def obtain_samples(self, itr, batch_size=None, whole_paths=True):
"""Collect samples for the given iteration number.
Args:
itr (int): Number of iteration.
batch_size (int): Number of environment steps in one batch.
whole_paths (bool): Whether to use whole path or truncated.
Returns:
list[dict]: A list of paths.
"""
if not batch_size:
batch_size = self.algo.max_path_length * self.n_envs
cur_policy_params = self.algo.policy.get_param_values()
paths = parallel_sampler.sample_paths(
policy_params=cur_policy_params,
max_samples=batch_size,
max_path_length=self.algo.max_path_length,
scope=self.algo.scope,
)
if whole_paths:
return paths
else:
paths_truncated = truncate_paths(paths, batch_size)
return paths_truncated
def test_truncate_paths(self):
paths = [
dict(
observations=np.zeros((100, 1)),
actions=np.zeros((100, 1)),
rewards=np.zeros(100),
env_infos=dict(),
agent_infos=dict(lala=np.zeros(100)),
),
dict(
observations=np.zeros((50, 1)),
actions=np.zeros((50, 1)),
rewards=np.zeros(50),
env_infos=dict(),
agent_infos=dict(lala=np.zeros(50)),
),
]
truncated = truncate_paths(paths, 130)
assert len(truncated) == 2
assert len(truncated[-1]['observations']) == 30
assert len(truncated[0]['observations']) == 100
# make sure not to change the original one
assert len(paths) == 2
assert len(paths[-1]['observations']) == 50
def _obtain_is_samples(self, _itr, batch_size=None, whole_paths=True):
"""Collect IS samples for the given iteration number.
Args:
_itr (int): Number of iteration.
batch_size (int): Number of batch size.
whole_paths (bool): Whether to use whole path or truncated.
Returns:
list: A list of paths.
"""
if batch_size is None:
batch_size = self.algo.max_path_length
paths = []
for hist_policy_distribution, hist_paths in self.get_history_list(
self.n_backtrack):
h_paths = self._sample_isweighted_paths(
policy=self.algo.policy,
hist_policy_distribution=hist_policy_distribution,
max_samples=batch_size,
paths=hist_paths,
hist_variance_penalty=self.hist_variance_penalty,
max_is_ratio=self.max_is_ratio,
ess_threshold=self.ess_threshold,
)
paths.extend(h_paths)
if len(paths) > batch_size:
paths = random.sample(paths, batch_size)
return paths if whole_paths else truncate_paths(paths, batch_size)
def test_truncates(self):
truncated = utils.truncate_paths(self.paths, 130)
assert len(truncated) == 2
assert len(truncated[-1]['observations']) == 30
assert len(truncated[0]['observations']) == 100
# make sure not to change the original one
assert len(self.paths) == 2
assert len(self.paths[-1]['observations']) == 50
def obtain_samples(self, itr, batch_size=None, whole_paths=True):
"""Sample the policy for new trajectories.
Args:
itr (int): Number of iteration.
batch_size (int): Number of environment steps in one batch.
whole_paths (bool): Whether to use whole path or truncated.
Returns:
list[dict]: A list of paths.
"""
if not batch_size:
batch_size = self.algo.max_path_length
cur_params = self.algo.policy.get_param_values()
paths = parallel_sampler.sample_paths(
policy_params=cur_params,
max_samples=batch_size,
max_path_length=self.algo.max_path_length,
scope=self.algo.scope,
)
return paths if whole_paths else truncate_paths(paths, batch_size)
def obtain_samples(self, itr, batch_size=None, whole_paths=True):
"""Sample the policy for new trajectories.
If batch size is not specified, episode per task by default is 1 so
batch size will be meta_batch_size * max_path_length.
When number of workers are less than meta batch size, sampling will
be performed for each of self._vec_envs_indices in series. The
i-th value of self._vec_envs_indices represents the indices of the
environments/tasks to be sampled for the i-th iteration.
Args:
itr (int): Iteration number.
batch_size (int): Number of samples to be collected. If None,
it will be default [algo.max_path_length * n_envs].
whole_paths (bool): Whether return all the paths or not. True
by default. It's possible for the paths to have total actual
sample size larger than batch_size, and will be truncated if
this flag is true.
