flip(env.info['map'], 0)
env.render()
# Update obs (critical!)
o = next_o
timeout = ep_len == max_ep_len
terminal = d or timeout
epoch_ended = t == local_steps_per_epoch - 1
if terminal or epoch_ended:
if epoch_ended and not (terminal):
print('Warning: trajectory cut off by epoch at %d steps.' %
ep_len,
flush=True)
# if trajectory didn't reach terminal state, bootstrap value target
if timeout or epoch_ended:
state = torch.as_tensor(o[np.newaxis, ...],
dtype=torch.float32)
_, v, _ = ac.step(state)
else:
v = 0
buf.finish_path(v)
if terminal:
# only save EpRet / EpLen if trajectory finished
logger.store(EpRet=ep_ret, EpLen=ep_len)
print(ep_ret, ep_len, len(episodic_memory))
ep_ret, ep_len = 0, 0
o, _ = env.reset()
o = o.astype(np.float32) / 255.
o = o.transpose(2, 0, 1)
episodic_memory.reset()
indices = []
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
# Perform PPO update!
if epoch > 4:
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts',
(epoch + 1) * steps_per_epoch)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
else:
buf.get()
def ppo(env_fn,
actor_critic=core.mlp_actor_critic,
ac_kwargs=dict(),
seed=0,
trials_per_epoch=2500,
steps_per_trial=100,
epochs=50,
gamma=0.99,
clip_ratio=0.2,
pi_lr=3e-4,
vf_lr=1e-3,
train_pi_iters=1000,
train_v_iters=80,
lam=0.97,
max_ep_len=1000,
target_kl=0.01,
logger_kwargs=dict(),
save_freq=10):
"""
Args:
env_fn : A function which creates a copy of the environment.
The environment must satisfy the OpenAI Gym API.
actor_critic: A function which takes in placeholder symbols
for state, ``x_ph``, and action, ``a_ph``, and returns the main
outputs from the agent's Tensorflow computation graph:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``pi`` (batch, act_dim) | Samples actions from policy given
| states.
``logp`` (batch,) | Gives log probability, according to
| the policy, of taking actions ``a_ph``
| in states ``x_ph``.
``logp_pi`` (batch,) | Gives log probability, according to
| the policy, of the action sampled by
| ``pi``.
``v`` (batch,) | Gives the value estimate for states
| in ``x_ph``. (Critical: make sure
| to flatten this!)
=========== ================ ======================================
ac_kwargs (dict): Any kwargs appropriate for the actor_critic
function you provided to PPO.
seed (int): Seed for random number generators.
steps_per_epoch (int): Number of steps of interaction (state-action pairs)
for the agent and the environment in each epoch.
epochs (int): Number of epochs of interaction (equivalent to
number of policy updates) to perform.
gamma (float): Discount factor. (Always between 0 and 1.)
clip_ratio (float): Hyperparameter for clipping in the policy objective.
Roughly: how far can the new policy go from the old policy while
still profiting (improving the objective function)? The new policy
can still go farther than the clip_ratio says, but it doesn't help
on the objective anymore. (Usually small, 0.1 to 0.3.)
pi_lr (float): Learning rate for policy optimizer.
vf_lr (float): Learning rate for value function optimizer.
train_pi_iters (int): Maximum number of gradient descent steps to take
on policy loss per epoch. (Early stopping may cause optimizer
to take fewer than this.)
train_v_iters (int): Number of gradient descent steps to take on
value function per epoch.
lam (float): Lambda for GAE-Lambda. (Always between 0 and 1,
close to 1.)
max_ep_len (int): Maximum length of trajectory / episode / rollout.
target_kl (float): Roughly what KL divergence we think is appropriate
between new and old policies after an update. This will get used
for early stopping. (Usually small, 0.01 or 0.05.)
logger_kwargs (dict): Keyword args for EpochLogger.
save_freq (int): How often (in terms of gap between epochs) to save
the current policy and value function.
"""
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
seed += 10000 * proc_id()
tf.set_random_seed(seed)
np.random.seed(seed)
env = env_fn()
obs_dim = env.observation_space.shape
act_dim = env.action_space.shape
# Share information about action space with policy architecture
ac_kwargs['action_space'] = env.action_space
# Inputs to computation graph
# x_ph, a_ph = core.placeholders_from_spaces(env.observation_space, env.action_space)
x_ph = tf.placeholder(dtype=tf.float32, shape=(None, None, 1), name='x_ph')
a_ph = tf.placeholder(dtype=tf.int32, shape=(None, None), name='a_ph')
# adv_ph, ret_ph, logp_old_ph, rew_ph = core.placeholders(None, None, None, 1)
adv_ph = tf.placeholder(dtype=tf.float32,
shape=(None, None),
name='adv_ph')
ret_ph = tf.placeholder(dtype=tf.float32,
shape=(None, None),
name='ret_ph')
logp_old_ph = tf.placeholder(dtype=tf.float32,
shape=(None, None),
name='logp_old_ph')
rew_ph = tf.placeholder(dtype=tf.float32,
shape=(None, None, 1),
name='rew_ph')
pi_state_ph = tf.placeholder(dtype=tf.float32,
shape=(None, NUM_GRU_UNITS),
name='pi_state_ph')
v_state_ph = tf.placeholder(dtype=tf.float32,
shape=(None, NUM_GRU_UNITS),
name='v_state_ph')
# Initialize rnn states for pi and v
# Main outputs from computation graph
pi, logp, logp_pi, v, new_pi_state, new_v_state = actor_critic(
x_ph,
a_ph,
rew_ph,
pi_state_ph,
v_state_ph,
NUM_GRU_UNITS,
action_space=env.action_space)
# Need all placeholders in *this* order later (to zip with data from buffer)
all_phs = [x_ph, a_ph, adv_ph, ret_ph, logp_old_ph, rew_ph]
# Every step, get: action, value, and logprob and reward
get_action_ops = [pi, v, logp_pi, new_pi_state, new_v_state]
# Experience buffer
steps_per_epoch = trials_per_epoch * steps_per_trial
local_steps_per_epoch = int(steps_per_epoch / num_procs())
buf = PPOBuffer(obs_dim, act_dim, local_steps_per_epoch, gamma, lam)
# Count variables
var_counts = tuple(core.count_vars(scope) for scope in ['pi', 'v'])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n' % var_counts)
# PPO objectives
ratio = tf.exp(logp - logp_old_ph) # pi(a|s) / pi_old(a|s)
min_adv = tf.where(adv_ph > 0, (1 + clip_ratio) * adv_ph,
(1 - clip_ratio) * adv_ph)
pi_loss = -tf.reduce_mean(tf.minimum(ratio * adv_ph, min_adv))
v_loss = tf.reduce_mean((ret_ph - v)**2)
# Info (useful to watch during learning)
approx_kl = tf.reduce_mean(
logp_old_ph -
logp) # a sample estimate for KL-divergence, easy to compute
approx_ent = tf.reduce_mean(
-logp) # a sample estimate for entropy, also easy to compute
clipped = tf.logical_or(ratio > (1 + clip_ratio), ratio < (1 - clip_ratio))
clipfrac = tf.reduce_mean(tf.cast(clipped, tf.float32))
# Optimizers
train_pi = MpiAdamOptimizer(
learning_rate=pi_lr).minimize(pi_loss - 0.01 * approx_ent)
train_v = MpiAdamOptimizer(learning_rate=vf_lr).minimize(v_loss)
sess = tf.Session()
sess.run(tf.global_variables_initializer())
# Sync params across processes
sess.run(sync_all_params())
# Setup model saving
logger.setup_tf_saver(sess, inputs={'x': x_ph}, outputs={'pi': pi, 'v': v})
# tf.reset_default_graph()
# restore_tf_graph(sess, '..//data//ppo//ppo_s0//simple_save')
def update():
inputs = {k: v for k, v in zip(all_phs, buf.get())}
inputs[pi_state_ph] = np.zeros((trials_per_epoch, NUM_GRU_UNITS))
inputs[v_state_ph] = np.zeros((trials_per_epoch, NUM_GRU_UNITS))
pi_l_old, v_l_old, ent = sess.run([pi_loss, v_loss, approx_ent],
feed_dict=inputs)
print(pi_l_old, v_l_old)
# Training
for i in range(train_pi_iters):
# print(f'pi:{i}')
_, kl = sess.run([train_pi, approx_kl], feed_dict=inputs)
# print(sess.run(pi_loss, feed_dict=inputs))
kl = mpi_avg(kl)
if kl > 1.5 * target_kl:
logger.log(
'Early stopping at step %d due to reaching max kl.' % i)
break
logger.store(StopIter=i)
for _ in range(train_v_iters):
# print(f'v:{_}')
sess.run(train_v, feed_dict=inputs)
# Log changes from update
import datetime
print(f'finish one batch training at {datetime.datetime.now()}')
pi_l_new, v_l_new, kl, cf = sess.run(
[pi_loss, v_loss, approx_kl, clipfrac], feed_dict=inputs)
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
Entropy=ent,
ClipFrac=cf,
DeltaLossPi=(pi_l_new - pi_l_old),
DeltaLossV=(v_l_new - v_l_old))
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
for trial in range(trials_per_epoch):
print(f'trial: {trial}')
old_a = np.array([0]).reshape(1, 1)
old_r = np.array([0]).reshape((1, 1, 1))
means = env.sample_tasks(1)[0]
action_dict = defaultdict(int)
for i in range(env.action_space.n):
action_dict[i] = 0
env.reset_task_simple(means)
task_avg = 0.0
pi_state_t = np.zeros((1, NUM_GRU_UNITS))
v_state_t = np.zeros((1, NUM_GRU_UNITS))
for step in range(steps_per_trial):
a, v_t, logp_t, pi_state_t, v_state_t = sess.run(
get_action_ops,
feed_dict={
x_ph: o.reshape(1, 1, -1),
a_ph: old_a,
rew_ph: old_r,
pi_state_ph: pi_state_t,
v_state_ph: v_state_t
})
# save and log
buf.store(o, a, r, v_t, logp_t)
logger.store(VVals=v_t)
try:
o, r, d, _ = env.step(a[0][0])
except:
print(a)
raise AssertionError
action_dict[a[0][0]] += 1
old_a = np.array(a).reshape(1, 1)
old_r = np.array([r]).reshape(1, 1, 1)
ep_ret += r
task_avg += r
ep_len += 1
terminal = d or (ep_len == max_ep_len)
if terminal or (step == local_steps_per_epoch - 1):
if not (terminal):
print(
'Warning: trajectory cut off by epoch at %d steps.'
% ep_len)
# if trajectory didn't reach terminal state, bootstrap value target
last_val = r if d else sess.run(
v, feed_dict={x_ph: o.reshape(1, -1)})
buf.finish_path(last_val)
if terminal:
# only save EpRet / EpLen if trajectory finished
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# logger.log_tabular('Epoch', epoch)
# logger.log_tabular('EpRet', with_min_and_max=True)
# logger.log_tabular('Means', means)
# logger.dump_tabular()
print(f'avg in trial {trial}: {task_avg / steps_per_trial}')
print(f'Means in trial {trial}: {means}')
print(action_dict)
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
# saved_path = saver.save(sess, f"/tmp/model_epoch{epoch}.ckpt")
# print(f'Model saved in {saved_path}')
# Perform PPO update!
update()
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts', (epoch + 1) * steps_per_epoch)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
def td3( env_fn, actor_critic=a2c, ac_kwargs=dict(), seed=0, steps_per_epoch=5000,
epochs=100, replay_size=int(1e6), gamma=.99, polyak=.995, pi_lr=1e-3, q_lr=1e-3,
batch_size=100, start_steps=10000, act_noise=.1, target_noise=.2, noise_clip=.5,
policy_delay=2, max_ep_len=1000, logger_kwargs=dict(), save_freq=1):
logger = EpochLogger( **logger_kwargs)
logger.save_config( locals())
tf.set_random_seed(seed)
np.random.seed( seed)
env, test_env = env_fn(), env_fn()
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
# Action limit for clamping
act_limit = env.action_space.high[0]
# Share action sapce info with A2C
ac_kwargs['action_space'] = env.action_space
x_ph, a_ph, x2_ph, r_ph, d_ph = \
tf.placeholder( name='x_ph', shape=(None, obs_dim), dtype=tf.float32), \
tf.placeholder( name='a_ph', shape=(None, act_dim), dtype=tf.float32), \
tf.placeholder( name='x2_ph', shape=(None, obs_dim), dtype=tf.float32),\
tf.placeholder( name='r_ph', shape=(None), dtype=tf.float32), \
tf.placeholder( name='d_ph', shape=(None), dtype=tf.float32)
# Actor policy and value
with tf.variable_scope('main'):
pi, q1, q2, q1_pi = actor_critic( x_ph, a_ph, **ac_kwargs)
