def create_objective(self, head_labels, lateral_labels, mode='LS'):
with tf.name_scope('cyclic'):
self.s2t_cyclic_loss = losses.cyclic_loss(self.summary['source_image'], self.s2t2s)
self.t2s_cyclic_loss = losses.cyclic_loss(self.summary['target_image'], self.t2s2t)
self.summary['source_cyclic_loss'] = self.s2t_cyclic_loss
self.summary['target_cyclic_loss'] = self.t2s_cyclic_loss
# Wasserstein with gradient-penalty
with tf.name_scope('adversarial'):
self.s2t_adversarial_loss = losses.adversarial_loss(self.summary['target_image'], self.g_s2t, self.target_real, self.s2t_fake, mode=mode, discriminator=self.discriminator, discriminator_name='D_S2T')
self.t2s_adversarial_loss = losses.adversarial_loss(self.summary['source_image'], self.g_t2s, self.source_real, self.t2s_fake, mode=mode, discriminator=self.discriminator, discriminator_name='D_T2S')
self.summary['s2t_g_loss'] = self.s2t_adversarial_loss[0]
self.summary['t2s_g_loss'] = self.t2s_adversarial_loss[0]
self.summary['s2t_d_loss'] = self.s2t_adversarial_loss[1]
self.summary['t2s_d_loss'] = self.t2s_adversarial_loss[1]
with tf.name_scope('style'):
self.s2t_style_loss = losses.style_loss(self.s2t_fake_activations, self.target_real_activations, self.style_weights)
self.t2s_style_loss = losses.style_loss(self.t2s_fake_activations, self.source_real_activations, self.style_weights)
self.summary['s2t_style_loss'] = self.s2t_style_loss
self.summary['t2s_style_loss'] = self.t2s_style_loss
with tf.name_scope('task'):
self.transferred_task_loss = losses.task_classifier_pixel_da_loss(head_labels, lateral_labels, self.head_logits, self.lateral_logits)
self.summary['task_loss'] = self.transferred_task_loss
if self.t2s_task:
self.t2s_task_loss = losses.task_classifier_pixel_da_loss(head_labels, lateral_labels, self.t2s_head_logits, self.t2s_lateral_logits)
self.summary['t2s_task_loss'] = self.t2s_task_loss
def create_objective(self, steer, command, mode='FISHER'):
if not self.source_only:
with tf.name_scope('cyclic'):
if self.generator_out_channel == 9:
self.s2t_cyclic_loss = losses.cyclic_loss(
self.summary['source_image'], self.s2t2s)
self.t2s_cyclic_loss = losses.cyclic_loss(
self.summary['target_image'], self.t2s2t)
else:
self.s2t_cyclic_loss = losses.cyclic_loss(
self.source_concat, self.s2t2s)
self.t2s_cyclic_loss = losses.cyclic_loss(
self.target_concat, self.t2s2t)
self.summary['source_cyclic_loss'] = self.s2t_cyclic_loss
self.summary['target_cyclic_loss'] = self.t2s_cyclic_loss
# Wasserstein with gradient-penalty
with tf.name_scope('adversarial'):
self.s2t_adversarial_loss = losses.adversarial_loss(
None,
None,
self.target_real,
self.s2t_fake,
mode=mode,
discriminator=self.discriminator,
discriminator_name='D_S2T',
patch=self.patch)
self.t2s_adversarial_loss = losses.adversarial_loss(
None,
None,
self.target_real,
self.s2t_fake,
mode=mode,
discriminator=self.discriminator,
discriminator_name='D_T2S',
patch=self.patch)
self.summary['s2t_g_loss'] = self.s2t_adversarial_loss[0]
self.summary['t2s_g_loss'] = self.t2s_adversarial_loss[0]
self.summary['s2t_d_loss'] = self.s2t_adversarial_loss[1]
self.summary['t2s_d_loss'] = self.t2s_adversarial_loss[1]
with tf.name_scope('style'):
self.s2t_style_loss = losses.style_loss(
self.s2t_fake_activations, self.target_real_activations,
self.style_weights)
self.t2s_style_loss = losses.style_loss(
self.t2s_fake_activations, self.source_real_activations,
self.style_weights)
self.summary['s2t_style_loss'] = self.s2t_style_loss
self.summary['t2s_style_loss'] = self.t2s_style_loss
with tf.name_scope('task'):
self.task_loss, _ = losses.task_classifier_loss(
steer, command, self.end)
self.summary['task_loss'] = self.task_loss
if self.t2s_task:
self.t2s_task_loss, _ = losses.task_classifier_loss(
steer, command, self.t2s_end)
self.summary['t2s_task_loss'] = self.t2s_task_loss
def total_loss(combination_image, base_image, style_image):
input_tensor = tf.concat([base_image, style_image, combination_image],
axis=0)
features = feature_model(input_tensor)
# Initialize the loss
loss = tf.zeros(shape=())
layer_features = features[content_layer_name]
content_image_features = layer_features[0, :, :, :]
combination_features = layer_features[2, :, :, :]
loss = loss + CONTENT_WEIGHT * content_loss(content_image_features,
combination_features)
for layer_name in style_layer_names:
layer_features = features[layer_name]
style_features = layer_features[1, :, :, :]
combination_features = layer_features[2, :, :, :]
sl = style_loss(style_features,
combination_features,
size=image_height * image_width)
loss += (STYLE_WEIGHT / len(style_layer_names)) * sl
loss += TV_WEIGHT * \
total_variation_loss(combination_image, image_height, image_width)
return loss
def main(argv=None):
network_fn = nets_factory.get_network_fn('vgg_16',
num_classes=1,
is_training=False)
image_preprocessing_fn, image_unprocessing_fn = preprocessing_factory.get_preprocessing(
'vgg_16', is_training=False)
preprocess_content_image = reader.get_image(FLAGS.CONTENT_IMAGE,
FLAGS.IMAGE_SIZE)
# add bath for vgg net training
preprocess_content_image = tf.expand_dims(preprocess_content_image, 0)
_, endpoints_dict = network_fn(preprocess_content_image,
spatial_squeeze=False)
# Log the structure of loss network
tf.logging.info(
'Loss network layers(You can define them in "content_layers" and "style_layers"):'
)
for key in endpoints_dict:
tf.logging.info(key)
"""Build Losses"""
# style_features_t = losses.get_style_features(endpoints_dict, FLAGS.STYLE_LAYERS)
content_loss, generaged_image = losses.content_loss(
endpoints_dict, FLAGS.CONTENT_LAYERS, FLAGS.CONTENT_IMAGE)
style_loss, style_loss_summary = losses.style_loss(endpoints_dict,
FLAGS.style_layers,
FLAGS.STYLE_IMAGE)
tv_loss = losses.total_variation_loss(
generaged_image) # use the unprocessed image
loss = FLAGS.STYLE_WEIGHT * style_loss + FLAGS.CONTENT_WEIGHT * content_loss + FLAGS.TV_WEIGHT * tv_loss
train_op = tf.train.AdamOptimizer(FLAGS.LEARNING_RATE).minimize(loss)
output_image = tf.image.encode_png(
tf.saturate_cast(
tf.squeeze(generaged_image) + reader.mean_pixel, tf.uint8))
with tf.Session() as sess:
sess.run(tf.initialize_all_variables())
start_time = time.time()
for step in range(FLAGS.NUM_ITERATIONS):
_, loss_t, cl, sl = sess.run(
[train_op, loss, content_loss, style_loss])
elapsed = time.time() - start_time
start_time = time.time()
print(step, elapsed, loss_t, cl, sl)
image_t = sess.run(output_image)
with open('out.png', 'wb') as f:
f.write(image_t)
def _total_style_loss(sess, network, style, config: ArtistConfig):
sess.run(network['input'].assign(style))
loss = 0.
if config.verbose:
print('Style Layer: ')
for indx, w in zip(config.style_layers, config.style_layer_weights):
if config.verbose:
print(f'\t{list(network.keys())[indx]}')
a = tf.convert_to_tensor(
sess.run(network[list(network.keys())[indx]]))
x = network[list(network.keys())[indx]]
loss += style_loss(a, x)
loss /= float(len(config.style_layer_weights))
return loss
def main():
# Make sure the training path exists.
training_path = 'models/log/'
if not (os.path.exists(training_path)):
os.makedirs(training_path)
style_features = get_style_feature()
with tf.Graph().as_default():
train_image = reader.get_train_image(batch_size, image_size,
image_size, dataset_path)
generated = model.net(train_image)
processed_generated = [
reader.prepose_image(image, image_size, image_size)
for image in tf.unstack(generated, axis=0, num=batch_size)
]
processed_generated = tf.stack(processed_generated)
net = model.load_model(
tf.concat([processed_generated, train_image], 0), vgg16_ckpt_path)
with tf.Session() as sess:
"""Build Losses"""
content_loss = losses.content_loss(net, content_layers)
style_loss, style_loss_summary = losses.style_loss(
net, style_features, style_layers)
tv_loss = losses.total_variation_loss(
generated) # use the unprocessed image
loss = style_weight * style_loss + content_weight * content_loss + tv_weight * tv_loss
# Add Summary for visualization in tensorboard.
"""Add Summary"""
tf.summary.scalar('losses/content_loss', content_loss)
tf.summary.scalar('losses/style_loss', style_loss)
tf.summary.scalar('losses/regularizer_loss', tv_loss)
tf.summary.scalar('weighted_losses/weighted_content_loss',
content_loss * content_weight)
tf.summary.scalar('weighted_losses/weighted_style_loss',
style_loss * style_weight)
tf.summary.scalar('weighted_losses/weighted_regularizer_loss',
tv_loss * tv_weight)
tf.summary.scalar('total_loss', loss)
for layer in style_layers:
tf.summary.scalar('style_losses/' + layer,
style_loss_summary[layer])
tf.summary.image('generated', generated)
tf.summary.image(
'origin',
tf.stack([
reader.mean_add(image) for image in tf.unstack(
train_image, axis=0, num=batch_size)
]))
summary = tf.summary.merge_all()
writer = tf.summary.FileWriter(training_path)
"""Prepare to Train"""
global_step = tf.Variable(0, name="global_step", trainable=False)
train_op = tf.train.AdamOptimizer(1e-3).minimize(
loss,
global_step=global_step,
var_list=tf.trainable_variables())
saver = tf.train.Saver(tf.trainable_variables())
sess.run([
tf.global_variables_initializer(),
tf.local_variables_initializer()
])
# Restore variables for training model if the checkpoint file exists.
last_file = tf.train.latest_checkpoint(training_path)
if last_file:
tf.logging.info('Restoring model from {}'.format(last_file))
saver.restore(sess, last_file)
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
start_time = time.time()
try:
while not coord.should_stop():
_, loss_t, step = sess.run([train_op, loss, global_step])
loss_c, loss_s = sess.run([content_loss, style_loss])
elapsed_time = time.time() - start_time
start_time = time.time()
"""logging"""
if step % 10 == 0:
print(
'step: %d, content Loss %f, style Loss %f, total Loss %f, secs/step: %f'
% (step, loss_c, loss_s, loss_t, elapsed_time))
"""summary"""
if step % 25 == 0:
print('adding summary...')
