class PPO_flat(BatchPolopt):
"""
Normal clipped PPO version of the HiPPO one that this paper investigates.
"""
# double check this constructor later
def __init__(self,
optimizer=None,
optimizer_args=None,
step_size=0.0003,
truncate_local_is_ratio=None,
epsilon=0.1,
train_pi_iters=80,
**kwargs):
if optimizer is None:
if optimizer_args is None:
optimizer_args = dict(batch_size=None)
self.optimizer = FirstOrderOptimizer(learning_rate=step_size, max_epochs=train_pi_iters,
**optimizer_args)
self.step_size = step_size
self.truncate_local_is_ratio = truncate_local_is_ratio
self.epsilon = epsilon
super(PPO_flat, self).__init__(**kwargs) # not sure if this line is correct
# i hope this is right
self.debug_fns = []
# self.old_policy = copy.deepcopy(self.policy)
# initialize the computation graph
# optimize is run on >= 1 trajectory at a time
def init_opt(self):
obs_var = self.env.observation_space.new_tensor_variable(
'obs',
extra_dims=1,
)
action_var = self.env.action_space.new_tensor_variable(
'action',
extra_dims=1,
)
advantage_var = ext.new_tensor(
'advantage',
ndim=1,
dtype=theano.config.floatX
)
mean_var = ext.new_tensor(
'mean',
ndim=2,
dtype=theano.config.floatX
)
log_std_var = ext.new_tensor(
'log_std',
ndim=2,
dtype=theano.config.floatX
)
old_dist_info_vars = dict(mean=mean_var, log_std=log_std_var)
dist_info_vars = self.policy.dist_info_sym(obs_var)
lr = self.policy.distribution.likelihood_ratio_sym(action_var, old_dist_info_vars, dist_info_vars)
surr_loss_vector = TT.minimum(lr * advantage_var,
TT.clip(lr, 1 - self.epsilon, 1 + self.epsilon) * advantage_var)
surr_loss = -TT.mean(surr_loss_vector)
input_list = [obs_var, action_var, advantage_var, mean_var, log_std_var]
self.optimizer.update_opt(
loss=surr_loss,
target=self.policy,
inputs=input_list
)
return dict()
# do the optimization
def optimize_policy(self, itr, samples_data):
# note that I have to do extra preprocessing to the advantages, and also create obs_var_sparse
input_values = tuple(ext.extract(
samples_data,
"observations", "actions", "advantages", "agent_infos"
))
mean = input_values[3]['mean']
log_std = input_values[3]['log_std']
all_input_values = (input_values[0], input_values[1], input_values[2], mean, log_std)
# todo: assign current parameters to old policy; does this work?
# old_param_values = self.policy.get_param_values()
# self.old_policy.set_param_values(old_param_values)
loss_before = self.optimizer.loss(all_input_values)
self.optimizer.optimize(all_input_values)
loss_after = self.optimizer.loss(all_input_values)
logger.record_tabular('LossBefore', loss_before)
logger.record_tabular('LossAfter', loss_after)
logger.record_tabular('dLoss', loss_before - loss_after)
return dict()
def get_itr_snapshot(self, itr, samples_data):
return dict(
itr=itr,
policy=self.policy,
baseline=self.baseline,
env=self.env
)
def log_diagnostics(self, paths):
# paths obtained by self.sampler.obtain_samples
BatchPolopt.log_diagnostics(self, paths)
class PG_concurrent(BatchPolopt):
"""
Designed to enable concurrent training of a SNN that parameterizes skills
and also train the manager at the same time
Note that, if I'm not trying to do the sample approximation of the weird log of sum term,
I don't need to know which skill was picked, just need to know the action
"""
# double check this constructor later
def __init__(
self,
manager_optimizer=None,
optimizer=None,
snn_optimizer=None,
optimizer_args=None,
step_size=1e-6,
latents=None, # some sort of iterable of the actual latent vectors
period=10, # how often I choose a latent
truncate_local_is_ratio=None,
**kwargs):
if optimizer is None:
if optimizer_args is None:
# optimizer_args = dict()
optimizer_args = dict(batch_size=None)
self.optimizer = FirstOrderOptimizer(
learning_rate=step_size,
**optimizer_args) # I hope this is right
self.manager_optimizer = manager_optimizer
self.snn_optimizer = snn_optimizer
self.step_size = step_size
self.truncate_local_is_ratio = truncate_local_is_ratio
super(PG_concurrent,
self).__init__(**kwargs) # not sure if this line is correct
self.latents = latents
self.period = period
# todo: fix this sampler stuff
self.sampler = HierBatchSampler(self, self.period)
# i hope this is right
self.diagonal = DiagonalGaussian(
self.policy.low_policy.action_space.flat_dim)
self.debug_fns = []
# initialize the computation graph
# optimize is run on >= 1 trajectory at a time
def init_opt(self):
# obs_var_raw = self.env.observation_space.new_tensor_variable(
# 'obs',
# extra_dims=1,
# )
obs_var_raw = ext.new_tensor(
'obs', ndim=3, dtype=theano.config.floatX) # todo: check the dtype
action_var = self.env.action_space.new_tensor_variable(
'action',
extra_dims=1,
)
# this will have to be the advantage every self.period timesteps
advantage_var = ext.new_tensor('advantage',
ndim=1,
dtype=theano.config.floatX)
obs_var_sparse = ext.new_tensor(
'sparse_obs',
ndim=2,
dtype=theano.config.