# Tghis seems a bit memory inneficient: what happens to the q values created
# along with the target policy ? the poluicy created along the q targets ?
# Not referenced, but still declared right, a the cost of GPU memory
# Target policy
with tf.variable_scope( 'target'):
pi_targ, _, _, _ = actor_critic(x2_ph, a_ph, **ac_kwargs)
# Target Q networks
with tf.variable_scope( 'target', reuse=True):
epsilon = tf.random_normal( tf.shape( pi_targ), stddev=target_noise)
epsilon = tf.clip_by_value( epsilon, -noise_clip, noise_clip)
a2 = pi_targ + epsilon
a2 = tf.clip_by_value( a2, -act_limit, act_limit)
# Target Q-Values using actions from target policy
_, q1_targ, q2_targ, _ = actor_critic(x2_ph, a2, **ac_kwargs)
replaybuffer = ReplayBuffer( obs_dim, act_dim, size=replay_size)
# helpers for var count
def get_vars(scope=''):
return [x for x in tf.trainable_variables() if scope in x.name]
def count_vars(scope=''):
v = get_vars(scope)
return sum([np.prod(var.shape.as_list()) for var in v])
# Count variables
var_counts = tuple( count_vars( scope) for scope in ['main/pi',
'main/q1', 'main/q2', 'main'])
print('\nNumber of parameters: \t pi: %d, \t q1: %d, \t q2: %d, \t total: %d\n' % var_counts)
# CLiped Double Q-Learning with Bellman backup
min_q_targ = tf.minimum( q1_targ, q2_targ)
backup = tf.stop_gradient( r_ph + gamma * (1 -d_ph) * min_q_targ)
# TD3 Losses
pi_loss = - tf.reduce_mean( q1_pi)
q1_loss = tf.reduce_mean( (q1 - backup)**2)
q2_loss = tf.reduce_mean( (q2 - backup)**2)
q_loss = q1_loss + q2_loss
# Trainin ops
pi_train = tf.train.AdamOptimizer(pi_lr).minimize( pi_loss)
q_train = tf.train.AdamOptimizer(q_lr).minimize( q_loss)
# Polyak wise target update
target_update = tf.group( [ tf.assign( v_targ, polyak * v_targ + (1-polyak)
* v_main) for v_main, v_targ in zip( get_vars('main'), get_vars('target'))])
target_init = tf.group( [ tf.assign( v_targ, v_main) for v_targ, v_main in
zip( get_vars('target'), get_vars('main'))])
sess = tf.Session()
sess.run( tf.global_variables_initializer())
sess.run( target_init)
# Setup model saving
logger.setup_tf_saver(sess, inputs={'x': x_ph, 'a': a_ph}, outputs={'pi': pi, 'q1': q1, 'q2': q2})
def get_action( o, noise_scale):
a = sess.run( pi, feed_dict={ x_ph: o.reshape(1,-1)})
a += noise_scale * np.random.randn( act_dim)
return np.clip( a, -act_limit, act_limit)
def test_agent( n=10):
for j in range( n):
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0 ,0
while not ( d or (ep_len == max_ep_len)):
o, r, d, _ = test_env.step( get_action( o, 0))
ep_ret += r
ep_len += 1
logger.store( TestEpRet=ep_ret, TestEpLen=ep_len)
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0 , 0
total_steps = steps_per_epoch * epochs
# Main loop
for t in range( total_steps):
if t > start_steps:
a = get_action( o, act_noise)
else:
a = env.action_space.sample()
o2, r, d, _ = env.step( a)
ep_ret += r
ep_len += 1
d = False or ( ep_len == max_ep_len)
o2 = np.squeeze( o2)
# print( "O2: ", o2)
replaybuffer.store( o, a, r, o2, d)
o = o2
if d or ( ep_len == max_ep_len):
for j in range( ep_len):
batch = replaybuffer.sample_batch( batch_size)
feed_dict = {x_ph: batch['obs1'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done']
}
q_step_ops = [q_loss, q1, q2, q_train]
outs = sess.run( q_step_ops, feed_dict)
logger.store(LossQ=outs[0], Q1Vals=outs[1], Q2Vals=outs[2])
if j % policy_delay == 0:
outs = sess.run( [pi_loss, pi_train, target_update], feed_dict)
logger.store( LossPi=outs[0])
logger.store( EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
if t > 0 and t % steps_per_epoch == 0:
epoch = t // steps_per_epoch
# Saving the model
if (epoch % save_freq == 0) or ( epoch == epochs - 1):
logger.save_state({'env': env}, None)
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('Q1Vals', with_min_and_max=True)
logger.log_tabular('Q2Vals', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('Time', time.time()-start_time)
logger.dump_tabular()
def trpo(env_fn,
actor_critic,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=4000,
epochs=50,
gamma=.99,
delta=.01,
vf_lr=1e-3,
train_v_iters=80,
damping_coeff=.1,
cg_iters=10,
backtrack_iters=10,
backtrack_coeff=.8,
lam=.97,
max_ep_len=1000,
logger_kwargs=dict(),
save_freq=10,
algo="trpo"):
# LOgger tools
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
# Seed inits
seed += 10000 * proc_id()
tf.set_random_seed(seed)
np.random.seed(seed)
# Environment recreation
env = env_fn()
# Getting obs dims
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
ac_kwargs['action_space'] = env.action_space
# Placeholders
x_ph, a_ph = tf.placeholder( name="x_ph", shape=[None, obs_dim], dtype=tf.float32), \
tf.placeholder( name="a_ph", shape=[None, act_dim], dtype=tf.float32)
adv_ph, ret_ph, logp_old_ph = tf.placeholder( name="adv_ph", shape=[None], dtype=tf.float32), \
tf.placeholder( name="ret_ph", shape=[None], dtype=tf.float32), \
tf.placeholder( name="logp_old_ph", shape=[None], dtype=tf.float32)
pi, logp, logp_pi, info, info_phs, d_kl, v = actor_critic(
x_ph, a_ph, **ac_kwargs)
def keys_as_sorted_list(dict):
return sorted(list(dict.keys()))
def values_as_sorted_list(dict):
return [dict[k] for k in keys_as_sorted_list(dict)]
all_phs = [x_ph, a_ph, adv_ph, ret_ph, logp_old_ph
] + values_as_sorted_list(info_phs)
get_action_ops = [pi, v, logp_pi] + values_as_sorted_list(info)
# Experience buffer init
local_steps_per_epoch = int(steps_per_epoch / num_procs())
info_shapes = {k: v.shape.as_list()[1:] for k, v in info_phs.items()}
buf = GAEBuffer(obs_dim, act_dim, local_steps_per_epoch, info_shapes,
gamma, lam)
# Count variables
def get_vars(scope=''):
return [x for x in tf.trainable_variables() if scope in x.name]
def count_vars(scope=''):
v = get_vars(scope)
return sum([np.prod(var.shape.as_list()) for var in v])
var_counts = tuple(count_vars(scope) for scope in ["pi", "v"])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n' % var_counts)
# TRPO Losses
ratio = tf.exp(logp - logp_old_ph)
pi_loss = -tf.reduce_mean(ratio * adv_ph)
v_loss = tf.reduce_mean((ret_ph - v)**2)
# Optimizer for value function
train_vf = MpiAdamOptimizer(learning_rate=vf_lr).minimize(v_loss)
# CG solver requirements
pi_params = get_vars("pi")
# Some helpers
def flat_concat(xs):
return tf.concat([tf.reshape(x, (-1, )) for x in xs], axis=0)
def flat_grad(f, params):
return flat_concat(tf.gradients(xs=params, ys=f))
def hessian_vector_product(f, params):
g = flat_grad(f, params)
x = tf.placeholder(tf.float32, shape=g.shape)
return x, flat_grad(tf.reduce_sum(g * x), params)
def assign_params_from_flat(x, params):
flat_size = lambda p: int(np.prod(p.shape.as_list())
) # the 'int' is important for scalars
splits = tf.split(x, [flat_size(p) for p in params])
new_params = [
tf.reshape(p_new, p.shape) for p, p_new in zip(params, splits)
]
return tf.group(
[tf.assign(p, p_new) for p, p_new in zip(params, new_params)])
gradient = flat_grad(pi_loss, pi_params)
v_ph, hvp = hessian_vector_product(d_kl, pi_params)
if damping_coeff > 0:
hvp += damping_coeff * v_ph
# Symbols for getting and setting params
get_pi_params = flat_concat(pi_params)
set_pi_params = assign_params_from_flat(v_ph, pi_params)
sess = tf.Session()
sess.run(tf.global_variables_initializer())
# Sync params across processes
sess.run(sync_all_params())
# Setup model saving
logger.setup_tf_saver(sess, inputs={'x': x_ph}, outputs={'pi': pi, 'v': v})
def cg(Ax, b):
x = np.zeros_like(b)
r = b.copy()
p = r.copy()
r_dot_old = np.dot(r, r)
for _ in range(cg_iters):
z = Ax(p)
alpha = r_dot_old / (np.dot(p, z) + EPS)
x += alpha * p
r -= alpha * z
r_dot_new = np.dot(r, r)
p = r + (r_dot_new / r_dot_old) * p
r_dot_old = r_dot_new
return x
def update():
# Prepare hessian func, gradient eval
# Always so elegant haha
inputs = {k: v for k, v in zip(all_phs, buf.get())}
def mpi_avg(x):
"""Average a scalar or vector over MPI processes."""
return mpi_sum(x) / num_procs()
Hx = lambda x: mpi_avg(sess.run(hvp, feed_dict={**inputs, v_ph: x}))
g, pi_l_old, v_l_old = sess.run([gradient, pi_loss, v_loss],
feed_dict=inputs)
g, pi_l_old = mpi_avg(g), mpi_avg(pi_l_old)
# Core calculations for TRPO or NPG
x = cg(Hx, g)
alpha = np.sqrt(2 * delta / (np.dot(x, Hx(x)) + EPS)) # OK
old_params = sess.run(get_pi_params)
def set_and_eval(step):
sess.run(set_pi_params,
feed_dict={v_ph: old_params - alpha * x * step})
return mpi_avg(sess.run([d_kl, pi_loss], feed_dict=inputs))
if algo == 'npg':
# npg has no backtracking or hard kl constraint enforcement
kl, pi_l_new = set_and_eval(step=1.)
elif algo == "trpo":
for j in range(backtrack_iters):
kl, pi_l_new = set_and_eval(step=backtrack_coeff**j)
if kl <= delta and pi_l_new <= pi_l_old:
logger.log(
'Accepting new params at step %d of line search.' % j)
logger.store(BacktrackIters=j)
break
if j == backtrack_iters - 1:
logger.log('Line search failed! Keeping old params.')
logger.store(BacktrackIters=j)
kl, pi_l_new = set_and_eval(step=0.)
# Value function updates
for _ in range(train_v_iters):
sess.run(train_vf, feed_dict=inputs)
v_l_new = sess.run(v_loss, feed_dict=inputs)
# Log changes from update
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
DeltaLossPi=(pi_l_new - pi_l_old),
DeltaLossV=(v_l_new - v_l_old))
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
for t in range(local_steps_per_epoch):
agent_outs = sess.run(get_action_ops,
feed_dict={x_ph: o.reshape(1, -1)})
a, v_t, logp_t, info_t = agent_outs[0][0], agent_outs[
1], agent_outs[2], agent_outs[3:]
# Save and log
buf.store(o, a, r, v_t, logp_t, info_t)
logger.store(VVals=v_t)
o, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
terminal = d or (ep_len == max_ep_len)
if terminal or (t == local_steps_per_epoch - 1):
if not terminal:
print('Warning: trajectory cut off by epoch at %d steps.' %
ep_len)
last_val = r if d else sess.run(
v, feed_dict={x_ph: o.reshape(1, -1)})
buf.finish_path(last_val)
if terminal:
# only save EpRet / EpLen if trajectory finished
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
# Perform TRPO or NPG update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts', (epoch + 1) * steps_per_epoch)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('KL', average_only=True)
if algo == 'trpo':
logger.log_tabular('BacktrackIters', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
def iac(env_config, ac_type, ac_kwargs, rb_type, rb_kwargs, gamma, lr, polyak,
batch_size, epochs, start_steps, steps_per_epoch, inc_ep, max_ep_len,
test_max_ep_len, number_of_tests_per_epoch, q_pi_sample_size, z_dim,
z_type, act_noise, test_without_state, logger_kwargs, seed):
logger = EpochLogger(**logger_kwargs)
configs = locals().copy()
configs.pop("logger")
logger.save_config(configs)
tf.set_random_seed(seed)
np.random.seed(seed)
env, test_env = make_env(env_config), make_env(env_config)
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
act_high = env.action_space.high
# Inputs to computation graph
x_ph, a_ph, z_ph, x2_ph, r_ph, d_ph = core.placeholders(
obs_dim, act_dim, z_dim, obs_dim, None, None)
actor_critic = core.get_iac_actor_critic(ac_type)
# Main outputs from computation graph
with tf.variable_scope('main'):
pi, q1, q2, q1_pi, q2_pi, v = actor_critic(x_ph, a_ph, z_ph,
**ac_kwargs)
# Target networks
with tf.variable_scope('target'):
_, _, _, _, _, v_targ = actor_critic(x2_ph, a_ph, z_ph, **ac_kwargs)
# Experience buffer
RB = get_replay_buffer(rb_type)
replay_buffer = RB(obs_dim, act_dim, **rb_kwargs)
# Count variables
var_counts = tuple(
core.count_vars(scope)
for scope in ['main/pi', 'main/q', 'main/v', 'main'])
print(
'\nNumber of parameters: \t pi: %d, \t q: %d, \t v: %d, \t total: %d\n'
% var_counts)
# Bellman backup for Q and V function
q_backup = tf.stop_gradient(r_ph + gamma * (1 - d_ph) * v_targ)
min_q_pi = tf.minimum(q1_pi, q2_pi)
v_backup = tf.stop_gradient(min_q_pi)
# TD3 losses
pi_loss = -tf.reduce_mean(q1_pi)
q1_loss = 0.5 * tf.reduce_mean((q1 - q_backup)**2)
q2_loss = 0.5 * tf.reduce_mean((q2 - q_backup)**2)
v_loss = 0.5 * tf.reduce_mean((v - v_backup)**2)
value_loss = q1_loss + q2_loss + v_loss
# Separate train ops for pi, q
policy_optimizer = tf.train.AdamOptimizer(learning_rate=lr)
value_optimizer = tf.train.AdamOptimizer(learning_rate=lr)
train_policy_op = policy_optimizer.minimize(pi_loss,
var_list=get_vars('main/pi'))
if ac_kwargs["pi_separate"]:
train_policy_emb_op = policy_optimizer.minimize(
pi_loss, var_list=get_vars('main/pi/emb'))
train_policy_d_op = policy_optimizer.minimize(
pi_loss, var_list=get_vars('main/pi/d'))
train_value_op = value_optimizer.minimize(value_loss,
var_list=get_vars('main/q') +
get_vars('main/v'))
# Polyak averaging for target variables
target_update = tf.group([
tf.assign(v_targ, polyak * v_targ + (1 - polyak) * v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
# Initializing targets to match main variables
target_init = tf.group([
tf.assign(v_targ, v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
sess = tf.Session()
sess.run(tf.global_variables_initializer())
sess.run(target_init)
def sample_z(size):
if z_type == "uniform":
return np.random.random_sample(size=size)
elif z_type == "gaussian":
return np.random.normal(size=size)
else:
raise Exception("z_type error")
def get_action(o, noise_scale):
pi_a = sess.run(pi,
feed_dict={
x_ph: o.reshape(1, -1),
z_ph: sample_z((1, z_dim))
})[0]
pi_a += noise_scale * np.random.randn(act_dim)
pi_a = np.clip(pi_a, 0, 1)
real_a = pi_a * act_high
return pi_a, real_a
def test_agent(n=10):
test_actions = []
for j in range(n):
test_actions_ep = []
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0, 0
while not (d or (ep_len == test_max_ep_len)):
# Take deterministic actions at test time (noise_scale=0)
if test_without_state:
_, real_a = get_action(np.zeros(o.shape), 0)
else:
_, real_a = get_action(o, 0)
test_actions_ep.append(real_a)
o, r, d, _ = test_env.step(real_a)
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
test_actions.append(test_actions_ep)
return test_actions
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
total_steps = steps_per_epoch * epochs
rewards = []
rets = []
test_rets = []
max_ret = None
# Main loop: collect experience in env and update/log each epoch
for t in range(total_steps):
"""
Until start_steps have elapsed, randomly sample actions
from a uniform distribution for better exploration. Afterwards,
use the learned policy (with some noise, via act_noise).