summary_str = sess.run(summary)
writer.add_summary(summary_str, step)
writer.flush()
"""checkpoint"""
if step % 1000 == 0:
saver.save(sess,
os.path.join(training_path,
'fast-style-model.ckpt'),
global_step=step)
except tf.errors.OutOfRangeError:
saver.save(
sess,
os.path.join(training_path, 'fast-style-model.ckpt-done'))
print('Done training -- epoch limit reached')
finally:
coord.request_stop()
coord.join(threads)
#layers at which the style loss is to be calculated
feature_layers = [
'block1_conv2', 'block2_conv2', 'block3_conv3', 'block4_conv3',
'block5_conv3'
]
#iterating over the feature layers
for layer_name in feature_layers:
layer_features = output_dict[layer_name]
#style_image_features output at the particular feature layer
style_image_features = layer_features[1, :, :, :]
#combination_image_features output at the particular feature layer
combination_image_features = layer_features[2, :, :, :]
#calculating the style loss
sl = style_loss(style_image_features, combination_image_features,
img_nrows, img_ncols)
loss += (style_weight / len(feature_layers)) * sl
#calculating the total variation loss in the combination image
loss += total_variation_weight * total_variation_loss(combination_image,
img_nrows, img_ncols)
#getting the gradients of the loss w.r.t the pixels of the combination image
grads = K.gradients(loss, combination_image)
outs = [loss]
outs += grads
#instantiating a Keras function
f_outputs = K.function([combination_image], outs)
def solve(Config):
gc.enable()
# get the style feature
style_features = losses.get_style_feature(Config)
# prepare some dirs for use
# tf.reset_default_graph()
model_dir = Config.model_dir
if not osp.exists(model_dir):
os.mkdir(model_dir)
# construct the graph and model
# prepare the dataset
images = Dataset(Config).imagedata_pipelines()
# the trainnet
generated = model.inference_trainnet(images)
# concat the content image and the generated together to save time and feed to the vgg net one time
# preprocess the generated
preprocess_generated = preprocess(generated, Config)
layer_infos = Vgg(Config.feature_path).build(
tf.concat([preprocess_generated, images], 0))
# get the loss
content_loss = losses.content_loss(layer_infos, Config.content_layers)
style_loss = losses.style_loss(layer_infos, Config.style_layers,
style_features)
tv_loss = losses.tv_loss(generated)
loss = Config.style_weight * style_loss + Config.content_weight * content_loss + Config.tv_weight * tv_loss
# train op
global_step = tf.Variable(0, name='global_step', trainable=False)
train_op = tf.train.AdamOptimizer(Config.lr).minimize(
loss, global_step=global_step)
# add summary
with tf.name_scope('losses'):
tf.summary.scalar('content_loss', content_loss)
tf.summary.scalar('style_loss', style_loss)
tf.summary.scalar('tv_loss', tv_loss)
with tf.name_scope('weighted_losses'):
tf.summary.scalar('weighted_content_loss',
content_loss * Config.content_weight)
tf.summary.scalar('weighted_style_loss',
style_loss * Config.style_weight)
tf.summary.scalar('weighted_tv_loss', tv_loss * Config.tv_weight)
tf.summary.scalar('total_loss', loss)
tf.summary.image('generated', generated)
tf.summary.image('original', images)
summary = tf.summary.merge_all()
summary_path = osp.join(model_dir, 'summary')
if not osp.exists(summary_path):
os.mkdir(summary_path)
writer = tf.summary.FileWriter(summary_path)
# the saver loader
saver = tf.train.Saver(tf.global_variables())
#for var in tf.global_variables():
# print var
restore = tf.train.latest_checkpoint(model_dir)
# begin training work
config = tf.ConfigProto()
config.gpu_options.allow_growth = True
with tf.Session(config=config) as sess:
# restore the variables
sess.run([
tf.global_variables_initializer(),
tf.local_variables_initializer()
])
# if we need finetune?
if Config.finetune:
if restore:
print 'restoring model from {}'.format(restore)
saver.restore(sess, restore)
else:
print 'no model exist, from scratch'
# pop the data queue
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(sess=sess, coord=coord)
print 'begin training'
start_time = time.time()
local_time = time.time()
for step in xrange(Config.max_iter + 1):
_, loss_value = sess.run([train_op, loss])
#plt.imshow(np.uint8(gen[0,...]))
if step % Config.display == 0 or step == Config.max_iter:
print "{}[iterations], train loss {}, time consumes {}s".format(
step, loss_value,
time.time() - local_time)
local_time = time.time()
assert not np.isnan(loss_value), 'model with loss nan'
if step != 0 and (step % Config.snapshot == 0
or step == Config.max_iter):
# save the generated to see
print 'adding summary and saving snapshot...'
saver.save(sess,
osp.join(model_dir, 'model.ckpt'),
global_step=step)
summary_str = sess.run(summary)
writer.add_summary(summary_str, global_step=step)
writer.flush()
coord.request_stop()
coord.join(threads)
sess.close()
print 'done, consumes time {}s'.format(time.time() - start_time)
def main(FLAGS):
# 得到风格特征
style_features_t = losses.get_style_features(FLAGS)
# Make sure the training path exists.
training_path = os.path.join(FLAGS.model_path, FLAGS.naming)
if not (os.path.exists(training_path)):
os.makedirs(training_path)
with tf.Graph().as_default():
with tf.Session() as sess:
"""Build Network"""
# 构造vgg网络，按照FLAGS.loss_model中的网络名字，可以在/nets/nets_factory.py 中的networks_map找到对应
network_fn = nets_factory.get_network_fn(FLAGS.loss_model,
num_classes=1,
is_training=False)
# 根据不同网络做不同的预处理
image_preprocessing_fn, image_unprocessing_fn = preprocessing_factory.get_preprocessing(
FLAGS.loss_model, is_training=False)
# 读取一个批次的数据，并且预处理
# 这里的数据你可以不用coco，可以直接给一个包含很多图片的文件夹即可
# 因为coco过于大
processed_images = reader.image(FLAGS.batch_size,
FLAGS.image_height,
FLAGS.image_width,
'F:/CASIA/train_frame/real/',
image_preprocessing_fn,
epochs=FLAGS.epoch)
# 通过生成网络，生成图片，相当于y^
generated = model.net(processed_images, training=True)
# 因为一会要把生成图片喂入到后面vgg进行计算两个损失，所以要先进行预处理
processed_generated = [
image_preprocessing_fn(image, FLAGS.image_height,
FLAGS.image_width) for image in
tf.unstack(generated, axis=0, num=FLAGS.batch_size)
]
# 因为上面是list格式，所以用tf.stack堆叠成tensor
processed_generated = tf.stack(processed_generated)
# 按照batch那一个维度，拼起来，比如原来两个是[batch_size,h,w,c]，concat后变为[2*batch_size,h,w,c]
# 这样一次前向传播把y^ 和y_c的特征都计算出来了
_, endpoints_dict = network_fn(tf.concat(
[processed_generated, processed_images], 0),
spatial_squeeze=False)
# Log the structure of loss network
tf.logging.info(
'Loss network layers(You can define them in "content_layers" and "style_layers"):'
)
for key in endpoints_dict:
tf.logging.info(key)
"""Build Losses"""
# 计算三个损失
content_loss = losses.content_loss(endpoints_dict,
FLAGS.content_layers)
style_loss, style_loss_summary = losses.style_loss(
endpoints_dict, style_features_t, FLAGS.style_layers)
tv_loss = losses.total_variation_loss(
generated) # use the unprocessed image
loss = FLAGS.style_weight * style_loss + FLAGS.content_weight * content_loss + FLAGS.tv_weight * tv_loss
# Add Summary for visualization in tensorboard.
"""Add Summary"""
# 为了tensorboard，可以忽略
tf.summary.scalar('losses/content_loss', content_loss)
tf.summary.scalar('losses/style_loss', style_loss)
tf.summary.scalar('losses/regularizer_loss', tv_loss)
tf.summary.scalar('weighted_losses/weighted_content_loss',
content_loss * FLAGS.content_weight)
tf.summary.scalar('weighted_losses/weighted_style_loss',
style_loss * FLAGS.style_weight)
tf.summary.scalar('weighted_losses/weighted_regularizer_loss',
tv_loss * FLAGS.tv_weight)
tf.summary.scalar('total_loss', loss)
for layer in FLAGS.style_layers:
tf.summary.scalar('style_losses/' + layer,
style_loss_summary[layer])
tf.summary.image('generated', generated)
# tf.image_summary('processed_generated', processed_generated) # May be better?
tf.summary.image(
'origin',
tf.stack([
image_unprocessing_fn(image) for image in tf.unstack(
processed_images, axis=0, num=FLAGS.batch_size)
]))
summary = tf.summary.merge_all()
writer = tf.summary.FileWriter(training_path)
"""Prepare to Train"""
# 步数
global_step = tf.Variable(0, name="global_step", trainable=False)
variable_to_train = []
for variable in tf.trainable_variables():
# 把非vgg网络里面的可训练变量加入variable_to_train
if not (variable.name.startswith(FLAGS.loss_model)):
variable_to_train.append(variable)
# 注意var_list
train_op = tf.train.AdamOptimizer(1e-3).minimize(
loss, global_step=global_step, var_list=variable_to_train)
variables_to_restore = []
for v in tf.global_variables():
# 把非vgg中的可存储变量加入variables_to_restore
if not (v.name.startswith(FLAGS.loss_model)):
variables_to_restore.append(v)
# 注意variables_to_restore
saver = tf.train.Saver(variables_to_restore,
write_version=tf.train.SaverDef.V1)
sess.run([
tf.global_variables_initializer(),
tf.local_variables_initializer()
])
# Restore variables for loss network.
# slim的，可以根据FLAGS里面配置把网络参数加载到sess这个会话里面
init_func = utils._get_init_fn(FLAGS)
init_func(sess)
# Restore variables for training model if the checkpoint file exists.
last_file = tf.train.latest_checkpoint(training_path)
if last_file:
tf.logging.info('Restoring model from {}'.format(last_file))
saver.restore(sess, last_file)
"""Start Training"""
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
start_time = time.time()
try:
while not coord.should_stop():
_, loss_t, step = sess.run([train_op, loss, global_step])
elapsed_time = time.time() - start_time
start_time = time.time()
"""logging"""
print(step)
if step % 10 == 0:
tf.logging.info(
'step: %d, total Loss %f, secs/step: %f' %
(step, loss_t, elapsed_time))
"""summary"""
if step % 25 == 0:
tf.logging.info('adding summary...')
