def _build_model(self, inputs, is_training=True):
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope(is_training=is_training)):
logits, endpoints = mobilenet_v2.mobilenet(inputs, num_classes=self.config.num_outputs)
ema = tf.train.ExponentialMovingAverage(0.999)
self.mobile_net_vars = [var for var in tf.trainable_variables() if var.name.startswith("Mobilenet") and
"Logits" not in var.name]
return logits, endpoints
def net(image, classes):
#encoding - convolution/pooling
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope(is_training=True)):
logits, endpoints = mobilenet_v2.mobilenet(image, num_classes=None)
logits = endpoints["layer_10/output"]
print(logits.get_shape())
#new_size = (16,32)
#resize = tf.image.resize(logits, new_size, align_corners=True)
#conv = util.conv(resize, [3,3,512,320], "up_1", pad="SAME")
#new_size = (64,128)
#resize = tf.image.resize(logits, new_size, align_corners=True)
#conv = util.conv(resize, [3,3,256,512], "up_2", pad="SAME")
new_size = (192,256)
resize = tf.image.resize(logits, new_size, align_corners=True)
conv = util.conv(resize, [3,3,128,256], "up_3", pad="SAME")
conv6 = util.conv(conv, [1,1,128,classes], "c6", pad="SAME")
softmax = tf.nn.softmax(conv6)
return conv6, tf.argmax(softmax, axis=3), softmax
def load_mobilenet_v2(model_dir, sess):
model_url = "https://storage.googleapis.com/mobilenet_v2/checkpoints/mobilenet_v2_1.4_224.tgz"
filename = model_url.split("/")[-1]
filepath = os.path.join(model_dir, filename.split(".tgz")[0])
try:
utils.download_pretrained_model_weights(model_url,
filepath,
unzip=True)
except:
print("Pre-training weights download failed!")
model_file_name = "mobilenet_v2_1.4_224.ckpt"
model_path = os.path.join(filepath, model_file_name)
resized_input_tensor = tf.placeholder(tf.float32,
shape=[None, None, None, 3])
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope()):
bottleneck_tensor, _ = mobilenet_v2.mobilenet(resized_input_tensor,
num_classes=None,
depth_multiplier=1.4)
variable_restore_op = tf.contrib.slim.assign_from_checkpoint_fn(
model_path,
tf.contrib.slim.get_trainable_variables(),
ignore_missing_vars=True)
variable_restore_op(sess)
# bottleneck_tensor = tf.squeeze(bottleneck_tensor, axis=[1, 2])
bottleneck_tensor_size = 1792
return bottleneck_tensor, resized_input_tensor, bottleneck_tensor_size
def __init__(self, checkpoint='../mobilenet_v2_1.0_224.ckpt'):
# save the checkpoint
self.checkpoint = checkpoint
tf.reset_default_graph()
# placeholder for the image input, need to decode the file
self.file_in = tf.placeholder(tf.string, ())
image = tf.image.decode_jpeg(tf.read_file(self.file_in))
# expand for batch then cast to between -1 and 1
inputs = tf.expand_dims(image, 0)
inputs = (tf.cast(inputs, tf.float32) / 128) - 1
# ensure that it only has three dimensions and resize to 224x224
inputs.set_shape((None, None, None, 3))
inputs = tf.image.resize_images(inputs, (224, 224))
# get the endpoints of the network
with tf.contrib.slim.arg_scope(
mobilenet_v2.training_scope(is_training=False)):
_, self.endpoints = mobilenet_v2.mobilenet(inputs)
# Restore using exponential moving average since it produces (1.5-2%) higher
# accuracy
ema = tf.train.ExponentialMovingAverage(0.999)
vars = ema.variables_to_restore()
saver = tf.train.Saver(vars)
# create the label map from imagenet, same thing
self.label_map = imagenet.create_readable_names_for_imagenet_labels()
# create session and restore the checkpoint downloaded
self.sess = tf.Session()
saver.restore(self.sess, self.checkpoint)
def create_inference_graph(self, input_image, base_graph):
util.download(self.params.CHECKPOINT_TARBALL_URI, self.params.MODEL_BASEDIR)
self.graph = base_graph
with self.graph.as_default():
input_image = tf.cast(input_image, tf.float32) / 128. - 1
input_image.set_shape(self.params.INPUT_TENSOR_SHAPE)
from nets.mobilenet import mobilenet_v2
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope(is_training=False)):
# See also e.g. mobilenet_v2_035
self.logits, self.endpoints = mobilenet_v2.mobilenet(
input_image,
is_training=False,
depth_multiplier=self.params.DEPTH_MULTIPLIER,
finegrain_classification_mode=self.params.FINE)
# Per authors: Restore using exponential moving average since it produces
# (1.5-2%) higher accuracy
ema = tf.train.ExponentialMovingAverage(0.999)
vs = ema.variables_to_restore()
saver = tf.train.Saver(vs)
checkpoint = os.path.join(
self.params.MODEL_BASEDIR,
self.params.CHECKPOINT + '.ckpt')
nodes = list(self.output_names) + [input_image]
self.graph = util.give_me_frozen_graph(
checkpoint,
nodes=self.output_names,
base_graph=self.graph,
saver=saver)
return self.graph
def __call__(self, inputs, castFromUint8=True):
pr_shape = lambda var : print(var.shape)
if castFromUint8:
inputs = tf.cast(inputs, self.dtype)
# print(inputs.dtype)
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope(
is_training=self.is_training)):
# print(inputs.dtype)
global_pool, endpoints = mobilenet_v2.mobilenet(inputs, num_classes=None)
self.variables_to_restore = slim.get_variables() # len 260
# 后加两层fc
dropout_keep_prob = 0.5
weight_decay = 0.05
with tf.variable_scope('additional', 'fc'):
# flatten = tf.flatten(endpoints['global_pool'])
flatten = slim.flatten(global_pool)
with slim.arg_scope([slim.fully_connected],
weights_regularizer=slim.l2_regularizer(weight_decay),
weights_initializer = tc.layers.xavier_initializer(tf.float32),
# weights_initializer=tf.truncated_normal_initializer(stddev=0.1),
activation_fn=None) as sc:
net = slim.fully_connected(flatten, 128, activation_fn=None, scope='fc1')
net = slim.dropout(net, dropout_keep_prob, is_training=self.is_training, scope='dropout')
logits = slim.fully_connected(net, self.n_classes, activation_fn=None, scope='fc2')
# 多出来的4个参数保存 共264
self.variables_to_save = slim.get_variables()
for var in self.variables_to_save:
if var in self.variables_to_restore:
continue
self.variables_to_train.append(var)
# pr_shape(out)
return logits
def training_scope(weight_decay, is_training, stddev, dropout_keep_prob,
bn_decay):
return mobilenet_v2_builder.training_scope(
weight_decay=weight_decay,
