def testBuildEmptyOptimizer(self):
optimizer_text_proto = """
"""
optimizer_proto = optimizer_pb2.Optimizer()
text_format.Merge(optimizer_text_proto, optimizer_proto)
with self.assertRaises(ValueError):
optimizer_builder.build(optimizer_proto)
def testBuildAdamOptimizer(self):
optimizer_text_proto = """
adam_optimizer: {
learning_rate: {
constant_learning_rate {
learning_rate: 0.002
}
}
}
use_moving_average: false
"""
optimizer_proto = optimizer_pb2.Optimizer()
text_format.Merge(optimizer_text_proto, optimizer_proto)
optimizer, _ = optimizer_builder.build(optimizer_proto)
self.assertTrue(isinstance(optimizer, tf.train.AdamOptimizer))
def testBuildMomentumOptimizer(self):
optimizer_text_proto = """
momentum_optimizer: {
learning_rate: {
constant_learning_rate {
learning_rate: 0.001
}
}
momentum_optimizer_value: 0.99
}
use_moving_average: false
"""
optimizer_proto = optimizer_pb2.Optimizer()
text_format.Merge(optimizer_text_proto, optimizer_proto)
optimizer, _ = optimizer_builder.build(optimizer_proto)
self.assertTrue(isinstance(optimizer, tf.train.MomentumOptimizer))
def testBuildMovingAverageOptimizerWithNonDefaultDecay(self):
optimizer_text_proto = """
adam_optimizer: {
learning_rate: {
constant_learning_rate {
learning_rate: 0.002
}
}
}
use_moving_average: True
moving_average_decay: 0.2
"""
optimizer_proto = optimizer_pb2.Optimizer()
text_format.Merge(optimizer_text_proto, optimizer_proto)
optimizer, _ = optimizer_builder.build(optimizer_proto)
self.assertTrue(
isinstance(optimizer, tf.contrib.opt.MovingAverageOptimizer))
# TODO(rathodv): Find a way to not depend on the private members.
self.assertAlmostEqual(optimizer._ema._decay, 0.2)
def testBuildRMSPropOptimizer(self):
optimizer_text_proto = """
rms_prop_optimizer: {
learning_rate: {
exponential_decay_learning_rate {
initial_learning_rate: 0.004
decay_steps: 800720
decay_factor: 0.95
}
}
momentum_optimizer_value: 0.9
decay: 0.9
epsilon: 1.0
}
use_moving_average: false
"""
optimizer_proto = optimizer_pb2.Optimizer()
text_format.Merge(optimizer_text_proto, optimizer_proto)
optimizer, _ = optimizer_builder.build(optimizer_proto)
self.assertTrue(isinstance(optimizer, tf.train.RMSPropOptimizer))
def model_fn(features, labels, mode, params=None):
"""Constructs the object detection model.
Args:
features: Dictionary of feature tensors, returned from `input_fn`.
labels: Dictionary of groundtruth tensors if mode is TRAIN or EVAL,
otherwise None.
mode: Mode key from tf.estimator.ModeKeys.
params: Parameter dictionary passed from the estimator.
Returns:
An `EstimatorSpec` that encapsulates the model and its serving
configurations.
"""
params = params or {}
total_loss, train_op, detections, export_outputs = None, None, None, None
is_training = mode == tf.estimator.ModeKeys.TRAIN
# Make sure to set the Keras learning phase. True during training,
# False for inference.
tf.keras.backend.set_learning_phase(is_training)
detection_model = detection_model_fn(is_training=is_training,
add_summaries=(not use_tpu))
scaffold_fn = None
if mode == tf.estimator.ModeKeys.TRAIN:
labels = unstack_batch(labels,
unpad_groundtruth_tensors=train_config.
unpad_groundtruth_tensors)
elif mode == tf.estimator.ModeKeys.EVAL:
# For evaling on train data, it is necessary to check whether groundtruth
# must be unpadded.
boxes_shape = (labels[fields.InputDataFields.groundtruth_boxes].
