def main(_):
with tf.Graph().as_default():
# Create inputs in [0, 1], as expected by vgg_16.
inputs, _ = image_utils.imagenet_inputs(FLAGS.batch_size,
FLAGS.image_size)
evaluation_images = image_utils.load_evaluation_images(
FLAGS.image_size)
# Process style and weight flags
if FLAGS.style_coefficients is None:
style_coefficients = [1.0 for _ in range(FLAGS.num_styles)]
else:
style_coefficients = ast.literal_eval(FLAGS.style_coefficients)
if len(style_coefficients) != FLAGS.num_styles:
raise ValueError(
'number of style coefficients differs from number of styles')
content_weights = ast.literal_eval(FLAGS.content_weights)
style_weights = ast.literal_eval(FLAGS.style_weights)
# Load style images.
style_images, labels, style_gram_matrices = image_utils.style_image_inputs(
os.path.expanduser(FLAGS.style_dataset_file),
batch_size=FLAGS.num_styles,
image_size=FLAGS.image_size,
square_crop=True,
shuffle=False)
labels = tf.unstack(labels)
def _create_normalizer_params(style_label):
"""Creates normalizer parameters from a style label."""
return {
'labels': tf.expand_dims(style_label, 0),
'num_categories': FLAGS.num_styles,
'center': True,
'scale': True
}
# Dummy call to simplify the reuse logic
model.transform(inputs,
reuse=False,
normalizer_params=_create_normalizer_params(labels[0]))
def _style_sweep(inputs):
"""Transfers all styles onto the input one at a time."""
inputs = tf.expand_dims(inputs, 0)
stylized_inputs = [
model.transform(
inputs,
reuse=True,
normalizer_params=_create_normalizer_params(style_label))
for _, style_label in enumerate(labels)
]
return tf.concat(0, [inputs] + stylized_inputs)
if FLAGS.style_grid:
style_row = tf.concat(0, [
tf.ones([1, FLAGS.image_size, FLAGS.image_size, 3]),
style_images
])
stylized_training_example = _style_sweep(inputs[0])
stylized_evaluation_images = [
_style_sweep(image) for image in tf.unstack(evaluation_images)
]
stylized_noise = _style_sweep(
tf.random_uniform([FLAGS.image_size, FLAGS.image_size, 3]))
stylized_style_images = [
_style_sweep(image) for image in tf.unstack(style_images)
]
if FLAGS.style_crossover:
grid = tf.concat(
0, [style_row, stylized_training_example, stylized_noise] +
stylized_evaluation_images + stylized_style_images)
else:
grid = tf.concat(
0, [style_row, stylized_training_example, stylized_noise] +
stylized_evaluation_images)
tf.image_summary(
'Style Grid',
tf.cast(
image_utils.form_image_grid(grid, ([
3 + evaluation_images.get_shape().as_list()[0] +
FLAGS.num_styles, 1 + FLAGS.num_styles
] if FLAGS.style_crossover else [
3 + evaluation_images.get_shape().as_list()[0], 1 +
FLAGS.num_styles
]), [FLAGS.image_size, FLAGS.image_size], 3) * 255.0,
tf.uint8))
if FLAGS.learning_curves:
metrics = {}
for i, label in enumerate(labels):
gram_matrices = dict([
(key, value[i:i + 1])
for key, value in style_gram_matrices.iteritems()
])
stylized_inputs = model.transform(
inputs,
reuse=True,
normalizer_params=_create_normalizer_params(label))
_, loss_dict = learning.total_loss(inputs,
stylized_inputs,
gram_matrices,
content_weights,
style_weights,
reuse=i > 0)
for key, value in loss_dict.iteritems():
metrics['{}_style_{}'.format(
key, i)] = slim.metrics.streaming_mean(value)
names_values, names_updates = slim.metrics.aggregate_metric_map(
metrics)
for name, value in names_values.iteritems():
summary_op = tf.scalar_summary(name, value, [])
print_op = tf.Print(summary_op, [value], name)
tf.add_to_collection(tf.GraphKeys.SUMMARIES, print_op)
eval_op = names_updates.values()
num_evals = FLAGS.num_evals
else:
eval_op = None
num_evals = 1
slim.evaluation.evaluation_loop(
master=FLAGS.master,
checkpoint_dir=os.path.expanduser(FLAGS.train_dir),
logdir=os.path.expanduser(FLAGS.eval_dir),
eval_op=eval_op,
num_evals=num_evals,
eval_interval_secs=FLAGS.eval_interval_secs)
def main(unused_argv=None):
with tf.Graph().as_default():
# Force all input processing onto CPU in order to reserve the GPU for the
# forward inference and back-propagation.
device = '/cpu:0' if not FLAGS.ps_tasks else '/job:worker/cpu:0'
with tf.device(
tf.train.replica_device_setter(FLAGS.ps_tasks,
worker_device=device)):
inputs, _ = image_utils.imagenet_inputs(FLAGS.batch_size,
FLAGS.image_size)
# Load style images and select one at random (for each graph execution, a
# new random selection occurs)
_, style_labels, style_gram_matrices = image_utils.style_image_inputs(
os.path.expanduser(FLAGS.style_dataset_file),
batch_size=FLAGS.batch_size,
image_size=FLAGS.image_size,
square_crop=True,
shuffle=True)
with tf.device(tf.train.replica_device_setter(FLAGS.ps_tasks)):
# Process style and weight flags
num_styles = FLAGS.num_styles
if FLAGS.style_coefficients is None:
style_coefficients = [1.0 for _ in range(num_styles)]
else:
style_coefficients = ast.literal_eval(FLAGS.style_coefficients)
if len(style_coefficients) != num_styles:
raise ValueError(
'number of style coefficients differs from number of styles'
)
content_weights = ast.literal_eval(FLAGS.content_weights)
style_weights = ast.literal_eval(FLAGS.style_weights)
# Rescale style weights dynamically based on the current style image
style_coefficient = tf.gather(tf.constant(style_coefficients),
style_labels)
style_weights = dict((key, style_coefficient * value)
for key, value in style_weights.iteritems())
# Define the model
stylized_inputs = model.transform(inputs,
normalizer_params={
'labels': style_labels,
'num_categories': num_styles,
'center': True,
'scale': True
})
# Compute losses.
total_loss, loss_dict = learning.total_loss(
inputs, stylized_inputs, style_gram_matrices, content_weights,
style_weights)
for key, value in loss_dict.iteritems():
tf.summary.scalar(key, value)
# Set up training
optimizer = tf.train.AdamOptimizer(FLAGS.learning_rate)
train_op = slim.learning.create_train_op(
total_loss,
optimizer,
clip_gradient_norm=FLAGS.clip_gradient_norm,
summarize_gradients=False)
# Function to restore VGG16 parameters
# TODO(iansimon): This is ugly, but assign_from_checkpoint_fn doesn't
# exist yet.
saver = tf.train.Saver(slim.get_variables('vgg_16'))
def init_fn(session):
saver.restore(session, vgg.checkpoint_file())
# Run training
slim.learning.train(train_op=train_op,
logdir=os.path.expanduser(FLAGS.train_dir),
master=FLAGS.master,
is_chief=FLAGS.task == 0,
number_of_steps=FLAGS.train_steps,
init_fn=init_fn,
save_summaries_secs=FLAGS.save_summaries_secs,
save_interval_secs=FLAGS.save_interval_secs)
