def _set_up(self, eval_mode):
"""Sets up the runner by creating and initializing the agent."""
# Reset the tf default graph to avoid name collisions from previous runs
# before doing anything else.
tf.reset_default_graph()
self._summary_writer = tf.summary.FileWriter(self._output_dir)
if self._episode_log_file:
self._episode_writer = tf.io.TFRecordWriter(
os.path.join(self._output_dir, self._episode_log_file))
# Set up a session and initialize variables.
self._sess = tf.Session(config=tf.ConfigProto(
allow_soft_placement=True))
self._agent = self._create_agent_fn(
self._sess,
self._env,
summary_writer=self._summary_writer,
eval_mode=eval_mode)
# type check: env/agent must both be multi- or single-user
if self._agent.multi_user and not isinstance(
self._env.environment, environment.MultiUserEnvironment):
raise ValueError(
'Multi-user agent requires multi-user environment.')
if not self._agent.multi_user and isinstance(
self._env.environment, environment.MultiUserEnvironment):
raise ValueError(
'Single-user agent requires single-user environment.')
self._summary_writer.add_graph(graph=tf.get_default_graph())
self._sess.run(tf.global_variables_initializer())
self._sess.run(tf.local_variables_initializer())
def _set_up(self, eval_mode):
"""Sets up the runner by creating and initializing the agent."""
# Reset the tf default graph to avoid name collisions from previous runs
# before doing anything else.
tf.reset_default_graph()
self._summary_writer = tf.summary.FileWriter(self._output_dir)
if self._episode_log_file:
self._episode_writer = tf.python_io.TFRecordWriter(
os.path.join(self._output_dir, self._episode_log_file))
# Set up a session and initialize variables.
self._sess = tf.Session(config=tf.ConfigProto(
allow_soft_placement=True))
self._agent = self._create_agent_fn(
self._sess,
self._env,
summary_writer=self._summary_writer,
eval_mode=eval_mode)
self._summary_writer.add_graph(graph=tf.get_default_graph())
self._sess.run(tf.global_variables_initializer())
self._sess.run(tf.local_variables_initializer())
def __init__(self,
base_dir,
data_load_fn=load_data,
checkpoint_file_prefix='ckpt',
logging_file_prefix='log',
log_every_n=1,
num_iterations=200,
training_steps=250,
batch_size=100,
evaluation_inputs=None,
evaluation_size=None):
"""Initialize the Runner object in charge of running a full experiment.
Args:
base_dir: str, the base directory to host all required sub-directories.
data_load_fn: function that returns data as a tuple (inputs, outputs).
checkpoint_file_prefix: str, the prefix to use for checkpoint files.
logging_file_prefix: str, prefix to use for the log files.
log_every_n: int, the frequency for writing logs.
num_iterations: int, the iteration number threshold (must be greater than
start_iteration).
training_steps: int, the number of training steps to perform.
batch_size: int, batch size used for the training.
evaluation_inputs: tuple of inputs to the generator that can be used
during qualitative evaluation. If None, inputs set passed above will
be used.
evaluation_size: int, the number of images that should be generated
randomly sampling from the data specified in evaluation_inputs. If
None, all evaluation_inputs are generated.
This constructor will take the following actions:
- Initialize a `tf.Session`.
- Initialize a logger.
- Initialize a generator.
- Reload from the latest checkpoint, if available, and initialize the
Checkpointer object.
"""
assert base_dir is not None
inputs, data_to_generate = data_load_fn()
assert inputs is None or inputs.shape[0] == data_to_generate.shape[0]
assert evaluation_inputs is None or \
evaluation_inputs.shape[1:] == inputs.shape[1:]
assert evaluation_inputs is not None or evaluation_size is not None, \
'Either evaluation_inputs or evaluation_size has to be initialised.'