get_shape().as_list())
unpad_groundtruth_tensors = True if boxes_shape[
1] is not None else False
labels = unstack_batch(
labels, unpad_groundtruth_tensors=unpad_groundtruth_tensors)
if mode in (tf.estimator.ModeKeys.TRAIN, tf.estimator.ModeKeys.EVAL):
gt_boxes_list = labels[fields.InputDataFields.groundtruth_boxes]
gt_classes_list = labels[
fields.InputDataFields.groundtruth_classes]
gt_masks_list = None
if fields.InputDataFields.groundtruth_instance_masks in labels:
gt_masks_list = labels[
fields.InputDataFields.groundtruth_instance_masks]
gt_keypoints_list = None
if fields.InputDataFields.groundtruth_keypoints in labels:
gt_keypoints_list = labels[
fields.InputDataFields.groundtruth_keypoints]
if fields.InputDataFields.groundtruth_is_crowd in labels:
gt_is_crowd_list = labels[
fields.InputDataFields.groundtruth_is_crowd]
detection_model.provide_groundtruth(
groundtruth_boxes_list=gt_boxes_list,
groundtruth_classes_list=gt_classes_list,
groundtruth_masks_list=gt_masks_list,
groundtruth_keypoints_list=gt_keypoints_list,
groundtruth_weights_list=labels[
fields.InputDataFields.groundtruth_weights],
groundtruth_is_crowd_list=gt_is_crowd_list)
preprocessed_images = features[fields.InputDataFields.image]
prediction_dict = detection_model.observe(
preprocessed_images,
features[fields.InputDataFields.true_image_shape])
if mode in (tf.estimator.ModeKeys.EVAL, tf.estimator.ModeKeys.PREDICT):
detections = detection_model.postprocess(
prediction_dict,
features[fields.InputDataFields.true_image_shape])
if mode == tf.estimator.ModeKeys.TRAIN:
if train_config.fine_tune_checkpoint and hparams.load_pretrained:
if not train_config.fine_tune_checkpoint_type:
# train_config.from_detection_checkpoint field is deprecated. For
# backward compatibility, set train_config.fine_tune_checkpoint_type
# based on train_config.from_detection_checkpoint.
if train_config.from_detection_checkpoint:
train_config.fine_tune_checkpoint_type = 'detection'
else:
train_config.fine_tune_checkpoint_type = 'classification'
asg_map = detection_model.restore_map(
fine_tune_checkpoint_type=train_config.
fine_tune_checkpoint_type,
load_all_detection_checkpoint_vars=(
train_config.load_all_detection_checkpoint_vars))
available_var_map = (
variables_helper.get_variables_available_in_checkpoint(
asg_map,
train_config.fine_tune_checkpoint,
include_global_step=False))
if use_tpu:
def tpu_scaffold():
tf.train.init_from_checkpoint(
train_config.fine_tune_checkpoint,
available_var_map)
return tf.train.Scaffold()
scaffold_fn = tpu_scaffold
else:
tf.train.init_from_checkpoint(
train_config.fine_tune_checkpoint, available_var_map)
if mode in (tf.estimator.ModeKeys.TRAIN, tf.estimator.ModeKeys.EVAL):
losses_dict = detection_model.loss(
prediction_dict,
features[fields.InputDataFields.true_image_shape])
losses = [loss_tensor for loss_tensor in losses_dict.values()]
if train_config.add_regularization_loss:
regularization_losses = tf.get_collection(
tf.GraphKeys.REGULARIZATION_LOSSES)
if regularization_losses:
regularization_loss = tf.add_n(regularization_losses,
name='regularization_loss')
losses.append(regularization_loss)
losses_dict[
'Loss/regularization_loss'] = regularization_loss
total_loss = tf.add_n(losses, name='total_loss')
losses_dict['Loss/total_loss'] = total_loss
if 'graph_rewriter_config' in configs:
graph_rewriter_fn = graph_rewriter_builder.build(
configs['graph_rewriter_config'], is_training=is_training)
graph_rewriter_fn()