floatX # todo: check this with carlos, refer to discrete.py in rllab.spaces
)
assert isinstance(self.policy, HierarchicalPolicy)
# todo: assumptions: 1 trajectory, which is a multiple of p; that the obs_var_probs is valid
# undoing the reshape, so that batch sampling is ok
obs_var = TT.reshape(obs_var_raw, [
obs_var_raw.shape[0] * obs_var_raw.shape[1], obs_var_raw.shape[2]
])
# obs_var = obs_var_raw
# i, j should contain the probability of latent j at time step self.period*i
# should be a len(obs)//self.period by len(self.latent) tensor
latent_probs = self.policy.manager.dist_info_sym(
obs_var_sparse)['prob']
# get the distribution parameters
# dist_info_vars = []
# for latent in self.latents:
# self.policy.low_policy.set_latent_train(latent)
# dist_info_vars.append(self.policy.low_policy.dist_info_sym(obs_var))
# hopefully the above line takes multiple samples, and state_info_vars not needed as input
dist_info_vars = self.policy.low_policy.dist_info_sym_all_latents(
obs_var)
probs = [
TT.exp(self.diagonal.log_likelihood_sym(action_var, dist_info))
for dist_info in dist_info_vars
]
# need to reshape at the end
reshaped_probs = [
TT.reshape(prob, [obs_var.shape[0] // self.period, self.period])
for prob in probs
]
# now, multiply out each row and concatenate
subtrajectory_probs = TT.stack([
TT.prod(reshaped_prob, axis=1) for reshaped_prob in reshaped_probs
],
axis=1)
# shape error might come out of here
# elementwise multiplication, then sum up each individual row and take log
likelihood = TT.log(TT.sum(subtrajectory_probs * latent_probs, axis=1))
surr_loss = -TT.mean(likelihood * advantage_var)
input_list = [obs_var_raw, obs_var_sparse, action_var, advantage_var]
# npo has state_info_vars and old_dist_info_vars, I don't think I need them until I go for NPO/TRPO
self.optimizer.update_opt(loss=surr_loss,
target=self.policy,
inputs=input_list)
return dict()
#do the optimization
def optimize_policy(self, itr, samples_data):
assert len(samples_data) // self.period == 0
# note that I have to do extra preprocessing to the advantages, and also create obs_var_sparse
input_values = tuple(
ext.extract(samples_data, "observations", "actions", "advantages"))
# print(input_values[0].shape)
obs_raw = input_values[0].reshape(
input_values[0].shape[0] // self.period, self.period,
input_values[0].shape[1])
# obs_raw = input_values[0]
obs_sparse = input_values[0].take(
[i for i in range(0, input_values[0].shape[0], self.period)],
axis=0)
advantage_sparse = np.sum(input_values[2].reshape(
[input_values[2].shape[0] // self.period, self.period]),
axis=1)
all_input_values = (obs_raw, obs_sparse, input_values[1],
advantage_sparse)
loss_before = self.optimizer.loss(all_input_values)
self.optimizer.optimize(all_input_values)
loss_after = self.optimizer.loss(all_input_values)
logger.record_tabular('LossBefore', loss_before)
logger.record_tabular('LossAfter', loss_after)
logger.record_tabular('dLoss', loss_before - loss_after)
return dict()
def optimize_manager(self, itr, samples_data):
pass
def optimize_snn(self, itr, samples_data):
pass
def get_itr_snapshot(self, itr, samples_data):
return dict(itr=itr,
policy=self.policy,
baseline=self.baseline,
env=self.env)
def log_diagnostics(self, paths):
#paths obtained by self.sampler.obtain_samples
BatchPolopt.log_diagnostics(self, paths)
class Concurrent_PPO(BatchPolopt):
"""
Designed to enable concurrent training of a SNN that parameterizes skills
and also train the manager at the same time
Note that, if I'm not trying to do the sample approximation of the weird log of sum term,
I don't need to know which skill was picked, just need to know the action
"""