Returns:
OrderedDict: Sample paths. Key represents the index of the
environment/task and value represents all the paths sampled
from that particular environment/task.
Note:
Each path is a dictionary, with keys and values as following:
* observations: numpy.ndarray with shape :math:`[N, S^*]`
* actions: numpy.ndarray with shape :math:`[N, S^*]`
* rewards: numpy.ndarray with shape :math:`[N, S^*]`
* dones: numpy.ndarray with shape :math:`[N, S^*]`
* env_infos: A dictionary with each key representing one
environment info, value being a numpy.ndarray with shape
:math:`[N, S^*]`. One example is "ale.lives" for atari
environments.
* agent_infos: A dictionary with each key representing one
agent info, value being a numpy.ndarray with shape
:math:`[N, S^*]`. One example is "prev_action", which is used
for recurrent policy as previous action input, merged with
the observation input as the state input.
"""
logger.log('Obtaining samples for iteration %d...' % itr)
if batch_size is None:
batch_size = self.algo.max_path_length * self._meta_batch_size
paths = []
tasks = self.env.sample_tasks(self._meta_batch_size)
# Start main loop
batch_size_per_loop = batch_size // len(self._vec_envs_indices)
for vec_envs_indices in self._vec_envs_indices:
self._setup_worker(vec_envs_indices, tasks)
n_samples = 0
obses = self._vec_env.reset()
dones = np.asarray([True] * self._vec_env.num_envs)
running_paths = [None] * self._vec_env.num_envs
pbar = ProgBarCounter(batch_size)
policy_time = 0
env_time = 0
process_time = 0
policy = self.algo.policy
# Only reset policies at the beginning of a meta batch
policy.reset(dones)
while n_samples < batch_size_per_loop:
t = time.time()
actions, agent_infos = policy.get_actions(obses)
policy_time += time.time() - t
t = time.time()
next_obses, rewards, dones, env_infos = self._vec_env.step(
actions)
env_time += time.time() - t
t = time.time()
agent_infos = tensor_utils.split_tensor_dict_list(agent_infos)
env_infos = tensor_utils.split_tensor_dict_list(env_infos)
if env_infos is None:
env_infos = [dict() for _ in range(self._vec_env.num_envs)]
if agent_infos is None:
agent_infos = [
dict() for _ in range(self._vec_env.num_envs)
]
for idx, observation, action, reward, env_info, agent_info, done in zip( # noqa: E501
itertools.count(), obses, actions, rewards, env_infos,
agent_infos, dones):
if running_paths[idx] is None:
running_paths[idx] = dict(
observations=[],
actions=[],
rewards=[],
dones=[],
env_infos=[],
agent_infos=[],
)
running_paths[idx]['observations'].append(observation)
running_paths[idx]['actions'].append(action)
running_paths[idx]['rewards'].append(reward)
running_paths[idx]['dones'].append(done)
running_paths[idx]['env_infos'].append(env_info)
running_paths[idx]['agent_infos'].append(agent_info)
if done:
obs = np.asarray(running_paths[idx]['observations'])
actions = np.asarray(running_paths[idx]['actions'])
paths.append(
dict(observations=obs,
actions=actions,
rewards=np.asarray(
running_paths[idx]['rewards']),
dones=np.asarray(running_paths[idx]['dones']),
env_infos=tensor_utils.stack_tensor_dict_list(
running_paths[idx]['env_infos']),
agent_infos=tensor_utils.
stack_tensor_dict_list(
running_paths[idx]['agent_infos']),
batch_idx=idx))
n_samples += len(running_paths[idx]['rewards'])
running_paths[idx] = None
process_time += time.time() - t
pbar.inc(len(obses))
obses = next_obses
pbar.stop()
tabular.record('PolicyExecTime', policy_time)
tabular.record('EnvExecTime', env_time)
tabular.record('ProcessExecTime', process_time)
return paths if whole_paths else truncate_paths(paths, batch_size)
def test_invalid_path(self):
self.paths[0]['invalid'] = None
with pytest.raises(ValueError):
utils.truncate_paths(self.paths, 3)
def test_truncates_dict(self):
truncated = utils.truncate_paths(self.paths_dict, 130)
assert len(truncated) == 2
assert len(truncated[-1]['agent_infos']['lala']['baba']) == 30
assert len(truncated[0]['agent_infos']['lala']['baba']) == 100
def obtain_samples(self, itr, batch_size=None, whole_paths=True):
"""Sample the policy for new trajectories.
