def begin(self):
self._steps_per_run_variable = \
basic_session_run_hooks.get_or_create_steps_per_run_variable()
def begin(self):
self._steps_per_run_variable = \
basic_session_run_hooks.get_or_create_steps_per_run_variable()
def evaluate_once(checkpoint_path,
master='',
scaffold=None,
eval_ops=None,
feed_dict=None,
final_ops=None,
final_ops_feed_dict=None,
hooks=None,
config=None):
"""Evaluates the model at the given checkpoint path.
During a single evaluation, the `eval_ops` is run until the session is
interrupted or requested to finish. This is typically requested via a
`StopAfterNEvalsHook` which results in `eval_ops` running the requested number
of times.
Optionally, a user can pass in `final_ops`, a single `Tensor`, a list of
`Tensors` or a dictionary from names to `Tensors`. The `final_ops` is
evaluated a single time after `eval_ops` has finished running and the fetched
values of `final_ops` are returned. If `final_ops` is left as `None`, then
`None` is returned.
One may also consider using a `SummaryAtEndHook` to record summaries after the
`eval_ops` have run. If `eval_ops` is `None`, the summaries run immediately
after the model checkpoint has been restored.
Note that `evaluate_once` creates a local variable used to track the number of
evaluations run via `get_or_create_eval_step`.
Consequently, if a custom local init op is provided via a `scaffold`, the
caller should ensure that the local init op also initializes the eval step.
Args:
checkpoint_path: The path to a checkpoint to use for evaluation.
master: The BNS address of the TensorFlow master.
scaffold: An tf.train.Scaffold instance for initializing variables and
restoring variables. Note that `scaffold.init_fn` is used by the function
to restore the checkpoint. If you supply a custom init_fn, then it must
also take care of restoring the model from its checkpoint.
eval_ops: A single `Tensor`, a list of `Tensors` or a dictionary of names
to `Tensors`, which is run until the session is requested to stop,
commonly done by a `StopAfterNEvalsHook`.
feed_dict: The feed dictionary to use when executing the `eval_ops`.
final_ops: A single `Tensor`, a list of `Tensors` or a dictionary of names
to `Tensors`.
final_ops_feed_dict: A feed dictionary to use when evaluating `final_ops`.
hooks: List of `tf.train.SessionRunHook` callbacks which are run inside the
evaluation loop.
config: An instance of `tf.ConfigProto` that will be used to
configure the `Session`. If left as `None`, the default will be used.
Returns:
The fetched values of `final_ops` or `None` if `final_ops` is `None`.
"""
eval_step = get_or_create_eval_step()
# Prepare the run hooks.
hooks = list(hooks or [])
if eval_ops is not None:
if any(isinstance(h, MultiStepStopAfterNEvalsHook) for h in hooks):
steps_per_run_variable = \
basic_session_run_hooks.get_or_create_steps_per_run_variable()
update_eval_step = tf.compat.v1.assign_add(
eval_step,
tf.cast(steps_per_run_variable, dtype=eval_step.dtype),
use_locking=True)
else:
update_eval_step = tf.compat.v1.assign_add(eval_step, 1, use_locking=True)
if isinstance(eval_ops, dict):
eval_ops['update_eval_step'] = update_eval_step
elif isinstance(eval_ops, (tuple, list)):
eval_ops = list(eval_ops) + [update_eval_step]
else:
eval_ops = [eval_ops, update_eval_step]
eval_step_value = get_latest_eval_step_value(eval_ops)
for h in hooks:
if isinstance(h, (StopAfterNEvalsHook, MultiStepStopAfterNEvalsHook)):
h._set_evals_completed_tensor(eval_step_value) # pylint: disable=protected-access
tf.compat.v1.logging.info(
'Starting evaluation at ' +
time.strftime('%Y-%m-%dT%H:%M:%SZ', time.localtime()))
# Prepare the session creator.
session_creator = tf.compat.v1.train.ChiefSessionCreator(
scaffold=scaffold,
checkpoint_filename_with_path=checkpoint_path,
master=master,
config=config)
final_ops_hook = tf.estimator.FinalOpsHook(final_ops, final_ops_feed_dict)
hooks.append(final_ops_hook)
with tf.compat.v1.train.MonitoredSession(
session_creator=session_creator, hooks=hooks) as session:
if eval_ops is not None:
while not session.should_stop():
session.run(eval_ops, feed_dict)
tf.compat.v1.logging.info(
'Finished evaluation at ' +
time.strftime('%Y-%m-%d-%H:%M:%S', time.localtime()))
return final_ops_hook.final_ops_values
def _evaluate_once(checkpoint_path,
master='',
scaffold=None,
eval_ops=None,
feed_dict=None,
final_ops=None,
final_ops_feed_dict=None,
hooks=None,
config=None):
"""Evaluates the model at the given checkpoint path.