# double check this constructor later
def __init__(self,
optimizer=None,
optimizer_args=None,
step_size=0.0003,
num_latents=6,
latents=None, # some sort of iterable of the actual latent vectors
period=10, # how often I choose a latent
truncate_local_is_ratio=None,
epsilon=0.1,
train_pi_iters=80,
use_skill_dependent_baseline=False,
**kwargs):
if optimizer is None:
if optimizer_args is None:
# optimizer_args = dict()
optimizer_args = dict(batch_size=None)
self.optimizer = FirstOrderOptimizer(learning_rate=step_size, max_epochs=train_pi_iters, **optimizer_args)
self.step_size = step_size
self.truncate_local_is_ratio = truncate_local_is_ratio
self.epsilon = epsilon
super(Concurrent_PPO, self).__init__(**kwargs) # not sure if this line is correct
self.num_latents = kwargs['policy'].latent_dim
self.latents = latents
self.period = period
# todo: fix this sampler stuff
# import pdb; pdb.set_trace()
self.sampler = HierBatchSampler(self, self.period)
# self.sampler = BatchSampler(self)
# i hope this is right
self.diagonal = DiagonalGaussian(self.policy.low_policy.action_space.flat_dim)
self.debug_fns = []
assert isinstance(self.policy, HierarchicalPolicy)
if self.policy is not None:
self.period = self.policy.period
assert self.policy.period == self.period
self.old_policy = copy.deepcopy(self.policy)
# skill dependent baseline
self.use_skill_dependent_baseline = use_skill_dependent_baseline
if use_skill_dependent_baseline:
curr_env = kwargs['env']
skill_dependent_action_space = curr_env.action_space
skill_dependent_obs_space_dim = ((curr_env.observation_space.shape[0] + 1) * self.num_latents,)
skill_dependent_obs_space = Box(-1.0, 1.0, shape=skill_dependent_obs_space_dim)
skill_depdendent_env_spec = EnvSpec(skill_dependent_obs_space, skill_dependent_action_space)
self.skill_dependent_baseline = LinearFeatureBaseline(env_spec=skill_depdendent_env_spec)
# initialize the computation graph
# optimize is run on >= 1 trajectory at a time
def init_opt(self):
# obs_var_raw = self.env.observation_space.new_tensor_variable(
# 'obs',
# extra_dims=1,
# )
obs_var_raw = ext.new_tensor('obs', ndim=3, dtype=theano.config.floatX) # todo: check the dtype
action_var = self.env.action_space.new_tensor_variable(
'action',
extra_dims=1,
)
# this will have to be the advantage every self.period timesteps
advantage_var_sparse = ext.new_tensor(
'sparse_advantage',
ndim=1,
dtype=theano.config.floatX
)
advantage_var = ext.new_tensor(
'advantage',
ndim=1,
dtype=theano.config.floatX
)
obs_var_sparse = ext.new_tensor(
'sparse_obs',
ndim=2,
dtype=theano.config.floatX # todo: check this with carlos, refer to discrete.py in rllab.spaces
)
latent_var_sparse = ext.new_tensor(
'sparse_latent',
ndim=2,
dtype=theano.config.floatX
)
latent_var = ext.new_tensor(
'latents',
ndim=2,
dtype=theano.config.floatX
)
assert isinstance(self.policy, HierarchicalPolicy)
# todo: assumptions: 1 trajectory, which is a multiple of p; that the obs_var_probs is valid
# undoing the reshape, so that batch sampling is ok
obs_var = TT.reshape(obs_var_raw, [obs_var_raw.shape[0] * obs_var_raw.shape[1], obs_var_raw.shape[2]])
# obs_var = obs_var_raw
#############################################################
### calculating the manager portion of the surrogate loss ###
#############################################################
# i, j should contain the probability of latent j at time step self.period*i
# should be a len(obs)//self.period by len(self.latent) tensor
latent_probs = self.policy.manager.dist_info_sym(obs_var_sparse)['prob']
old_latent_probs = self.old_policy.manager.dist_info_sym(obs_var_sparse)['prob']