is_training=is_training,
stddev=stddev,
dropout_keep_prob=dropout_keep_prob,
bn_decay=bn_decay)
def Encoder_mobilenet(x, is_training=True, weight_decay=0.001, reuse=False):
# from nets.mobilenet import mobilenet_v2
from nets.mobilenet import mobilenet_v2
with slim.arg_scope(mobilenet_v2.training_scope()):
net, endpoints = mobilenet_v2.mobilenet(x)
variables = tf.contrib.framework.get_variables('mobilenet_v2')
return net, variables
def train_kfold(record_file, train_log_step, train_param, val_log_step,
num_classes, data_shape, snapshot, snapshot_prefix):
[base_lr, max_steps] = train_param
[batch_size, resize_height, resize_width, depths] = data_shape
# ============================================================================================================
# Define the model: [core]
with slim.arg_scope(
mobilenet_v2.training_scope(dropout_keep_prob=R.dropout)):
out, end_points = mobilenet_v2.mobilenet(
input_tensor=input_images,
num_classes=num_classes,
depth_multiplier=R.depth_multiplier,
is_training=is_training)
# Specify the loss function: tf.losses定义的loss函数都会自动添加到loss函数, 无需 # slim.losses.add_loss(my_loss)
tf.losses.softmax_cross_entropy(onehot_labels=input_labels,
logits=out) # 添加交叉熵损失loss=1.6
loss = tf.losses.get_total_loss(
add_regularization_losses=True) # 添加正则化损失loss=2.2
accuracy = tf.reduce_mean(
tf.cast(tf.equal(tf.argmax(out, 1), tf.argmax(input_labels, 1)),
tf.float32))
# Specify the optimization scheme:
optimizer = tf.train.GradientDescentOptimizer(learning_rate=base_lr)
'''
global_step = tf.Variable(0, trainable=False)
learning_rate = tf.train.exponential_decay(0.05, global_step, 150, 0.9)
optimizer = tf.train.MomentumOptimizer(learning_rate, 0.9)
train_tensor = optimizer.minimize(loss, global_step)
train_op = slim.learning.create_train_op(loss, optimizer, global_step=global_step)
'''
# 在定义训练的时�? 注意到我们使用了`batch_norm`层时,需要更新每一层的`average`和`variance`参数,
# 更新的过程不包含在正常的训练过程�? 需要我们去手动像下面这样更�? # 通过`tf.get_collection`获得所有需要更新的`op`
# update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
# 使用`tensorflow`的控制流, 先执行更新算�? 再执行训�?
# with tf.control_dependencies(update_ops):
# create_train_op that ensures that when we evaluate it to get the loss,
# the update_ops are done and the gradient updates are computed.
train_op = slim.learning.create_train_op(total_loss=loss,
optimizer=optimizer)
# ================================================================================================================
# 从record中读取图片和labels数据
all_nums = get_example_nums(record_file)
all_images, all_labels = read_records(record_file,
resize_height,
resize_width,
type='normalization',
is_train=None)
all_images_batch, all_labels_batch = get_batch_images(
all_images,
all_labels,
batch_size=batch_size,
labels_nums=num_classes,
one_hot=True,
shuffle=True)
def _image_to_head(self, is_training, reuse=None):
with slim.arg_scope(mobilenet_v2.training_scope(is_training=is_training)):
net, endpoints = mobilenet_v2.mobilenet_base(self._image, conv_defs=CTPN_DEF)
self.variables_to_restore = slim.get_variables_to_restore()
self._act_summaries.append(net)
self._layers['head'] = net
return net
def inspect_module():
features = tf.zeros([8, 224, 224, 3], name='input')
with tf.variable_scope('TestSSD',
default_name=None,
values=[features],
reuse=tf.AUTO_REUSE):
with tf.contrib.slim.arg_scope(
mobilenet_v2.training_scope(is_training=False)):
logits, endpoints = mobilenet_v2.mobilenet(features)
for key in endpoints:
print(key, endpoints[key])
def extract_features(self, preprocessed_inputs):
"""Extract features from preprocessed inputs.
Args:
preprocessed_inputs: a [batch, height, width, channels] float tensor
representing a batch of images.
Returns:
feature_maps: a list of tensors where the ith tensor has shape
[batch, height_i, width_i, depth_i]
"""
preprocessed_inputs = shape_utils.check_min_image_dim(
33, preprocessed_inputs)
feature_map_layout = {
'from_layer':
['layer_15/expansion_output', 'layer_19', '', '', '', ''],
'layer_depth': [-1, -1, 512, 256, 256, 128],
'use_depthwise': self._use_depthwise,
'use_explicit_padding': self._use_explicit_padding,
}
with tf.variable_scope('MobilenetV2',
reuse=self._reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=None, bn_decay=0.9997)), \
slim.arg_scope(
[mobilenet.depth_multiplier], min_depth=self._min_depth):
with (slim.arg_scope(self._conv_hyperparams_fn())
if self._override_base_feature_extractor_hyperparams else
context_manager.IdentityContextManager()):
# TODO(b/68150321): Enable fused batch norm once quantization
# supports it.
with slim.arg_scope([slim.batch_norm], fused=False):
_, image_features = mobilenet_v2.mobilenet_base(
ops.pad_to_multiple(preprocessed_inputs,
self._pad_to_multiple),
final_endpoint='layer_19',
depth_multiplier=self._depth_multiplier,
use_explicit_padding=self._use_explicit_padding,
scope=scope)
with slim.arg_scope(self._conv_hyperparams_fn()):
# TODO(b/68150321): Enable fused batch norm once quantization
# supports it.
with slim.arg_scope([slim.batch_norm], fused=False):
feature_maps = feature_map_generators.multi_resolution_feature_maps(
feature_map_layout=feature_map_layout,
depth_multiplier=self._depth_multiplier,
min_depth=self._min_depth,
insert_1x1_conv=True,
image_features=image_features)
return feature_maps.values()
def _image_to_head(self, is_training, reuse=None):
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=is_training)):
net, endpoints = mobilenet_v2.mobilenet_base(self._image,
conv_defs=CTPN_DEF)
self.variables_to_restore = slim.get_variables_to_restore()
self._act_summaries.append(net)
self._layers['head'] = net
return net
def MobileNet(depth_multiplier, imgs_in, weight_decay, batch_norm_momentum,
is_training):
with tf.contrib.slim.arg_scope(
mobilenet_v2.training_scope(is_training=is_training,
weight_decay=weight_decay,
bn_decay=batch_norm_momentum)):
features, _ = mobilenet_v2.mobilenet_base(
imgs_in,
depth_multiplier=depth_multiplier,
finegrain_classification_mode=depth_multiplier < 1,
output_stride=16)
return features
def extract_features(self, preprocessed_inputs):
"""Extract features from preprocessed inputs.