self._logging_file_prefix = logging_file_prefix
self._log_every_n = log_every_n
self._data_to_generate = data_to_generate
self._inputs = inputs
self._num_iterations = num_iterations
self._training_steps = training_steps
self._batch_size = batch_size
self._evaluation_inputs = evaluation_inputs
if self._evaluation_inputs is None:
self._evaluation_inputs = inputs
self._evaluation_size = evaluation_size
self._base_dir = base_dir
self._create_directories()
self._summary_writer = tf.summary.FileWriter(self._base_dir)
config = tf.ConfigProto(allow_soft_placement=True)
# Allocate only subset of the GPU memory as needed which allows for running
# multiple workers on the same GPU.
config.gpu_options.allow_growth = True
# Set up a session and initialize variables.
self._sess = tf.Session('', config=config)
self._generator = create_generator(self._sess,
data_to_generate,
inputs,
summary_writer=self._summary_writer)
self._summary_writer.add_graph(graph=tf.get_default_graph())
self._sess.run(tf.global_variables_initializer())
self._initialize_checkpointer_and_maybe_resume(checkpoint_file_prefix)
def __init__(self,
base_dir,
create_agent_fn,
create_environment_fn=atari_lib.create_atari_environment,
checkpoint_file_prefix='ckpt',
logging_file_prefix='log',
log_every_n=1,
num_iterations=200,
training_steps=250000,
evaluation_steps=125000,
max_steps_per_episode=27000,
reward_clipping=(-1, 1)):
"""Initialize the Runner object in charge of running a full experiment.
Args:
base_dir: str, the base directory to host all required sub-directories.
create_agent_fn: A function that takes as args a Tensorflow session and an
environment, and returns an agent.
create_environment_fn: A function which receives a problem name and
creates a Gym environment for that problem (e.g. an Atari 2600 game).
checkpoint_file_prefix: str, the prefix to use for checkpoint files.
logging_file_prefix: str, prefix to use for the log files.
log_every_n: int, the frequency for writing logs.
num_iterations: int, the iteration number threshold (must be greater than
start_iteration).
training_steps: int, the number of training steps to perform.
evaluation_steps: int, the number of evaluation steps to perform.
max_steps_per_episode: int, maximum number of steps after which an episode
terminates.
reward_clipping: Tuple(int, int), with the minimum and maximum bounds for
reward at each step. If `None` no clipping is applied.
This constructor will take the following actions:
- Initialize an environment.
- Initialize a `tf.Session`.
- Initialize a logger.
- Initialize an agent.
- Reload from the latest checkpoint, if available, and initialize the
Checkpointer object.
"""
assert base_dir is not None
self._logging_file_prefix = logging_file_prefix
self._log_every_n = log_every_n
self._num_iterations = num_iterations
self._training_steps = training_steps
self._evaluation_steps = evaluation_steps
self._max_steps_per_episode = max_steps_per_episode
self._base_dir = base_dir
self._create_directories()
self._summary_writer = tf.summary.FileWriter(self._base_dir)
self._environment = create_environment_fn()
# Set up a session and initialize variables.
config = tf.ConfigProto(allow_soft_placement=True)
config.gpu_options.allow_growth = True
self._sess = tf.Session('', config=config)
self._agent = create_agent_fn(self._sess,
self._environment,
summary_writer=self._summary_writer)
self._summary_writer.add_graph(graph=tf.get_default_graph())
self._sess.run(tf.global_variables_initializer())
self._initialize_checkpointer_and_maybe_resume(checkpoint_file_prefix)
self._reward_clipping = reward_clipping
def learn_metric(self, verbose=False):
"""Approximate the bisimulation metric by learning.
Args:
verbose: bool, whether to print verbose messages.
"""
summary_writer = tf.summary.FileWriter(self.base_dir)
global_step = tf.Variable(0, trainable=False)
inc_global_step_op = tf.assign_add(global_step, 1)
bisim_horizon = 0.0
bisim_horizon_discount_value = 1.0
if self.use_decayed_learning_rate:
learning_rate = tf.train.exponential_decay(self.starting_learning_rate,
global_step,
self.num_iterations,
self.learning_rate_decay,
staircase=self.staircase)
else:
learning_rate = self.starting_learning_rate
tf.summary.scalar('Learning/LearningRate', learning_rate)
optimizer = tf.train.AdamOptimizer(learning_rate=learning_rate,
epsilon=self.epsilon)
train_op = self._build_train_op(optimizer)
sync_op = self._build_sync_op()
eval_op = tf.stop_gradient(self._build_eval_metric())
eval_states = []
