我按照本网站的说明训练了一个包含12个风格图像的模型： https://github.com/tensorflow/magenta/tree/master/magenta/models/image_stylization
但是，检查点输出非常大： model.ckpt-0.data-00000-of-00001（574MB）
他们提供的预训练模型，如Monet.ckpt和Varied.ckpt，分别只有6.8MB和7.1MB。如何将我的模型从574MB显着缩小到像预训练模型那样的小尺寸？
代码在这里：
"""Trains the N-styles style transfer model."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import ast
import os
# internal imports
import tensorflow as tf
from tensorflow.core.protobuf import saver_pb2
from magenta.models.image_stylization import image_utils
from magenta.models.image_stylization import learning
from magenta.models.image_stylization import model
from magenta.models.image_stylization import vgg
slim = tf.contrib.slim
DEFAULT_CONTENT_WEIGHTS = '{"vgg_16/conv3": 1.0}'
DEFAULT_STYLE_WEIGHTS = ('{"vgg_16/conv1": 1e-4, "vgg_16/conv2": 1e-4,'
' "vgg_16/conv3": 1e-4, "vgg_16/conv4": 1e-4}')
flags = tf.app.flags
flags.DEFINE_float('clip_gradient_norm', 0, 'Clip gradients to this norm')
flags.DEFINE_float('learning_rate', 1e-3, 'Learning rate')
flags.DEFINE_integer('batch_size', 16, 'Batch size.')
flags.DEFINE_integer('image_size', 256, 'Image size.')
flags.DEFINE_integer('ps_tasks', 0,
'Number of parameter servers. If 0, parameters '
'are handled locally by the worker.')
flags.DEFINE_integer('num_styles', 12, 'Number of styles.')
flags.DEFINE_integer('save_summaries_secs', 600,
'Frequency at which summaries are saved, in seconds.')
flags.DEFINE_integer('save_interval_secs', 600,
'Frequency at which the model is saved, in seconds.')
flags.DEFINE_integer('task', 0,
'Task ID. Used when training with multiple '
'workers to identify each worker.')
flags.DEFINE_integer('train_steps', 2, 'Number of training steps.')
flags.DEFINE_string('content_weights', DEFAULT_CONTENT_WEIGHTS,
'Content weights')
flags.DEFINE_string('master', '',
'Name of the TensorFlow master to use.')
flags.DEFINE_string('style_coefficients', None,
'Scales the style weights conditioned on the style image.')
flags.DEFINE_string('style_dataset_file', '/Users/guanjhensu/miniconda2/envs/magenta/lib/python2.7/site-packages/magenta/models/image_stylization/style_images_01.tfrecord', 'Style dataset file.')
flags.DEFINE_string('style_weights', DEFAULT_STYLE_WEIGHTS, 'Style weights')
flags.DEFINE_string('train_dir', '/Users/guanjhensu/miniconda2/envs/magenta/lib/python2.7/site-packages/magenta/models/image_stylization/train_checkpoint',
'Directory for checkpoints and summaries.')
FLAGS = flags.FLAGS
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)
def console_entry_point():
tf.app.run(main)
if __name__ == '__main__':
console_entry_point()