Args:
preprocessed_inputs: a [batch, height, width, channels] float tensor
representing a batch of images.
Returns:
feature_maps: a list of tensors where the ith tensor has shape
[batch, height_i, width_i, depth_i]
"""
preprocessed_inputs = shape_utils.check_min_image_dim(
33, preprocessed_inputs)
feature_map_layout = {
'from_layer': ['layer_15/expansion_output', 'layer_19', '', '', '', ''],
'layer_depth': [-1, -1, 512, 256, 256, 128],
'use_depthwise': self._use_depthwise,
'use_explicit_padding': self._use_explicit_padding,
}
with tf.variable_scope('MobilenetV2', reuse=self._reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=None, bn_decay=0.9997)), \
slim.arg_scope(
[mobilenet.depth_multiplier], min_depth=self._min_depth):
with (slim.arg_scope(self._conv_hyperparams_fn())
if self._override_base_feature_extractor_hyperparams else
context_manager.IdentityContextManager()):
# TODO(b/68150321): Enable fused batch norm once quantization
# supports it.
with slim.arg_scope([slim.batch_norm], fused=False):
_, image_features = mobilenet_v2.mobilenet_base(
ops.pad_to_multiple(preprocessed_inputs, self._pad_to_multiple),
final_endpoint='layer_19',
depth_multiplier=self._depth_multiplier,
use_explicit_padding=self._use_explicit_padding,
scope=scope)
with slim.arg_scope(self._conv_hyperparams_fn()):
# TODO(b/68150321): Enable fused batch norm once quantization
# supports it.
with slim.arg_scope([slim.batch_norm], fused=False):
feature_maps = feature_map_generators.multi_resolution_feature_maps(
feature_map_layout=feature_map_layout,
depth_multiplier=self._depth_multiplier,
min_depth=self._min_depth,
insert_1x1_conv=True,
image_features=image_features)
return feature_maps.values()
def encode(self, input_tensor, name):
"""
根据MobileNet框架对输入的tensor进行编码
:param input_tensor:
:param name:
:param flags:
:return: 输出MobileNet编码特征
"""
ret = OrderedDict()
with tf.variable_scope(name):
with tf.contrib.slim.arg_scope(
mobilenet_v2.training_scope(is_training=True)):
net, end_points = mobilenet_v2.mobilenet(input_tensor,
base_only=True)
# # Version B
# ret['layer_5'] = dict()
# ret['layer_5']['data'] = end_points['layer_5']
# ret['layer_5']['shape'] = end_points['layer_5'].get_shape().as_list()
#
#
# ret['layer_8'] = dict()
# ret['layer_8']['data'] = end_points['layer_8']
# ret['layer_8']['shape'] = end_points['layer_8'].get_shape().as_list()
#
#
# ret['layer_18'] = dict()
# ret['layer_18']['data'] = end_points['layer_18']
# ret['layer_18']['shape'] = end_points['layer_18'].get_shape().as_list()
# Version A
ret['layer_7'] = dict()
ret['layer_7']['data'] = end_points['layer_7']
ret['layer_7']['shape'] = end_points['layer_7'].get_shape(
).as_list()
ret['layer_14'] = dict()
ret['layer_14']['data'] = end_points['layer_14']
ret['layer_14']['shape'] = end_points['layer_14'].get_shape(
).as_list()
ret['layer_19'] = dict()
ret['layer_19']['data'] = end_points['layer_19']
ret['layer_19']['shape'] = end_points['layer_19'].get_shape(
).as_list()
# ret['end_points'] = end_points
return ret
def mobilenet_v2_140(inputs, is_training, opts):
if is_training:
with slim.arg_scope(mobilenet_v2.training_scope(
weight_decay=opts.weight_decay,
stddev=0.09,
bn_decay=opts.batch_norm_decay)):
return mobilenet_v2.mobilenet_v2_140(
inputs,
num_classes=opts.num_classes,
reuse=None)
else:
return mobilenet_v2.mobilenet_v2_140(
inputs,
num_classes=opts.num_classes,
reuse=None)
def mobilenet(images,
depth_multiplier=1.0,
is_training=True,
verbose=False,
**kwargs):
""" Base MobileNet architecture
Based on https://github.com/tensorflow/models/tree/master/research/slim/nets/mobilenet
Args:
images: input images in [0., 1.]
depth_multiplier: MobileNet depth multiplier.
is_training: training bool for batch norm
verbose: verbosity level
Kwargs:
weight_decay: Regularization constant. Defaults to 0.
normalizer_decay: Batch norm decay. Defaults to 0.9
"""
del kwargs
base_scope = tf.get_variable_scope().name
# Input in [0., 1.] -> [-1, 1]
with tf.control_dependencies([tf.assert_greater_equal(images, 0.)]):
with tf.control_dependencies([tf.assert_less_equal(images, 1.)]):
net = (images - 0.5) * 2.
# Mobilenet
with tf.contrib.slim.arg_scope(
mobilenet_v2.training_scope(is_training=is_training)):
if depth_multiplier == 1.0:
net, _ = mobilenet_v2.mobilenet(net, base_only=True)
elif depth_multiplier == 0.5:
net, _ = mobilenet_v2.mobilenet_v2_050(net, base_only=True)
elif depth_multiplier == 0.35:
net, _ = mobilenet_v2.mobilenet_v2_035(net, base_only=True)
# Add a saver to restore Imagenet-pretrained weights
saver_collection = '%s_mobilenet_%s_saver' % (base_scope, depth_multiplier)
savers = tf.get_collection(saver_collection)
if len(savers) == 0:
var_list = {
x.op.name.replace('%s/' % base_scope, ''): x
for x in tf.global_variables(scope=base_scope)
}
saver = tf.train.Saver(var_list=var_list)
tf.add_to_collection(saver_collection, saver)
return net
def compare_layer_output(net, layer_name, checkpoint, tensor_name, image_file):
### Compare outputs from the same layer (tensor)
### from caffe net and tensorflow graph
### matching name examples:
## tf: MobilenetV2/Conv/Conv2D:0, MobilenetV2/Conv/Relu6:0, MobilenetV2/Conv/BatchNorm/FusedBatchNorm:0
## caffe: conv1, conv1/relu, conv1/scale
def square_error(x, x_):
return np.sum(np.square(x - x_))
image = tf_preprocess(image_file)
## caffe inference
net.blobs['data'].data[...] = image[...]