summary_str = sess.run(summary)
writer.add_summary(summary_str, step)
writer.flush()
"""checkpoint"""
if step % 1000 == 0:
saver.save(sess,
os.path.join(training_path,
'fast-style-model.ckpt'),
global_step=step)
except tf.errors.OutOfRangeError:
saver.save(
sess,
os.path.join(training_path, 'fast-style-model.ckpt-done'))
tf.logging.info('Done training -- epoch limit reached')
finally:
coord.request_stop()
coord.join(threads)
def main(unused_agrv=None):
"""main
:param args:
argparse.Namespace object from argparse.parse_args().
"""
# Unpack command-line arguments.
train_dir = FLAGS.train_dir
style_dataset = FLAGS.style_dataset
model_name = FLAGS.model_name
preprocess_size = [FLAGS.image_size, FLAGS.image_size]
batch_size = FLAGS.batch_size
n_epochs = FLAGS.n_epochs
learn_rate = FLAGS.learning_rate
content_weights = FLAGS.content_weights
style_weights = FLAGS.style_weights
num_pipe_buffer = FLAGS.num_pipe_buffer
num_styles = FLAGS.num_styles
train_steps = FLAGS.train_steps
upsample_method = FLAGS.upsample_method
# Setup input pipeline (delegate it to CPU to let GPU handle neural net)
files = tf.train.match_filenames_once(train_dir + '/train-*')
style_files = tf.train.match_filenames_once(style_dataset)
print("style %s" % style_files)
with tf.variable_scope('input_pipe'), tf.device('/cpu:0'):
_, style_labels, style_grams = datapipe.style_batcher(
style_files, batch_size, preprocess_size, n_epochs,
num_pipe_buffer)
batch_op = datapipe.batcher(files, batch_size, preprocess_size,
n_epochs, num_pipe_buffer)
""" Set up weight of style and content image """
content_weights = ast.literal_eval(content_weights)
style_weights = ast.literal_eval(style_weights)
target_grams = []
for name, val in style_weights.iteritems():
target_grams.append(style_grams[name])
# Alter the names to include a namescope that we'll use + output suffix.
loss_style_layers = []
loss_style_weights = []
loss_content_layers = []
loss_content_weights = []
for key, val in style_weights.iteritems():
loss_style_layers.append(key + ':0')
loss_style_weights.append(val)
for key, val in content_weights.iteritems():
loss_content_layers.append(key + ':0')
loss_content_weights.append(val)
# Load in image transformation network into default graph.
shape = [batch_size] + preprocess_size + [3]
with tf.variable_scope('styleNet'):
X = tf.placeholder(tf.float32, shape=shape, name='input')
Y = transform(X, style_labels, num_styles, upsample_method)
print(Y)
# Connect vgg directly to the image transformation network.
with tf.variable_scope('vgg'):
vggnet = vgg16.vgg16(Y)
# Get the gram matrices' tensors for the style loss features.
input_img_grams = losses.get_grams(loss_style_layers)
# Get the tensors for content loss features.
content_layers = losses.get_layers(loss_content_layers)
# Create loss function
content_targets = tuple(
tf.placeholder(tf.float32,
shape=layer.get_shape(),
name='content_input_{}'.format(i))
for i, layer in enumerate(content_layers))
cont_loss = losses.content_loss(content_layers, content_targets,
loss_content_weights)
style_loss = losses.style_loss(input_img_grams, target_grams,
loss_style_weights)
tv_loss = losses.tv_loss(Y)
loss = cont_loss + style_loss + tv_loss
# We do not want to train VGG, so we must grab the subset.
train_vars = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
scope='styleNet')
# Setup step + optimizer
global_step = tf.Variable(0, name='global_step', trainable=False)
optimizer = tf.train.AdamOptimizer(learn_rate).minimize(
loss, global_step, train_vars)
if not os.path.exists('./models'): # Dir that save final models to
os.makedirs('./models')
final_saver = tf.train.Saver(train_vars)
# We must include local variables because of batch pipeline.
init_op = tf.group(tf.global_variables_initializer(),
tf.local_variables_initializer())
# Begin training.
print 'Starting training...'
with tf.Session() as sess:
# Initialization
sess.run(init_op)
vggnet.load_weights(vgg16.checkpoint_file(), sess)
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(sess=sess, coord=coord)
try:
while not coord.should_stop():
current_step = sess.run(global_step)
batch = sess.run(batch_op)
# Collect content targets
content_data = sess.run(content_layers, feed_dict={Y: batch})
feed_dict = {X: batch, content_targets: content_data}
_, loss_out = sess.run([optimizer, loss], feed_dict=feed_dict)
if (current_step % 10 == 0):
print current_step, loss_out
# Throw error if we reach number of steps to break after.
if current_step == train_steps:
print('Done training.')
break
except tf.errors.OutOfRangeError:
print('Done training.')
finally:
# Save the model (the image transformation network) for later usage
# in predict.py
final_saver.save(sess,
'models/' + model_name + '_final.ckpt',
write_meta_graph=False)
coord.request_stop()
coord.join(threads)
loss = K.variable(0.)
layer_features = outputs_dict[content_layer]
target_image_features = layer_features[0, :, :, :]
combination_features = layer_features[2, :, :, :]
loss.assign_add(content_weight * content_loss(target_image_features,combination_features))
for layer_name in style_layers:
layer_features = outputs_dict[layer_name]
style_reference_features = layer_features[1, :, :, :]
combination_features = layer_features[2, :, :, :]
sl = style_loss(style_reference_features, combination_features, img_height, img_width)
loss.assign_add((style_weight / len(style_layers)) * sl)
loss.assign_add(total_variation_weight * total_variation_loss(combination_image, img_height, img_width))
grads = K.gradients(loss, combination_image)[0]
fetch_loss_and_grads = K.function([combination_image], [loss, grads])
class Evaluator(object):
def __init__(self):
self.loss_value = None
self.grads_values = None
def loss(self, x):
assert self.loss_value is None
x = x.reshape((1, img_height, img_width, 3))
outs = fetch_loss_and_grads([x])
def main(FLAGS):
style_features_t = losses.get_style_features(FLAGS) #style target的Gram
#make sure the training path exists
training_path = os.path.join(FLAGS.model_path,FLAGS.naming) #model/wave/ ；用于存放训练好的模型
if not (os.path.exists(training_path)):
os.makedirs(training_path)
with tf.Graph().as_default(): #默认计算图
with tf.Session() as sess:#没有as_default(),因此，走出with 语句，sess停止执行，不能在被用
"""build loss network"""
network_fn =nets_factory.get_network_fn(FLAGS.loss_model,num_classes=1,is_training=False) #取出loss model，且该model不用训练
#对要进入loss_model的content_image,和generated_image进行preprocessing
image_preprocessing_fn,image_unpreprocessing_fn = preprocessing_factory.get_preprocessing(FLAGS.loss_model,is_training=False) #取出用于loss_model的，对image进行preprocessing和unpreprocessing的function
processed_image = reader.image(FLAGS.batch_size,FLAGS.image_size,FLAGS.image_size,'train2014/',image_preprocessing_fn,epochs=FLAGS.epoch) #这里要preprocessing的image是一个batch，为training_data
generated = model.net(processed_images,training=True) #输入“图像生成网络”的image为经过preprocessing_image，“图像生成网络”为要训练的网络
processed_generated = [image_preprocessing_fn(image,FLAGS.image_size,FLAGS.image_size) for image in tf.unstack(generated,axis=0,num=FLAGS.batch_size)]
processed_generated = tf.stack(processed_generated)
#计算generated_image和content_image进入loss_model后，更layer的output
_,endpoints_dict= network_fn(tf.concat([processed_generated,processed_images],0),spatial_squeeze=False)#endpoints_dict中存储的是2类image各个layer的值
#log the structure of loss network
tf.logging.info('loss network layers(you can define them in "content layer" and "style layer"):')
for key in endpoints_dict:
tf.logging.info(key) #屏幕输出loss_model的各个layer name
"""build losses"""
content_loss = losses.content_loss(endpoints_dict,FLAGS.content_layers)
style_loss,style_loss_summary = losses.style_loss(endpoints_dict,style_features_t,FLAGS.style_layers)
tv_loss = losses.total_variation_loss(generated)
loss = FLAGS.style_weight * style_loss + FLAGS.content_weight * content_loss + FLAGS.tv_weight * tv_loss
# Add Summary for visualization in tensorboard
"""Add Summary"""
tf.summary.scalar('losses/content_loss',content_loss)
tf.summary.scalar('losses/style_loss',style_loss)
tf.summary.scalar('losses/regularizer_loss',tv_loss)
tf.summary.scalar('weighted_losses/weighted content_loss',content_loss * FLAGS.content_weight)
tf.summary.scalar('weighted_losses/weighted style_loss',style_loss * FLAGS.style_weight)
tf.summary.scalar('weighted_losses/weighted_regularizer_loss',tv_loss * FLAGS.tv_weight)
tf.summary.scalar('total_loss',loss)
for layer in FLAGS.style_layers:
tf.summary.scalar('style_losses/' + layer,style_loss_summary[layer])
tf.summary.image('genearted',generated)
tf.summary.image('origin',tf.stack([image_unprocessing_fn(image) for image in tf.unstack(processed_images,axis=0,num=FLAGS.batch_size)]))
summary = tf.summary.merge_all()
writer = tf.summary.FileWriter(training_path)
"""prepare to train"""
global_step = tf.Variable(0,name='global_step',trainable=False)#iteration step
variable_to_train = []#需要训练的变量
for variable in tf.trainable_variables():#在图像风格迁移网络（图像生成网络+损失网络）各参数中，找需要训练的参数
if not (variable.name.startswith(FLAGS.loss_model)):
variable_to_train.append(variable)
train_op = tf.train.AdamOptimizer(1e-3).minimize(loss,global_step = global_step,var_list = variable_to_train) #需要放入sess.run()
variable_to_restore = []#在所有的全局变量中，找需要恢复默认设置的变量； 注意：local_variable指的是一些临时变量和中间变量，用于线程中，线程结束则消失
for v tf.global_variables():
if not (v.name.startswith(FLAGS.loss_model)):
variables_to_restore.append(v)
saver = tf.train.Saver(variables_to_restore,write_version=tf.train.SaverDef.V1)#利用saver.restore()恢复默认设置；这里的variable_to_restore，是需要save and restore的var_list
sess.run([tf.global_variables_initializer(),tf.local_variables_initializer()])#对全局变量和局部变量进行初始化操作：即恢复默认设置
#restore variables for loss model 恢复loss model中的参数
init_func = utils._get_init_fn(FLAGS)
init_func(sess)
#restore variables for training model if the checkpoint file exists. 如果training_model已有训练好的参数，将其载入
last_file = tf.train.latest_checkpoint(training_path)#将train_path中的model参数数据取出
if last_file:
tf.logging.info('restoringmodel from {}'.format(last_file))
saver.restore(sess,last_file) #那如果last_file不存在，就不执行restore操作吗？需要restore的参数只是图像生成网络吗？
"""start training"""
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
start_time = time.time()
try:
while not coord.should_stop():#查看线程是否停止(即：是否所有数据均运行完毕）
_,loss_t,step = sess.run([train_op,loss,global_step])
elapsed_time = time.time()
"""logging"""
#print(step)
if step % 10 == 0:
tf.logging.info('step:%d, total loss %f, secs/step: %f' % (step,loss_t,elapsed_time))
"""summary"""
if step % 25 == 0:
tf.logging.info('adding summary...')