"""
if t > start_steps:
pi_a, real_a = get_action(o, act_noise)
else:
pi_a, real_a = env.action_space.sample()
# Step the env
o2, r, d, _ = env.step(real_a)
ep_ret += r
ep_len += 1
# Ignore the "done" signal if it comes from hitting the time
# horizon (that is, when it's an artificial terminal signal
# that isn't based on the agent's state)
d = False if ep_len == max_ep_len else d
# Store experience to replay buffer
replay_buffer.store(o, pi_a, r, o2, d)
# Super critical, easy to overlook step: make sure to update
# most recent observation!
o = o2
if d or (ep_len == max_ep_len):
for _ in range(ep_len):
batch = replay_buffer.sample_batch(batch_size)
feed_dict = {
x_ph: batch['obs1'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done']
}
feed_dict[z_ph] = sample_z((batch_size, z_dim))
# Policy Learning update
for key in feed_dict:
feed_dict[key] = np.repeat(feed_dict[key],
q_pi_sample_size,
axis=0)
feed_dict[z_ph] = sample_z(
(batch_size * q_pi_sample_size, z_dim))
if ac_kwargs["pi_separate"]:
if len(rewards) % 2 == 0:
outs = sess.run([pi_loss, train_policy_emb_op],
feed_dict)
else:
outs = sess.run([pi_loss, train_policy_d_op],
feed_dict)
else:
outs = sess.run([pi_loss, train_policy_op], feed_dict)
logger.store(LossPi=outs[0])
# Q-learning update
outs = sess.run([q1_loss, v_loss, q1, v, train_value_op],
feed_dict)
logger.store(LossQ=outs[0],
LossV=outs[1],
ValueQ=outs[2],
ValueV=outs[3])
logger.store(EpRet=ep_ret, EpLen=ep_len)
rewards.append(ep_ret)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# End of epoch wrap-up
if (t + 1) % steps_per_epoch == 0:
epoch = (t + 1) // steps_per_epoch
# Test the performance of the deterministic version of the agent.
test_actions = test_agent(number_of_tests_per_epoch)
# Log info about epoch
logger.log_tabular('Epoch', epoch)
ret = logger.log_tabular('EpRet', average_only=True)[0]
test_ret = logger.log_tabular('TestEpRet', average_only=True)[0]
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('ValueQ', average_only=True)
logger.log_tabular('ValueV', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
rets.append(ret)
test_rets.append(test_ret)
if max_ret is None or test_ret > max_ret:
max_ret = test_ret
best_test_actions = test_actions
max_ep_len += inc_ep
sess.run(target_update, feed_dict)
logger.save_state(
{
"rewards": rewards,
"best_test_actions": best_test_actions,
"rets": rets,
"test_rets": test_rets,
"max_ret": max_ret
}, None)
util.plot_actions(best_test_actions, act_high,
logger.output_dir + '/best_test_actions.png')
logger.log("max ret: %f" % max_ret)
def ddpg(env_fn,
actor_critic=a2c,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=5000,
epochs=100,
replay_size=int(1e6),
gamma=.99,
polyak=.995,
pi_lr=1e-3,
q_lr=1e-3,
batch_size=100,
start_steps=10000,
act_noise=.1,
max_ep_len=1000,
logger_kwargs=dict(),
save_freq=1):
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
tf.set_random_seed(seed)
np.random.seed(seed)
env, test_env = env_fn(), env_fn()
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
act_limit = env.action_space.high[0]
ac_kwargs['action_space'] = env.action_space
x_ph, a_ph, x2_ph, r_ph, d_ph = \
tf.placeholder( name='x_ph', shape=[None, obs_dim], dtype=tf.float32), \
tf.placeholder( name='a_ph', shape=[None, act_dim], dtype=tf.float32), \
tf.placeholder( name='x2_ph', shape=[None, obs_dim], dtype=tf.float32), \
tf.placeholder( name='r_ph', shape=[None], dtype=tf.float32), \
tf.placeholder( name='d_ph', shape=[None], dtype=tf.float32)
# Main networks
with tf.variable_scope('main'):
pi, q, q_pi = actor_critic(x_ph, a_ph, **ac_kwargs)
# Target networks
with tf.variable_scope('target'):
pi_targ, _, q_pi_targ = actor_critic(x2_ph, a_ph, **ac_kwargs)
replaybuffer = ReplayBuffer(obs_dim, act_dim, replay_size)
# helpers for var count
def get_vars(scope=''):
return [x for x in tf.trainable_variables() if scope in x.name]
def count_vars(scope=''):
v = get_vars(scope)
return sum([np.prod(var.shape.as_list()) for var in v])
var_counts = tuple(
count_vars(scope) for scope in ['main/pi', 'main/q', 'main'])
print('\nNumber of parameters: \t pi: %d, \t q: %d, \t total: %d\n' %
var_counts)
# Bellman backup for Q function
backup = tf.stop_gradient(r_ph + gamma * (1 - d_ph) * q_pi_targ)
# Losses
pi_loss = -tf.reduce_mean(q_pi)
q_loss = tf.reduce_mean((q - backup)**2)
# Optimizer and train ops
train_pi_op = tf.train.AdamOptimizer(pi_lr).minimize(
pi_loss, var_list=get_vars('main/pi'))
train_q_op = tf.train.AdamOptimizer(q_loss).minimize(
q_loss, var_list=get_vars('main/q'))
# Update target networks
target_update = tf.group([
tf.assign(v_targ, polyak * v_targ + (1 - polyak) * v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
# Init targets
target_init = tf.group([
tf.assign(v_targ, v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
sess = tf.Session()
sess.run(tf.global_variables_initializer())
sess.run(target_init)
# Setup model saving
logger.setup_tf_saver(sess,
inputs={
'x': x_ph,
'a': a_ph
},
outputs={
'pi': pi,
'q': q
})
def get_actions(o, noise_scale):
a = sess.run(pi, feed_dict={x_ph: o.reshape(1, -1)})[0]
a += noise_scale * np.random.randn(act_dim)
return np.clip(a, -act_limit, act_limit)
def test_agent(n=10):
for j in range(n):
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0, 0
while not (d or (ep_len == max_ep_len)):
# Take deterministic actions at test time (noise_scale=0)
o, r, d, _ = test_env.step(get_actions(o, 0))
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
total_steps = steps_per_epoch * epochs
# Main loop:
for t in range(total_steps):
if t > start_steps:
a = get_actions(o, act_noise)
else:
a = env.action_space.sample()
o2, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
d = False if ep_len == max_ep_len else d
# Storing experience
replaybuffer.store(o, a, r, o2, d)
o = o2
if d or (ep_len == max_ep_len):
for _ in range(ep_len):
batch = replaybuffer.sample_batch(batch_size)
feed_dict = {
x_ph: batch['obs1'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done']
}
# Q-learning update
outs = sess.run([q_loss, q, train_q_op], feed_dict)
logger.store(LossQ=outs[0], QVals=outs[1])
# Policy update
outs = sess.run([pi_loss, train_pi_op, target_update],
feed_dict)
logger.store(LossPi=outs[0])
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
if t > 0 and t % steps_per_epoch == 0:
epoch = t // steps_per_epoch
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('QVals', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
def ppo(env_fn,
actor_critic=core.mlp_actor_critic,
ac_kwargs=dict(),
seed=0,
batch_size=250000,
n=100,
epochs=100,
gamma=0.99,
clip_ratio=0.2,
pi_lr=3e-4,
vf_lr=1e-3,
train_pi_iters=1000,
train_v_iters=80,
lam=0.97,
max_ep_len=1000,
target_kl=0.01,
logger_kwargs=dict(),
save_freq=10):
"""
Args:
env_fn : A function which creates a copy of the environment.
The environment must satisfy the OpenAI Gym API.
actor_critic: A function which takes in placeholder symbols
for state, ``x_ph``, and action, ``a_ph``, and returns the main
outputs from the agent's Tensorflow computation graph:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``pi`` (batch, act_dim) | Samples actions from policy given
| states.
``logp`` (batch,) | Gives log probability, according to
| the policy, of taking actions ``a_ph``
| in states ``x_ph``.
``logp_pi`` (batch,) | Gives log probability, according to
| the policy, of the action sampled by
| ``pi``.
``v`` (batch,) | Gives the value estimate for states
| in ``x_ph``. (Critical: make sure
| to flatten this!)
=========== ================ ======================================
ac_kwargs (dict): Any kwargs appropriate for the actor_critic
function you provided to PPO.
seed (int): Seed for random number generators.
steps_per_epoch (int): Number of steps of interaction (state-action pairs)
for the agent and the environment in each epoch.
epochs (int): Number of epochs of interaction (equivalent to
number of policy updates) to perform.
gamma (float): Discount factor. (Always between 0 and 1.)
clip_ratio (float): Hyperparameter for clipping in the policy objective.
Roughly: how far can the new policy go from the old policy while
still profiting (improving the objective function)? The new policy
can still go farther than the clip_ratio says, but it doesn't help
on the objective anymore. (Usually small, 0.1 to 0.3.)
pi_lr (float): Learning rate for policy optimizer.
vf_lr (float): Learning rate for value function optimizer.
train_pi_iters (int): Maximum number of gradient descent steps to take
on policy loss per epoch. (Early stopping may cause optimizer
to take fewer than this.)
train_v_iters (int): Number of gradient descent steps to take on
value function per epoch.
lam (float): Lambda for GAE-Lambda. (Always between 0 and 1,
close to 1.)
max_ep_len (int): Maximum length of trajectory / episode / rollout.
target_kl (float): Roughly what KL divergence we think is appropriate
between new and old policies after an update. This will get used
for early stopping. (Usually small, 0.01 or 0.05.)
logger_kwargs (dict): Keyword args for EpochLogger.
save_freq (int): How often (in terms of gap between epochs) to save
the current policy and value function.
"""
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
tf.set_random_seed(seed)
np.random.seed(seed)
env = env_fn()
obs_dim = env.observation_space.shape
act_dim = env.action_space.shape
sequence_length = n * max_ep_len
trials = batch_size // sequence_length
# Share information about action space with policy architecture
ac_kwargs['action_space'] = env.action_space
# Inputs to computation graph
# x_ph, a_ph = core.placeholders_from_spaces(env.observation_space, env.action_space)
# rew_ph, adv_ph, ret_ph, logp_old_ph = core.placeholders(1, None, None, None)
x_ph = tf.placeholder(dtype=tf.int32,
shape=(None, sequence_length),
name='x_ph')
t_ph = tf.placeholder(dtype=tf.int32,
shape=(None, sequence_length),
name='t_ph')
a_ph = tf.placeholder(dtype=tf.int32,
shape=(None, sequence_length),
name='a_ph')
r_ph = tf.placeholder(dtype=tf.float32,
shape=(None, sequence_length),
name='r_ph')
# input_ph = tf.placeholder(dtype=tf.float32, shape=(None, None, n, None), name='rew_ph')
adv_ph = tf.placeholder(dtype=tf.float32, shape=(None), name='adv_ph')
ret_ph = tf.placeholder(dtype=tf.float32, shape=(None), name='ret_ph')
logp_old_ph = tf.placeholder(dtype=tf.float32,
shape=(None),
name='logp_old_ph')
# Main outputs from computation graph
pi, logp, logp_pi, v = actor_critic(x_ph, t_ph, a_ph, r_ph,
sequence_length, env.action_space.n,
env.observation_space.shape[0])
# Need all placeholders in *this* order later (to zip with data from buffer)
all_phs = [x_ph, t_ph, a_ph, r_ph, adv_ph, ret_ph, logp_old_ph]
# for ph in all_phs:
# print(ph.shape)
# Every step, get: action, value, and logprob
get_action_ops = [pi, v, logp_pi]
# Experience buffer
buf = PPOBuffer(obs_dim, act_dim, batch_size, gamma, lam)
# Count variables
var_counts = tuple(core.count_vars(scope) for scope in ['pi', 'v'])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n' % var_counts)
# PPO objectives
ratio = tf.exp(logp - logp_old_ph) # pi(a|s) / pi_old(a|s)
min_adv = tf.where(adv_ph > 0, (1 + clip_ratio) * adv_ph,
(1 - clip_ratio) * adv_ph)
pi_loss = -tf.reduce_mean(tf.minimum(ratio * adv_ph, min_adv))
v_loss = tf.reduce_mean((ret_ph - v)**2)
# Info (useful to watch during learning)
approx_kl = tf.reduce_mean(
logp_old_ph -
logp) # a sample estimate for KL-divergence, easy to compute
approx_ent = tf.reduce_mean(
-logp) # a sample estimate for entropy, also easy to compute
clipped = tf.logical_or(ratio > (1 + clip_ratio), ratio < (1 - clip_ratio))
clipfrac = tf.reduce_mean(tf.cast(clipped, tf.float32))
# Optimizers
train_pi = MpiAdamOptimizer(learning_rate=pi_lr).minimize(pi_loss)
train_v = MpiAdamOptimizer(learning_rate=vf_lr).minimize(v_loss)
sess = tf.Session()
sess.run(tf.global_variables_initializer())
# Sync params across processes
sess.run(sync_all_params())
# Setup model saving
model_inputs = {'x': x_ph, 't': t_ph, 'a': a_ph, 'r': r_ph}
model_outputs = {'pi': pi}
logger.setup_tf_saver(sess, inputs=model_inputs, outputs=model_outputs)
def update():
inputs = {k: v for k, v in zip(all_phs, buf.get())}
# inputs[a_ph] = np.tril(np.transpose(np.repeat(inputs[a_ph], n).reshape(trials, n, n), [0, 2, 1]))
# inputs[rew_ph] = np.tril(np.transpose(np.repeat(inputs[rew_ph], n).reshape(trials, n, n), [0, 2, 1]))
# print(inputs[x_ph])
# print(inputs[t_ph])
# print(inputs[a_ph])
# print(inputs[r_ph])
inputs[x_ph] = inputs[x_ph].reshape(trials, sequence_length)
inputs[t_ph] = inputs[t_ph].reshape(trials, sequence_length)
inputs[a_ph] = inputs[a_ph].reshape(trials, sequence_length)
inputs[r_ph] = inputs[r_ph].reshape(trials, sequence_length)
# print('x:', inputs[x_ph])
# print('t:', inputs[t_ph])
# print('a:', inputs[a_ph])
# print('r:', inputs[r_ph])
# print('ret:', inputs[ret_ph])
# print('adv:', inputs[adv_ph])
# print('logp_old:', inputs[logp_old_ph])
pi_l_old, v_l_old, ent = sess.run([pi_loss, v_loss, approx_ent],
feed_dict=inputs)
# Training
for i in range(train_pi_iters):
_, kl = sess.run([train_pi, approx_kl], feed_dict=inputs)
# kl = mpi_avg(kl)
# if kl > 1.5 * target_kl:
# logger.log('Early stopping at step %d due to reaching max kl.'%i)
# break
logger.store(StopIter=i)
for _ in range(train_v_iters):
sess.run(train_v, feed_dict=inputs)
# Log changes from update
pi_l_new, v_l_new, kl, cf = sess.run(
[pi_loss, v_loss, approx_kl, clipfrac], feed_dict=inputs)
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
Entropy=ent,
ClipFrac=cf,
DeltaLossPi=(pi_l_new - pi_l_old),
DeltaLossV=(v_l_new - v_l_old))
start_time = time.time()
save_itr = 0
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
for trail in range(trials):
print('trial:', trail)
# last_a = np.zeros(n).reshape(1, n)
# last_r = np.zeros(n).reshape(1, n)
o_deque = deque(sequence_length * [0], sequence_length)
t_deque = deque(sequence_length * [0], sequence_length)
last_a = deque(sequence_length * [0], sequence_length)
last_r = deque(sequence_length * [0], sequence_length)
means = env.sample_tasks(1)[0]
# print('task means:', means)
action_dict = defaultdict(int)
total_reward = 0
env.reset_task(means)
o, r, d, ep_ret, ep_len = env.reset(), np.zeros(1), False, 0, 0
for episode in range(sequence_length):
# print('episode:', episode)
# print('o:', o_deque)
# print('d:', t_deque)
# print('a:', last_a)
# print('r:', last_r)
a, v_t, logp_t = sess.run(
get_action_ops,
feed_dict={
x_ph: np.array(o_deque).reshape(1, sequence_length),
t_ph: np.array(t_deque).reshape(1, sequence_length),
a_ph: np.array(last_a).reshape(1, sequence_length),
r_ph: np.array(last_r).reshape(1, sequence_length)
})
# print("a shape:", a.shape)
# print("v_t shape:", v_t.shape)
# print("logp_t shape:", logp_t.shape)
# choosen_a = a[episode, 0]
# choosen_v_t = v_t[0, episode]
# choosen_logp_t = logp_t[episode]
# print('a:', a)
choosen_a = a[-1]
choosen_v_t = v_t[-1]
choosen_logp_t = logp_t[-1]
action_dict[choosen_a] += 1
o, r, d, _ = env.step(choosen_a)
ep_ret += r
ep_len += 1
t = ep_len == max_ep_len
total_reward += r
o_deque.append(o)
t_deque.append(int(d))
last_a.append(choosen_a)
last_r.append(r)
# save and log
buf.store(o, int(t), choosen_a, r, choosen_v_t, choosen_logp_t)
logger.store(VVals=v_t)
terminal = d or t
if terminal or (episode == sequence_length - 1):
if not (terminal):
print(
'Warning: trajectory cut off by epoch at %d steps.'