Args:
itr (int): Iteration number.
batch_size (int): Number of samples to be collected. If None,
it will be default [algo.max_path_length * n_envs].
whole_paths (bool): Whether return all the paths or not. True
by default. It's possible for the paths to have total actual
sample size larger than batch_size, and will be truncated if
this flag is true.
Returns:
list[dict]: Sample paths.
Note:
Each path is a dictionary, with keys and values as following:
* observations: numpy.ndarray with shape [Batch, *obs_dims]
* actions: numpy.ndarray with shape [Batch, *act_dims]
* rewards: numpy.ndarray with shape [Batch, ]
* env_infos: A dictionary with each key representing one
environment info, value being a numpy.ndarray with shape
[Batch, ?]. One example is "ale.lives" for atari
environments.
* agent_infos: A dictionary with each key representing one
agent info, value being a numpy.ndarray with shape
[Batch, ?]. One example is "prev_action", which is used
for recurrent policy as previous action input, merged with
the observation input as the state input.
* dones: numpy.ndarray with shape [Batch, ]
"""
logger.log('Obtaining samples for iteration %d...' % itr)
if not batch_size:
batch_size = self.algo.max_path_length * self._n_envs
paths = []
n_samples = 0
obses = self._vec_env.reset()
dones = np.asarray([True] * self._vec_env.num_envs)
running_paths = [None] * self._vec_env.num_envs
policy_time = 0
env_time = 0
process_time = 0
policy = self.algo.policy
with click.progressbar(length=batch_size, label='Sampling') as pbar:
while n_samples < batch_size:
t = time.time()
policy.reset(dones)
actions, agent_infos = policy.get_actions(obses)
policy_time += time.time() - t
t = time.time()
next_obses, rewards, dones, env_infos = \
self._vec_env.step(actions)
env_time += time.time() - t
t = time.time()
agent_infos = tensor_utils.split_tensor_dict_list(agent_infos)
env_infos = tensor_utils.split_tensor_dict_list(env_infos)
if env_infos is None:
env_infos = [dict() for _ in range(self._vec_env.num_envs)]
if agent_infos is None:
agent_infos = [
dict() for _ in range(self._vec_env.num_envs)
]
for idx, observation, action, reward, env_info, agent_info, done in zip( # noqa: E501
itertools.count(), obses, actions, rewards, env_infos,
agent_infos, dones):
if running_paths[idx] is None:
running_paths[idx] = dict(observations=[],
actions=[],
rewards=[],
env_infos=[],
agent_infos=[],
dones=[])
running_paths[idx]['observations'].append(observation)
running_paths[idx]['actions'].append(action)
running_paths[idx]['rewards'].append(reward)
running_paths[idx]['env_infos'].append(env_info)
running_paths[idx]['agent_infos'].append(agent_info)
running_paths[idx]['dones'].append(done)
if done:
obs = np.asarray(running_paths[idx]['observations'])
actions = np.asarray(running_paths[idx]['actions'])
paths.append(
dict(observations=obs,
actions=actions,
rewards=np.asarray(
running_paths[idx]['rewards']),
env_infos=tensor_utils.stack_tensor_dict_list(
running_paths[idx]['env_infos']),
agent_infos=tensor_utils.
stack_tensor_dict_list(
running_paths[idx]['agent_infos']),
dones=np.asarray(
running_paths[idx]['dones'])))
n_samples += len(running_paths[idx]['rewards'])
running_paths[idx] = None
process_time += time.time() - t
pbar.update(len(obses))
obses = next_obses
tabular.record('PolicyExecTime', policy_time)
tabular.record('EnvExecTime', env_time)
tabular.record('ProcessExecTime', process_time)
return paths if whole_paths else truncate_paths(paths, batch_size)