# TODO(rathodv): Stop creating optimizer summary vars in EVAL mode once we
# can write learning rate summaries on TPU without host calls.
global_step = tf.train.get_or_create_global_step()
training_optimizer, optimizer_summary_vars = optimizer_builder.build(
train_config.optimizer)
if mode == tf.estimator.ModeKeys.TRAIN:
if use_tpu:
training_optimizer = tf.contrib.tpu.CrossShardOptimizer(
training_optimizer)
# Optionally freeze some layers by setting their gradients to be zero.
trainable_variables = None
if train_config.freeze_variables:
trainable_variables = tf.contrib.framework.filter_variables(
tf.trainable_variables(),
exclude_patterns=train_config.freeze_variables)
clip_gradients_value = None
if train_config.gradient_clipping_by_norm > 0:
clip_gradients_value = train_config.gradient_clipping_by_norm
if not use_tpu:
for var in optimizer_summary_vars:
tf.summary.scalar(var.op.name, var)
summaries = [] if use_tpu else None
train_op = tf.contrib.layers.optimize_loss(
loss=total_loss,
global_step=global_step,
learning_rate=None,
clip_gradients=clip_gradients_value,
optimizer=training_optimizer,
variables=trainable_variables,
summaries=summaries,
name='') # Preventing scope prefix on all variables.
if mode == tf.estimator.ModeKeys.PREDICT:
export_outputs = {
tf.saved_model.signature_constants.PREDICT_METHOD_NAME:
tf.estimator.export.PredictOutput(detections)
}
eval_metric_ops = None
scaffold = None
if mode == tf.estimator.ModeKeys.EVAL:
class_agnostic = (fields.DetectionResultFields.detection_classes
not in detections)
groundtruth = _prepare_groundtruth_for_eval(
detection_model, class_agnostic)
use_original_images = fields.InputDataFields.original_image in features
eval_images = (features[fields.InputDataFields.original_image]
if use_original_images else
features[fields.InputDataFields.image])
eval_dict = eval_util.result_dict_for_single_example(
eval_images[0:1],
features[inputs.HASH_KEY][0],
detections,
groundtruth,
class_agnostic=class_agnostic,
scale_to_absolute=True)
if class_agnostic:
category_index = label_map_util.create_class_agnostic_category_index(
)
else:
category_index = label_map_util.create_category_index_from_labelmap(
eval_input_config.label_map_path)
img_summary = None
if not use_tpu and use_original_images:
detection_and_groundtruth = (
vis_utils.draw_side_by_side_evaluation_image(
eval_dict,
category_index,
max_boxes_to_draw=20,
min_score_thresh=0.2,
use_normalized_coordinates=False))
img_summary = tf.summary.image(
'Detections_Left_Groundtruth_Right',
detection_and_groundtruth)
# Eval metrics on a single example.
eval_metrics = eval_config.metrics_set
if not eval_metrics:
eval_metrics = ['coco_detection_metrics']
eval_metric_ops = eval_util.get_eval_metric_ops_for_evaluators(
eval_metrics,
category_index.values(),
eval_dict,
include_metrics_per_category=eval_config.
include_metrics_per_category)
for loss_key, loss_tensor in iter(losses_dict.items()):
eval_metric_ops[loss_key] = tf.metrics.mean(loss_tensor)
for var in optimizer_summary_vars:
eval_metric_ops[var.op.name] = (var, tf.no_op())
if img_summary is not None:
eval_metric_ops['Detections_Left_Groundtruth_Right'] = (
img_summary, tf.no_op())
eval_metric_ops = {
str(k): v
for k, v in eval_metric_ops.iteritems()
}
if eval_config.use_moving_averages:
variable_averages = tf.train.ExponentialMovingAverage(0.0)
variables_to_restore = variable_averages.variables_to_restore()
keep_checkpoint_every_n_hours = (
train_config.keep_checkpoint_every_n_hours)
saver = tf.train.Saver(
variables_to_restore,
keep_checkpoint_every_n_hours=keep_checkpoint_every_n_hours
)
scaffold = tf.train.Scaffold(saver=saver)
