Mobile-Net v1 tensorflow 源码解读

Mobile-Net v1 tensorflow 源码解读

标签（空格分隔）： tensorflow 源码

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Mobile-Net v1是Xecption结构的一个应用，其目的是将深度网络应用在移动端上

"""
该代码主要关注的是mobilenet_v1_base、mobilenet_v1
"""
# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# =============================================================================
"""MobileNet v1.

MobileNet is a general architecture and can be used for multiple use cases.
Depending on the use case, it can use different input layer size and different
head (for example: embeddings, localization and classification).

As described in https://arxiv.org/abs/1704.04861.

  MobileNets: Efficient Convolutional Neural Networks for
    Mobile Vision Applications
  Andrew G. Howard, Menglong Zhu, Bo Chen, Dmitry Kalenichenko, Weijun Wang,
    Tobias Weyand, Marco Andreetto, Hartwig Adam

100% Mobilenet V1 (base) with input size 224x224:

See mobilenet_v1()

Layer                                                     params           macs
--------------------------------------------------------------------------------
MobilenetV1/Conv2d_0/Conv2D:                                 864      10,838,016
MobilenetV1/Conv2d_1_depthwise/depthwise:                    288       3,612,672
MobilenetV1/Conv2d_1_pointwise/Conv2D:                     2,048      25,690,112
MobilenetV1/Conv2d_2_depthwise/depthwise:                    576       1,806,336
MobilenetV1/Conv2d_2_pointwise/Conv2D:                     8,192      25,690,112
MobilenetV1/Conv2d_3_depthwise/depthwise:                  1,152       3,612,672
MobilenetV1/Conv2d_3_pointwise/Conv2D:                    16,384      51,380,224
MobilenetV1/Conv2d_4_depthwise/depthwise:                  1,152         903,168
MobilenetV1/Conv2d_4_pointwise/Conv2D:                    32,768      25,690,112
MobilenetV1/Conv2d_5_depthwise/depthwise:                  2,304       1,806,336
MobilenetV1/Conv2d_5_pointwise/Conv2D:                    65,536      51,380,224
MobilenetV1/Conv2d_6_depthwise/depthwise:                  2,304         451,584
MobilenetV1/Conv2d_6_pointwise/Conv2D:                   131,072      25,690,112
MobilenetV1/Conv2d_7_depthwise/depthwise:                  4,608         903,168
MobilenetV1/Conv2d_7_pointwise/Conv2D:                   262,144      51,380,224
MobilenetV1/Conv2d_8_depthwise/depthwise:                  4,608         903,168
MobilenetV1/Conv2d_8_pointwise/Conv2D:                   262,144      51,380,224
MobilenetV1/Conv2d_9_depthwise/depthwise:                  4,608         903,168
MobilenetV1/Conv2d_9_pointwise/Conv2D:                   262,144      51,380,224
MobilenetV1/Conv2d_10_depthwise/depthwise:                 4,608         903,168
MobilenetV1/Conv2d_10_pointwise/Conv2D:                  262,144      51,380,224
MobilenetV1/Conv2d_11_depthwise/depthwise:                 4,608         903,168
MobilenetV1/Conv2d_11_pointwise/Conv2D:                  262,144      51,380,224
MobilenetV1/Conv2d_12_depthwise/depthwise:                 4,608         225,792
MobilenetV1/Conv2d_12_pointwise/Conv2D:                  524,288      25,690,112
MobilenetV1/Conv2d_13_depthwise/depthwise:                 9,216         451,584
MobilenetV1/Conv2d_13_pointwise/Conv2D:                1,048,576      51,380,224
--------------------------------------------------------------------------------
Total:                                                 3,185,088     567,716,352


75% Mobilenet V1 (base) with input size 128x128:

See mobilenet_v1_075()