actual_latent_probs = TT.sum(latent_probs * latent_var_sparse, axis=1)
old_actual_latent_probs = TT.sum(old_latent_probs * latent_var_sparse, axis=1)
lr = actual_latent_probs / old_actual_latent_probs
manager_surr_loss_vector = TT.minimum(lr * advantage_var_sparse,
TT.clip(lr, 1 - self.epsilon, 1 + self.epsilon) * advantage_var_sparse)
manager_surr_loss = -TT.mean(manager_surr_loss_vector)
# manager_surr_loss = - TT.mean(TT.log(actual_latent_probs) * advantage_var_sparse)
############################################################
### calculating the skills portion of the surrogate loss ###
############################################################
# get the distribution parameters
# dist_info_vars = []
# for latent in self.latents:
# self.policy.low_policy.set_latent_train(latent)
# dist_info_vars.append(self.policy.low_policy.dist_info_sym(obs_var))
# hopefully the above line takes multiple samples, and state_info_vars not needed as input
dist_info_vars = self.policy.low_policy.dist_info_sym_all_latents(obs_var)
probs = TT.stack([self.diagonal.log_likelihood_sym(action_var, dist_info) for dist_info in dist_info_vars],
axis=1)
actual_action_log_probs = TT.sum(probs * latent_var, axis=1) # todo: verify that dist_info_vars is in order
# old policy stuff
old_dist_info_vars = self.old_policy.low_policy.dist_info_sym_all_latents(obs_var)
old_probs = TT.stack([self.diagonal.log_likelihood_sym(action_var, dist_info) for dist_info in old_dist_info_vars],
axis=1)
old_actual_action_log_probs = TT.sum(old_probs * latent_var, axis=1)
skill_lr = TT.exp(actual_action_log_probs - old_actual_action_log_probs)
skill_surr_loss_vector = TT.minimum(skill_lr * advantage_var,
TT.clip(skill_lr, 1 - self.epsilon, 1 + self.epsilon) * advantage_var)
skill_surr_loss = -TT.mean(skill_surr_loss_vector)
# skill_surr_loss = - TT.mean(actual_action_log_probs*advantage_var)
surr_loss = manager_surr_loss/self.period + skill_surr_loss # so that the relative magnitudes are correct
input_list = [obs_var_raw, obs_var_sparse, action_var, advantage_var, advantage_var_sparse, latent_var,
latent_var_sparse]
# input_list = [obs_var_raw, obs_var_sparse, action_var, advantage_var]
# npo has state_info_vars and old_dist_info_vars, I don't think I need them until I go for NPO/TRPO
self.optimizer.update_opt(
loss=surr_loss,
target=self.policy,
inputs=input_list
)
return dict()
# do the optimization
def optimize_policy(self, itr, samples_data):
print(len(samples_data['observations']), self.period)
assert len(samples_data['observations']) % self.period == 0
# note that I have to do extra preprocessing to the advantages, and also create obs_var_sparse
if self.use_skill_dependent_baseline:
input_values = tuple(ext.extract(
samples_data,
"observations", "actions", "advantages", "agent_infos", "skill_advantages"
))
else:
input_values = tuple(ext.extract(
samples_data,
"observations", "actions", "advantages", "agent_infos"
))
obs_raw = input_values[0].reshape(input_values[0].shape[0] // self.period, self.period,
input_values[0].shape[1])
obs_sparse = input_values[0].take([i for i in range(0, input_values[0].shape[0], self.period)], axis=0)
advantage_sparse = input_values[2].reshape([input_values[2].shape[0] // self.period, self.period])[:, 0]
latents = input_values[3]['latents']
latents_sparse = latents.take([i for i in range(0, latents.shape[0], self.period)], axis=0)
if self.use_skill_dependent_baseline:
all_input_values = (
obs_raw, obs_sparse, input_values[1], input_values[4], advantage_sparse, latents, latents_sparse)
else:
all_input_values = (
obs_raw, obs_sparse, input_values[1], input_values[2], advantage_sparse, latents, latents_sparse)