summary_str = sess.run(summary)
writer.add_summary(summary_str,step)
writer.flush()
"""checkpoint"""
if step % 1000 == 0:
saver.save(sess,os.path.join(training_path,'fast-style-model.ckpt'),global_step=step)#保存variable_to_restore中的参数值
except tf.errors.OutOfRangeError:
saver.save(sess,os.path.join(training_path,'fast-style-model.ckpt-done'))
tf.logging.info('Done training -- epoch limit reached')
finally:
coord.request_stop()#要求停止所有线程
coord.join(threads)#将线程并入主线程，删除
def train():
style_feature, style_grams = get_style_feature()
with tf.Graph().as_default():
with tf.Session() as sess:
#loss_input_style = tf.placeholder(dtype = tf.float32 , shape = [args.batch , args.size , args.size , args.in_dim ])
#loss_input_target =tf.placeholder(dtype = tf.float32 , shape = [args.batch , args.size , args.size , args.in_dim ])
# For online optimization problem, use testing preprocess for both train and test
preprocess_func, unprocess_func = preprocessing.preprocessing_factory.get_preprocessing(
args.loss_model, is_training=False)
images = reader.image(args.batch, args.size , args.size, args.target_dir , preprocess_func, \
args.epoch , shuffle = True)
model = transform(sess, args)
transformed_images = model.generator(images, reuse=False)
#print('qqq')
#print( tf.shape(transformed_images).eval())
unprocess_transform = [(img) for img in tf.unstack(
transformed_images, axis=0, num=args.batch)]
processed_generated = [
preprocess_func(img, args.size, args.size)
for img in unprocess_transform
]
processed_generated = tf.stack(processed_generated)
loss_model = nets.nets_factory.get_network_fn(args.loss_model,
num_classes=1,
is_training=False)
pair = tf.concat([processed_generated, images], axis=0)
_, end_dicts = loss_model(pair, spatial_squeeze=False)
init_loss_model = load_pretrained_weight(args.loss_model)
c_loss = losses.content_loss(
end_dicts, loss_config.content_loss_dict[args.loss_model])
s_loss, s_loss_sum = losses.style_loss(
end_dicts, loss_config.style_loss_dict[args.loss_model],
style_grams)
tv_loss = losses.total_variation_loss(transformed_images)
loss = args.c_weight * c_loss + args.s_weight * s_loss + args.tv_weight * tv_loss
print('shapes')
print(pair.get_shape())
#tf.summary.scalar('average', tf.reduce_mean(images))
#tf.summary.scalar('gram average', tf.reduce_mean(tf.stack(style_feature)))
tf.summary.scalar('losses/content_loss', c_loss)
tf.summary.scalar('losses/style_loss', s_loss)
tf.summary.scalar('losses/tv_loss', tv_loss)
tf.summary.scalar('weighted_losses/weighted_content_loss',
c_loss * args.c_weight)
tf.summary.scalar('weighted_losses/weighted_style_loss',
s_loss * args.s_weight)
tf.summary.scalar('weighted_losses/weighted_regularizer_loss',
tv_loss * args.tv_weight)
tf.summary.scalar('total_loss', loss)
for layer in loss_config.style_loss_dict[args.loss_model]:
tf.summary.scalar('style_losses/' + layer, s_loss_sum[layer])
tf.summary.image('transformed',
tf.stack(unprocess_transform, axis=0))
# tf.image_summary('processed_generated', processed_generated) # May be better?
tf.summary.image(
'ori',
tf.stack([
unprocess_func(image)
for image in tf.unstack(images, axis=0, num=args.batch)
]))
summary = tf.summary.merge_all()
writer = tf.summary.FileWriter(args.log_dir)
step = tf.Variable(0, name='global_step', trainable=False)
all_trainables = tf.trainable_variables()
all_vars = tf.global_variables()
to_train = [
var for var in all_trainables
if not args.loss_model in var.name
]
to_restore = [
var for var in all_vars if not args.loss_model in var.name
]
optim = tf.train.AdamOptimizer( 1e-3 ).minimize(\
loss = loss , var_list = to_train , global_step = step)
saver = tf.train.Saver(to_restore)
style_name = (args.style_dir.split('/')[-1]).split('.')[0]
ckpt = tf.train.latest_checkpoint(
os.path.join(args.ckpt_dir, style_name))
if ckpt:
tf.logging.info('Restoring model from {}'.format(ckpt))
saver.restore(sess, ckpt)
sess.run([
tf.global_variables_initializer(),
tf.local_variables_initializer()
])
#sess.run(init_loss_model)
init_loss_model(sess)
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
start_time = time()
#i = 0
try:
while True:
_, gs, sum_info, c_info, s_info, tv_info, loss_info = sess.run(
[optim, step, summary, c_loss, s_loss, tv_loss, loss])
writer.add_summary(sum_info, gs)
elapsed = time() - start_time
print(gs)
if gs % 10 == 0:
tf.logging.info(
'step: %d, c_loss %f s_loss %f tv_loss %f total Loss %f, secs/step: %f'
%
(gs, c_info, s_info, tv_info, loss_info, elapsed))
if gs % args.save_freq == 0:
saver.save(
sess,
os.path.join(args.ckpt_dir, style_name,
style_name + '.ckpt'))
except tf.errors.OutOfRangeError:
print('run out of images! save final model: ' +
os.path.join(args.ckpt_dir, style_name + '.ckpt-done'))
saver.save(
sess,
os.path.join(args.ckpt_dir, style_name,
style_name + '.ckpt-done'))
tf.logging.info('Done -- file ran out of range')
finally:
coord.request_stop()
coord.join(threads)
print('end training')
'''
def main(FLAGS):
style_features_t = losses.get_style_features(FLAGS)
training_path = os.path.join(FLAGS.model_path, FLAGS.naming)
if not (os.path.exists(training_path)):
os.makedirs(training_path)
with tf.Graph().as_default():
with tf.Session() as sess:
"""创建Network"""
network_fn = nets_factory.get_network_fn(
FLAGS.loss_model,
num_classes=1,
is_training=False)
image_preprocessing_fn, image_unprocessing_fn = preprocessing_factory.get_preprocessing(
FLAGS.loss_model,
is_training=False)
"""训练图片预处理"""
processed_images = reader.batch_image(FLAGS.batch_size, FLAGS.image_size, FLAGS.image_size,
'train2014/', image_preprocessing_fn, epochs=FLAGS.epoch)
generated = model.transform_network(processed_images, training=True)
processed_generated = [image_preprocessing_fn(image, FLAGS.image_size, FLAGS.image_size)
for image in tf.unstack(generated, axis=0, num=FLAGS.batch_size)
]
processed_generated = tf.stack(processed_generated)
_, endpoints_dict = network_fn(tf.concat([processed_generated, processed_images], 0), spatial_squeeze=False)
tf.logging.info('Loss network layers(You can define them in "content_layers" and "style_layers"):')
for key in endpoints_dict:
tf.logging.info(key)
"""创建 Losses"""
content_loss = losses.content_loss(endpoints_dict, FLAGS.content_layers)
style_loss, style_loss_summary = losses.style_loss(endpoints_dict, style_features_t, FLAGS.style_layers)
tv_loss = losses.total_variation_loss(generated) # use the unprocessed image
loss = FLAGS.style_weight * style_loss + FLAGS.content_weight * content_loss + FLAGS.tv_weight * tv_loss
"""准备训练"""
global_step = tf.Variable(0, name="global_step", trainable=False)
variable_to_train = []
for variable in tf.trainable_variables():
# 只训练和保存生成网络中的变量
if not (variable.name.startswith(FLAGS.loss_model)):
variable_to_train.append(variable)
"""优化"""
train_op = tf.train.AdamOptimizer(1e-3).minimize(loss, global_step=global_step, var_list=variable_to_train)
variables_to_restore = []
for v in tf.global_variables():
if not (v.name.startswith(FLAGS.loss_model)):
variables_to_restore.append(v)
saver = tf.train.Saver(variables_to_restore, write_version=tf.train.SaverDef.V1)
sess.run([tf.global_variables_initializer(), tf.local_variables_initializer()])
init_func = utils._get_init_fn(FLAGS)
init_func(sess)
last_file = tf.train.latest_checkpoint(training_path)
if last_file:
tf.logging.info('Restoring model from {}'.format(last_file))
saver.restore(sess, last_file)
"""开始训练"""
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
start_time = time.time()
try:
while not coord.should_stop():
_, loss_t, step = sess.run([train_op, loss, global_step])
elapsed_time = time.time() - start_time
start_time = time.time()
if step % 10 == 0:
tf.logging.info(
'step: %d, total Loss %f, secs/step: %f,%s' % (step, loss_t, elapsed_time, time.asctime()))
"""checkpoint"""
if step % 50 == 0:
tf.logging.info('saving check point...')