% ep_len)
# if trajectory didn't reach terminal state, bootstrap value target
if d:
last_val = r
else:
last_val = sess.run(
v,
feed_dict={
x_ph:
np.array(o_deque).reshape(1, sequence_length),
t_ph:
np.array(t_deque).reshape(1, sequence_length),
a_ph:
np.array(last_a).reshape(1, sequence_length),
r_ph:
np.array(last_r).reshape(1, sequence_length)
})
last_val = last_val[-1]
buf.finish_path(last_val)
if terminal:
# only save EpRet / EpLen if trajectory finished
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
o_deque[-1] = 0
t_deque[-1] = 0
last_a[-1] = 0
last_r[-1] = 0
print(action_dict)
print('average reward:', total_reward / sequence_length)
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, save_itr)
save_itr += 1
# Perform PPO update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts', (epoch + 1) * batch_size)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
class td3_agent:
def __init__(self, args, env, env_params):
self.args = args
# path to save the model
self.exp_name = '_'.join(
(self.args.env_name, self.args.alg, str(self.args.seed),
datetime.now().isoformat()))
self.data_path = os.path.join(
self.args.save_dir, '_'.join((self.args.env_name, self.args.alg)),
self.exp_name)
self.logger = EpochLogger(output_dir=self.data_path,
exp_name=self.exp_name)
self.logger.save_config(args)
self.env = env
self.env_params = env_params
# create the network
self.actor_network = actor(env_params)
self.critic_network1 = critic(env_params)
self.critic_network2 = critic(env_params)
# sync the networks across the cpus
sync_networks(self.actor_network)
sync_networks(self.critic_network1)
sync_networks(self.critic_network2)
# build up the target network
self.actor_target_network = actor(env_params)
self.critic_target_network1 = critic(env_params)
self.critic_target_network2 = critic(env_params)
# load the weights into the target networks
self.actor_target_network.load_state_dict(
self.actor_network.state_dict())
self.critic_target_network1.load_state_dict(
self.critic_network1.state_dict())
self.critic_target_network2.load_state_dict(
self.critic_network2.state_dict())
# if use gpu
self.rank = MPI.COMM_WORLD.Get_rank()
if args.cuda:
device = 'cuda:{}'.format(self.rank % torch.cuda.device_count())
else:
device = 'cpu'
self.device = torch.device(device)
if self.args.cuda:
self.actor_network.cuda(self.device)
self.critic_network1.cuda(self.device)
self.critic_network2.cuda(self.device)
self.actor_target_network.cuda(self.device)
self.critic_target_network1.cuda(self.device)
self.critic_target_network2.cuda(self.device)
# create the optimizer
self.actor_optim = torch.optim.Adam(self.actor_network.parameters(),
lr=self.args.lr_actor)
self.critic_optim1 = torch.optim.Adam(
self.critic_network1.parameters(), lr=self.args.lr_critic)
self.critic_optim2 = torch.optim.Adam(
self.critic_network2.parameters(), lr=self.args.lr_critic)
# her sampler
self.her_module = her_sampler(self.args.replay_strategy,
self.args.replay_k,
self.env.compute_reward)
# create the replay buffer
self.buffer = replay_buffer(self.env_params, self.args.buffer_size,
self.her_module.sample_her_transitions)
# create the normalizer
self.o_norm = normalizer(size=env_params['obs'],
default_clip_range=self.args.clip_range)
self.g_norm = normalizer(size=env_params['goal'],
default_clip_range=self.args.clip_range)
self.logger.setup_pytorch_saver(self.actor_network)
def learn(self):
"""
train the network
"""
# start to collect samples
for epoch in range(self.args.n_epochs):
for _ in range(self.args.n_cycles):
mb_obs, mb_ag, mb_g, mb_actions = [], [], [], []
for _ in range(self.args.num_rollouts_per_mpi):
# reset the rollouts
ep_obs, ep_ag, ep_g, ep_actions = [], [], [], []
# reset the environment
observation = self.env.reset()
obs = observation['observation']
ag = observation['achieved_goal']
g = observation['desired_goal']
# start to collect samples
for t in range(self.env_params['max_timesteps']):
with torch.no_grad():
input_tensor = self._preproc_inputs(obs, g)
pi = self.actor_network(input_tensor)
action = self._select_actions(pi)
# feed the actions into the environment
observation_new, _, _, info = self.env.step(action)
obs_new = observation_new['observation']
ag_new = observation_new['achieved_goal']
# append rollouts
ep_obs.append(obs.copy())
ep_ag.append(ag.copy())
ep_g.append(g.copy())
ep_actions.append(action.copy())
# re-assign the observation
obs = obs_new
ag = ag_new
ep_obs.append(obs.copy())
ep_ag.append(ag.copy())
mb_obs.append(ep_obs)
mb_ag.append(ep_ag)
mb_g.append(ep_g)
mb_actions.append(ep_actions)
# convert them into arrays
mb_obs = np.array(mb_obs)
mb_ag = np.array(mb_ag)
mb_g = np.array(mb_g)
mb_actions = np.array(mb_actions)
# store the episodes
self.buffer.store_episode([mb_obs, mb_ag, mb_g, mb_actions])
self._update_normalizer([mb_obs, mb_ag, mb_g, mb_actions])
for _ in range(self.args.n_batches):
# train the network
self._update_network()
# soft update
self._soft_update_target_network(self.actor_target_network,
self.actor_network)
self._soft_update_target_network(self.critic_target_network1,
self.critic_network1)
self._soft_update_target_network(self.critic_target_network2,
self.critic_network2)
# start to do the evaluation
success_rate = self._eval_agent()
# save some necessary objects
# self.logger.save_state will also save pytorch's model implicitly.
# self.logger.save_state({'env':self.env, 'o_norm':self.o_norm, 'g_norm':self.g_norm}, None)
state = {
'env': self.env,
'o_norm': self.o_norm.get(),
'g_norm': self.g_norm.get()
}
self.logger.save_state(state, None)
t = ((epoch + 1) * self.args.n_cycles *
self.args.num_rollouts_per_mpi * MPI.COMM_WORLD.Get_size() *
self.env_params['max_timesteps'])
self.logger.log_tabular('Epoch', epoch + 1)
self.logger.log_tabular('SuccessRate', success_rate)
self.logger.log_tabular('LossPi')
self.logger.log_tabular('LossQ')
self.logger.log_tabular('TotalEnvInteracts', t)
self.logger.dump_tabular()
# pre_process the inputs
def _preproc_inputs(self, obs, g):
obs_norm = self.o_norm.normalize(obs)
g_norm = self.g_norm.normalize(g)
# concatenate the stuffs
inputs = np.concatenate([obs_norm, g_norm])
inputs = torch.tensor(inputs, dtype=torch.float32).unsqueeze(0)
if self.args.cuda:
inputs = inputs.cuda(self.device)
return inputs
# this function will choose action for the agent and do the exploration
def _select_actions(self, pi):
action = pi.cpu().numpy().squeeze()
# add the gaussian
action += self.args.noise_eps * self.env_params[
'action_max'] * np.random.randn(*action.shape)
action = np.clip(action, -self.env_params['action_max'],
self.env_params['action_max'])
# random actions...
random_actions = np.random.uniform(low=-self.env_params['action_max'], high=self.env_params['action_max'], \
size=self.env_params['action'])
# choose if use the random actions
action += np.random.binomial(1, self.args.random_eps,
1)[0] * (random_actions - action)
return action
# update the normalizer
def _update_normalizer(self, episode_batch):
mb_obs, mb_ag, mb_g, mb_actions = episode_batch
mb_obs_next = mb_obs[:, 1:, :]
mb_ag_next = mb_ag[:, 1:, :]
# get the number of normalization transitions
num_transitions = mb_actions.shape[1]
# create the new buffer to store them
buffer_temp = {
'obs': mb_obs,
'ag': mb_ag,
'g': mb_g,
'actions': mb_actions,
'obs_next': mb_obs_next,
'ag_next': mb_ag_next,
}
transitions = self.her_module.sample_her_transitions(
buffer_temp, num_transitions)
obs, g = transitions['obs'], transitions['g']
# pre process the obs and g
transitions['obs'], transitions['g'] = self._preproc_og(obs, g)
# update
self.o_norm.update(transitions['obs'])
self.g_norm.update(transitions['g'])
# recompute the stats
self.o_norm.recompute_stats()
self.g_norm.recompute_stats()
def _preproc_og(self, o, g):
o = np.clip(o, -self.args.clip_obs, self.args.clip_obs)
g = np.clip(g, -self.args.clip_obs, self.args.clip_obs)
return o, g
# soft update
def _soft_update_target_network(self, target, source):
for target_param, param in zip(target.parameters(),
source.parameters()):
target_param.data.copy_((1 - self.args.polyak) * param.data +
self.args.polyak * target_param.data)
# update the network
def _update_network(self):
# sample the episodes
transitions = self.buffer.sample(self.args.batch_size)
# pre-process the observation and goal
o, o_next, g = transitions['obs'], transitions[
'obs_next'], transitions['g']
transitions['obs'], transitions['g'] = self._preproc_og(o, g)
transitions['obs_next'], transitions['g_next'] = self._preproc_og(
o_next, g)
# start to do the update
obs_norm = self.o_norm.normalize(transitions['obs'])
g_norm = self.g_norm.normalize(transitions['g'])
inputs_norm = np.concatenate([obs_norm, g_norm], axis=1)
obs_next_norm = self.o_norm.normalize(transitions['obs_next'])
g_next_norm = self.g_norm.normalize(transitions['g_next'])
inputs_next_norm = np.concatenate([obs_next_norm, g_next_norm], axis=1)
# transfer them into the tensor
inputs_norm_tensor = torch.tensor(inputs_norm, dtype=torch.float32)
inputs_next_norm_tensor = torch.tensor(inputs_next_norm,
dtype=torch.float32)
actions_tensor = torch.tensor(transitions['actions'],
dtype=torch.float32)
r_tensor = torch.tensor(transitions['r'], dtype=torch.float32)
if self.args.cuda:
inputs_norm_tensor = inputs_norm_tensor.cuda(self.device)
inputs_next_norm_tensor = inputs_next_norm_tensor.cuda(self.device)
actions_tensor = actions_tensor.cuda(self.device)
r_tensor = r_tensor.cuda(self.device)
# calculate the target Q value function
with torch.no_grad():
# do the normalization
# concatenate the stuffs
actions_next = self.actor_target_network(inputs_next_norm_tensor)
actions_next += self.args.noise_eps * self.env_params[
'action_max'] * torch.randn(actions_next.shape).cuda(
self.device)
actions_next = torch.clamp(actions_next,
-self.env_params['action_max'],
self.env_params['action_max'])
q_next_value1 = self.critic_target_network1(
inputs_next_norm_tensor, actions_next)
q_next_value2 = self.critic_target_network2(
inputs_next_norm_tensor, actions_next)
target_q_value = r_tensor + self.args.gamma * torch.min(
q_next_value1, q_next_value2)
# clip the q value
clip_return = 1 / (1 - self.args.gamma)
target_q_value = torch.clamp(target_q_value, -clip_return, 0)
target_q_value = target_q_value.detach()
# the q loss
real_q_value1 = self.critic_network1(inputs_norm_tensor,
actions_tensor)
critic_loss1 = (target_q_value - real_q_value1).pow(2).mean()
real_q_value2 = self.critic_network2(inputs_norm_tensor,
actions_tensor)
critic_loss2 = (target_q_value - real_q_value2).pow(2).mean()
# the actor loss
actions_real = self.actor_network(inputs_norm_tensor)
actor_loss = -torch.min(
self.critic_network1(inputs_norm_tensor, actions_real),
self.critic_network2(inputs_norm_tensor, actions_real)).mean()
actor_loss += self.args.action_l2 * (
actions_real / self.env_params['action_max']).pow(2).mean()
# start to update the network
self.actor_optim.zero_grad()
actor_loss.backward()
sync_grads(self.actor_network)
self.actor_optim.step()
# update the critic_network
self.critic_optim1.zero_grad()
critic_loss1.backward()
sync_grads(self.critic_network1)
self.critic_optim1.step()
self.critic_optim2.zero_grad()
critic_loss2.backward()
sync_grads(self.critic_network2)
self.critic_optim2.step()
self.logger.store(LossPi=actor_loss.detach().cpu().numpy())
self.logger.store(LossQ=(critic_loss1 +
critic_loss2).detach().cpu().numpy())
# do the evaluation
def _eval_agent(self):
total_success_rate = []
for _ in range(self.args.n_test_rollouts):
per_success_rate = []
observation = self.env.reset()
obs = observation['observation']
g = observation['desired_goal']
for _ in range(self.env_params['max_timesteps']):
with torch.no_grad():
input_tensor = self._preproc_inputs(obs, g)
pi = self.actor_network(input_tensor)
# convert the actions
actions = pi.detach().cpu().numpy().squeeze()
observation_new, _, _, info = self.env.step(actions)
obs = observation_new['observation']
g = observation_new['desired_goal']
per_success_rate.append(info['is_success'])
total_success_rate.append(per_success_rate)
total_success_rate = np.array(total_success_rate)
local_success_rate = np.mean(total_success_rate[:, -1])
global_success_rate = MPI.COMM_WORLD.allreduce(local_success_rate,
op=MPI.SUM)
return global_success_rate / MPI.COMM_WORLD.Get_size()
def sac(env_fn,
seed=0,
gamma=.99,
lam=.97,
hidden_sizes=(200, 100),
alpha=.5,
v_lr=1e-3,
q_lr=1e-3,
pi_lr=1e-3,
polyak=1e-2,
epochs=50,
steps_per_epoch=1000,
batch_size=100,
start_steps=10000,
logger_kwargs=dict(),
replay_size=int(1e6),
max_ep_len=1000,
save_freq=1):
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
tf.set_random_seed(seed)
np.random.seed(seed)
env, test_env = env_fn(), env_fn()
env = env_fn()
# Dimensions
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
act_limit = env.action_space.high[0]
# Placeholders
x_ph = tf.placeholder(shape=[None, obs_dim], dtype=tf.float32)
a_ph = tf.placeholder(shape=[None, act_dim], dtype=tf.float32)
x2_ph = tf.placeholder(shape=[None, obs_dim], dtype=tf.float32)
r_ph = tf.placeholder(shape=[None], dtype=tf.float32)
d_ph = tf.placeholder(shape=[None], dtype=tf.float32)
# Networks
def mlp(x,
hidden_sizes=(32, ),
activation=tf.tanh,
output_activation=None):
for h in hidden_sizes[:-1]:
x = tf.layers.dense(x, units=h, activation=activation)
return tf.layers.dense(x,
units=hidden_sizes[-1],
activation=output_activation)
# Why isn't the k used here ?
def gaussian_likelihood(x, mu, log_std):
EPS = 1e-8
pre_sum = -0.5 * (
((x - mu) /
(tf.exp(log_std) + EPS))**2 + 2 * log_std + np.log(2 * np.pi))
return tf.reduce_sum(pre_sum, axis=1)
def clip_but_pass_gradient(x, l=-1., u=1.):
clip_up = tf.cast(x > u, tf.float32)
clip_low = tf.cast(x < l, tf.float32)
return x + tf.stop_gradient((u - x) * clip_up + (l - x) * clip_low)
LOG_STD_MIN = -20
LOG_STD_MAX = 2
def mlp_gaussian_policy(x, a, hidden_sizes, activation, output_activation):
act_dim = a.shape.as_list()[-1]
net = mlp(x, list(hidden_sizes), activation, activation)
mu = tf.layers.dense(net, act_dim, activation=output_activation)
"""
Because algorithm maximizes trade-off of reward and entropy,
entropy must be unique to state---and therefore log_stds need
to be a neural network output instead of a shared-across-states
learnable parameter vector. But for deep Relu and other nets,
simply sticking an activationless dense layer at the end would
be quite bad---at the beginning of training, a randomly initialized
net could produce extremely large values for the log_stds, which
would result in some actions being either entirely deterministic
or too random to come back to earth. Either of these introduces
numerical instability which could break the algorithm. To
protect against that, we'll constrain the output range of the
log_stds, to lie within [LOG_STD_MIN, LOG_STD_MAX]. This is
slightly different from the trick used by the original authors of
SAC---they used tf.clip_by_value instead of squashing and rescaling.