net.forward()
caffe_output = net.blobs[layer_name].data
caffe_output = caffe_output.transpose(0, 2, 3, 1) # channel first to last
## tf inference
tf.reset_default_graph()
images = tf.placeholder(tf.float32,
shape=(None, image_scale, image_scale, 3))
with tf.contrib.slim.arg_scope(
mobilenet_v2.training_scope(is_training=False)):
logits, endpoints = mobilenet_v2.mobilenet(images, num_classes=1001)
ema = tf.train.ExponentialMovingAverage(0.999)
vars = ema.variables_to_restore()
saver = tf.train.Saver(vars)
with tf.Session() as sess:
saver.restore(sess, checkpoint)
tensor = sess.graph.get_tensor_by_name(tensor_name)
tf_output = sess.run(tensor, feed_dict={images: image})
### compare tf and caffe result of a specific layer
### need graphs and layer (tensor) name in caffe and tf
print('...................................')
error = 0
for i in range(32):
err = square_error(tf_output[0, :, :, i], caffe_output[0, :, :, i])
print('channel', i, err)
error += err
print('total error:', error)
print('...................................')
return
def getMobileNet(checkpoint):
graph = tf.Graph()
sess = tf.Session(graph=graph)
with graph.as_default():
file_input = tf.placeholder(tf.string, ())
image = tf.image.decode_image(tf.read_file(file_input))
images = tf.expand_dims(image, 0)
images = tf.cast(images, tf.float32) / 128. - 1
images.set_shape((None, None, None, 3))
images = tf.image.resize_images(images, (224, 224))
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope(is_training=False)):
logits, endpoints = mobilenet_v2.mobilenet(images)
ema = tf.train.ExponentialMovingAverage(0.999)
vars = ema.variables_to_restore()
saver = tf.train.Saver(vars)
saver.restore(sess, checkpoint)
return sess, graph, endpoints, file_input
def _extract_proposal_features(self, preprocessed_inputs, scope):
"""Extracts first stage RPN features.
Args:
preprocessed_inputs: A [batch, height, width, channels] float32 tensor
representing a batch of images.
scope: A scope name.
Returns:
rpn_feature_map: A tensor with shape [batch, height, width, depth]
activations: A dictionary mapping feature extractor tensor names to
tensors
Raises:
InvalidArgumentError: If the spatial size of `preprocessed_inputs`
(height or width) is less than 33.
ValueError: If the created network is missing the required activation.
"""
# print('###faster_rcnn_mobilenet_v2_feature_extractor.py### - extract_proposal_features')
preprocessed_inputs.get_shape().assert_has_rank(4)
preprocessed_inputs = shape_utils.check_min_image_dim(
min_dim=33, image_tensor=preprocessed_inputs)
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=self._train_batch_norm,
weight_decay=self._weight_decay)):
with tf.variable_scope('MobilenetV2',
reuse=self._reuse_weights) as scope:
params = {}
if self._skip_last_stride:
# Not called by default, will use conv_defs in slim.nets.mobilenet.mobilenet_v2
params[
'conv_defs'] = _get_mobilenet_conv_no_last_stride_defs(
conv_depth_ratio_in_percentage=self.
_conv_depth_ratio_in_percentage)
_, endpoints = mobilenet_v2.mobilenet_base(
preprocessed_inputs,
final_endpoint='layer_19', # actually 'MobilenetV2/Conv_1'
min_depth=self._min_depth,
depth_multiplier=self._depth_multiplier,
scope=scope,
**params)
return endpoints['layer_19'], endpoints
def load_mobilenet_v2(model_dir, sess):
model_file_name = "mobilenet_v2_1.4_224/mobilenet_v2_1.4_224.ckpt"
model_path = os.path.join(model_dir, model_file_name)
resized_input_tensor = tf.placeholder(tf.float32, shape=[None, None, None, 3])
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope()):
bottleneck_tensor, _ = mobilenet_v2.mobilenet(
resized_input_tensor, num_classes=None, depth_multiplier=1.4)
variable_restore_op = tf.contrib.slim.assign_from_checkpoint_fn(
model_path,
tf.contrib.slim.get_trainable_variables(),
ignore_missing_vars=True)
variable_restore_op(sess)
#bottleneck_tensor = tf.squeeze(bottleneck_tensor, axis=[1, 2])
bottleneck_tensor_size = 1792
return bottleneck_tensor, resized_input_tensor, bottleneck_tensor_size
def fcn_mobv2(images, num_classes, is_training=True):
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope()):
_, end_points = mobilenet_v2.mobilenet(images, num_classes)
for v, k in end_points.items():
print('{v}:{k}'.format(v=v, k=k))
# pool4=end_points['resnet_v1_101/pool4']
#
# dconv1_out=pool4.get_shape().as_list()
#
#
# deconv1=slim.conv2d_transpose(net,dconv1_out[3],[4,4], stride=2,scope='deconv1')
#
# fu1=tf.add(deconv1,pool4)
#
#
# pool3=end_points['resnet_v1_101/pool3']
# dconv2_out=pool3.get_shape().as_list()
# deconv2=slim.conv2d_transpose(fu1,dconv2_out[3],[4,4], stride=2,scope='deconv2')
#
# fu2=tf.add(deconv2,pool3)
net = end_points['layer_18']
# net_14=end_points['Conv2d_11_pointwise']
# net_28=end_points['Conv2d_5_pointwise']
# up1=slim.conv2d_transpose(net_7,2,[4,4], stride=2,scope='deconv32')
# fu1=tf.add(up1,net_14,name='fu1')
#
# up2=slim.conv2d_transpose(fu1,2,[4,4], stride=2,scope='deconv16')
# fu2=tf.add(up2,net_28,name='fu2')
logit = slim.conv2d_transpose(net,
2, [64, 64],
stride=32,
scope='deconv8')
prediction = tf.argmax(logit, dimension=3) #, name="prediction")
print('logit', logit)
return logit, tf.expand_dims(prediction, axis=3)
def _extract_box_classifier_features(self, proposal_feature_maps, scope):
"""Extracts second stage box classifier features.
Args:
proposal_feature_maps: A 4-D float tensor with shape
[batch_size * self.max_num_proposals, crop_height, crop_width, depth]
representing the feature map cropped to each proposal.
scope: A scope name (unused).
Returns:
proposal_classifier_features: A 4-D float tensor with shape
[batch_size * self.max_num_proposals, height, width, depth]
representing box classifier features for each proposal.