saver.save(sess, os.path.join(training_path, FLAGS.naming + '.ckpt'), global_step=step)
except tf.errors.OutOfRangeError:
saver.save(sess, os.path.join(training_path, 'fast-style-model.ckpt-done'))
tf.logging.info('Done training -- epoch limit reached')
finally:
coord.request_stop()
tf.logging.info('coordinator stop')
coord.join(threads)
def main(FLAGS):
style_features_t = losses.get_style_features(FLAGS)
# Make sure the training path exists.
training_path = os.path.join(FLAGS.model_path, FLAGS.naming)
if not(os.path.exists(training_path)):
os.makedirs(training_path)
with tf.Graph().as_default():
with tf.Session() as sess:
"""Build Network"""
network_fn = nets_factory.get_network_fn(
FLAGS.loss_model,
num_classes=1,
is_training=False)
image_preprocessing_fn, image_unprocessing_fn = preprocessing_factory.get_preprocessing(
FLAGS.loss_model,
is_training=False)
processed_images = reader.image(FLAGS.batch_size, FLAGS.image_size, FLAGS.image_size,
'train2014/', image_preprocessing_fn, epochs=FLAGS.epoch)
generated = model.net(processed_images, training=True)
processed_generated = [image_preprocessing_fn(image, FLAGS.image_size, FLAGS.image_size)
for image in tf.unstack(generated, axis=0, num=FLAGS.batch_size)
]
processed_generated = tf.stack(processed_generated)
_, endpoints_dict = network_fn(tf.concat([processed_generated, processed_images], 0), spatial_squeeze=False)
# Log the structure of loss network
tf.logging.info('Loss network layers(You can define them in "content_layers" and "style_layers"):')
for key in endpoints_dict:
tf.logging.info(key)
"""Build Losses"""
content_loss = losses.content_loss(endpoints_dict, FLAGS.content_layers)
style_loss, style_loss_summary = losses.style_loss(endpoints_dict, style_features_t, FLAGS.style_layers)
tv_loss = losses.total_variation_loss(generated) # use the unprocessed image
loss = FLAGS.style_weight * style_loss + FLAGS.content_weight * content_loss + FLAGS.tv_weight * tv_loss
# Add Summary for visualization in tensorboard.
"""Add Summary"""
tf.summary.scalar('losses/content_loss', content_loss)
tf.summary.scalar('losses/style_loss', style_loss)
tf.summary.scalar('losses/regularizer_loss', tv_loss)
tf.summary.scalar('weighted_losses/weighted_content_loss', content_loss * FLAGS.content_weight)
tf.summary.scalar('weighted_losses/weighted_style_loss', style_loss * FLAGS.style_weight)
tf.summary.scalar('weighted_losses/weighted_regularizer_loss', tv_loss * FLAGS.tv_weight)
tf.summary.scalar('total_loss', loss)
for layer in FLAGS.style_layers:
tf.summary.scalar('style_losses/' + layer, style_loss_summary[layer])
tf.summary.image('generated', generated)
# tf.image_summary('processed_generated', processed_generated) # May be better?
tf.summary.image('origin', tf.stack([
image_unprocessing_fn(image) for image in tf.unstack(processed_images, axis=0, num=FLAGS.batch_size)
]))
summary = tf.summary.merge_all()
writer = tf.summary.FileWriter(training_path)
"""Prepare to Train"""
global_step = tf.Variable(0, name="global_step", trainable=False)
variable_to_train = []
for variable in tf.trainable_variables():
if not(variable.name.startswith(FLAGS.loss_model)):
variable_to_train.append(variable)
train_op = tf.train.AdamOptimizer(1e-3).minimize(loss, global_step=global_step, var_list=variable_to_train)
variables_to_restore = []
for v in tf.global_variables():
if not(v.name.startswith(FLAGS.loss_model)):
variables_to_restore.append(v)
saver = tf.train.Saver(variables_to_restore, write_version=tf.train.SaverDef.V1)
sess.run([tf.global_variables_initializer(), tf.local_variables_initializer()])
# Restore variables for loss network.
init_func = utils._get_init_fn(FLAGS)
init_func(sess)
# Restore variables for training model if the checkpoint file exists.
last_file = tf.train.latest_checkpoint(training_path)
if last_file:
tf.logging.info('Restoring model from {}'.format(last_file))
saver.restore(sess, last_file)
"""Start Training"""
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
start_time = time.time()
try:
while not coord.should_stop():
_, loss_t, step = sess.run([train_op, loss, global_step])
elapsed_time = time.time() - start_time
start_time = time.time()
"""logging"""
# print(step)
if step % 10 == 0:
tf.logging.info('step: %d, total Loss %f, secs/step: %f' % (step, loss_t, elapsed_time))
"""summary"""
if step % 25 == 0:
tf.logging.info('adding summary...')
summary_str = sess.run(summary)
writer.add_summary(summary_str, step)
writer.flush()
"""checkpoint"""
if step % 1000 == 0:
saver.save(sess, os.path.join(training_path, 'fast-style-model.ckpt'), global_step=step)
except tf.errors.OutOfRangeError:
saver.save(sess, os.path.join(training_path, 'fast-style-model.ckpt-done'))
tf.logging.info('Done training -- epoch limit reached')
finally:
coord.request_stop()
coord.join(threads)
def main(args):
# Unpack command-line arguments.
style_img_path = args.style_img_path
cont_img_path = args.cont_img_path
learn_rate = args.learn_rate
loss_content_layers = args.loss_content_layers
loss_style_layers = args.loss_style_layers
content_weights = args.content_weights
style_weights = args.style_weights
num_steps_break = args.num_steps_break
beta = args.beta
style_target_resize = args.style_target_resize
cont_target_resize = args.cont_target_resize
output_img_path = args.output_img_path
# Load in style image that will define the model.
style_img = utils.imread(style_img_path)
style_img = utils.imresize(style_img, style_target_resize)
style_img = style_img[np.newaxis, :].astype(np.float32)
# Alter the names to include a namescope that we'll use + output suffix.
loss_style_layers = ['vgg/' + i + ':0' for i in loss_style_layers]
loss_content_layers = ['vgg/' + i + ':0' for i in loss_content_layers]
# Get target Gram matrices from the style image.
with tf.variable_scope('vgg'):
X_vgg = tf.placeholder(tf.float32, shape=style_img.shape, name='input')
vggnet = vgg16.vgg16(X_vgg)
with tf.Session() as sess:
vggnet.load_weights('libs/vgg16_weights.npz', sess)
print 'Precomputing target style layers.'
target_grams = sess.run(utils.get_grams(loss_style_layers),
feed_dict={'vgg/input:0': style_img})
# Clean up so we can re-create vgg at size of input content image for
# training.
print 'Resetting default graph.'
tf.reset_default_graph()
# Read in + resize the content image.
cont_img = utils.imread(cont_img_path)
cont_img = utils.imresize(cont_img, cont_target_resize)
cont_img = cont_img[np.newaxis, :].astype(np.float32)
# Setup VGG and initialize it with white noise image that we'll optimize.
shape = cont_img.shape
with tf.variable_scope('to_train'):
white_noise = np.random.rand(shape[0], shape[1], shape[2],
shape[3]) * 255.0
white_noise = tf.constant(white_noise.astype(np.float32))
X = tf.get_variable('input', dtype=tf.float32, initializer=white_noise)
with tf.variable_scope('vgg'):
vggnet = vgg16.vgg16(X)
# Get the gram matrices' tensors for the style loss features.
input_img_grams = utils.get_grams(loss_style_layers)
# Get the tensors for content loss features.
content_layers = utils.get_layers(loss_content_layers)
# Get the target content features
with tf.Session() as sess:
vggnet.load_weights('libs/vgg16_weights.npz', sess)
print 'Precomputing target content layers.'
content_targets = sess.run(content_layers,
feed_dict={'to_train/input:0': cont_img})
# Create loss function
cont_loss = losses.content_loss(content_layers, content_targets,
content_weights)
style_loss = losses.style_loss(input_img_grams, target_grams,
style_weights)
tv_loss = losses.tv_loss(X)
loss = cont_loss + style_loss + beta * tv_loss
# We do not want to train VGG, so we must grab the subset.
train_vars = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
scope='to_train')
# Setup step + optimizer
global_step = tf.Variable(0, name='global_step', trainable=False)
optimizer = tf.train.AdamOptimizer(learn_rate) \
.minimize(loss, global_step, train_vars)
# Initializer
init_op = tf.global_variables_initializer()
# Begin training
with tf.Session() as sess:
sess.run(init_op)
vggnet.load_weights('libs/vgg16_weights.npz', sess)
current_step = 0
while current_step < num_steps_break:
current_step = sess.run(global_step)
if (current_step % 10 == 0):
# Collect some diagnostic data for Tensorboard.
_, loss_out = sess.run([optimizer, loss])
# Do some standard output.
print current_step, loss_out
else:
# optimizer.minimize(sess)
_, loss_out = sess.run([optimizer, loss])
# Upon finishing, get the X tensor (our image).
img_out = sess.run(X)
# Save it.
img_out = np.squeeze(img_out)
utils.imwrite(output_img_path, img_out)
# create image merging content and style
g = tf.Graph()
with g.as_default(), g.device('/gpu:0'), tf.Session() as sess:
# init randomly
# white noise
target = tf.random_normal((1, ) + content.shape)
target_pre_var = tf.Variable(target)
# build model with empty layer activations for generated target image
model = network_model.get_model(target_pre_var)
# compute loss
cont_cost = losses.content_loss(content_out, model, C_LAYER,
options.content_weight)
style_cost = losses.style_loss(style_out, model, S_LAYERS,
style_weight_layer)
tv_cost = losses.total_var_loss(target_pre_var, options.tv_weight)
total_loss = cont_cost + tf.add_n(style_cost) + tv_cost
# total_loss = tf.add_n(tf.get_collection('losses'), name='total_loss')
train_step = tf.train.AdamOptimizer(learning_rate).minimize(total_loss)
sess.run(tf.global_variables_initializer())
min_loss = float("inf")
best = None
for i in range(options.iter):
train_step.run()
print('Iteration %d/%d' % (i + 1, options.iter))
if (i % 5 == 0):
def main(unused_agrv=None):
"""main
:param args:
argparse.Namespace object from argparse.parse_args().