I prefer this approach because it allows gradient propagation
through log_std where clipping wouldn't, but I don't know if
it makes much of a difference.
"""
log_std = tf.layers.dense(net, act_dim, activation=tf.tanh)
log_std = LOG_STD_MIN + 0.5 * (LOG_STD_MAX - LOG_STD_MIN) * (log_std +
1)
std = tf.exp(log_std)
pi = mu + tf.random_normal(tf.shape(mu)) * std
logp_pi = gaussian_likelihood(pi, mu, log_std)
return mu, pi, logp_pi
def apply_squashing_func(mu, pi, logp_pi):
mu = tf.tanh(mu)
pi = tf.tanh(pi)
# To avoid evil machine precision error, strictly clip 1-pi**2 to [0,1] range.
logp_pi -= tf.reduce_sum(
tf.log(clip_but_pass_gradient(1 - pi**2, l=0, u=1) + 1e-6), axis=1)
return mu, pi, logp_pi
with tf.variable_scope("main"):
activation = tf.tanh
with tf.variable_scope("pi"):
# mu = mlp( x_ph, hidden_sizes, activation, None)
# log_std = mlp( mu, (act_dim,), activation, None)
# # Avoid out of range log_std. Refer to Github for explanation.
# log_std = LOG_STD_MIN + .5 * ( LOG_STD_MAX - LOG_STD_MIN) * (log_std + 1)
#
# mu = mlp( mu, (act_dim,), activation, None)
#
# pi = mu + tf.exp( log_std) * tf.random_normal( tf.shape(mu))
# logp_pi = gaussian_likelihood( pi, mu, log_std)
#
# # Follow SpinningUp Implementation
# mu = tf.tanh(mu)
# pi = tf.tanh(pi)
#
# def clip_but_pass_gradient(x, l=-1., u=1.):
# clip_up = tf.cast(x > u, tf.float32)
# clip_low = tf.cast(x < l, tf.float32)
# # What is this supposed to mean even ?
# return x + tf.stop_gradient((u - x)*clip_up + (l - x)*clip_low)
#
# # Shameless copy paste
# logp_pi -= tf.reduce_sum(tf.log(clip_but_pass_gradient(1 - pi**2, l=0, u=1) + 1e-6), axis=1)
# Not working version bak
# squashed_pi = tf.tanh( pi)
#
# # To be sure
# pi = tf.clip_by_value( pi, -act_limit, act_limit)
#
# # Must take in the squased polic
# log_squash_pi = gaussian_likelihood( squashed_pi, mu, log_std)
# Shamefull plug
mu, pi, logp_pi = mlp_gaussian_policy(x_ph, a_ph, hidden_sizes,
tf.tanh, None)
mu, pi, logp_pi = apply_squashing_func(mu, pi, logp_pi)
with tf.variable_scope("q1"):
q1 = tf.squeeze(mlp(tf.concat([x_ph, a_ph], -1),
hidden_sizes + (1, ), activation, None),
axis=-1)
with tf.variable_scope("q1", reuse=True):
q1_pi = tf.squeeze(mlp(tf.concat([x_ph, pi], -1),
hidden_sizes + (1, ), activation, None),
axis=-1)
with tf.variable_scope("q2"):
q2 = tf.squeeze(mlp(tf.concat([x_ph, a_ph], -1),
hidden_sizes + (1, ), activation, None),
axis=-1)
with tf.variable_scope("q2", reuse=True):
q2_pi = tf.squeeze(mlp(tf.concat([x_ph, pi], -1),
hidden_sizes + (1, ), activation, None),
axis=-1)
with tf.variable_scope("v"):
# v = mlp( x_ph, hidden_sizes+(1,), activation, None)
v = tf.squeeze(mlp(x_ph, hidden_sizes + (1, ), activation, None),
axis=-1)
with tf.variable_scope("target"):
with tf.variable_scope("v"):
v_targ = tf.squeeze(mlp(x2_ph, hidden_sizes + (1, ), activation,
None),
axis=-1)
# helpers for var count
def get_vars(scope=''):
return [x for x in tf.trainable_variables() if scope in x.name]
def count_vars(scope=''):
v = get_vars(scope)
return sum([np.prod(var.shape.as_list()) for var in v])
# Count variables
var_counts = tuple(
count_vars(scope)
for scope in ['main/pi', 'main/q1', 'main/q2', 'main/v', 'main'])
print(
'\nNumber of parameters: \t pi: %d, \t q1: %d, \t q2: %d, \t v: %d, \t total: %d\n'
% var_counts)
# Targets
q_backup_prestop = r_ph + gamma * (1 - d_ph) * v_targ
v_backup_prestop = tf.minimum(q1_pi, q2_pi) - alpha * logp_pi
q_backup, v_backup = tf.stop_gradient(q_backup_prestop), tf.stop_gradient(
v_backup_prestop)
# Q Loss
q1_loss = tf.reduce_mean((q1 - q_backup)**2)
q2_loss = tf.reduce_mean((q2 - q_backup)**2)
q_loss = q1_loss + q2_loss
# V Loss
v_loss = tf.reduce_mean((v - v_backup)**2)
# Pol loss
pi_loss = tf.reduce_mean(-q1_pi + alpha * logp_pi)
# Training ops
v_trainop = tf.train.AdamOptimizer(v_lr).minimize(
v_loss,
var_list=tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope="main/v"))
q_trainop = tf.train.AdamOptimizer(q_lr).minimize(
q_loss,
var_list=tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope="main/q"))
pi_trainop = tf.train.AdamOptimizer(pi_lr).minimize(
pi_loss,
var_list=tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope="main/pi"))
assert polyak <= .5
# Target update op
init_v_target = tf.group([
tf.assign(v_target, v_main) for v_main, v_target in zip(
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="main/v"),
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="target/v"))
])
update_v_target = tf.group([
tf.assign(v_target, (1 - polyak) * v_target + polyak * v_main)
for v_main, v_target in zip(
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="main/v"),
tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="target/v"))
])
sess = tf.Session()
sess.run(tf.global_variables_initializer())
sess.run(init_v_target)
# Setup model saving
logger.setup_tf_saver(sess,
inputs={
'x': x_ph,
'a': a_ph
},
outputs={
'pi': pi,
'q1': q1,
'q2': q2,
'v': v
})
def test_agent(n=10):
for j in range(n):
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0, 0
# print( o.reshape(-1, 1))
# input()
while not (d or (ep_len == max_ep_len)):
o, r, d, _ = test_env.step(
sess.run(pi, feed_dict={x_ph: o.reshape(1, -1)}))
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
#Buffer init
buffer = ReplayBuffer(obs_dim, act_dim, replay_size)
# Main loop
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
total_steps = steps_per_epoch * epochs
for t in range(total_steps):
if t > start_steps:
a = sess.run(pi, feed_dict={x_ph: o.reshape(1, -1)})
else:
a = env.action_space.sample()
o2, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
o2, r, d, _ = env.step(o)
d = False or (ep_len == max_ep_len)
# Still needed ?
o2 = np.squeeze(o2)
buffer.store(o, a, r, o2, d)
o = o2
if d or (ep_len == max_ep_len):
for j in range(ep_len):
batch = buffer.sample_batch(batch_size)
feed_dict = {
x_ph: batch['obs'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done']
}
# DEBUG:
# v_backup_prestop_out = sess.run( v_backup_prestop, feed_dict=feed_dict)
# print( v_backup_prestop_out.shape)
# print( v_backup_prestop_out)
# input()
# Value gradient steps
v_step_ops = [v_loss, v, v_trainop]
outs = sess.run(v_step_ops, feed_dict)
logger.store(LossV=outs[0], VVals=outs[1])
# Q Gradient steps
q_step_ops = [q_loss, q1, q2, q_trainop]
outs = sess.run(q_step_ops, feed_dict)
logger.store(LossQ=outs[0], Q1Vals=outs[1], Q2Vals=outs[2])
# Policy gradient steps
# TODO Add entropy logging
pi_step_ops = [pi_loss, pi_trainop, update_v_target]
outs = sess.run(pi_step_ops, feed_dict=feed_dict)
logger.store(LossPi=outs[0])
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0., 0
if t > 0 and t % steps_per_epoch == 0:
epoch = t // steps_per_epoch
# Saving the model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('Q1Vals', with_min_and_max=True)
logger.log_tabular('Q2Vals', with_min_and_max=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
def ddpg(env_config, ac_type, ac_kwargs, rb_type, rb_kwargs, gamma, lr, polyak,
batch_size, epochs, start_steps, steps_per_epoch, inc_ep, max_ep_len,
test_max_ep_len, number_of_tests_per_epoch, act_noise, logger_kwargs,
seed):
logger = EpochLogger(**logger_kwargs)
configs = locals().copy()
configs.pop("logger")
logger.save_config(configs)
tf.set_random_seed(seed)
np.random.seed(seed)
env, test_env = make_env(env_config), make_env(env_config)
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
# Action limit for clamping: critically, assumes all dimensions share the same bound!
act_high = env.action_space.high
# Inputs to computation graph
x_ph, a_ph, x2_ph, r_ph, d_ph = core.placeholders(obs_dim, act_dim,
obs_dim, None, None)
actor_critic = core.get_ddpg_actor_critic(ac_type)
# Main outputs from computation graph
with tf.variable_scope('main'):
pi, q, q_pi = actor_critic(x_ph, a_ph, **ac_kwargs)
# Target networks
with tf.variable_scope('target'):
pi_targ, _, q_pi_targ = actor_critic(x2_ph, a_ph, **ac_kwargs)
# Experience buffer
RB = get_replay_buffer(rb_type)
replay_buffer = RB(obs_dim, act_dim, **rb_kwargs)
# Count variables
var_counts = tuple(
core.count_vars(scope) for scope in ['main/pi', 'main/q', 'main'])
print('\nNumber of parameters: \t pi: %d, \t q: %d, \t total: %d\n' %
var_counts)
# Bellman backup for Q function
backup = tf.stop_gradient(r_ph + gamma * (1 - d_ph) * q_pi_targ)
# DDPG losses
pi_loss = -tf.reduce_mean(q_pi)
q_loss = tf.reduce_mean((q - backup)**2)
# Separate train ops for pi, q
pi_optimizer = tf.train.AdamOptimizer(learning_rate=lr)
q_optimizer = tf.train.AdamOptimizer(learning_rate=lr)
train_pi_op = pi_optimizer.minimize(pi_loss, var_list=get_vars('main/pi'))
train_q_op = q_optimizer.minimize(q_loss, var_list=get_vars('main/q'))
# Polyak averaging for target variables
target_update = tf.group([
tf.assign(v_targ, polyak * v_targ + (1 - polyak) * v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
# Initializing targets to match main variables
target_init = tf.group([
tf.assign(v_targ, v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
sess = tf.Session()
sess.run(tf.global_variables_initializer())
sess.run(target_init)
def get_action(o, noise_scale):
pi_a = sess.run(pi, feed_dict={x_ph: o.reshape(1, -1)})[0]
pi_a += noise_scale * np.random.randn(act_dim)
pi_a = np.clip(pi_a, 0, 1)
real_a = pi_a * act_high
return pi_a, real_a
def test_agent(n=10):
test_actions = []
for j in range(n):
test_actions_ep = []
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0, 0
while not (d or (ep_len == test_max_ep_len)):
# Take deterministic actions at test time (noise_scale=0)
_, real_a = get_action(o, 0)
test_actions_ep.append(real_a)
o, r, d, _ = test_env.step(real_a)
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
test_actions.append(test_actions_ep)
return test_actions
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
total_steps = steps_per_epoch * epochs
actions = []
epoch_actions = []
rewards = []
rets = []
test_rets = []
max_ret = None
# Main loop: collect experience in env and update/log each epoch
for t in range(total_steps):
"""
Until start_steps have elapsed, randomly sample actions
from a uniform distribution for better exploration. Afterwards,
use the learned policy (with some noise, via act_noise).
"""
if t > start_steps:
pi_a, real_a = get_action(o, act_noise)
else:
pi_a, real_a = env.action_space.sample()
# Step the env
o2, r, d, _ = env.step(real_a)
ep_ret += r
ep_len += 1
epoch_actions.append(pi_a)
# Ignore the "done" signal if it comes from hitting the time
# horizon (that is, when it's an artificial terminal signal
# that isn't based on the agent's state)
d = False if ep_len == max_ep_len else d
# Store experience to replay buffer
replay_buffer.store(o, pi_a, r, o2, d)
# Super critical, easy to overlook step: make sure to update
# most recent observation!
o = o2
if d or (ep_len == max_ep_len):
"""
Perform all DDPG updates at the end of the trajectory,
in accordance with tuning done by TD3 paper authors.
"""
for _ in range(ep_len):
batch = replay_buffer.sample_batch(batch_size)
feed_dict = {
x_ph: batch['obs1'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done']
}
# Q-learning update
outs = sess.run([q_loss, q, train_q_op], feed_dict)
logger.store(LossQ=outs[0], QVals=outs[1])
# Policy update
outs = sess.run([pi_loss, train_pi_op, target_update],
feed_dict)
logger.store(LossPi=outs[0])
logger.store(EpRet=ep_ret, EpLen=ep_len)
actions.append(np.mean(epoch_actions))
epoch_actions = []
rewards.append(ep_ret)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
# End of epoch wrap-up
if (t + 1) % steps_per_epoch == 0:
epoch = (t + 1) // steps_per_epoch
# Test the performance of the deterministic version of the agent.
test_actions = test_agent(number_of_tests_per_epoch)
# Log info about epoch
logger.log_tabular('Epoch', epoch)
ret = logger.log_tabular('EpRet', average_only=True)
test_ret = logger.log_tabular('TestEpRet', average_only=True)[0]
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('QVals', average_only=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
rets.append(ret)
test_rets.append(test_ret)
if max_ret is None or test_ret > max_ret:
max_ret = test_ret
best_test_actions = test_actions
max_ep_len += inc_ep
util.plot_actions(test_actions, act_high,
logger.output_dir + '/actions%s.png' % epoch)
logger.save_state(
{
"actions": actions,
"rewards": rewards,
"best_test_actions": best_test_actions,
"rets": rets,
"test_rets": test_rets,
"max_ret": max_ret
}, None)
util.plot_actions(best_test_actions, act_high,
logger.output_dir + '/best_test_actions.png')
logger.log("max ret: %f" % max_ret)
def __init__(self, args, env, env_params):
self.args = args
# path to save the model
self.exp_name = '_'.join(
(self.args.env_name, self.args.alg, str(self.args.seed),
datetime.now().isoformat()))
self.data_path = os.path.join(
self.args.save_dir, '_'.join((self.args.env_name, self.args.alg)),
self.exp_name)
self.logger = EpochLogger(output_dir=self.data_path,
exp_name=self.exp_name)
self.logger.save_config(args)
self.env = env
self.env_params = env_params
# create the network
self.actor_network = actor(env_params)
self.critic_network1 = critic(env_params)
self.critic_network2 = critic(env_params)
# sync the networks across the cpus
sync_networks(self.actor_network)
sync_networks(self.critic_network1)
sync_networks(self.critic_network2)
# build up the target network
# self.actor_target_network = actor(env_params)
self.critic_target_network1 = critic(env_params)
self.critic_target_network2 = critic(env_params)
# load the weights into the target networks
# self.actor_target_network.load_state_dict(self.actor_network.state_dict())
self.critic_target_network1.load_state_dict(
self.critic_network1.state_dict())
self.critic_target_network2.load_state_dict(
self.critic_network2.state_dict())
# if use gpu
self.rank = MPI.COMM_WORLD.Get_rank()
if args.cuda:
device = 'cuda:{}'.format(self.rank % torch.cuda.device_count())
self.device = torch.device(device)
if self.args.cuda:
self.actor_network.cuda(self.device)
self.critic_network1.cuda(self.device)
self.critic_network2.cuda(self.device)
# self.actor_target_network.cuda(self.device)
self.critic_target_network1.cuda(self.device)
self.critic_target_network2.cuda(self.device)
# create the optimizer
self.actor_optim = torch.optim.Adam(self.actor_network.parameters(),
lr=self.args.lr_actor)
self.critic_optim1 = torch.optim.Adam(
self.critic_network1.parameters(), lr=self.args.lr_critic)
self.critic_optim2 = torch.optim.Adam(
self.critic_network2.parameters(), lr=self.args.lr_critic)
# her sampler
self.her_module = her_sampler(self.args.replay_strategy,
self.args.replay_k,
self.env.compute_reward)
# create the replay buffer
self.buffer = replay_buffer(self.env_params, self.args.buffer_size,
self.her_module.sample_her_transitions)
# create the normalizer
self.o_norm = normalizer(size=env_params['obs'],
default_clip_range=self.args.clip_range)
self.g_norm = normalizer(size=env_params['goal'],
default_clip_range=self.args.clip_range)
self.logger.setup_pytorch_saver(self.actor_network)
# auto temperature
if self.args.alpha < 0.0:
# if self.args.alpha < 0.0,
# sac will use auto temperature and init alpha = - self.args.alpha
self.alpha = -self.args.alpha
self.log_alpha = torch.tensor(np.log(self.alpha),
dtype=torch.float32,
device=device,
requires_grad=True)
self.target_entropy = -np.prod(env.action_space.shape).astype(
np.float32)
self.target_entropy = self.target_entropy / 2.0
self.alpha_optim = torch.optim.Adam([self.log_alpha],
lr=self.args.lr_actor)
else:
self.alpha = self.args.alpha
self.alpha = torch.tensor(self.alpha)
def ppo(env_fn, actor_critic=core.mlp_actor_critic, ac_kwargs=dict(), seed=0, gru_units=256,
trials_per_epoch=100, episodes_per_trial=2, n = 100, epochs=100, gamma=0.99, clip_ratio=0.2, pi_lr=3e-4,
vf_lr=1e-3, train_pi_iters=1000, train_v_iters=80, lam=0.97, max_ep_len=1000,
target_kl=0.01, logger_kwargs=dict(), save_freq=10):
"""
Args:
env_fn : A function which creates a copy of the environment.
The environment must satisfy the OpenAI Gym API.
actor_critic: A function which takes in placeholder symbols
for state, ``x_ph``, and action, ``a_ph``, and returns the main
outputs from the agent's Tensorflow computation graph:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``pi`` (batch, act_dim) | Samples actions from policy given
| states.
``logp`` (batch,) | Gives log probability, according to
| the policy, of taking actions ``a_ph``
| in states ``x_ph``.
``logp_pi`` (batch,) | Gives log probability, according to
| the policy, of the action sampled by
| ``pi``.
``v`` (batch,) | Gives the value estimate for states
| in ``x_ph``. (Critical: make sure
| to flatten this!)
=========== ================ ======================================
ac_kwargs (dict): Any kwargs appropriate for the actor_critic
function you provided to PPO.
seed (int): Seed for random number generators.
steps_per_epoch (int): Number of steps of interaction (state-action pairs)
for the agent and the environment in each epoch.
epochs (int): Number of epochs of interaction (equivalent to
number of policy updates) to perform.
gamma (float): Discount factor. (Always between 0 and 1.)
clip_ratio (float): Hyperparameter for clipping in the policy objective.
Roughly: how far can the new policy go from the old policy while
still profiting (improving the objective function)? The new policy
can still go farther than the clip_ratio says, but it doesn't help
on the objective anymore. (Usually small, 0.1 to 0.3.)
pi_lr (float): Learning rate for policy optimizer.
vf_lr (float): Learning rate for value function optimizer.
train_pi_iters (int): Maximum number of gradient descent steps to take
on policy loss per epoch. (Early stopping may cause optimizer
to take fewer than this.)
train_v_iters (int): Number of gradient descent steps to take on
value function per epoch.
lam (float): Lambda for GAE-Lambda. (Always between 0 and 1,
close to 1.)
max_ep_len (int): Maximum length of trajectory / episode / rollout.
target_kl (float): Roughly what KL divergence we think is appropriate
between new and old policies after an update. This will get used
for early stopping. (Usually small, 0.01 or 0.05.)
logger_kwargs (dict): Keyword args for EpochLogger.
save_freq (int): How often (in terms of gap between epochs) to save
the current policy and value function.
"""
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
tf.set_random_seed(seed)
np.random.seed(seed)
env = env_fn()
obs_dim = env.observation_space.shape
act_dim = env.action_space.shape
# Share information about action space with policy architecture
ac_kwargs['action_space'] = env.action_space
# Inputs to computation graph\
raw_input_ph = tf.placeholder(dtype=tf.float32, shape=obs_dim, name='raw_input_ph')
rescale_image_op = tf.image.resize_images(raw_input_ph, [30, 40])
max_seq_len_ph = tf.placeholder(dtype=tf.int32, shape=(), name='max_seq_len_ph')
seq_len_ph = tf.placeholder(dtype=tf.int32, shape=(None,))
# Because we pad zeros at the end of every sequence of length less than max length, we need to mask these zeros out
# when computing loss
seq_len_mask_ph = tf.placeholder(dtype=tf.int32, shape=(trials_per_epoch, episodes_per_trial * max_ep_len))
# rescaled_image_ph This is a ph because we want to be able to pass in value to this node manually
rescaled_image_in_ph = tf.placeholder(dtype=tf.float32, shape=[None, 30, 40, 3], name='rescaled_image_in_ph')
a_ph = core.placeholders_from_spaces( env.action_space)[0]
conv1 = slim.conv2d(activation_fn=tf.nn.relu, inputs=rescaled_image_in_ph, num_outputs=16, kernel_size=[5,5],
stride=2)
image_out = slim.flatten(slim.conv2d(activation_fn=tf.nn.relu, inputs=conv1, num_outputs=16, kernel_size=[5,5],
stride=2))
rew_ph, adv_ph, ret_ph, logp_old_ph = core.placeholders(1, None, None, None)
rnn_state_ph = tf.placeholder(tf.float32, [None, gru_units], name='pi_rnn_state_ph')
# Main outputs from computation graph
action_encoder_matrix = np.load(r'encoder.npy')
pi, logp, logp_pi, v, rnn_state, logits, seq_len_vec, tmp_vec = actor_critic(
image_out, a_ph, rew_ph, rnn_state_ph, gru_units,
max_seq_len_ph, action_encoder_matrix, seq_len=seq_len_ph, action_space=env.action_space)
# Need all placeholders in *this* order later (to zip with data from buffer)
all_phs = [rescaled_image_in_ph, a_ph, adv_ph, ret_ph, logp_old_ph, rew_ph]
# Every step, get: action, value, and logprob
get_action_ops = [pi, v, logp_pi, rnn_state, logits]
# Experience buffer
buffer_size = trials_per_epoch * episodes_per_trial * max_ep_len
buf = PPOBuffer(rescaled_image_in_ph.get_shape().as_list()[1:], act_dim, buffer_size, trials_per_epoch, gamma, lam)
# Count variables
var_counts = tuple(core.count_vars(scope) for scope in ['pi', 'v'])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n'%var_counts)
# PPO objectives
ratio = tf.exp(logp - logp_old_ph) # pi(a|s) / pi_old(a|s)
min_adv = tf.where(adv_ph>0, (1+clip_ratio)*adv_ph, (1-clip_ratio)*adv_ph)
# Need to mask out the padded zeros when computing loss
sequence_mask = tf.sequence_mask(seq_len_ph, episodes_per_trial*max_ep_len)
# Convert bool tensor to int tensor with 1 and 0
sequence_mask = tf.where(sequence_mask,
np.ones(dtype=np.float32, shape=(trials_per_epoch, episodes_per_trial*max_ep_len)),
np.zeros(dtype=np.float32, shape=(trials_per_epoch, episodes_per_trial*max_ep_len)))
# need to reshape because ratio is a 1-D vector (it is a concatnation of all sequence) for masking and then reshape
# it back
pi_loss_vec = tf.multiply(sequence_mask, tf.reshape(tf.minimum(ratio * adv_ph, min_adv), tf.shape(sequence_mask)))
pi_loss = -tf.reduce_mean(tf.reshape(pi_loss_vec, tf.shape(ratio)))
aaa = (ret_ph - v)**2
v_loss_vec = tf.multiply(sequence_mask, tf.reshape((ret_ph - v)**2, tf.shape(sequence_mask)))
ccc = tf.reshape(v_loss_vec, tf.shape(v))
v_loss = tf.reduce_mean(tf.reshape(v_loss_vec, tf.shape(v)))
# Info (useful to watch during learning)
approx_kl = tf.reduce_mean(logp_old_ph - logp) # a sample estimate for KL-divergence, easy to compute
approx_ent = tf.reduce_mean(-logp) # a sample estimate for entropy, also easy to compute
clipped = tf.logical_or(ratio > (1+clip_ratio), ratio < (1-clip_ratio))
clipfrac = tf.reduce_mean(tf.cast(clipped, tf.float32))
# Optimizers
train_pi = MpiAdamOptimizer(learning_rate=pi_lr).minimize(pi_loss)
train_v = MpiAdamOptimizer(learning_rate=vf_lr).minimize(v_loss)
train = MpiAdamOptimizer(learning_rate=1e-4).minimize(pi_loss + 0.01 * v_loss - 0.001 * approx_ent)
sess = tf.Session()
sess.run(tf.global_variables_initializer())
# Sync params across processes
sess.run(sync_all_params())
# Setup model saving
logger.setup_tf_saver(sess, inputs={'rescaled_image_in': rescaled_image_in_ph}, outputs={'pi': pi, 'v': v})
def update():
print(f'Start updating at {datetime.now()}')
inputs = {k:v for k,v in zip(all_phs, buf.get())}
inputs[rnn_state_ph] = np.zeros((trials_per_epoch, gru_units), np.float32)
inputs[max_seq_len_ph] = int(episodes_per_trial * max_ep_len)
inputs[seq_len_ph] = buf.seq_len_buf
pi_l_old, v_l_old, ent = sess.run([pi_loss, v_loss, approx_ent], feed_dict=inputs)
buf.reset()
# Training
print(f'sequence length = {sess.run(seq_len_vec, feed_dict=inputs)}')
for i in range(train_pi_iters):
_, kl, pi_loss_i, v_loss_i, ent = sess.run([train_pi, approx_kl, pi_loss, v_loss, approx_ent], feed_dict=inputs)
print(f'i: {i}, pi_loss: {pi_loss_i}, v_loss: {v_loss_i}, entropy: {ent}')
logger.store(StopIter=i)
# Log changes from update
pi_l_new, v_l_new, kl, cf = sess.run(
[pi_loss, v_loss, approx_kl, clipfrac], feed_dict=inputs)
logger.store(LossPi=pi_l_old, LossV=v_l_old,
KL=kl, Entropy=ent, ClipFrac=cf,
DeltaLossPi=(pi_l_new - pi_l_old),
DeltaLossV=(v_l_new - v_l_old))
print(f'Updating finished at {datetime.now()}')
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), np.zeros(1), False, 0, 0
def recenter_rgb(image, min=0.0, max=255.0):
'''
:param image:
:param min:
:param max:
:return: an image with rgb value re-centered to [-1, 1]
'''
mid = (min + max) / 2.0
return np.apply_along_axis(func1d=lambda x: (x - mid) / mid, axis=2, arr=image)
o_rescaled = recenter_rgb(sess.run(rescale_image_op, feed_dict={raw_input_ph: o}))
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
for trial in range(trials_per_epoch):
# TODO: tweek settings to match the paper
# TODO: find a way to generate mazes
last_a = np.array(0)
last_r = np.array(r)
last_rnn_state = np.zeros((1, gru_units), np.float32)
step_counter = 0
for episode in range(episodes_per_trial):
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
o_rescaled = recenter_rgb(sess.run(rescale_image_op, feed_dict={raw_input_ph: o}))
action_dict = defaultdict(int)
# dirty hard coding to make it print in order
action_dict[0] = 0
action_dict[1] = 0
action_dict[2] = 0
for step in range(max_ep_len):
a, v_t, logp_t, rnn_state_t, logits_t = sess.run(
get_action_ops, feed_dict={
rescaled_image_in_ph: np.expand_dims(o_rescaled, 0),
a_ph: last_a.reshape(-1,),
rew_ph: last_r.reshape(-1,1),
rnn_state_ph: last_rnn_state,
# v_rnn_state_ph: last_v_rnn_state,
max_seq_len_ph: 1,
seq_len_ph: [1]})
action_dict[a[0]] += 1
# save and log
buf.store(o_rescaled, a, r, v_t, logp_t)
logger.store(VVals=v_t)
o, r, d, _ = env.step(a[0])
step_counter += 1
o_rescaled = recenter_rgb(sess.run(rescale_image_op, feed_dict={raw_input_ph: o}))
ep_ret += r
ep_len += 1
last_a = a[0]
last_r = np.array(r)
last_rnn_state = rnn_state_t
terminal = d or (ep_len == max_ep_len)
if terminal or (step==n-1):
if not(terminal):
print('Warning: trajectory cut off by epoch at %d steps.'%ep_len)
# if trajectory didn't reach terminal state, bootstrap value target
last_val = r if d else sess.run(v, feed_dict={rescaled_image_in_ph: np.expand_dims(o_rescaled, 0),
a_ph: last_a.reshape(-1,),
rew_ph: last_r.reshape(-1,1),
rnn_state_ph: last_rnn_state,
max_seq_len_ph: 1,
seq_len_ph: [1]})
buf.finish_path(last_val)
logger.store(EpRet=ep_ret, EpLen=ep_len)
print(f'episode terminated with {step} steps. epoch:{epoch} trial:{trial} episode:{episode}')
break
print(action_dict)
if step_counter < episodes_per_trial * max_ep_len:
buf.pad_zeros(episodes_per_trial * max_ep_len - step_counter)
buf.seq_len_buf[trial] = step_counter
# pad zeros to sequence buffer after each trial
# Save model
if (epoch % save_freq == 0) or (epoch == epochs-1):
logger.save_state({'env': env}, None)
# Perform PPO update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts', (epoch+1)*trials_per_epoch*episodes_per_trial*max_ep_len)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time()-start_time)
logger.dump_tabular()
def ppo(env_fn,
actor_critic=core.MLPActorCritic,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=4000,
epochs=50,
gamma=0.99,
clip_ratio=0.2,
pi_lr=3e-4,
vf_lr=1e-3,
train_pi_iters=80,
train_v_iters=80,
lam=0.97,
max_ep_len=1000,
target_kl=0.01,
logger_kwargs=dict(),
save_freq=10):
"""
Proximal Policy Optimization (by clipping),
with early stopping based on approximate KL
Args:
env_fn : A function which creates a copy of the environment.