# Build the evaluation tensor.
for state in range(self.num_states):
row, col = self.inverse_index_states[state]
# We make the evaluation states at the center of each grid cell.
eval_states.append([row + 0.5, col + 0.5])
eval_states = np.array(eval_states, dtype=np.float64)
normalized_bisim_metric = (
self.bisim_metric / np.linalg.norm(self.bisim_metric))
metric_errors = []
average_metric_errors = []
normalized_metric_errors = []
average_normalized_metric_errors = []
saver = tf.train.Saver(max_to_keep=3)
with tf.Session() as sess:
summary_writer.add_graph(graph=tf.get_default_graph())
sess.run(tf.global_variables_initializer())
merged_summaries = tf.summary.merge_all()
for i in range(self.num_iterations):
sampled_states = np.random.randint(self.num_states,
size=(self.batch_size,))
sampled_actions = np.random.randint(4,
size=(self.batch_size,))
if self.add_noise:
sampled_noise = np.clip(
np.random.normal(0, 0.1, size=(self.batch_size, 2)),
-0.3, 0.3)
sampled_action_names = [self.actions[x] for x in sampled_actions]
next_states = [self.next_states[a][s]
for s, a in zip(sampled_states, sampled_action_names)]
rewards = np.array([self.rewards[a][s]
for s, a in zip(sampled_states,
sampled_action_names)])
states = np.array(
[self.inverse_index_states[x] for x in sampled_states])
next_states = np.array([self.inverse_index_states[x]
for x in next_states])
states = states.astype(np.float64)
states += 0.5 # Place points in center of grid.
next_states = next_states.astype(np.float64)
next_states += 0.5
if self.add_noise:
states += sampled_noise
next_states += sampled_noise
_, summary = sess.run(
[train_op, merged_summaries],
feed_dict={self.s1_ph: states,
self.s2_ph: next_states,
self.action_ph: sampled_actions,
self.rewards_ph: rewards,
self.bisim_horizon_ph: bisim_horizon,
self.eval_states_ph: eval_states})
summary_writer.add_summary(summary, i)
if self.double_period_halfway and i > self.num_iterations / 2.:
self.target_update_period *= 2
self.double_period_halfway = False
if i % self.target_update_period == 0:
bisim_horizon = 1.0 - bisim_horizon_discount_value
bisim_horizon_discount_value *= self.bisim_horizon_discount
sess.run(sync_op)
# Now compute difference with exact metric.
self.learned_distance = sess.run(
eval_op, feed_dict={self.eval_states_ph: eval_states})
self.learned_distance = np.reshape(self.learned_distance,
(self.num_states, self.num_states))
metric_difference = np.max(
abs(self.learned_distance - self.bisim_metric))
average_metric_difference = np.mean(
abs(self.learned_distance - self.bisim_metric))
normalized_learned_distance = (
self.learned_distance / np.linalg.norm(self.learned_distance))
normalized_metric_difference = np.max(
abs(normalized_learned_distance - normalized_bisim_metric))
average_normalized_metric_difference = np.mean(
abs(normalized_learned_distance - normalized_bisim_metric))
error_summary = tf.Summary(value=[
tf.Summary.Value(tag='Approx/Error',
simple_value=metric_difference),
tf.Summary.Value(tag='Approx/AvgError',
simple_value=average_metric_difference),
tf.Summary.Value(tag='Approx/NormalizedError',
simple_value=normalized_metric_difference),
tf.Summary.Value(tag='Approx/AvgNormalizedError',
simple_value=average_normalized_metric_difference),
])
summary_writer.add_summary(error_summary, i)
sess.run(inc_global_step_op)
if i % 100 == 0:
# Collect statistics every 100 steps.
metric_errors.append(metric_difference)
average_metric_errors.append(average_metric_difference)
normalized_metric_errors.append(normalized_metric_difference)
average_normalized_metric_errors.append(
average_normalized_metric_difference)
saver.save(sess, os.path.join(self.base_dir, 'tf_ckpt'),
global_step=i)
if self.debug and i % 100 == 0:
self.pretty_print_metric(metric_type='learned')
print('Iteration: {}'.format(i))
print('Metric difference: {}'.format(metric_difference))
print('Normalized metric difference: {}'.format(
normalized_metric_difference))
if self.add_noise:
# Finally, if we have noise, we draw a bunch of samples to get estimates
# of the distances between states.
sampled_distances = {}
for _ in range(self.total_final_samples):
eval_states = []
for state in range(self.num_states):
row, col = self.inverse_index_states[state]
# We make the evaluation states at the center of each grid cell.
eval_states.append([row + 0.5, col + 0.5])
eval_states = np.array(eval_states, dtype=np.float64)
eval_noise = np.clip(
np.random.normal(0, 0.1, size=(self.num_states, 2)),
-0.3, 0.3)
eval_states += eval_noise
distance_samples = sess.run(
eval_op, feed_dict={self.eval_states_ph: eval_states})
distance_samples = np.reshape(distance_samples,
(self.num_states, self.num_states))
for s1 in range(self.num_states):
for s2 in range(self.num_states):
sampled_distances[(tuple(eval_states[s1]),
tuple(eval_states[s2]))] = (
distance_samples[s1, s2])
else:
# Otherwise we just use the last evaluation metric.
sampled_distances = self.learned_distance
learned_statistics = {
'num_iterations': self.num_iterations,
'metric_errors': metric_errors,
'average_metric_errors': average_metric_errors,
'normalized_metric_errors': normalized_metric_errors,
'average_normalized_metric_errors': average_normalized_metric_errors,
'learned_distances': sampled_distances,
}
self.statistics['learned'] = learned_statistics
if verbose:
self.pretty_print_metric(metric_type='learned')
def reset():
with tf.get_default_graph() as g:
tf.reset_default_graph()
def __init__(self,
base_dir,
agent_creator,
create_environment_fn=create_atari_environment,
game_name=None,
checkpoint_file_prefix='ckpt',
logging_file_prefix='log',
log_every_n=1,
num_iterations=200,
training_steps=250000,
evaluation_steps=125000,
max_steps_per_episode=27000):
"""Initialize the Runner object in charge of running a full experiment.
Args:
base_dir: str, the base directory to host all required sub-directories.
agent_creator: A function that takes as args a Tensorflow session and an
Atari 2600 Gym environment, and returns an agent.
create_environment_fn: A function which receives a game name and creates
an Atari 2600 Gym environment.
game_name: str, name of the Atari 2600 domain to run.
sticky_actions: bool, whether to enable sticky actions in the environment.
checkpoint_file_prefix: str, the prefix to use for checkpoint files.
logging_file_prefix: str, prefix to use for the log files.
log_every_n: int, the frequency for writing logs.
num_iterations: int, the iteration number threshold (must be greater than
start_iteration).
training_steps: int, the number of training steps to perform.
evaluation_steps: int, the number of evaluation steps to perform.
max_steps_per_episode: int, maximum number of steps after which an episode
terminates.
This constructor will take the following actions:
- Initialize an environment.
- Initialize a `tf.Session`.
- Initialize a logger.
- Initialize an agent.
- Reload from the latest checkpoint, if available, and initialize the
Checkpointer object.
"""
assert base_dir is not None
self._logging_file_prefix = logging_file_prefix
self._log_every_n = log_every_n
self._num_iterations = num_iterations
self._training_steps = training_steps
self._evaluation_steps = evaluation_steps
self._max_steps_per_episode = max_steps_per_episode
self._base_dir = base_dir
self._create_directories()
self._summary_writer = tf.summary.FileWriter(self._base_dir)
self._environment = create_environment_fn()
# Set up a session and initialize variables.
self._sess = tf.Session(
'', config=tf.ConfigProto(allow_soft_placement=True))
self._agent = agent_creator(self._sess,
self._environment,
summary_writer=self._summary_writer)
self._summary_writer.add_graph(graph=tf.get_default_graph())
self._sess.run(tf.global_variables_initializer())
self._summary_helper = SummaryHelper(self._summary_writer)
self._initialize_checkpointer_and_maybe_resume(checkpoint_file_prefix)
self._steps_done = 0
self._total_timer = None