"""
# Unpack command-line arguments.
train_dir = FLAGS.train_dir
style_dataset = FLAGS.style_dataset
model_name = FLAGS.model_name
preprocess_size = [FLAGS.image_size, FLAGS.image_size]
batch_size = FLAGS.batch_size
n_epochs = FLAGS.n_epochs
run_name = FLAGS.run_name
checkpoint = FLAGS.checkpoint
learn_rate = FLAGS.learning_rate
content_weights = FLAGS.content_weights
style_weights = FLAGS.style_weights
num_pipe_buffer = FLAGS.num_pipe_buffer
style_coefficients = FLAGS.style_coefficients
num_styles = FLAGS.num_styles
train_steps = FLAGS.train_steps
upsample_method = FLAGS.upsample_method
# Setup input pipeline (delegate it to CPU to let GPU handle neural net)
files = tf.train.match_filenames_once(train_dir + '/train-*')
style_files = tf.train.match_filenames_once(style_dataset)
print("style %s" % style_files)
with tf.variable_scope('input_pipe'), tf.device('/cpu:0'):
_, style_labels, style_grams = datapipe.style_batcher(
style_files, batch_size, preprocess_size, n_epochs,
num_pipe_buffer)
batch_op = datapipe.batcher(files, batch_size, preprocess_size,
n_epochs, num_pipe_buffer)
""" Set up the style coefficients """
if style_coefficients is None:
style_coefficients = [1.0 for _ in range(num_styles)]
else:
style_coefficients = ast.literal_eval(style_coefficients)
if len(style_coefficients) != num_styles:
raise ValueError(
'number of style coeffients differs from number of styles')
style_coefficient = tf.gather(tf.constant(style_coefficients),
style_labels)
""" Set up weight of style and content image """
content_weights = ast.literal_eval(content_weights)
style_weights = ast.literal_eval(style_weights)
style_weights = dict([(key, style_coefficient * val)
for key, val in style_weights.iteritems()])
target_grams = []
for name, val in style_weights.iteritems():
target_grams.append(style_grams[name])
# Alter the names to include a name_scope that we'll use + output suffix.
loss_style_layers = []
loss_style_weights = []
loss_content_layers = []
loss_content_weights = []
for key, val in style_weights.iteritems():
loss_style_layers.append(key + ':0')
loss_style_weights.append(val)
for key, val in content_weights.iteritems():
loss_content_layers.append(key + ':0')
loss_content_weights.append(val)
# Load in image transformation network into default graph.
shape = [batch_size] + preprocess_size + [3]
with tf.variable_scope('styleNet'):
X = tf.placeholder(tf.float32, shape=shape, name='input')
Y = transform(X, style_labels, num_styles, upsample_method)
print(Y)
# Connect vgg directly to the image transformation network.
with tf.variable_scope('vgg'):
vggnet = vgg16.vgg16(Y)
# Get the gram matrices' tensors for the style loss features.
input_img_grams = utils.get_grams(loss_style_layers)
# Get the tensors for content loss features.
content_layers = utils.get_layers(loss_content_layers)
# Create loss function
content_targets = tuple(
tf.placeholder(tf.float32,
shape=layer.get_shape(),
name='content_input_{}'.format(i))
for i, layer in enumerate(content_layers))
cont_loss = losses.content_loss(content_layers, content_targets,
loss_content_weights)
style_loss = losses.style_loss(input_img_grams, target_grams,
loss_style_weights)
loss = cont_loss + style_loss
with tf.name_scope('summaries'):
tf.summary.scalar('loss', loss)
tf.summary.scalar('style_loss', style_loss)
tf.summary.scalar('content_loss', cont_loss)
# We do not want to train VGG, so we must grab the subset.
other_vars = [
var for var in tf.get_variable_scope('styleNet')
if 'CondInstNorm' not in var.name
]
train_vars = [
var for var in tf.get_variable_scope('styleNet')
if 'CondInstNorm' in var.name
]
# Setup step + optimizer
global_step = tf.Variable(0, name='global_step', trainable=False)
optimizer = tf.train.AdamOptimizer(learn_rate).minimize(
loss, global_step, train_vars)
# Setup subdirectory for this run's Tensoboard logs.
if not os.path.exists('./summaries/train/'):
os.makedirs('./summaries/train/')
if run_name is None:
current_dirs = [
name for name in os.listdir('./summaries/train/')
if os.path.isdir('./summaries/train/' + name)
]
name = model_name + '0'
count = 0
while name in current_dirs:
count += 1
name = model_name + '{}'.format(count)
run_name = name
# Savers and summary writers
if not os.path.exists('./training'): # Dir that we'll later save .ckpts to
os.makedirs('./training')
if not os.path.exists('./models'): # Dir that save final models to
os.makedirs('./models')
saver = tf.train.Saver()
saver_n_stylee = tf.train.Saver(other_vars)
final_saver = tf.train.Saver(train_vars)
merged = tf.summary.merge_all()
full_log_path = './summaries/train/' + run_name
train_writer = tf.summary.FileWriter(full_log_path, tf.Session().graph)
# We must include local variables because of batch pipeline.
init_op = tf.group(tf.global_variables_initializer(),
tf.local_variables_initializer())
# Begin training.
print 'Starting training...'
with tf.Session() as sess:
# Initialization
sess.run(init_op)
vggnet.load_weights(vgg16.checkpoint_file(), sess)
saver_n_stylee.restore(sess, checkpoint)
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(sess=sess, coord=coord)
try:
while not coord.should_stop():
current_step = sess.run(global_step)
batch = sess.run(batch_op)
# Collect content targets
content_data = sess.run(content_layers, feed_dict={Y: batch})
feed_dict = {X: batch, content_targets: content_data}
if (current_step % 1000 == 0):
# Save a checkpoint
save_path = 'training/' + model_name + '.ckpt'
saver.save(sess, save_path, global_step=global_step)
summary, _, loss_out, c_loss, s_loss = sess.run(
[merged, optimizer, loss, cont_loss, style_loss],
feed_dict=feed_dict)
train_writer.add_summary(summary, current_step)
print current_step, loss_out, c_loss, s_loss
elif (current_step % 10 == 0):
# Collect some diagnostic data for Tensorboard.
summary, _, loss_out, c_loss, s_loss = sess.run(
[merged, optimizer, loss, cont_loss, style_loss],
feed_dict=feed_dict)
train_writer.add_summary(summary, current_step)
# Do some standard output.
# if (current_step % 1000 == 0):
print current_step, loss_out, c_loss, s_loss
else:
_, loss_out = sess.run([optimizer, loss],
feed_dict=feed_dict)
# Throw error if we reach number of steps to break after.
if current_step == train_steps:
print('Done training.')
break
except tf.errors.OutOfRangeError:
print('Done training.')
finally:
# Save the model (the image transformation network) for later usage
# in predict.py
final_saver.save(sess,
'models/' + model_name + '_final.ckpt',
write_meta_graph=False)
coord.request_stop()
coord.join(threads)
def main(args):
"""main
:param args:
argparse.Namespace object from argparse.parse_args().
"""
# Unpack command-line arguments.
train_dir = args.train_dir
style_img_path = args.style_img_path
model_name = args.model_name
preprocess_size = args.preprocess_size
batch_size = args.batch_size
n_epochs = args.n_epochs
run_name = args.run_name
learn_rate = args.learn_rate
loss_content_layers = args.loss_content_layers
loss_style_layers = args.loss_style_layers
content_weights = args.content_weights
style_weights = args.style_weights
num_steps_ckpt = args.num_steps_ckpt
num_pipe_buffer = args.num_pipe_buffer
num_steps_break = args.num_steps_break
beta_val = args.beta
style_target_resize = args.style_target_resize
upsample_method = args.upsample_method
# Load in style image that will define the model.
style_img = utils.imread(style_img_path)
style_img = utils.imresize(style_img, style_target_resize)
style_img = style_img[np.newaxis, :].astype(np.float32)
# Alter the names to include a namescope that we'll use + output suffix.
loss_style_layers = ['vgg/' + i + ':0' for i in loss_style_layers]
loss_content_layers = ['vgg/' + i + ':0' for i in loss_content_layers]
# Get target Gram matrices from the style image.
with tf.variable_scope('vgg'):
X_vgg = tf.placeholder(tf.float32, shape=style_img.shape, name='input')
vggnet = vgg16.vgg16(X_vgg)
with tf.Session() as sess:
vggnet.load_weights('libs/vgg16_weights.npz', sess)
print('Precomputing target style layers.')
target_grams = sess.run(utils.get_grams(loss_style_layers),
feed_dict={X_vgg: style_img})
# Clean up so we can re-create vgg connected to our image network.
print('Resetting default graph.')