Layer                                                     params           macs
--------------------------------------------------------------------------------
MobilenetV1/Conv2d_0/Conv2D:                                 648       2,654,208
MobilenetV1/Conv2d_1_depthwise/depthwise:                    216         884,736
MobilenetV1/Conv2d_1_pointwise/Conv2D:                     1,152       4,718,592
MobilenetV1/Conv2d_2_depthwise/depthwise:                    432         442,368
MobilenetV1/Conv2d_2_pointwise/Conv2D:                     4,608       4,718,592
MobilenetV1/Conv2d_3_depthwise/depthwise:                    864         884,736
MobilenetV1/Conv2d_3_pointwise/Conv2D:                     9,216       9,437,184
MobilenetV1/Conv2d_4_depthwise/depthwise:                    864         221,184
MobilenetV1/Conv2d_4_pointwise/Conv2D:                    18,432       4,718,592
MobilenetV1/Conv2d_5_depthwise/depthwise:                  1,728         442,368
MobilenetV1/Conv2d_5_pointwise/Conv2D:                    36,864       9,437,184
MobilenetV1/Conv2d_6_depthwise/depthwise:                  1,728         110,592
MobilenetV1/Conv2d_6_pointwise/Conv2D:                    73,728       4,718,592
MobilenetV1/Conv2d_7_depthwise/depthwise:                  3,456         221,184
MobilenetV1/Conv2d_7_pointwise/Conv2D:                   147,456       9,437,184
MobilenetV1/Conv2d_8_depthwise/depthwise:                  3,456         221,184
MobilenetV1/Conv2d_8_pointwise/Conv2D:                   147,456       9,437,184
MobilenetV1/Conv2d_9_depthwise/depthwise:                  3,456         221,184
MobilenetV1/Conv2d_9_pointwise/Conv2D:                   147,456       9,437,184
MobilenetV1/Conv2d_10_depthwise/depthwise:                 3,456         221,184
MobilenetV1/Conv2d_10_pointwise/Conv2D:                  147,456       9,437,184
MobilenetV1/Conv2d_11_depthwise/depthwise:                 3,456         221,184
MobilenetV1/Conv2d_11_pointwise/Conv2D:                  147,456       9,437,184
MobilenetV1/Conv2d_12_depthwise/depthwise:                 3,456          55,296
MobilenetV1/Conv2d_12_pointwise/Conv2D:                  294,912       4,718,592
MobilenetV1/Conv2d_13_depthwise/depthwise:                 6,912         110,592
MobilenetV1/Conv2d_13_pointwise/Conv2D:                  589,824       9,437,184
--------------------------------------------------------------------------------
Total:                                                 1,800,144     106,002,432

"""

# Tensorflow mandates these.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

from collections import namedtuple
import functools

import tensorflow as tf

slim = tf.contrib.slim

# Conv and DepthSepConv namedtuple define layers of the MobileNet architecture
# Conv defines 3x3 convolution layers
# DepthSepConv defines 3x3 depthwise convolution followed by 1x1 convolution.
# stride is the stride of the convolution
# depth is the number of channels or filters in a layer
Conv = namedtuple('Conv', ['kernel', 'stride', 'depth'])
DepthSepConv = namedtuple('DepthSepConv', ['kernel', 'stride', 'depth'])

# _CONV_DEFS specifies the MobileNet body
# _CONV_DEFS预定义了Mobile-Net的核心，当然也可以根据自己需求设计网络
_CONV_DEFS = [
    Conv(kernel=[3, 3], stride=2, depth=32),
    DepthSepConv(kernel=[3, 3], stride=1, depth=64),
    DepthSepConv(kernel=[3, 3], stride=2, depth=128),
    DepthSepConv(kernel=[3, 3], stride=1, depth=128),
    DepthSepConv(kernel=[3, 3], stride=2, depth=256),
    DepthSepConv(kernel=[3, 3], stride=1, depth=256),
    DepthSepConv(kernel=[3, 3], stride=2, depth=512),
    DepthSepConv(kernel=[3, 3], stride=1, depth=512),
    DepthSepConv(kernel=[3, 3], stride=1, depth=512),
    DepthSepConv(kernel=[3, 3], stride=1, depth=512),
    DepthSepConv(kernel=[3, 3], stride=1, depth=512),
    DepthSepConv(kernel=[3, 3], stride=1, depth=512),
    DepthSepConv(kernel=[3, 3], stride=2, depth=1024),
    DepthSepConv(kernel=[3, 3], stride=1, depth=1024)
]


def _fixed_padding(inputs, kernel_size, rate=1):
  """Pads the input along the spatial dimensions independently of input size.

  Pads the input such that if it was used in a convolution with 'VALID' padding,
  the output would have the same dimensions as if the unpadded input was used
  in a convolution with 'SAME' padding.

  Args:
    inputs: A tensor of size [batch, height_in, width_in, channels].
    kernel_size: The kernel to be used in the conv2d or max_pool2d operation.
    rate: An integer, rate for atrous convolution.