The environment must satisfy the OpenAI Gym API.
actor_critic: The constructor method for a PyTorch Module with a
``step`` method, an ``act`` method, a ``pi`` module, and a ``v``
module. The ``step`` method should accept a batch of observations
and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``a`` (batch, act_dim) | Numpy array of actions for each
| observation.
``v`` (batch,) | Numpy array of value estimates
| for the provided observations.
``logp_a`` (batch,) | Numpy array of log probs for the
| actions in ``a``.
=========== ================ ======================================
The ``act`` method behaves the same as ``step`` but only returns ``a``.
The ``pi`` module's forward call should accept a batch of
observations and optionally a batch of actions, and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``pi`` N/A | Torch Distribution object, containing
| a batch of distributions describing
| the policy for the provided observations.
``logp_a`` (batch,) | Optional (only returned if batch of
| actions is given). Tensor containing
| the log probability, according to
| the policy, of the provided actions.
| If actions not given, will contain
| ``None``.
=========== ================ ======================================
The ``v`` module's forward call should accept a batch of observations
and return:
=========== ================ ======================================
Symbol Shape Description
=========== ================ ======================================
``v`` (batch,) | Tensor containing the value estimates
| for the provided observations. (Critical:
| make sure to flatten this!)
=========== ================ ======================================
ac_kwargs (dict): Any kwargs appropriate for the ActorCritic object
you provided to PPO.
seed (int): Seed for random number generators.
steps_per_epoch (int): Number of steps of interaction (state-action pairs)
for the agent and the environment in each epoch.
epochs (int): Number of epochs of interaction (equivalent to
number of policy updates) to perform.
gamma (float): Discount factor. (Always between 0 and 1.)
clip_ratio (float): Hyperparameter for clipping in the policy objective.
Roughly: how far can the new policy go from the old policy while
still profiting (improving the objective function)? The new policy
can still go farther than the clip_ratio says, but it doesn't help
on the objective anymore. (Usually small, 0.1 to 0.3.) Typically
denoted by :math:`\epsilon`.
pi_lr (float): Learning rate for policy optimizer.
vf_lr (float): Learning rate for value function optimizer.
train_pi_iters (int): Maximum number of gradient descent steps to take
on policy loss per epoch. (Early stopping may cause optimizer
to take fewer than this.)
train_v_iters (int): Number of gradient descent steps to take on
value function per epoch.
lam (float): Lambda for GAE-Lambda. (Always between 0 and 1,
close to 1.)
max_ep_len (int): Maximum length of trajectory / episode / rollout.
target_kl (float): Roughly what KL divergence we think is appropriate
between new and old policies after an update. This will get used
for early stopping. (Usually small, 0.01 or 0.05.)
logger_kwargs (dict): Keyword args for EpochLogger.
save_freq (int): How often (in terms of gap between epochs) to save
the current policy and value function.
"""
# GAedit
# Special function to avoid certain slowdowns from PyTorch + MPI combo.
# setup_pytorch_for_mpi()
# Set up logger and save configuration
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
# GAedit
# Seed
seed = 333
torch.manual_seed(seed)
np.random.seed(seed)
# Instantiate environment
env = env_fn()
#GAedit
# obs_dim = env.observation_space.shape
# act_dim = env.action_space.shape
# get the default brain
brain_name = env.brain_names[0]
brain = env.brains[brain_name]
# reset the environment
env_info = env.reset(train_mode=True)[brain_name]
# number of agents
num_agents = len(env_info.agents)
# size of each action
act_dim = brain.vector_action_space_size
# examine the state space
obs_dim = env_info.vector_observations.shape[1]
#GAedit
# Create actor-critic module
# ac = actor_critic(env.observation_space, env.action_space, **ac_kwargs)
ac = actor_critic(obs_dim, act_dim, **ac_kwargs)
# GAedit - don't think we need to sync
# Sync params across processes
# sync_params(ac)
# Count variables
var_counts = tuple(core.count_vars(module) for module in [ac.pi, ac.v])
logger.log('\nNumber of parameters: \t pi: %d, \t v: %d\n' % var_counts)
# Set up experience buffer
# GAedit
# local_steps_per_epoch = int(steps_per_epoch / num_procs())
local_steps_per_epoch = int(steps_per_epoch / num_agents)
#GAedit
buf = PPOBuffer(obs_dim, act_dim, local_steps_per_epoch * num_agents,
gamma, lam)
# buf = PPOBuffer(obs_dim, act_dim, local_steps_per_epoch, gamma, lam)
# Set up function for computing PPO policy loss
def compute_loss_pi(data):
obs, act, adv, logp_old = data['obs'], data['act'], data['adv'], data[
'logp']
# Policy loss
pi, logp = ac.pi(obs, act)
ratio = torch.exp(logp - logp_old)
clip_adv = torch.clamp(ratio, 1 - clip_ratio, 1 + clip_ratio) * adv
loss_pi = -(torch.min(ratio * adv, clip_adv)).mean()
# Useful extra info
approx_kl = (logp_old - logp).mean().item()
ent = pi.entropy().mean().item()
clipped = ratio.gt(1 + clip_ratio) | ratio.lt(1 - clip_ratio)
clipfrac = torch.as_tensor(clipped, dtype=torch.float32).mean().item()
pi_info = dict(kl=approx_kl, ent=ent, cf=clipfrac)
return loss_pi, pi_info
# Set up function for computing value loss
def compute_loss_v(data):
obs, ret = data['obs'], data['ret']
return ((ac.v(obs) - ret)**2).mean()
# Set up optimizers for policy and value function
pi_optimizer = Adam(ac.pi.parameters(), lr=pi_lr)
vf_optimizer = Adam(ac.v.parameters(), lr=vf_lr)
# Set up model saving
logger.setup_pytorch_saver(ac)
def update():
data = buf.get()
pi_l_old, pi_info_old = compute_loss_pi(data)
pi_l_old = pi_l_old.item()
v_l_old = compute_loss_v(data).item()
# Train policy with multiple steps of gradient descent
for i in range(train_pi_iters):
pi_optimizer.zero_grad()
loss_pi, pi_info = compute_loss_pi(data)
#GAedit
# kl = mpi_avg(pi_info['kl'])
kl = pi_info['kl']
if kl > 1.5 * target_kl:
logger.log(
'Early stopping at step %d due to reaching max kl.' % i)
break
loss_pi.backward()
#GAedit
# mpi_avg_grads(ac.pi) # average grads across MPI processes
# ac.pi.mean()
pi_optimizer.step()
logger.store(StopIter=i)
# Value function learning
for i in range(train_v_iters):
vf_optimizer.zero_grad()
loss_v = compute_loss_v(data)
loss_v.backward()
#GAedit
# mpi_avg_grads(ac.v) # average grads across MPI processes
vf_optimizer.step()
# Log changes from update
kl, ent, cf = pi_info['kl'], pi_info_old['ent'], pi_info['cf']
logger.store(LossPi=pi_l_old,
LossV=v_l_old,
KL=kl,
Entropy=ent,
ClipFrac=cf,
DeltaLossPi=(loss_pi.item() - pi_l_old),
DeltaLossV=(loss_v.item() - v_l_old))
# Prepare for interaction with environment
start_time = time.time()
#GAedit
# o, ep_ret, ep_len = env.reset(), 0, 0
ep_ret, ep_len = 0, 0
env_info = env.reset(train_mode=True)[brain_name]
o = env_info.vector_observations
# Main loop: collect experience in env and update/log each epoch
for epoch in range(epochs):
for t in range(local_steps_per_epoch):
a, v, logp = ac.step(torch.as_tensor(o, dtype=torch.float32))
# GAedit
# next_o, r, d, _ = env.step(a)
env_info = env.step(a)[brain_name]
next_o, r, d = env_info.vector_observations, env_info.rewards, env_info.local_done
#GAedit
# ep_ret += r
ep_ret += np.mean(r)
ep_len += 1
# save and log
#GAedit
# buf.store(o, a, r, v, logp)
for i in range(20):
buf.store(o[i], a[i], r[i], v[i], logp[i])
logger.store(VVals=v)
# Update obs (critical!)
o = next_o
timeout = ep_len == max_ep_len
# GAedit
# terminal = d or timeout
terminal = any(d) or timeout
epoch_ended = t == local_steps_per_epoch - 1
if terminal or epoch_ended:
if epoch_ended and not (terminal):
print('Warning: trajectory cut off by epoch at %d steps.' %
ep_len,
flush=True)
# if trajectory didn't reach terminal state, bootstrap value target
if timeout or epoch_ended:
_, v, _ = ac.step(torch.as_tensor(o, dtype=torch.float32))
else:
v = 0
buf.finish_path(v)
if terminal:
# only save EpRet / EpLen if trajectory finished
logger.store(EpRet=ep_ret, EpLen=ep_len)
# GAedit
# o, ep_ret, ep_len = env.reset(), 0, 0
ep_ret, ep_len = 0, 0
env_info = env.reset(train_mode=True)[brain_name]
o = env_info.vector_observations
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
# Perform PPO update!
update()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('TotalEnvInteracts', (epoch + 1) * steps_per_epoch)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('DeltaLossPi', average_only=True)
logger.log_tabular('DeltaLossV', average_only=True)
logger.log_tabular('Entropy', average_only=True)
logger.log_tabular('KL', average_only=True)
logger.log_tabular('ClipFrac', average_only=True)
logger.log_tabular('StopIter', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
env = make_env(util.ENV_CONFIG_DIR + env_config)
obs = []
actions = []
action_sign = np.array([-1, -1])
for i in range(iterations):
current_bound = initial_bound
o = env.reset()
real_action = env.action_space.default() * 0.5
for t in range(max_ep_len):
o, r, d, _ = env.step(real_action)
obs.append(o)
actions.append(real_action)
vp = o
vi = np.mean(obs[-5:])
vd = np.mean(np.diff(obs, axis=0)[-5:])
vd = 0 if np.isnan(vd) else vd
delta = np.exp((wp * vp + wi * vi + wd * vd) * action_sign)
delta = np.clip(delta, 1. / current_bound, current_bound)
#print(real_action, o, delta)
real_action = env.action_space.clip(real_action * delta)
current_bound = np.maximum(final_bound, current_bound * bound_decay)
print(np.mean(np.abs(obs[-20:])) * 100)
logger_kwargs = setup_logger_kwargs(exp_name,
seed,
data_dir=util.LOG_DIR +
os.path.splitext(env_config)[0])
logger = EpochLogger(**logger_kwargs)
#util.plot_seq_obs_and_actions(np.abs(obs), actions, env.action_space.high, logger.output_dir + '/actions.png')
def sac(args, steps_per_epoch=1500, replay_size=int(1e6), gamma=0.99,
polyak=0.995, lr=1e-3, alpha=3e-4, batch_size=128, start_steps=1000,
update_after=1000, update_every=1, num_test_episodes=10, max_ep_len=150,
logger_kwargs=dict(), save_freq=1):
logger_kwargs = setup_logger_kwargs(args.exp_name, args.seed)
torch.set_num_threads(torch.get_num_threads())
actor_critic = core.MLPActorCritic
ac_kwargs = dict(hidden_sizes=[args.hid] * args.l)
gamma = args.gamma
seed = args.seed
epochs = args.epochs
logger_tensor = Logger(logdir=args.logdir, run_name="{}-{}".format(args.model_name, time.ctime()))
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
torch.manual_seed(seed)
np.random.seed(seed)
env = ML1.get_train_tasks('reach-v1') # Create an environment with task `pick_place`
tasks = env.sample_tasks(1) # Sample a task (in this case, a goal variation)
env.set_task(tasks[0]) # Set task
test_env = ML1.get_train_tasks('reach-v1') # Create an environment with task `pick_place`
tasks = env.sample_tasks(1) # Sample a task (in this case, a goal variation)
test_env.set_task(tasks[0]) # Set task
obs_dim = env.observation_space.shape
act_dim = env.action_space.shape[0]
# Action limit for clamping: critically, assumes all dimensions share the same bound!
act_limit = env.action_space.high[0]
# Create actor-critic module and target networks
ac = actor_critic(env.observation_space, env.action_space, **ac_kwargs)
ac_targ = deepcopy(ac)
# Freeze target networks with respect to optimizers (only update via polyak averaging)
for p in ac_targ.parameters():
p.requires_grad = False
# List of parameters for both Q-networks (save this for convenience)
q_params = itertools.chain(ac.q1.parameters(), ac.q2.parameters())
# Experience buffer
replay_buffer = ReplayBuffer(obs_dim=obs_dim, act_dim=act_dim, size=replay_size)
# Count variables (protip: try to get a feel for how different size networks behave!)
var_counts = tuple(core.count_vars(module) for module in [ac.pi, ac.q1, ac.q2])
logger.log('\nNumber of parameters: \t pi: %d, \t q1: %d, \t q2: %d\n' % var_counts)
# Set up function for computing SAC Q-losses
def compute_loss_q(data):
o, a, r, o2, d = data['obs'], data['act'], data['rew'], data['obs2'], data['done']
q1 = ac.q1(o, a)
q2 = ac.q2(o, a)
# Bellman backup for Q functions
with torch.no_grad():
# Target actions come from *current* policy
a2, logp_a2 = ac.pi(o2)
# Target Q-values
q1_pi_targ = ac_targ.q1(o2, a2)
q2_pi_targ = ac_targ.q2(o2, a2)
q_pi_targ = torch.min(q1_pi_targ, q2_pi_targ)
backup = r + gamma * (1 - d) * (q_pi_targ - alpha * logp_a2)
# MSE loss against Bellman backup
loss_q1 = ((q1 - backup) ** 2).mean()
loss_q2 = ((q2 - backup) ** 2).mean()
loss_q = loss_q1 + loss_q2
# Useful info for logging
q_info = dict(Q1Vals=q1.detach().numpy(),
Q2Vals=q2.detach().numpy())
return loss_q, q_info
# Set up function for computing SAC pi loss
def compute_loss_pi(data):
o = data['obs']
pi, logp_pi = ac.pi(o)
q1_pi = ac.q1(o, pi)
q2_pi = ac.q2(o, pi)
q_pi = torch.min(q1_pi, q2_pi)
# Entropy-regularized policy loss
loss_pi = (alpha * logp_pi - q_pi).mean()
# Useful info for logging
pi_info = dict(LogPi=logp_pi.detach().numpy())
return loss_pi, pi_info
# Set up optimizers for policy and q-function
pi_optimizer = Adam(ac.pi.parameters(), lr=3e-4)
q_optimizer = Adam(q_params, lr=3e-4)
# Set up model saving
logger.setup_pytorch_saver(ac)
def update(data, logger_tensor, t):
# First run one gradient descent step for Q1 and Q2
q_optimizer.zero_grad()
loss_q, q_info = compute_loss_q(data)
loss_q.backward()
q_optimizer.step()
# Record things
logger.store(LossQ=loss_q.item(), **q_info)
logger_tensor.log_value(t, loss_q.item(), "loss q")
# Freeze Q-networks so you don't waste computational effort
# computing gradients for them during the policy learning step.
for p in q_params:
p.requires_grad = False
# Next run one gradient descent step for pi.
pi_optimizer.zero_grad()
loss_pi, pi_info = compute_loss_pi(data)
loss_pi.backward()
pi_optimizer.step()
# Unfreeze Q-networks so you can optimize it at next DDPG step.
for p in q_params:
p.requires_grad = True
# Record things
logger.store(LossPi=loss_pi.item(), **pi_info)
logger_tensor.log_value(t, loss_pi.item(), "loss pi")
# Finally, update target networks by polyak averaging.
with torch.no_grad():
for p, p_targ in zip(ac.parameters(), ac_targ.parameters()):
# NB: We use an in-place operations "mul_", "add_" to update target
# params, as opposed to "mul" and "add", which would make new tensors.
p_targ.data.mul_(polyak)
p_targ.data.add_((1 - polyak) * p.data)
def get_action(o, deterministic=False):
return ac.act(torch.as_tensor(o, dtype=torch.float32),
deterministic)
def test_agent():
for j in range(num_test_episodes):
o, d, ep_ret, ep_len = test_env.reset(), False, 0, 0
while not (d or (ep_len == max_ep_len)):
# Take deterministic actions at test time
o, r, d, _ = test_env.step(get_action(o, True))
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
logger_tensor.log_value(t, ep_ret, "test ep reward")
logger_tensor.log_value(t, ep_len, "test ep length")
# Prepare for interaction with environment
total_steps = steps_per_epoch * epochs
start_time = time.time()
o, ep_ret, ep_len = env.reset(), 0, 0
# Main loop: collect experience in env and update/log each epoch
for t in range(total_steps):
# Until start_steps have elapsed, randomly sample actions
# from a uniform distribution for better exploration. Afterwards,
# use the learned policy.
if t > start_steps:
a = get_action(o)
else:
a = env.action_space.sample()
# Step the env
o2, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
# Ignore the "done" signal if it comes from hitting the time
# horizon (that is, when it's an artificial terminal signal
# that isn't based on the agent's state)
d = False if ep_len == max_ep_len else d
# Store experience to replay buffer
replay_buffer.store(o, a, r, o2, d)
# Super critical, easy to overlook step: make sure to update
# most recent observation!
o = o2
# End of trajectory handling
if d or (ep_len == max_ep_len):
logger_tensor.log_value(t, ep_ret, "reward")
logging.info("> total_steps={} | reward={}".format(t, ep_ret))
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, ep_ret, ep_len = env.reset(), 0, 0
# Update handling
if t >= update_after and t % update_every == 0:
for j in range(update_every):
batch = replay_buffer.sample_batch(batch_size)
update(data=batch, logger_tensor = logger_tensor, t = t)
# End of epoch handling
if (t + 1) % steps_per_epoch == 0:
epoch = (t + 1) // steps_per_epoch
# Save model
if (epoch % save_freq == 0) or (epoch == epochs):
logger.save_state({'env': env}, None)