"""
net = proposal_feature_maps
conv_depth = 1024
if self._skip_last_stride:
conv_depth_ratio = float(
self._conv_depth_ratio_in_percentage) / 100.0
conv_depth = int(float(conv_depth) * conv_depth_ratio)
depth = lambda d: max(int(d * 1.0), 16)
with tf.variable_scope('MobilenetV2', reuse=self._reuse_weights):
with slim.arg_scope(
mobilenet_v2.training_scope(
is_training=self._train_batch_norm,
weight_decay=self._weight_decay)):
with slim.arg_scope([slim.conv2d, slim.separable_conv2d],
padding='SAME'):
net = slim.separable_conv2d(
net,
depth(conv_depth), [3, 3],
depth_multiplier=1,
stride=2,
scope='Conv_2') # or 'layer_20'
return slim.separable_conv2d(
net,
depth(conv_depth), [3, 3],
depth_multiplier=1,
stride=1,
scope='Conv_3') # or 'layer_21'
def _get_endpoints(model_name, img_tensor):
if model_name == "res50":
with slim.arg_scope(resnet_v1.resnet_arg_scope()):
_, end_points = resnet_v1.resnet_v1_50(img_tensor,
1000,
is_training=False)
return end_points["predictions"]
elif model_name == "res152":
with slim.arg_scope(resnet_v1.resnet_arg_scope()):
_, end_points = resnet_v1.resnet_v1_152(img_tensor,
1000,
is_training=False)
return end_points["predictions"]
elif model_name.startswith("mobilenet"):
with tf.contrib.slim.arg_scope(
mobilenet_v2.training_scope(is_training=False)):
_, endpoints = mobilenet_v2.mobilenet(img_tensor)
return endpoints["Predictions"]
def extract_features(self, inputs):
"""Extracts features from inputs.
This function adds 4 additional feature maps on top of
'layer_15/expansion_output' and 'layer_19' in the base Mobilenet v2 network.
Args:
inputs: a tensor of shape [batch_size, height, with, channels],
holding the input images.
Returns:
a list of 6 float tensors of shape [batch_size, height, width, channels],
holding feature map tensors to be fed to box predictor.
"""
feature_map_specs_dict = {
'layer_name': ['layer_15/expansion_output', 'layer_19',
None, None, None, None],
'layer_depth': [None, None, 512, 256, 256, 128]}
with tf.variable_scope('MobilenetV2', reuse=self._reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=None, bn_decay=0.9997)):
_, end_points = mobilenet_v2.mobilenet_base(
inputs,
final_endpoint='layer_19',
depth_multiplier=self._depth_multiplier,
scope=scope)
with slim.arg_scope(self._conv_hyperparams_fn()):
feature_maps = feature_map_generators.ssd_feature_maps(
feature_map_tensor_dict=end_points,
feature_map_specs_dict=feature_map_specs_dict,
depth_multiplier=1,
use_depthwise=self._use_depthwise,
insert_1x1_conv=True)
feature_map_list = list(feature_maps.values())
return feature_map_list
def _extract_proposal_features(self, preprocessed_inputs, scope):
"""Extracts first stage RPN features.
Args:
preprocessed_inputs: A [batch, height, width, channels] float32 tensor
representing a batch of images.
scope: A scope name.
Returns:
rpn_feature_map: A tensor with shape [batch, height, width, depth]
activations: A dictionary mapping feature extractor tensor names to
tensors
Raises:
InvalidArgumentError: If the spatial size of `preprocessed_inputs`
(height or width) is less than 33.
ValueError: If the created network is missing the required activation.
"""
preprocessed_inputs = shape_utils.check_min_image_dim(
33, preprocessed_inputs)
with tf.variable_scope('MobilenetV2',
reuse=self._reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=None, bn_decay=0.9997)), \
slim.arg_scope(
[mobilenet.depth_multiplier], min_depth=self._min_depth):
_, activations = mobilenet_v2.mobilenet_base(
preprocessed_inputs,
final_endpoint='layer_19',
min_depth=self._min_depth,
depth_multiplier=self._depth_multiplier,
scope=scope)
return activations['layer_19'], activations
#1.2、先构建图结构，再加载权重
#临时添加slim到python搜索路径
import sys
sys.path.append('./models/research/slim')
#导入mobilenet_v2
from nets.mobilenet import mobilenet_v2
#重置图
tf.reset_default_graph()
#导入mobilenet，先构建图结构
#加载完毕后，tf.get_default_graph()中包含了mobilenet计算图结构，可以使用tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES)对比reset_graph前后的差异
images = tf.placeholder(tf.float32,(None, 224, 224, 3))
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope(is_training = False)):
logits, endpoints = mobilenet_v2.mobilenet(images, depth_multiplier = 1.4)
#定义saver类，用于恢复图权重
saver = tf.train.Saver()
with tf.Session() as sess:
#latest_checkpoint检查checkpoint检查点文件，查找最新的模型
#restore恢复图权重
saver.restore(sess, tf.train.latest_checkpoint('./model_ckpt/moilenet_v2'))
#get_tensor_by_name通过张量名称获取张量
print(sess.run(tf.get_default_graph().get_tensor_by_name('MoilenetV2/Conv/weights:0')).shape)
#1.3、frozen inference
"""
pb文件将变量取值和计算图整个结构统一放在一个文件中，通过convert_variable_to_constants
tf.reset_default_graph()
# For simplicity we just decode jpeg inside tensorflow.
# But one can provide any input obviously.
file_input = tf.placeholder(tf.string, ())
image = tf.image.decode_jpeg(tf.read_file(file_input))
images = tf.expand_dims(image, 0)
images = tf.cast(images, tf.float32) / 128. - 1
images.set_shape((None, None, None, 3))
images = tf.image.resize_images(images, (224, 224))
# images = tf.placeholder(tf.float32, (None, 224, 224, 3))
# Note: arg_scope is optional for inference.
with tf.contrib.slim.arg_scope(mobilenet_v2.training_scope(is_training=False)):
logits, endpoints = mobilenet_v2.mobilenet(images)
# Restore using exponential moving average since it produces (1.5-2%) higher
# accuracy
ema = tf.train.ExponentialMovingAverage(0.999)
vars = ema.variables_to_restore()
saver = tf.train.Saver(vars)
from datasets import imagenet
with tf.Session() as sess:
saver.restore(sess, checkpoint)
x = endpoints['Predictions'].eval(feed_dict={file_input: 'imgs/dog.jpg'})
# writer = tf.summary.FileWriter("TensorBoard/", graph=sess.graph)
def extract_features(self, preprocessed_inputs):
"""Extract features from preprocessed inputs.