# todo: assign current parameters to old policy; does this work?
old_param_values = self.policy.get_param_values(trainable=True)
self.old_policy.set_param_values(old_param_values, trainable=True)
loss_before = self.optimizer.loss(all_input_values)
self.optimizer.optimize(all_input_values)
loss_after = self.optimizer.loss(all_input_values)
logger.record_tabular('LossBefore', loss_before)
logger.record_tabular('LossAfter', loss_after)
logger.record_tabular('dLoss', loss_before - loss_after)
return dict()
def get_itr_snapshot(self, itr, samples_data):
return dict(
itr=itr,
policy=self.policy,
baseline=self.baseline,
env=self.env
)
def log_diagnostics(self, paths):
# paths obtained by self.sampler.obtain_samples
BatchPolopt.log_diagnostics(self, paths)
class Hippo(BatchPolopt):
def __init__(
self,
optimizer=None,
optimizer_args=None,
step_size=0.0003,
latents=None, # some sort of iterable of the actual latent vectors
average_period=10, # average over all the periods
truncate_local_is_ratio=None,
epsilon=0.1,
train_pi_iters=80,
use_skill_dependent_baseline=False,
mlp_skill_dependent_baseline=False,
**kwargs):
if optimizer is None:
if optimizer_args is None:
# optimizer_args = dict()
optimizer_args = dict(batch_size=None)
self.optimizer = FirstOrderOptimizer(learning_rate=step_size,
max_epochs=train_pi_iters,
**optimizer_args)
self.step_size = step_size
self.truncate_local_is_ratio = truncate_local_is_ratio
self.epsilon = epsilon
super(Hippo,
self).__init__(**kwargs) # not sure if this line is correct
self.num_latents = kwargs['policy'].latent_dim
self.latents = latents
self.average_period = average_period
# import pdb; pdb.set_trace()
# self.sampler = BatchSampler(self)
self.sampler = HierBatchSampler(self, period=None)
# i hope this is right
self.diagonal = DiagonalGaussian(
self.policy.low_policy.action_space.flat_dim)
self.debug_fns = []
assert isinstance(self.policy, HierarchicalPolicyRandomTime)
# self.old_policy = copy.deepcopy(self.policy)
# skill dependent baseline
self.use_skill_dependent_baseline = use_skill_dependent_baseline
self.mlp_skill_dependent_baseline = mlp_skill_dependent_baseline
if use_skill_dependent_baseline:
curr_env = kwargs['env']
skill_dependent_action_space = curr_env.action_space
new_obs_space_no_bi = curr_env.observation_space.shape[
0] + 1 # 1 for the t_remaining
skill_dependent_obs_space_dim = (new_obs_space_no_bi *
(self.num_latents + 1) +
self.num_latents, )
skill_dependent_obs_space = Box(
-1.0, 1.0, shape=skill_dependent_obs_space_dim)
skill_dependent_env_spec = EnvSpec(skill_dependent_obs_space,
skill_dependent_action_space)
if self.mlp_skill_dependent_baseline:
self.skill_dependent_baseline = GaussianMLPBaseline(
env_spec=skill_dependent_env_spec)
else:
self.skill_dependent_baseline = LinearFeatureBaseline(
env_spec=skill_dependent_env_spec)
def init_opt(self):
obs_var = ext.new_tensor(
'obs', ndim=2, dtype=theano.config.floatX) # todo: check the dtype
manager_obs_var = ext.new_tensor('manager_obs',
ndim=2,
dtype=theano.config.floatX)
action_var = self.env.action_space.new_tensor_variable(
'action',
extra_dims=1,
)
# this will have to be the advantage every time the manager makes a decision
manager_advantage_var = ext.new_tensor('manager_advantage',
ndim=1,
dtype=theano.config.floatX)
skill_advantage_var = ext.new_tensor('skill_advantage',
ndim=1,
dtype=theano.config.floatX)
latent_var_sparse = ext.new_tensor('sparse_latent',
ndim=2,
dtype=theano.config.floatX)
latent_var = ext.new_tensor('latents',
ndim=2,
dtype=theano.config.floatX)
mean_var = ext.new_tensor('mean', ndim=2, dtype=theano.config.floatX)