tf.reset_default_graph()
# Load in image transformation network into default graph.
shape = [batch_size] + preprocess_size + [3]
with tf.variable_scope('img_t_net'):
X = tf.placeholder(tf.float32, shape=shape, name='input')
Y = create_net(X, upsample_method)
# Connect vgg directly to the image transformation network.
with tf.variable_scope('vgg'):
vggnet = vgg16.vgg16(Y)
# Get the gram matrices' tensors for the style loss features.
input_img_grams = utils.get_grams(loss_style_layers)
# Get the tensors for content loss features.
content_layers = utils.get_layers(loss_content_layers)
# Create loss function
content_targets = tuple(
tf.placeholder(tf.float32,
shape=layer.get_shape(),
name='content_input_{}'.format(i))
for i, layer in enumerate(content_layers))
cont_loss = losses.content_loss(content_layers, content_targets,
content_weights)
style_loss = losses.style_loss(input_img_grams, target_grams,
style_weights)
tv_loss = losses.tv_loss(Y)
beta = tf.placeholder(tf.float32, shape=[], name='tv_scale')
loss = cont_loss + style_loss + beta * tv_loss
with tf.name_scope('summaries'):
tf.summary.scalar('loss', loss)
tf.summary.scalar('style_loss', style_loss)
tf.summary.scalar('content_loss', cont_loss)
tf.summary.scalar('tv_loss', beta * tv_loss)
# Setup input pipeline (delegate it to CPU to let GPU handle neural net)
files = tf.train.match_filenames_once(train_dir + '/train-*')
with tf.variable_scope('input_pipe'), tf.device('/cpu:0'):
batch_op = datapipe.batcher(files, batch_size, preprocess_size,
n_epochs, num_pipe_buffer)
# We do not want to train VGG, so we must grab the subset.
train_vars = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
scope='img_t_net')
# Setup step + optimizer
global_step = tf.Variable(0, name='global_step', trainable=False)
optimizer = tf.train.AdamOptimizer(learn_rate).minimize(
loss, global_step, train_vars)
# Setup subdirectory for this run's Tensoboard logs.
if not os.path.exists('./summaries/train/'):
os.makedirs('./summaries/train/')
if run_name is None:
current_dirs = [
name for name in os.listdir('./summaries/train/')
if os.path.isdir('./summaries/train/' + name)
]
name = model_name + '0'
count = 0
while name in current_dirs:
count += 1
name = model_name + '{}'.format(count)
run_name = name
# Savers and summary writers
if not os.path.exists('./training'): # Dir that we'll later save .ckpts to
os.makedirs('./training')
if not os.path.exists('./models'): # Dir that save final models to
os.makedirs('./models')
saver = tf.train.Saver()
final_saver = tf.train.Saver(train_vars)
merged = tf.summary.merge_all()
full_log_path = './summaries/train/' + run_name
train_writer = tf.summary.FileWriter(full_log_path)
# We must include local variables because of batch pipeline.
init_op = tf.group(tf.global_variables_initializer(),
tf.local_variables_initializer())
# Begin training.
print('Starting training...')
with tf.Session() as sess:
# Initialization
sess.run(init_op)
vggnet.load_weights('libs/vgg16_weights.npz', sess)
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(sess=sess, coord=coord)
try:
while not coord.should_stop():
current_step = sess.run(global_step)
batch = sess.run(batch_op)
# Collect content targets
content_data = sess.run(content_layers, feed_dict={Y: batch})
feed_dict = {
X: batch,
content_targets: content_data,
beta: beta_val
}
if (current_step % num_steps_ckpt == 0):
# Save a checkpoint
save_path = 'training/' + model_name + '.ckpt'
saver.save(sess, save_path, global_step=global_step)
summary, _, loss_out = sess.run([merged, optimizer, loss],
feed_dict=feed_dict)
train_writer.add_summary(summary, current_step)
print(current_step, loss_out)
elif (current_step % 10 == 0):
# Collect some diagnostic data for Tensorboard.
summary, _, loss_out = sess.run([merged, optimizer, loss],
feed_dict=feed_dict)
train_writer.add_summary(summary, current_step)
# Do some standard output.
print(current_step, loss_out)
else:
_, loss_out = sess.run([optimizer, loss],
feed_dict=feed_dict)
# Throw error if we reach number of steps to break after.
if current_step == num_steps_break:
print('Done training.')
break
except tf.errors.OutOfRangeError:
print('Done training.')
finally:
# Save the model (the image transformation network) for later usage
# in predict.py
final_saver.save(sess, 'models/' + model_name + '_final.ckpt')
coord.request_stop()
coord.join(threads)
def main(argv=None):
content_layers = FLAGS.content_layers.split(',')
style_layers = FLAGS.style_layers.split(',')
style_layers_weights = [
float(i) for i in FLAGS.style_layers_weights.split(",")
]
#num_steps_decay = 82786 / FLAGS.batch_size
num_steps_decay = 10000
style_features_t = losses.get_style_features(FLAGS)
training_path = os.path.join(FLAGS.model_path, FLAGS.naming)
if not (os.path.exists(training_path)):
os.makedirs(training_path)
with tf.Session() as sess:
"""Build Network"""
network_fn = nets_factory.get_network_fn(FLAGS.loss_model,
num_classes=1,
is_training=False)
image_preprocessing_fn, image_unprocessing_fn = preprocessing_factory.get_preprocessing(
FLAGS.loss_model, is_training=False)
processed_images = reader.image(FLAGS.batch_size,
FLAGS.image_size,
FLAGS.image_size,
'train2014/',
image_preprocessing_fn,
epochs=FLAGS.epoch)
generated = model.net(processed_images, FLAGS.alpha)
processed_generated = [
image_preprocessing_fn(image, FLAGS.image_size, FLAGS.image_size)
for image in tf.unstack(generated, axis=0, num=FLAGS.batch_size)
]
processed_generated = tf.stack(processed_generated)
_, endpoints_dict = network_fn(tf.concat(
[processed_generated, processed_images], 0),
spatial_squeeze=False)
"""Build Losses"""
content_loss = losses.content_loss(endpoints_dict, content_layers)
style_loss, style_losses = losses.style_loss(endpoints_dict,
style_features_t,
style_layers,
style_layers_weights)
tv_loss = losses.total_variation_loss(
generated) # use the unprocessed image
content_loss = FLAGS.content_weight * content_loss
style_loss = FLAGS.style_weight * style_loss
tv_loss = FLAGS.tv_weight * tv_loss
loss = style_loss + content_loss + tv_loss
"""Prepare to Train"""
global_step = tf.Variable(0, name="global_step", trainable=False)
variable_to_train = []
for variable in tf.trainable_variables():
if not (variable.name.startswith(FLAGS.loss_model)):
variable_to_train.append(variable)
lr = tf.train.exponential_decay(learning_rate=1e-1,
global_step=global_step,
decay_steps=num_steps_decay,
decay_rate=1e-1,
staircase=True)
optimizer = tf.train.AdamOptimizer(learning_rate=lr, epsilon=1e-8)
train_op = optimizer.minimize(loss,
global_step=global_step,
var_list=variable_to_train)
#train_op = tf.train.AdamOptimizer(1e-3).minimize(loss, global_step=global_step, var_list=variable_to_train)
variables_to_restore = []
for v in tf.global_variables():
if not (v.name.startswith(FLAGS.loss_model)):
variables_to_restore.append(v)
saver = tf.train.Saver(variables_to_restore)
sess.run([
tf.global_variables_initializer(),
tf.local_variables_initializer()
])
init_func = utils._get_init_fn(FLAGS)
init_func(sess)
last_file = tf.train.latest_checkpoint(training_path)
if last_file:
saver.restore(sess, last_file)
"""Start Training"""
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
try:
while not coord.should_stop():
_, c_loss, s_losses, t_loss, total_loss, step = sess.run([
train_op, content_loss, style_losses, tv_loss, loss,
global_step
])
"""logging"""
if step % 10 == 0:
print(step, c_loss, s_losses, t_loss, total_loss)
"""checkpoint"""
if step % 10000 == 0:
saver.save(sess,
os.path.join(training_path, 'fast-style-model'),
global_step=step)
if step == FLAGS.max_iter:
saver.save(
sess,
os.path.join(training_path, 'fast-style-model-done'))
break
except tf.errors.OutOfRangeError:
saver.save(sess,
os.path.join(training_path, 'fast-style-model-done'))
tf.logging.info('Done training -- epoch limit reached')
finally:
coord.request_stop()
coord.join(threads)
def main(FLAGS):
style_features_t = losses.get_style_features(FLAGS)
# Make sure the training path exists.
training_path = os.path.join(FLAGS.model_path, FLAGS.naming)
if not(os.path.exists(training_path)):
os.makedirs(training_path)
with tf.Graph().as_default():
with tf.Session() as sess:
"""Build Network"""
network_fn = nets_factory.get_network_fn(
FLAGS.loss_model,
num_classes=1,
is_training=False)
image_preprocessing_fn, image_unprocessing_fn = preprocessing_factory.get_preprocessing(
FLAGS.loss_model,
is_training=False)
processed_images = reader.image(FLAGS.batch_size, FLAGS.image_size, FLAGS.image_size,
'train2014/', image_preprocessing_fn, epochs=FLAGS.epoch)
generated = model.net(processed_images, training=True)
processed_generated = [image_preprocessing_fn(image, FLAGS.image_size, FLAGS.image_size)
for image in tf.unstack(generated, axis=0, num=FLAGS.batch_size)
]
processed_generated = tf.stack(processed_generated)
_, endpoints_dict = network_fn(tf.concat([processed_generated, processed_images], 0), spatial_squeeze=False)
# Log the structure of loss network
tf.logging.info('Loss network layers(You can define them in "content_layers" and "style_layers"):')
for key in endpoints_dict:
tf.logging.info(key)
"""Build Losses"""
content_loss = losses.content_loss(endpoints_dict, FLAGS.content_layers)
style_loss, style_loss_summary = losses.style_loss(endpoints_dict, style_features_t, FLAGS.style_layers)
tv_loss = losses.total_variation_loss(generated) # use the unprocessed image
loss = FLAGS.style_weight * style_loss + FLAGS.content_weight * content_loss + FLAGS.tv_weight * tv_loss