Args:
preprocessed_inputs: a [batch, height, width, channels] float tensor
representing a batch of images.
Returns:
feature_maps: a list of tensors where the ith tensor has shape
[batch, height_i, width_i, depth_i]
"""
preprocessed_inputs = shape_utils.check_min_image_dim(
33, preprocessed_inputs)
with tf.variable_scope('MobilenetV2',
reuse=self._reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=None, bn_decay=0.9997)), \
slim.arg_scope(
[mobilenet.depth_multiplier], min_depth=self._min_depth):
with (slim.arg_scope(self._conv_hyperparams_fn())
if self._override_base_feature_extractor_hyperparams else
context_manager.IdentityContextManager()):
_, image_features = mobilenet_v2.mobilenet_base(
ops.pad_to_multiple(preprocessed_inputs,
self._pad_to_multiple),
final_endpoint='layer_19',
depth_multiplier=self._depth_multiplier,
conv_defs=self._conv_defs,
use_explicit_padding=self._use_explicit_padding,
scope=scope)
depth_fn = lambda d: max(int(d * self._depth_multiplier), self.
_min_depth)
with slim.arg_scope(self._conv_hyperparams_fn()):
with tf.variable_scope('fpn', reuse=self._reuse_weights):
feature_blocks = [
'layer_4', 'layer_7', 'layer_14', 'layer_19'
]
base_fpn_max_level = min(self._fpn_max_level, 5)
feature_block_list = []
for level in range(self._fpn_min_level,
base_fpn_max_level + 1):
feature_block_list.append(feature_blocks[level - 2])
fpn_features = feature_map_generators.fpn_top_down_feature_maps(
[(key, image_features[key])
for key in feature_block_list],
depth=depth_fn(self._additional_layer_depth),
use_depthwise=self._use_depthwise,
use_explicit_padding=self._use_explicit_padding)
feature_maps = []
for level in range(self._fpn_min_level,
base_fpn_max_level + 1):
feature_maps.append(fpn_features['top_down_{}'.format(
feature_blocks[level - 2])])
last_feature_map = fpn_features['top_down_{}'.format(
feature_blocks[base_fpn_max_level - 2])]
# Construct coarse features
padding = 'VALID' if self._use_explicit_padding else 'SAME'
kernel_size = 3
for i in range(base_fpn_max_level + 1,
self._fpn_max_level + 1):
if self._use_depthwise:
conv_op = functools.partial(slim.separable_conv2d,
depth_multiplier=1)
else:
conv_op = slim.conv2d
if self._use_explicit_padding:
last_feature_map = ops.fixed_padding(
last_feature_map, kernel_size)
last_feature_map = conv_op(
last_feature_map,
num_outputs=depth_fn(self._additional_layer_depth),
kernel_size=[kernel_size, kernel_size],
stride=2,
padding=padding,
scope='bottom_up_Conv2d_{}'.format(
i - base_fpn_max_level + 19))
feature_maps.append(last_feature_map)
return feature_maps
def extract_features(self, preprocessed_inputs):
"""Extract features from preprocessed inputs.
Args:
preprocessed_inputs: a [batch, height, width, channels] float tensor
representing a batch of images.
Returns:
feature_maps: a list of tensors where the ith tensor has shape
[batch, height_i, width_i, depth_i]
"""
preprocessed_inputs = shape_utils.check_min_image_dim(
33, preprocessed_inputs)
with tf.variable_scope('MobilenetV2', reuse=self._reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=None, bn_decay=0.99)), \
slim.arg_scope(
[mobilenet.depth_multiplier], min_depth=self._min_depth):
with slim.arg_scope(
training_scope(l2_weight_decay=4e-5,
is_training=self._is_training)):
_, image_features = mobilenet_v2.mobilenet_base(
ops.pad_to_multiple(preprocessed_inputs, self._pad_to_multiple),
final_endpoint='layer_18',
depth_multiplier=self._depth_multiplier,
use_explicit_padding=self._use_explicit_padding,
scope=scope)
multiplier_func = functools.partial(
_apply_multiplier,
multiplier=self._depth_multiplier,
min_depth=self._min_depth)
with tf.variable_scope('MnasFPN', reuse=self._reuse_weights):
with slim.arg_scope(
training_scope(l2_weight_decay=1e-4, is_training=self._is_training)):
# Create C6 by downsampling C5.
c6 = slim.max_pool2d(
_maybe_pad(image_features['layer_18'], self._use_explicit_padding),
[3, 3],
stride=[2, 2],
padding='VALID' if self._use_explicit_padding else 'SAME',
scope='C6_downsample')
c6 = slim.conv2d(
c6,
multiplier_func(self._fpn_layer_depth),
[1, 1],
activation_fn=tf.identity,
normalizer_fn=slim.batch_norm,
weights_regularizer=None, # this 1x1 has no kernel regularizer.
padding='VALID',
scope='C6_Conv1x1')
image_features['C6'] = tf.identity(c6) # Needed for quantization.
for k in sorted(image_features.keys()):
tf.logging.error('{}: {}'.format(k, image_features[k]))
mnasfpn_inputs = [
image_features['layer_7'], # C3
image_features['layer_14'], # C4
image_features['layer_18'], # C5
image_features['C6'] # C6
]
self._verify_config(mnasfpn_inputs)
feature_maps = mnasfpn(
mnasfpn_inputs,
head_def=self._head_def,
output_channel=self._fpn_layer_depth,
use_explicit_padding=self._use_explicit_padding,
use_native_resize_op=self._use_native_resize_op,
multiplier_func=multiplier_func)
return feature_maps
def extract_features(self, preprocessed_inputs, state_saver=None,
state_name='lstm_state', unroll_length=10, scope=None):
"""Extract features from preprocessed inputs.
The features include the base network features, lstm features and SSD
features, organized in the following name scope:
<scope>/MobilenetV2_1/...
<scope>/MobilenetV2_2/...
<scope>/LSTM/...
<scope>/FeatureMap/...
Args:
preprocessed_inputs: a [batch, height, width, channels] float tensor
representing a batch of consecutive frames from video clips.
state_saver: A state saver object with methods `state` and `save_state`.
state_name: Python string, the name to use with the state_saver.
unroll_length: number of steps to unroll the lstm.
scope: Scope for the base network of the feature extractor.
Returns:
feature_maps: a list of tensors where the ith tensor has shape
[batch, height_i, width_i, depth_i]
Raises:
ValueError: if interleave_method not recognized or large and small base
network output feature maps of different sizes.