log_std_var = ext.new_tensor('log_std',
ndim=2,
dtype=theano.config.floatX)
manager_prob_var = ext.new_tensor('log_std',
ndim=2,
dtype=theano.config.floatX)
assert isinstance(self.policy, HierarchicalPolicy)
#############################################################
### calculating the manager portion of the surrogate loss ###
#############################################################
# i, j should contain the probability of latent j at time step self.period*i
# should be a len(obs)//self.period by len(self.latent) tensor
latent_probs = self.policy.manager.dist_info_sym(
manager_obs_var)['prob']
# old_latent_probs = self.old_policy.manager.dist_info_sym(manager_obs_var)['prob']
actual_latent_probs = TT.sum(latent_probs * latent_var_sparse, axis=1)
old_actual_latent_probs = TT.sum(manager_prob_var * latent_var_sparse,
axis=1)
lr = TT.exp(
TT.log(actual_latent_probs) - TT.log(old_actual_latent_probs))
manager_surr_loss_vector = TT.minimum(
lr * manager_advantage_var,
TT.clip(lr, 1 - self.epsilon, 1 + self.epsilon) *
manager_advantage_var)
manager_surr_loss = -TT.mean(manager_surr_loss_vector)
############################################################
### calculating the skills portion of the surrogate loss ###
############################################################
dist_info_var = self.policy.low_policy.dist_info_sym(
obs_var, state_info_var=latent_var)
old_dist_info_var = dict(mean=mean_var, log_std=log_std_var)
skill_lr = self.diagonal.likelihood_ratio_sym(action_var,
old_dist_info_var,
dist_info_var)
skill_surr_loss_vector = TT.minimum(
skill_lr * skill_advantage_var,
TT.clip(skill_lr, 1 - self.epsilon, 1 + self.epsilon) *
skill_advantage_var)
skill_surr_loss = -TT.mean(skill_surr_loss_vector)
surr_loss = manager_surr_loss / self.average_period + skill_surr_loss
input_list = [
obs_var, manager_obs_var, action_var, manager_advantage_var,
skill_advantage_var, latent_var, latent_var_sparse, mean_var,
log_std_var, manager_prob_var
]
self.optimizer.update_opt(loss=surr_loss,
target=self.policy,
inputs=input_list)
return dict()
# do the optimization
def optimize_policy(self, itr, samples_data):
# print(len(samples_data['observations']), self.period)
# assert len(samples_data['observations']) % self.period == 0
# note that I have to do extra preprocessing to the advantages, and also create obs_var_sparse
if self.use_skill_dependent_baseline:
input_values = tuple(
ext.extract(samples_data, "observations", "actions",
"advantages", "agent_infos", "skill_advantages"))
else:
input_values = tuple(
ext.extract(samples_data, "observations", "actions",
"advantages", "agent_infos"))
time_remaining = input_values[3]['time_remaining']
resampled_period = input_values[3]['resampled_period']
obs_var = np.insert(input_values[0],
self.policy.obs_robot_dim,
time_remaining,
axis=1)
manager_obs_var = obs_var[resampled_period]
action_var = input_values[1]
manager_adv_var = input_values[2][resampled_period]
latent_var = input_values[3]['latents']
latent_var_sparse = latent_var[resampled_period]
mean = input_values[3]['mean']
log_std = input_values[3]['log_std']
prob = input_values[3]['prob'][resampled_period]
if self.use_skill_dependent_baseline:
skill_adv_var = input_values[4]
all_input_values = (obs_var, manager_obs_var, action_var,
manager_adv_var, skill_adv_var, latent_var,
latent_var_sparse, mean, log_std, prob)
else:
skill_adv_var = input_values[2]
all_input_values = (obs_var, manager_obs_var, action_var,
manager_adv_var, skill_adv_var, latent_var,
latent_var_sparse, mean, log_std, prob)