# Add Summary for visualization in tensorboard.
"""Add Summary"""
tf.summary.scalar('losses/content_loss', content_loss)
tf.summary.scalar('losses/style_loss', style_loss)
tf.summary.scalar('losses/regularizer_loss', tv_loss)
tf.summary.scalar('weighted_losses/weighted_content_loss', content_loss * FLAGS.content_weight)
tf.summary.scalar('weighted_losses/weighted_style_loss', style_loss * FLAGS.style_weight)
tf.summary.scalar('weighted_losses/weighted_regularizer_loss', tv_loss * FLAGS.tv_weight)
tf.summary.scalar('total_loss', loss)
for layer in FLAGS.style_layers:
tf.summary.scalar('style_losses/' + layer, style_loss_summary[layer])
tf.summary.image('generated', generated)
# tf.image_summary('processed_generated', processed_generated) # May be better?
tf.summary.image('origin', tf.stack([
image_unprocessing_fn(image) for image in tf.unstack(processed_images, axis=0, num=FLAGS.batch_size)
]))
summary = tf.summary.merge_all()
writer = tf.summary.FileWriter(training_path)
"""Prepare to Train"""
global_step = tf.Variable(0, name="global_step", trainable=False)
variable_to_train = []
for variable in tf.trainable_variables():
if not(variable.name.startswith(FLAGS.loss_model)):
variable_to_train.append(variable)
train_op = tf.train.AdamOptimizer(1e-3).minimize(loss, global_step=global_step, var_list=variable_to_train)
variables_to_restore = []
for v in tf.global_variables():
if not(v.name.startswith(FLAGS.loss_model)):
variables_to_restore.append(v)
saver = tf.train.Saver(variables_to_restore, write_version=tf.train.SaverDef.V1)
sess.run([tf.global_variables_initializer(), tf.local_variables_initializer()])
# Restore variables for loss network.
init_func = utils._get_init_fn(FLAGS)
init_func(sess)
# Restore variables for training model if the checkpoint file exists.
last_file = tf.train.latest_checkpoint(training_path)
if last_file:
tf.logging.info('Restoring model from {}'.format(last_file))
saver.restore(sess, last_file)
"""Start Training"""
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
start_time = time.time()
try:
while not coord.should_stop():
_, loss_t, step = sess.run([train_op, loss, global_step])
elapsed_time = time.time() - start_time
start_time = time.time()
"""logging"""
# print(step)
if step % 10 == 0:
tf.logging.info('step: %d, total Loss %f, secs/step: %f' % (step, loss_t, elapsed_time))
"""summary"""
if step % 25 == 0:
tf.logging.info('adding summary...')
summary_str = sess.run(summary)
writer.add_summary(summary_str, step)
writer.flush()
"""checkpoint"""
if step % 1000 == 0:
saver.save(sess, os.path.join(training_path, 'fast-style-model.ckpt'), global_step=step)
except tf.errors.OutOfRangeError:
saver.save(sess, os.path.join(training_path, 'fast-style-model.ckpt-done'))
tf.logging.info('Done training -- epoch limit reached')
finally:
coord.request_stop()
coord.join(threads)
def train(**kwargs):
opt = Config()
for k_, v_ in kwargs.items():
setattr(opt, k_, v_)
'''数据加载'''
# 读取文件名
filenames = [os.path.join(opt.data_root, f)
for f in os.listdir(opt.data_root)
if os.path.isfile(os.path.join(opt.data_root, f))]
# 判断文件格式，png为True，jpeg为False
png = filenames[0].lower().endswith('png') # If first file is a png, assume they all are
# 维持文件名队列
filename_queue = tf.train.string_input_producer(filenames, shuffle=True, num_epochs=opt.epoches)
# 初始化阅读器
reader = tf.WholeFileReader()
# 返回tuple，是key-value对
_, img_bytes = reader.read(filename_queue)
# 图片格式解码
image_row = tf.image.decode_png(img_bytes, channels=3) if png else tf.image.decode_jpeg(img_bytes, channels=3)
# 预处理
image = utils.img_proprocess(image_row, opt.image_size)
image_batch = tf.train.batch([image], opt.batch_size, dynamic_pad=True)
'''生成式网络生成数据'''
generated = net(image_batch, training=True)
generated = tf.image.resize_bilinear(generated, [opt.image_size, opt.image_size], align_corners=False)
generated.set_shape([opt.batch_size, opt.image_size, opt.image_size, 3])
# unstack将指定维度拆分为1后降维，split随意指定拆分后维度值且不会自动降维
# processed_generated = tf.stack([utils.img_proprocess(tf.squeeze(img, axis=0), opt.image_size)
# for img in tf.split(generated, num_or_size_splits=opt.batch_size, axis=0)])
processed_generated = tf.stack([utils.img_proprocess(img, opt.image_size) for img in tf.unstack(generated, axis=0)])
'''数据流经损失网络_VGG'''
# 一次送入数据量为2×batch_size：[原始batch经生成式网络生成的数据 + 原始batch]
with slim.arg_scope(vgg.vgg_arg_scope(weight_decay=0.0)): # 调用
_, endpoint = vgg.vgg_16(tf.concat([processed_generated, image_batch], 0),
num_classes=1, is_training=False, spatial_squeeze=False)
tf.logging.info('Loss network layers(You can define them in "content_layers" and "style_layers"):')
for key in endpoint:
tf.logging.info(key)
'''损失函数构建'''
style_gram = utils.get_style_feature(opt.style_path,
opt.image_size,
opt.style_layers,
opt.model_path,
opt.exclude_scopes)
content_loss, content_loss_summary = losses.content_loss(endpoint, opt.content_layers)
style_loss, style_loss_summary = losses.style_loss(endpoint, style_gram, opt.style_layers)
tv_loss = losses.total_variation_loss(generated) # use the unprocessed image, 我们想要的图像也是这个
loss = opt.style_weight * style_loss + opt.content_weight * content_loss + opt.tv_weight * tv_loss
'''优化器构建'''
# 优化器维护非vgg16的可训练变量
variables_to_train = []
for variable in tf.trainable_variables():
if not (variable.name.startswith("vgg_16")): # "vgg16"
variables_to_train.append(variable)
global_step = tf.Variable(0, name="global_step", trainable=False)
train_op = tf.train.AdamOptimizer(1e-3).minimize(loss, global_step=global_step, var_list=variables_to_train)
'''存储器构建'''
# 存储器保存非vgg16的全局变量
# tf.global_variables()：返回全局变量。
# 全局变量是分布式环境中跨计算机共享的变量。该Variable()构造函数或get_variable()
# 自动将新变量添加到图形集合：GraphKeys.GLOBAL_VARIABLES。这个方便函数返回该集合的内容。
# 全局变量的替代方法是局部变量。参考：tf.local_variables
variables_to_restore = [] # 比trainable多出的主要是用于bp的变量
for variable in tf.global_variables():
if not (variable.name.startswith("vgg_16")): # "vgg16"
variables_to_restore.append(variable)
saver = tf.train.Saver(var_list=variables_to_restore, write_version=tf.train.SaverDef.V2)
"""添加监测项"""
# 添加总体loss监测
tf.summary.scalar('losses/content_loss', content_loss)
tf.summary.scalar('losses/style_loss', style_loss)
tf.summary.scalar('losses/regularizer_loss', tv_loss)
tf.summary.scalar('weighted_losses/weighted_content_loss', content_loss * opt.content_weight)
tf.summary.scalar('weighted_losses/weighted_style_loss', style_loss * opt.style_weight)
tf.summary.scalar('weighted_losses/weighted_regularizer_loss', tv_loss * opt.tv_weight)
tf.summary.scalar('total_loss', loss)
# 添加各层style loss监测
for layer in opt.style_layers:
tf.summary.scalar('style_losses/' + layer, style_loss_summary[layer])
# 监测生成图监测
tf.summary.image('generated', generated)
# tf.image_summary('processed_generated', processed_generated) # May be better?
# 添加原图监测
tf.summary.image('origin', image_batch)
summary_path = "./logs"
model_path = "./logs/model"
summary = tf.summary.merge_all()
# with open('train_v.txt', 'w') as f:
# for s in variable_to_train:
# f.write(s.name + '\n')
# with open('restore_v.txt', 'w') as f:
# for s in variables_to_restore:
# f.write(s.name + '\n')
'''训练'''
with tf.Session(config=config) as sess:
writer = tf.summary.FileWriter(summary_path, sess.graph)
sess.run(tf.group(tf.global_variables_initializer(),
tf.local_variables_initializer()))
# vgg网络预训练参数载入
param_init_fn = utils.param_load_fn(opt.model_path, opt.exclude_scopes)
param_init_fn(sess)
# 由于使用saver，故载入变量不包含vgg16相关变量
if not os.path.exists(model_path):
os.makedirs(model_path)
ckpt = tf.train.get_checkpoint_state(model_path)
if ckpt:
tf.logging.info("Success to read {}".format(ckpt.model_checkpoint_path))
saver.restore(sess, ckpt.model_checkpoint_path)
else:
tf.logging.info("Failed to find a checkpoint")
coord = tf.train.Coordinator() # 线程控制器
threads = tf.train.start_queue_runners(coord=coord) # 启动队列
start_time = time.time() # 计时开始
try:
while not coord.should_stop():
_, loss_t, step = sess.run([train_op, loss, global_step])
elapsed_time = time.time() - start_time
start_time = time.time()
if step % 50 == 0:
tf.logging.info('step: {0:d}, total Loss {1:.2f}, secs/step: {2:.3f}'.
format(step, loss_t, elapsed_time))
if step % 100 == 0:
tf.logging.info('adding summary...')
summary_str = sess.run(summary)
writer.add_summary(summary_str, step)
writer.flush()
if step % 1000 == 0:
saver.save(sess, os.path.join(model_path, 'fast_style_model'), global_step=step)
except tf.errors.OutOfRangeError:
saver.save(sess, os.path.join(model_path, 'fast_style_model'))
tf.logging.info('Epoch limit reached')
finally:
coord.request_stop()
coord.join(threads)
writer.close()
'''调试输出'''