"""
preprocessed_inputs = shape_utils.check_min_image_dim(
33, preprocessed_inputs)
preprocessed_inputs = ops.pad_to_multiple(
preprocessed_inputs, self._pad_to_multiple)
batch_size = preprocessed_inputs.shape[0].value / unroll_length
batch_axis = 0
nets = []
# Batch processing of mobilenet features.
with slim.arg_scope(mobilenet_v2.training_scope(
is_training=self._is_training,
bn_decay=0.9997)), \
slim.arg_scope([mobilenet.depth_multiplier],
min_depth=self._min_depth, divisible_by=8):
# Big model.
net, _ = self.extract_base_features_large(preprocessed_inputs)
nets.append(net)
large_base_feature_shape = net.shape
# Small models
net, _ = self.extract_base_features_small(preprocessed_inputs)
nets.append(net)
small_base_feature_shape = net.shape
if not (large_base_feature_shape[1] == small_base_feature_shape[1] and
large_base_feature_shape[2] == small_base_feature_shape[2]):
raise ValueError('Large and Small base network feature map dimension '
'not equal!')
with slim.arg_scope(self._conv_hyperparams_fn()):
with tf.variable_scope('LSTM', reuse=self._reuse_weights):
output_size = (large_base_feature_shape[1], large_base_feature_shape[2])
lstm_cell, init_state, step = self.create_lstm_cell(
batch_size, output_size, state_saver, state_name)
nets_seq = [
tf.split(net, unroll_length, axis=batch_axis) for net in nets
]
net_seq, states_out = rnn_decoder.multi_input_rnn_decoder(
nets_seq,
init_state,
lstm_cell,
step,
selection_strategy=self._interleave_method,
is_training=self._is_training,
is_quantized=self._is_quantized,
pre_bottleneck=self._pre_bottleneck,
flatten_state=self._flatten_state,
scope=None)
self._states_out = states_out
batcher_ops = None
if state_saver is not None:
self._step = state_saver.state(state_name + '_step')
batcher_ops = [
state_saver.save_state(state_name + '_c', states_out[-1][0]),
state_saver.save_state(state_name + '_h', states_out[-1][1]),
state_saver.save_state(state_name + '_step', self._step + 1)]
image_features = {}
with tf_ops.control_dependencies(batcher_ops):
image_features['layer_19'] = tf.concat(net_seq, 0)
# SSD layers.
with tf.variable_scope('FeatureMap'):
feature_maps = feature_map_generators.multi_resolution_feature_maps(
feature_map_layout=self._feature_map_layout,
depth_multiplier=self._depth_multiplier,
min_depth=self._min_depth,
insert_1x1_conv=True,
image_features=image_features,
pool_residual=True)
return feature_maps.values()
def backbone_net(inputs, image_size, is_training=True, depth_multiplier=0.5):
pad_to_multiple = 14 if image_size == 112 else (10 if image_size == 80 else 8)
use_explicit_padding = False
depth_multiplier = depth_multiplier
print('construct backbone_net for image_size', image_size, 'depth_multiplier = ', depth_multiplier)
use_depthwise = True
override_base_feature_extractor_hyperparams = False
reuse_weights = None
min_depth = 16
specs = [
op(slim.conv2d, stride=2, num_outputs=64, kernel_size=[3, 3]),
# todo: Depthwise Conv3×3
op(slim.separable_conv2d, stride=1, kernel_size=[3, 3], num_outputs=None, multiplier_func=dummy_depth_multiplier),
# 562×64Bottleneck 2 64 5 2
op(ops.expanded_conv, stride=2, num_outputs=64),
]
for _ in range(0, 4):
specs.append(op(ops.expanded_conv, stride=1, num_outputs=64))
# 282×64Bottleneck212812
specs.append(op(ops.expanded_conv, stride=2, num_outputs=128))
# 142×128Bottleneck412861
for _ in range(0, 6):
specs.append(op(ops.expanded_conv,
expansion_size=expand_input(4),
num_outputs=128,
stride=1))
kernel_size = [7, 7] if image_size == 112 else ([5,5] if image_size == 80 else [4,4])
specs.append(op(ops.expanded_conv, stride=1, num_outputs=16, scope='S1'))
specs.append(op(slim.conv2d, stride=2, kernel_size=[3, 3], num_outputs=32, scope='S2'))
specs.append(op(slim.conv2d, stride=1, kernel_size=kernel_size,
num_outputs=128, scope='S3', padding='VALID'))
# print('specs = ', specs, ' len = ', len(specs))
arch = dict(
defaults={
# Note: these parameters of batch norm affect the architecture
# that's why they are here and not in training_scope.
(slim.batch_norm,): {'center': True, 'scale': True},
(slim.conv2d, slim.fully_connected, slim.separable_conv2d): {
'normalizer_fn': slim.batch_norm, 'activation_fn': tf.nn.relu6
},
(ops.expanded_conv,): {
'expansion_size': expand_input(2),
'split_expansion': 1,
'normalizer_fn': slim.batch_norm,
'residual': True,
},
(slim.conv2d, slim.separable_conv2d): {'padding': 'SAME', 'weights_initializer': slim.xavier_initializer()}
},
spec=specs
)
print('input to backbone_net ' , inputs)
with tf.variable_scope('Backbone', reuse=reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=is_training, bn_decay=0.9997)), \
slim.arg_scope(
[mobilenet.depth_multiplier], min_depth=min_depth):
with (slim.arg_scope(conv_hyperparams_fn(is_training=is_training))
if override_base_feature_extractor_hyperparams else
context_manager.IdentityContextManager()):
_, image_features = mobilenet_v2.mobilenet_base(
od_ops.pad_to_multiple(inputs, pad_to_multiple),
depth_multiplier=depth_multiplier,
is_training=is_training,
use_explicit_padding=use_explicit_padding,
conv_defs=arch,
scope=scope)
# do a fully connected layer here
# TODO
layer_15 = image_features['layer_15']
layer_16 = image_features['layer_16']
layer_17 = image_features['layer_17']
# batch_size = tf.shape(S1)[0]
S1 = slim.flatten(layer_15, scope='S1flatten') # tf.reshape(S1, [batch_size, -1])
S2 = slim.flatten(layer_16, scope='S2flatten') # [batch_size, -1])
S3 = slim.flatten(layer_17, scope='S3flatten') # [batch_size, -1])
before_dense = tf.concat([S1, S2, S3], 1)
for i in range(1, 18):
print('layer_' + str(i), image_features['layer_' + str(i)])
# print('layer_17', layer_17)
print('S1', S1)
print('S2', S2)
print('S3', S3)
# to_test = slim.conv2d(image_features['layer_19'])
print('image image_features', image_features.keys())
with slim.arg_scope([slim.batch_norm], is_training=is_training, center=True, scale=True):
return image_features, slim.fully_connected(before_dense,
136,
activation_fn=tf.nn.relu6,
normalizer_fn=slim.batch_norm,
weights_initializer=slim.xavier_initializer()), (image_features['layer_1'], inputs, image_features['layer_2'])
def extract_features(self, preprocessed_inputs):
"""Extract features from preprocessed inputs.