During a single evaluation, the `eval_ops` is run until the session is
interrupted or requested to finish. This is typically requested via a
`tf.contrib.training.StopAfterNEvalsHook` which results in `eval_ops` running
the requested number of times.
Optionally, a user can pass in `final_ops`, a single `Tensor`, a list of
`Tensors` or a dictionary from names to `Tensors`. The `final_ops` is
evaluated a single time after `eval_ops` has finished running and the fetched
values of `final_ops` are returned. If `final_ops` is left as `None`, then
`None` is returned.
One may also consider using a `tf.contrib.training.SummaryAtEndHook` to record
summaries after the `eval_ops` have run. If `eval_ops` is `None`, the
summaries run immediately after the model checkpoint has been restored.
Note that `evaluate_once` creates a local variable used to track the number of
evaluations run via `tf.contrib.training.get_or_create_eval_step`.
Consequently, if a custom local init op is provided via a `scaffold`, the
caller should ensure that the local init op also initializes the eval step.
Args:
checkpoint_path: The path to a checkpoint to use for evaluation.
master: The BNS address of the TensorFlow master.
scaffold: An tf.train.Scaffold instance for initializing variables and
restoring variables. Note that `scaffold.init_fn` is used by the function
to restore the checkpoint. If you supply a custom init_fn, then it must
also take care of restoring the model from its checkpoint.
eval_ops: A single `Tensor`, a list of `Tensors` or a dictionary of names
to `Tensors`, which is run until the session is requested to stop,
commonly done by a `tf.contrib.training.StopAfterNEvalsHook`.
feed_dict: The feed dictionary to use when executing the `eval_ops`.
final_ops: A single `Tensor`, a list of `Tensors` or a dictionary of names
to `Tensors`.
final_ops_feed_dict: A feed dictionary to use when evaluating `final_ops`.
hooks: List of `tf.train.SessionRunHook` callbacks which are run inside the
evaluation loop.
config: An instance of `tf.ConfigProto` that will be used to
configure the `Session`. If left as `None`, the default will be used.
Returns:
The fetched values of `final_ops` or `None` if `final_ops` is `None`.
"""
eval_step = _get_or_create_eval_step()
# Prepare the run hooks.
hooks = list(hooks or [])
if eval_ops is not None:
if any(isinstance(h, _MultiStepStopAfterNEvalsHook) for h in hooks):
steps_per_run_variable = \
basic_session_run_hooks.get_or_create_steps_per_run_variable()
update_eval_step = state_ops.assign_add(
eval_step,
math_ops.cast(steps_per_run_variable, dtype=eval_step.dtype),
use_locking=True)
else:
update_eval_step = state_ops.assign_add(eval_step, 1, use_locking=True)
if isinstance(eval_ops, dict):
eval_ops['update_eval_step'] = update_eval_step
elif isinstance(eval_ops, (tuple, list)):
eval_ops = list(eval_ops) + [update_eval_step]
else:
eval_ops = [eval_ops, update_eval_step]
eval_step_value = _get_latest_eval_step_value(eval_ops)
for h in hooks:
if isinstance(h, (_StopAfterNEvalsHook, _MultiStepStopAfterNEvalsHook)):
h._set_evals_completed_tensor(eval_step_value) # pylint: disable=protected-access
logging.info('Starting evaluation at ' + time.strftime('%Y-%m-%dT%H:%M:%SZ',
time.gmtime()))
# Prepare the session creator.
session_creator = monitored_session.ChiefSessionCreator(
scaffold=scaffold,
checkpoint_filename_with_path=checkpoint_path,
master=master,
config=config)
final_ops_hook = basic_session_run_hooks.FinalOpsHook(
final_ops, final_ops_feed_dict)
hooks.append(final_ops_hook)
with monitored_session.MonitoredSession(
session_creator=session_creator, hooks=hooks) as session:
if eval_ops is not None:
while not session.should_stop():
session.run(eval_ops, feed_dict)
logging.info('Finished evaluation at ' + time.strftime('%Y-%m-%d-%H:%M:%S',
time.gmtime()))
return final_ops_hook.final_ops_values