# EVAL executes on CPU, so use regular non-TPU EstimatorSpec.
if use_tpu and mode != tf.estimator.ModeKeys.EVAL:
return tf.contrib.tpu.TPUEstimatorSpec(
mode=mode,
scaffold_fn=scaffold_fn,
predictions=detections,
loss=total_loss,
train_op=train_op,
eval_metrics=eval_metric_ops,
export_outputs=export_outputs)
else:
return tf.estimator.EstimatorSpec(mode=mode,
predictions=detections,
loss=total_loss,
train_op=train_op,
eval_metric_ops=eval_metric_ops,
export_outputs=export_outputs,
scaffold=scaffold)
def train(create_tensor_dict_fn,
create_model_fn,
train_config,
master,
task,
num_clones,
worker_replicas,
clone_on_cpu,
ps_tasks,
worker_job_name,
is_chief,
train_dir,
graph_hook_fn=None):
"""Training function for detection models.
Args:
create_tensor_dict_fn: a function to create a tensor input dictionary.
create_model_fn: a function that creates a DetectionModel and generates
losses.
train_config: a train_pb2.TrainConfig protobuf.
master: BNS name of the TensorFlow master to use.
task: The task id of this training instance.
num_clones: The number of clones to run per machine.
worker_replicas: The number of work replicas to train with.
clone_on_cpu: True if clones should be forced to run on CPU.
ps_tasks: Number of parameter server tasks.
worker_job_name: Name of the worker job.
is_chief: Whether this replica is the chief replica.
train_dir: Directory to write checkpoints and training summaries to.
graph_hook_fn: Optional function that is called after the inference graph is
built (before optimization). This is helpful to perform additional changes
to the training graph such as adding FakeQuant ops. The function should
modify the default graph.
Raises:
ValueError: If both num_clones > 1 and train_config.sync_replicas is true.
"""
detection_model = create_model_fn()
data_augmentation_options = [
preprocessor_builder.build(step)
for step in train_config.data_augmentation_options
]
with tf.Graph().as_default():
# Build a configuration specifying multi-GPU and multi-replicas.
deploy_config = model_deploy.DeploymentConfig(
num_clones=num_clones,
clone_on_cpu=clone_on_cpu,
replica_id=task,
num_replicas=worker_replicas,
num_ps_tasks=ps_tasks,
worker_job_name=worker_job_name)
# Place the global step on the device storing the variables.
with tf.device(deploy_config.variables_device()):
global_step = slim.create_global_step()
if num_clones != 1 and train_config.sync_replicas:
raise ValueError('In Synchronous SGD mode num_clones must ',
'be 1. Found num_clones: {}'.format(num_clones))
batch_size = train_config.batch_size // num_clones
if train_config.sync_replicas:
batch_size //= train_config.replicas_to_aggregate
with tf.device(deploy_config.inputs_device()):
input_queue = create_input_queue(
batch_size, create_tensor_dict_fn,
train_config.batch_queue_capacity,
train_config.num_batch_queue_threads,
train_config.prefetch_queue_capacity,
data_augmentation_options)
# Gather initial summaries.
# TODO(rathodv): See if summaries can be added/extracted from global tf
# collections so that they don't have to be passed around.
summaries = set(tf.get_collection(tf.GraphKeys.SUMMARIES))
global_summaries = set([])
model_fn = functools.partial(_create_losses,
create_model_fn=create_model_fn,
train_config=train_config)
clones = model_deploy.create_clones(deploy_config, model_fn,
[input_queue])
first_clone_scope = clones[0].scope
if graph_hook_fn:
with tf.device(deploy_config.variables_device()):
graph_hook_fn()
# Gather update_ops from the first clone. These contain, for example,
# the updates for the batch_norm variables created by model_fn.
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS,
first_clone_scope)
with tf.device(deploy_config.optimizer_device()):
training_optimizer, optimizer_summary_vars = optimizer_builder.build(
train_config.optimizer)
for var in optimizer_summary_vars:
tf.summary.scalar(var.op.name, var, family='LearningRate')
sync_optimizer = None
if train_config.sync_replicas:
training_optimizer = tf.train.SyncReplicasOptimizer(
training_optimizer,
replicas_to_aggregate=train_config.replicas_to_aggregate,
total_num_replicas=worker_replicas)
sync_optimizer = training_optimizer
with tf.device(deploy_config.optimizer_device()):
regularization_losses = (
None if train_config.add_regularization_loss else [])
total_loss, grads_and_vars = model_deploy.optimize_clones(
clones,
training_optimizer,
regularization_losses=regularization_losses)
total_loss = tf.check_numerics(total_loss,
'LossTensor is inf or nan.')