Args:
preprocessed_inputs: a [batch, height, width, channels] float tensor
representing a batch of images.
Returns:
feature_maps: a list of tensors where the ith tensor has shape
[batch, height_i, width_i, depth_i]
"""
preprocessed_inputs = shape_utils.check_min_image_dim(
33, preprocessed_inputs)
with tf.variable_scope('MobilenetV2', reuse=self._reuse_weights) as scope:
with slim.arg_scope(
mobilenet_v2.training_scope(is_training=None, bn_decay=0.9997)), \
slim.arg_scope(
[mobilenet.depth_multiplier], min_depth=self._min_depth):
with (slim.arg_scope(self._conv_hyperparams_fn())
if self._override_base_feature_extractor_hyperparams else
context_manager.IdentityContextManager()):
_, image_features = mobilenet_v2.mobilenet_base(
ops.pad_to_multiple(preprocessed_inputs, self._pad_to_multiple),
final_endpoint='layer_19',
depth_multiplier=self._depth_multiplier,
conv_defs=_CONV_DEFS if self._use_depthwise else None,
use_explicit_padding=self._use_explicit_padding,
scope=scope)
depth_fn = lambda d: max(int(d * self._depth_multiplier), self._min_depth)
with slim.arg_scope(self._conv_hyperparams_fn()):
with tf.variable_scope('fpn', reuse=self._reuse_weights):
feature_blocks = [
'layer_4', 'layer_7', 'layer_14', 'layer_19'
]
base_fpn_max_level = min(self._fpn_max_level, 5)
feature_block_list = []
for level in range(self._fpn_min_level, base_fpn_max_level + 1):
feature_block_list.append(feature_blocks[level - 2])
fpn_features = feature_map_generators.fpn_top_down_feature_maps(
[(key, image_features[key]) for key in feature_block_list],
depth=depth_fn(self._additional_layer_depth),
use_depthwise=self._use_depthwise)
feature_maps = []
for level in range(self._fpn_min_level, base_fpn_max_level + 1):
feature_maps.append(fpn_features['top_down_{}'.format(
feature_blocks[level - 2])])
last_feature_map = fpn_features['top_down_{}'.format(
feature_blocks[base_fpn_max_level - 2])]
# Construct coarse features
for i in range(base_fpn_max_level + 1, self._fpn_max_level + 1):
if self._use_depthwise:
conv_op = functools.partial(
slim.separable_conv2d, depth_multiplier=1)
else:
conv_op = slim.conv2d
last_feature_map = conv_op(
last_feature_map,
num_outputs=depth_fn(self._additional_layer_depth),
kernel_size=[3, 3],
stride=2,
padding='SAME',
scope='bottom_up_Conv2d_{}'.format(i - base_fpn_max_level + 19))
feature_maps.append(last_feature_map)
return feature_maps
def style_prediction_mobilenet(style_input_,
activation_names,
activation_depths,
mobilenet_end_point='layer_19',
mobilenet_trainable=True,
style_params_trainable=False,
style_prediction_bottleneck=100,
reuse=None):
"""Maps style images to the style embeddings using MobileNetV2.
Args:
style_input_: Tensor. Batch of style input images.
activation_names: string. Scope names of the activations of the transformer
network which are used to apply style normalization.
activation_depths: Shapes of the activations of the transformer network
which are used to apply style normalization.
mobilenet_end_point: string. Specifies the endpoint to construct the
MobileNetV2 network up to. This network is part of the style prediction
network.
mobilenet_trainable: bool. Should the MobileNetV2 parameters be marked
as trainable?
style_params_trainable: bool. Should the mapping from bottleneck to
beta and gamma parameters be marked as trainable?
style_prediction_bottleneck: int. Specifies the bottleneck size in the
number of parameters of the style embedding.
reuse: bool. Whether to reuse model parameters. Defaults to False.
Returns:
Tensor for the output of the style prediction network, Tensor for the
bottleneck of style parameters of the style prediction network.
"""
with tf.name_scope('style_prediction_mobilenet') and tf.variable_scope(
tf.get_variable_scope(), reuse=reuse):
with slim.arg_scope(mobilenet_v2.training_scope(
is_training=mobilenet_trainable)):
_, end_points = mobilenet.mobilenet_base(
style_input_,
conv_defs=mobilenet_v2.V2_DEF,
final_endpoint=mobilenet_end_point,
scope='MobilenetV2'
)
feat_convlayer = end_points[mobilenet_end_point]
with tf.name_scope('bottleneck'):
# (batch_size, 1, 1, depth).
bottleneck_feat = tf.reduce_mean(
feat_convlayer, axis=[1, 2], keep_dims=True)
if style_prediction_bottleneck > 0:
with tf.variable_scope('mobilenet_conv'):
with slim.arg_scope(
[slim.conv2d],
activation_fn=None,
normalizer_fn=None,
trainable=mobilenet_trainable):
# (batch_size, 1, 1, style_prediction_bottleneck).
bottleneck_feat = slim.conv2d(bottleneck_feat,
style_prediction_bottleneck, [1, 1])
style_params = {}
with tf.variable_scope('style_params'):
for i in range(len(activation_depths)):
with tf.variable_scope(activation_names[i], reuse=reuse):
with slim.arg_scope(
[slim.conv2d],
activation_fn=None,
normalizer_fn=None,
trainable=style_params_trainable):
# Computing beta parameter of the style normalization for the
# activation_names[i] layer of the style transformer network.
# (batch_size, 1, 1, activation_depths[i])
beta = slim.conv2d(bottleneck_feat, activation_depths[i], [1, 1])
# (batch_size, activation_depths[i])
beta = tf.squeeze(beta, [1, 2], name='SpatialSqueeze')
style_params['{}/beta'.format(activation_names[i])] = beta
# Computing gamma parameter of the style normalization for the
# activation_names[i] layer of the style transformer network.
# (batch_size, 1, 1, activation_depths[i])
gamma = slim.conv2d(bottleneck_feat, activation_depths[i], [1, 1])
# (batch_size, activation_depths[i])
gamma = tf.squeeze(gamma, [1, 2], name='SpatialSqueeze')
style_params['{}/gamma'.format(activation_names[i])] = gamma
return style_params, bottleneck_feat