# todo: assign current parameters to old policy; does this work?
# old_param_values = self.policy.get_param_values()
# self.old_policy.set_param_values(old_param_values)
loss_before = self.optimizer.loss(all_input_values)
self.optimizer.optimize(all_input_values)
loss_after = self.optimizer.loss(all_input_values)
logger.record_tabular('LossBefore', loss_before)
logger.record_tabular('LossAfter', loss_after)
logger.record_tabular('dLoss', loss_before - loss_after)
return dict()
def get_itr_snapshot(self, itr, samples_data):
return dict(itr=itr,
policy=self.policy,
baseline=self.baseline,
env=self.env)
def log_diagnostics(self, paths):
# paths obtained by self.sampler.obtain_samples
BatchPolopt.log_diagnostics(self, paths)
class ConcurrentContinuousPPO(BatchPolopt):
"""
Designed to enable concurrent training of a SNN that parameterizes skills
and also train the manager at the same time
Note that, if I'm not trying to do the sample approximation of the weird log of sum term,
I don't need to know which skill was picked, just need to know the action
"""
# double check this constructor later
def __init__(
self,
optimizer=None,
optimizer_args=None,
step_size=0.003,
num_latents=6,
latents=None, # some sort of iterable of the actual latent vectors
period=10, # how often I choose a latent
truncate_local_is_ratio=None,
epsilon=0.1,
train_pi_iters=10,
use_skill_dependent_baseline=False,
mlp_skill_dependent_baseline=False,
freeze_manager=False,
freeze_skills=False,
**kwargs):
if optimizer is None:
if optimizer_args is None:
# optimizer_args = dict()
optimizer_args = dict(batch_size=None)
self.optimizer = FirstOrderOptimizer(learning_rate=step_size,
max_epochs=train_pi_iters,
**optimizer_args)
self.step_size = step_size
self.truncate_local_is_ratio = truncate_local_is_ratio
self.epsilon = epsilon
super(ConcurrentContinuousPPO,
self).__init__(**kwargs) # not sure if this line is correct
self.num_latents = kwargs['policy'].latent_dim
self.latents = latents
self.period = period
self.freeze_manager = freeze_manager
self.freeze_skills = freeze_skills
assert (not freeze_manager) or (not freeze_skills)
# todo: fix this sampler stuff
# import pdb; pdb.set_trace()
self.sampler = HierBatchSampler(self, self.period)
# self.sampler = BatchSampler(self)
# i hope this is right
self.diagonal = DiagonalGaussian(
self.policy.low_policy.action_space.flat_dim)
self.debug_fns = []
assert isinstance(self.policy, HierarchicalPolicy)
self.period = self.policy.period
assert self.policy.period == self.period
self.continuous_latent = self.policy.continuous_latent
assert self.continuous_latent
# self.old_policy = copy.deepcopy(self.policy)
# skill dependent baseline
self.use_skill_dependent_baseline = use_skill_dependent_baseline
self.mlp_skill_dependent_baseline = mlp_skill_dependent_baseline
if use_skill_dependent_baseline:
curr_env = kwargs['env']
skill_dependent_action_space = curr_env.action_space
new_obs_space_no_bi = curr_env.observation_space.shape[
0] + 1 # 1 for the t_remaining
skill_dependent_obs_space_dim = (new_obs_space_no_bi *
(self.num_latents + 1) +
self.num_latents, )
skill_dependent_obs_space = Box(
-1.0, 1.0, shape=skill_dependent_obs_space_dim)
skill_dependent_env_spec = EnvSpec(skill_dependent_obs_space,
skill_dependent_action_space)
if self.mlp_skill_dependent_baseline:
self.skill_dependent_baseline = GaussianMLPBaseline(
env_spec=skill_dependent_env_spec)
else:
self.skill_dependent_baseline = LinearFeatureBaseline(
env_spec=skill_dependent_env_spec)
# initialize the computation graph
# optimize is run on >= 1 trajectory at a time
# assumptions: 1 trajectory, which is a multiple of p; that the obs_var_probs is valid
def init_opt(self):
assert isinstance(self.policy, HierarchicalPolicy)
assert not self.freeze_manager and not self.freeze_skills
manager_surr_loss = 0
# skill_surr_loss = 0
obs_var_sparse = ext.new_tensor('sparse_obs',
ndim=2,
dtype=theano.config.floatX)
obs_var_raw = ext.new_tensor(
'obs', ndim=3, dtype=theano.config.floatX) # todo: check the dtype
action_var = self.env.action_space.new_tensor_variable(
'action',
extra_dims=1,
)
advantage_var = ext.new_tensor('advantage',
ndim=1,
dtype=theano.config.floatX)