# Test the performance of the deterministic version of the agent.
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('Q1Vals', with_min_and_max=True)
logger.log_tabular('Q2Vals', with_min_and_max=True)
logger.log_tabular('LogPi', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger_tensor.log_value(t, epoch, "epoch")
logger.dump_tabular(logger_tensor=logger_tensor,epoch = epoch)
ac.save(args.save_model_dir, args.model_name)
q_target = q_target.detach()
# loss
loss = self.loss_function(q_eval, q_target)
logger.store(loss=loss)
# backprop loss
self.optimizer.zero_grad()
loss.backward()
self.optimizer.step()
return loss
dqn = DQN()
logdir = './DQN/%s' % args.games + '/%i' % int(time.time())
logger_kwargs = setup_logger_kwargs(args.games, args.seed, data_dir=logdir)
logger = EpochLogger(**logger_kwargs)
kwargs = {
'seed': args.seed,
'learning rate':args.lr,
}
logger.save_config(kwargs)
# model load with check
if LOAD and os.path.isfile(PRED_PATH) and os.path.isfile(TARGET_PATH):
dqn.load_model()
pkl_file = open(RESULT_PATH,'rb')
result = pickle.load(pkl_file)
pkl_file.close()
print('Load complete!')
else:
result = []
class gac_agent:
def __init__(self, args, env, test_env, env_params):
self.args = args
# path to save the model
if self.args.mmd:
self.exp_name = '_'.join(
(self.args.env_name, self.args.alg,
'mmd' + str(self.args.beta_mmd), 's' + str(self.args.seed),
datetime.now().isoformat()))
self.data_path = os.path.join(
self.args.save_dir, '_'.join(
(self.args.env_name, self.args.alg,
'mmd' + str(self.args.beta_mmd))), self.exp_name)
else:
self.exp_name = '_'.join(
(self.args.env_name, self.args.alg, str(self.args.seed),
datetime.now().isoformat()))
self.data_path = os.path.join(
self.args.save_dir, '_'.join(
(self.args.env_name, self.args.alg)), self.exp_name)
self.logger = EpochLogger(output_dir=self.data_path,
exp_name=self.exp_name)
self.logger.save_config(args)
self.env = env
self.test_env = test_env
self.env_params = env_params
# create the network
self.actor_network = actor(env_params)
self.critic_network1 = critic(env_params)
self.critic_network2 = critic(env_params)
self.advice_network1 = critic(env_params)
self.advice_network2 = critic(env_params)
# sync the networks across the cpus
sync_networks(self.actor_network)
sync_networks(self.critic_network1)
sync_networks(self.critic_network2)
sync_networks(self.advice_network1)
sync_networks(self.advice_network2)
# build up the target network
# self.actor_target_network = actor(env_params)
self.critic_target_network1 = critic(env_params)
self.critic_target_network2 = critic(env_params)
self.advice_target_network1 = critic(env_params)
self.advice_target_network2 = critic(env_params)
# load the weights into the target networks
# self.actor_target_network.load_state_dict(self.actor_network.state_dict())
self.critic_target_network1.load_state_dict(
self.critic_network1.state_dict())
self.critic_target_network2.load_state_dict(
self.critic_network2.state_dict())
self.advice_target_network1.load_state_dict(
self.advice_network1.state_dict())
self.advice_target_network2.load_state_dict(
self.advice_network2.state_dict())
# if use gpu
self.rank = MPI.COMM_WORLD.Get_rank()
self.mpi_size = MPI.COMM_WORLD.Get_size()
if args.cuda:
device = 'cuda:{}'.format(self.rank % torch.cuda.device_count())
self.device = torch.device(device)
if self.args.cuda:
self.actor_network.cuda(self.device)
self.critic_network1.cuda(self.device)
self.critic_network2.cuda(self.device)
# self.actor_target_network.cuda(self.device)
self.critic_target_network1.cuda(self.device)
self.critic_target_network2.cuda(self.device)
self.advice_network1.cuda(self.device)
self.advice_network2.cuda(self.device)
self.advice_target_network1.cuda(self.device)
self.advice_target_network2.cuda(self.device)
# create the optimizer
self.actor_optim = torch.optim.Adam(self.actor_network.parameters(),
lr=self.args.lr_actor)
self.critic_optim1 = torch.optim.Adam(
self.critic_network1.parameters(), lr=self.args.lr_critic)
self.critic_optim2 = torch.optim.Adam(
self.critic_network2.parameters(), lr=self.args.lr_critic)
self.advice_optim1 = torch.optim.Adam(
self.advice_network1.parameters(), lr=self.args.lr_critic)
self.advice_optim2 = torch.optim.Adam(
self.advice_network2.parameters(), lr=self.args.lr_critic)
# create the replay buffer
self.buffer = ReplayBuffer(self.env_params['obs'],
self.env_params['action'],
self.args.buffer_size)
self.logger.setup_pytorch_saver(self.actor_network)
self.obs_mean, self.obs_std = self.buffer.obs_mean, self.buffer.obs_std
def learn(self):
"""
train the network
"""
# start to collect samples
obs, ep_rew, ep_cost, ep_len, done = self.env.reset(), 0, 0, 0, False
for epoch in range(self.args.n_epochs):
for _ in range(self.args.n_train_rollouts):
for t in range(self.env_params['max_timesteps']):
with torch.no_grad():
input_tensor = self._preproc_inputs(obs)
action = self.actor_network(input_tensor)
action = action.detach().cpu().numpy().squeeze()
# feed the actions into the environment
next_obs, reward, done, info = self.env.step(
action * self.env_params['action_max'])
ep_rew += reward
ep_cost += info['cost']
ep_len += 1
self.buffer.store(obs, action, reward, info['cost'],
next_obs, done)
obs = next_obs
if done or (ep_len == self.env_params['max_timesteps']
) or (t % self.args.n_batches == 0):
self.buffer.obs_mean = MPI.COMM_WORLD.allreduce(
self.buffer.obs_mean, op=MPI.SUM) / self.mpi_size
self.buffer.obs_std = MPI.COMM_WORLD.allreduce(
self.buffer.obs_std, op=MPI.SUM) / self.mpi_size
self.obs_mean, self.obs_std = self.buffer.obs_mean, self.buffer.obs_std
self.buffer.rew_mean = MPI.COMM_WORLD.allreduce(
self.buffer.rew_mean, op=MPI.SUM) / self.mpi_size
self.buffer.rew_std = MPI.COMM_WORLD.allreduce(
self.buffer.rew_std, op=MPI.SUM) / self.mpi_size
self.buffer.cost_mean = MPI.COMM_WORLD.allreduce(
self.buffer.cost_mean, op=MPI.SUM) / self.mpi_size
self.buffer.cost_std = MPI.COMM_WORLD.allreduce(
self.buffer.cost_std, op=MPI.SUM) / self.mpi_size
for _ in range(self.args.n_batches):
# train the network
self._update_network()
# soft update
# self._soft_update_target_network(self.actor_target_network, self.actor_network)
self._soft_update_target_network(
self.critic_target_network1,
self.critic_network1, self.args.polyak)
self._soft_update_target_network(
self.critic_target_network2,
self.critic_network2, self.args.polyak)
if done or (ep_len == self.env_params['max_timesteps']):
self.logger.store(EpReward=ep_rew,
EpCost=ep_cost,
EpLen=ep_len)
obs, ep_rew, ep_cost, ep_len, done = self.env.reset(
), 0, 0, 0, False
# start to do the evaluation
self._test_policy()
# save some necessary objects
state = {
'observation_mean': self.buffer.obs_mean,
'observation_std': self.buffer.obs_std
}
self.logger.save_state(state, None)
t = ((epoch + 1) * self.mpi_size *
self.env_params['max_timesteps']) * self.args.n_train_rollouts
self.logger.log_tabular('Epoch', epoch + 1)
self.logger.log_tabular('EpReward', with_min_and_max=True)
self.logger.log_tabular('EpCost', with_min_and_max=True)
self.logger.log_tabular('EpLen', average_only=True)
self.logger.log_tabular('TestReward', with_min_and_max=True)
self.logger.log_tabular('TestCost', with_min_and_max=True)
self.logger.log_tabular('TestLen', average_only=True)
self.logger.log_tabular('LossPi', average_only=True)
self.logger.log_tabular('LossQ', average_only=True)
self.logger.log_tabular('MMDEntropy', average_only=True)
self.logger.log_tabular('TotalEnvInteracts', t)
self.logger.dump_tabular()
if MPI.COMM_WORLD.Get_rank() == 0:
print("obs_mean=", self.buffer.obs_mean)
print("obs_std=", self.buffer.obs_std)
print("reward_mean=", self.buffer.rew_mean)
print("reward_std=", self.buffer.rew_std)
print("cost_mean=", self.buffer.cost_mean)
print("cost_std=", self.buffer.cost_std)
# pre_process the inputs
def _preproc_inputs(self, obs):
inputs = ((np.array(obs) - self.obs_mean) /
(self.obs_std + 1e-8)).clip(-self.args.clip_range,
self.args.clip_range)
inputs = torch.tensor(inputs, dtype=torch.float32).unsqueeze(0)
if self.args.cuda:
inputs = inputs.cuda(self.device)
return inputs
# soft update
def _soft_update_target_network(self, target, source, polyak):
for target_param, param in zip(target.parameters(),
source.parameters()):
target_param.data.copy_((1 - polyak) * param.data +
polyak * target_param.data)
# update the network
def _update_network(self):
# sample the episodes
batches = self.buffer.sample(self.args.batch_size)
o = torch.FloatTensor(batches['obs']).to(self.device)
o2 = torch.FloatTensor(batches['obs2']).to(self.device)
a = torch.FloatTensor(batches['act']).to(self.device)
r = torch.FloatTensor(batches['rew']).to(self.device)
c = torch.FloatTensor(batches['cost']).to(self.device)
d = torch.FloatTensor(batches['done']).to(self.device)
# calculate the target Q value function
with torch.no_grad():
# do the normalization
# concatenate the stuffs
a2 = self.actor_network(o2)
q_next_value1 = self.critic_target_network1(o2, a2).detach()
q_next_value2 = self.critic_target_network2(o2, a2).detach()
target_q_value = r + self.args.gamma * (1 - d) * torch.min(
q_next_value1, q_next_value2)
target_q_value = target_q_value.detach()
p_next_value1 = self.advice_target_network1(o2, a2).detach()
p_next_value2 = self.advice_target_network2(o2, a2).detach()
target_p_value = -c + self.args.gamma * (1 - d) * torch.min(
p_next_value1, p_next_value2)
target_p_value = target_p_value.detach()
# the q loss
real_q_value1 = self.critic_network1(o, a)
real_q_value2 = self.critic_network2(o, a)
critic_loss1 = (target_q_value - real_q_value1).pow(2).mean()
critic_loss2 = (target_q_value - real_q_value2).pow(2).mean()
# the p loss
real_p_value1 = self.advice_network1(o, a)
real_p_value2 = self.advice_network2(o, a)
advice_loss1 = (target_p_value - real_p_value1).pow(2).mean()
advice_loss2 = (target_p_value - real_p_value2).pow(2).mean()
# the actor loss
o_exp = o.repeat(self.args.expand_batch, 1)
a_exp = self.actor_network(o_exp)
actor_loss = -torch.min(self.critic_network1(o_exp, a_exp),
self.critic_network2(o_exp, a_exp)).mean()
actor_loss -= self.args.advice * torch.min(
self.advice_network1(o_exp, a_exp),
self.advice_network2(o_exp, a_exp)).mean()
mmd_entropy = torch.tensor(0.0)
if self.args.mmd:
# mmd is computationally expensive
a_exp_reshape = a_exp.view(self.args.expand_batch, -1,
a_exp.shape[-1]).transpose(0, 1)
with torch.no_grad():
uniform_actions = (2 * torch.rand_like(a_exp_reshape) - 1)
mmd_entropy = mmd(a_exp_reshape, uniform_actions)
if self.args.beta_mmd <= 0.0:
mmd_entropy.detach_()
else:
actor_loss += self.args.beta_mmd * mmd_entropy
# start to update the network
self.actor_optim.zero_grad()
actor_loss.backward()
sync_grads(self.actor_network)
self.actor_optim.step()
# update the critic_network
self.critic_optim1.zero_grad()
critic_loss1.backward()
sync_grads(self.critic_network1)
self.critic_optim1.step()
self.critic_optim2.zero_grad()
critic_loss2.backward()
sync_grads(self.critic_network2)
self.critic_optim2.step()
self.logger.store(LossPi=actor_loss.detach().cpu().numpy())
self.logger.store(LossQ=(critic_loss1 +
critic_loss2).detach().cpu().numpy())
self.logger.store(MMDEntropy=mmd_entropy.detach().cpu().numpy())
# do the evaluation
def _test_policy(self):
for _ in range(self.args.n_test_rollouts):
obs, ep_rew, ep_cost, ep_len, done = self.test_env.reset(
), 0, 0, 0, False
while (not done and ep_len < self.env_params['max_timesteps']):
with torch.no_grad():
input_tensor = self._preproc_inputs(obs)
action = self.actor_network(input_tensor, std=0.5)
action = action.detach().cpu().numpy().squeeze()
obs_next, reward, done, info = self.test_env.step(action)
obs = obs_next
ep_rew += reward
ep_cost += info['cost']
ep_len += 1
self.logger.store(TestReward=ep_rew,
TestCost=ep_cost,
TestLen=ep_len)