# Optionally multiply bias gradients by train_config.bias_grad_multiplier.
if train_config.bias_grad_multiplier:
biases_regex_list = ['.*/biases']
grads_and_vars = variables_helper.multiply_gradients_matching_regex(
grads_and_vars,
biases_regex_list,
multiplier=train_config.bias_grad_multiplier)
# Optionally freeze some layers by setting their gradients to be zero.
if train_config.freeze_variables:
grads_and_vars = variables_helper.freeze_gradients_matching_regex(
grads_and_vars, train_config.freeze_variables)
# Optionally clip gradients
if train_config.gradient_clipping_by_norm > 0:
with tf.name_scope('clip_grads'):
grads_and_vars = slim.learning.clip_gradient_norms(
grads_and_vars, train_config.gradient_clipping_by_norm)
# Create gradient updates.
grad_updates = training_optimizer.apply_gradients(
grads_and_vars, global_step=global_step)
update_ops.append(grad_updates)
update_op = tf.group(*update_ops, name='update_barrier')
with tf.control_dependencies([update_op]):
train_tensor = tf.identity(total_loss, name='train_op')
# Add summaries.
for model_var in slim.get_model_variables():
global_summaries.add(
tf.summary.histogram('ModelVars/' + model_var.op.name,
model_var))
for loss_tensor in tf.losses.get_losses():
global_summaries.add(
tf.summary.scalar('Losses/' + loss_tensor.op.name,
loss_tensor))
global_summaries.add(
tf.summary.scalar('Losses/TotalLoss', tf.losses.get_total_loss()))
# Add the summaries from the first clone. These contain the summaries
# created by model_fn and either optimize_clones() or _gather_clone_loss().
summaries |= set(
tf.get_collection(tf.GraphKeys.SUMMARIES, first_clone_scope))
summaries |= global_summaries
# Merge all summaries together.
summary_op = tf.summary.merge(list(summaries), name='summary_op')
# Soft placement allows placing on CPU ops without GPU implementation.
session_config = tf.ConfigProto(allow_soft_placement=True,
log_device_placement=False)
# Save checkpoints regularly.
keep_checkpoint_every_n_hours = train_config.keep_checkpoint_every_n_hours
saver = tf.train.Saver(
keep_checkpoint_every_n_hours=keep_checkpoint_every_n_hours)
# Create ops required to initialize the model from a given checkpoint.
init_fn = None
if train_config.fine_tune_checkpoint:
if not train_config.fine_tune_checkpoint_type:
# train_config.from_detection_checkpoint field is deprecated. For
# backward compatibility, fine_tune_checkpoint_type is set based on
# from_detection_checkpoint.
if train_config.from_detection_checkpoint:
train_config.fine_tune_checkpoint_type = 'detection'
else:
train_config.fine_tune_checkpoint_type = 'classification'
var_map = detection_model.restore_map(
fine_tune_checkpoint_type=train_config.
fine_tune_checkpoint_type,
load_all_detection_checkpoint_vars=(
train_config.load_all_detection_checkpoint_vars))
available_var_map = (
variables_helper.get_variables_available_in_checkpoint(
var_map,
train_config.fine_tune_checkpoint,
include_global_step=False))
init_saver = tf.train.Saver(available_var_map)
def initializer_fn(sess):
init_saver.restore(sess, train_config.fine_tune_checkpoint)
init_fn = initializer_fn
slim.learning.train(
train_tensor,
logdir=train_dir,
master=master,
is_chief=is_chief,
session_config=session_config,
startup_delay_steps=train_config.startup_delay_steps,
init_fn=init_fn,
summary_op=summary_op,
number_of_steps=(train_config.num_steps
if train_config.num_steps else None),
save_summaries_secs=120,
sync_optimizer=sync_optimizer,
saver=saver)