# latent_var = ext.new_tensor('latents', ndim=2, dtype=theano.config.floatX)
mean_var = ext.new_tensor('mean', ndim=2, dtype=theano.config.floatX)
log_std_var = ext.new_tensor('log_std',
ndim=2,
dtype=theano.config.floatX)
# undoing the reshape, so that batch sampling is ok
obs_var = TT.reshape(obs_var_raw, [
obs_var_raw.shape[0] * obs_var_raw.shape[1], obs_var_raw.shape[2]
])
############################################################
### calculating the skills portion of the surrogate loss ###
############################################################
latent_var_sparse = self.policy.manager.dist_info_sym(
obs_var_sparse)['mean']
latent_var = TT.extra_ops.repeat(latent_var_sparse,
self.period,
axis=0) #.dimshuffle(0, 'x')
dist_info_var = self.policy.low_policy.dist_info_sym(
obs_var, state_info_var=latent_var)
old_dist_info_var = dict(mean=mean_var, log_std=log_std_var)
skill_lr = self.diagonal.likelihood_ratio_sym(action_var,
old_dist_info_var,
dist_info_var)
skill_surr_loss_vector = TT.minimum(
skill_lr * advantage_var,
TT.clip(skill_lr, 1 - self.epsilon, 1 + self.epsilon) *
advantage_var)
skill_surr_loss = -TT.mean(skill_surr_loss_vector)
surr_loss = skill_surr_loss # so that the relative magnitudes are correct
if self.freeze_skills and not self.freeze_manager:
raise NotImplementedError
elif self.freeze_manager and not self.freeze_skills:
raise NotImplementedError
else:
assert (not self.freeze_manager) or (not self.freeze_skills)
input_list = [
obs_var_raw, obs_var_sparse, action_var, advantage_var,
mean_var, log_std_var
]
self.optimizer.update_opt(loss=surr_loss,
target=self.policy,
inputs=input_list)
return dict()
# do the optimization
def optimize_policy(self, itr, samples_data):
print(len(samples_data['observations']), self.period)
assert len(samples_data['observations']) % self.period == 0
# note that I have to do extra preprocessing to the advantages, and also create obs_var_sparse
if self.use_skill_dependent_baseline:
input_values = tuple(
ext.extract(samples_data, "observations", "actions",
"advantages", "agent_infos", "skill_advantages"))
else:
input_values = tuple(
ext.extract(samples_data, "observations", "actions",
"advantages", "agent_infos"))
obs_raw = input_values[0].reshape(
input_values[0].shape[0] // self.period, self.period,
input_values[0].shape[1])
obs_sparse = input_values[0].take(
[i for i in range(0, input_values[0].shape[0], self.period)],
axis=0)
if not self.continuous_latent:
advantage_sparse = input_values[2].reshape(
[input_values[2].shape[0] // self.period, self.period])[:, 0]
latents = input_values[3]['latents']
latents_sparse = latents.take(
[i for i in range(0, latents.shape[0], self.period)], axis=0)
prob = np.array(list(input_values[3]['prob'].take(
[i for i in range(0, latents.shape[0], self.period)], axis=0)),
dtype=np.float32)
mean = input_values[3]['mean']
log_std = input_values[3]['log_std']
if self.use_skill_dependent_baseline:
advantage_var = input_values[4]
else:
advantage_var = input_values[2]
# import ipdb; ipdb.set_trace()
if self.freeze_skills and not self.freeze_manager:
raise NotImplementedError
elif self.freeze_manager and not self.freeze_skills:
raise NotImplementedError
else:
assert (not self.freeze_manager) or (not self.freeze_skills)
all_input_values = (obs_raw, obs_sparse, input_values[1],
advantage_var, mean, log_std)
# todo: assign current parameters to old policy; does this work?
# old_param_values = self.policy.get_param_values(trainable=True)
# self.old_policy.set_param_values(old_param_values, trainable=True)
# old_param_values = self.policy.get_param_values()
# self.old_policy.set_param_values(old_param_values)
loss_before = self.optimizer.loss(all_input_values)
self.optimizer.optimize(all_input_values)
loss_after = self.optimizer.loss(all_input_values)
logger.record_tabular('LossBefore', loss_before)
logger.record_tabular('LossAfter', loss_after)
logger.record_tabular('dLoss', loss_before - loss_after)
return dict()
def get_itr_snapshot(self, itr, samples_data):
return dict(itr=itr,
policy=self.policy,
baseline=self.baseline,
env=self.env)
def log_diagnostics(self, paths):
# paths obtained by self.sampler.obtain_samples
BatchPolopt.log_diagnostics(self, paths)