  Returns:
    output: A tensor of size [batch, height_out, width_out, channels] with the
      input, either intact (if kernel_size == 1) or padded (if kernel_size > 1).
  """
  kernel_size_effective = [kernel_size[0] + (kernel_size[0] - 1) * (rate - 1),
                           kernel_size[0] + (kernel_size[0] - 1) * (rate - 1)]
  pad_total = [kernel_size_effective[0] - 1, kernel_size_effective[1] - 1]
  pad_beg = [pad_total[0] // 2, pad_total[1] // 2]
  pad_end = [pad_total[0] - pad_beg[0], pad_total[1] - pad_beg[1]]
  padded_inputs = tf.pad(inputs, [[0, 0], [pad_beg[0], pad_end[0]],
                                  [pad_beg[1], pad_end[1]], [0, 0]])
  return padded_inputs

#该函数将用户定义的conv_defs或者_CONV_DEFS展开，建立图模型
def mobilenet_v1_base(inputs,
                      final_endpoint='Conv2d_13_pointwise',
                      min_depth=8,
                      depth_multiplier=1.0,
                      conv_defs=None,
                      output_stride=None,
                      use_explicit_padding=False,
                      scope=None):
  """Mobilenet v1.

  关键参数说明：
  final_endpoint: 指定函数最后的输出；
  其他的基本上和mobilenet_v1一样

  Constructs a Mobilenet v1 network from inputs to the given final endpoint.

  Args:
    inputs: a tensor of shape [batch_size, height, width, channels].
    final_endpoint: specifies the endpoint to construct the network up to. It
      can be one of ['Conv2d_0', 'Conv2d_1_pointwise', 'Conv2d_2_pointwise',
      'Conv2d_3_pointwise', 'Conv2d_4_pointwise', 'Conv2d_5'_pointwise,
      'Conv2d_6_pointwise', 'Conv2d_7_pointwise', 'Conv2d_8_pointwise',
      'Conv2d_9_pointwise', 'Conv2d_10_pointwise', 'Conv2d_11_pointwise',
      'Conv2d_12_pointwise', 'Conv2d_13_pointwise'].
    min_depth: Minimum depth value (number of channels) for all convolution ops.
      Enforced when depth_multiplier < 1, and not an active constraint when
      depth_multiplier >= 1.
    depth_multiplier: Float multiplier for the depth (number of channels)
      for all convolution ops. The value must be greater than zero. Typical
      usage will be to set this value in (0, 1) to reduce the number of
      parameters or computation cost of the model.
    conv_defs: A list of ConvDef namedtuples specifying the net architecture.
    output_stride: An integer that specifies the requested ratio of input to
      output spatial resolution. If not None, then we invoke atrous convolution
      if necessary to prevent the network from reducing the spatial resolution
      of the activation maps. Allowed values are 8 (accurate fully convolutional
      mode), 16 (fast fully convolutional mode), 32 (classification mode).
    use_explicit_padding: Use 'VALID' padding for convolutions, but prepad
      inputs so that the output dimensions are the same as if 'SAME' padding
      were used.
    scope: Optional variable_scope.

  Returns:
    tensor_out: output tensor corresponding to the final_endpoint.
    end_points: a set of activations for external use, for example summaries or
                losses.

  Raises:
    ValueError: if final_endpoint is not set to one of the predefined values,
                or depth_multiplier <= 0, or the target output_stride is not
                allowed.
  """
  # 指定“瘦身”后的卷积通道数
  depth = lambda d: max(int(d * depth_multiplier), min_depth)
  end_points = {}

  # Used to find thinned depths for each layer.
  if depth_multiplier <= 0:
    raise ValueError('depth_multiplier is not greater than zero.')

  # 如果用户未定义，则用官方指定的结构
  if conv_defs is None:
    conv_defs = _CONV_DEFS

  if output_stride is not None and output_stride not in [8, 16, 32]:
    raise ValueError('Only allowed output_stride values are 8, 16, 32.')

  padding = 'SAME'
  if use_explicit_padding:
    padding = 'VALID'
  with tf.variable_scope(scope, 'MobilenetV1', [inputs]):
    with slim.arg_scope([slim.conv2d, slim.separable_conv2d], padding=padding):
      # The current_stride variable keeps track of the output stride of the
      # activations, i.e., the running product of convolution strides up to the
      # current network layer. This allows us to invoke atrous convolution
      # whenever applying the next convolution would result in the activations
      # having output stride larger than the target output_stride.
      current_stride = 1

      # The atrous convolution rate parameter.
      rate = 1 # 空洞卷积的采样率

      net = inputs
      for i, conv_def in enumerate(conv_defs): #循环，展开网络的配置
        end_point_base = 'Conv2d_%d' % i
        """
        如果当前stride已经满足用户指定的输出stride 则后面的stride强制为1
        但是rate=rate*stride保证感受野；
        如果没有满足输出stride, stride和网络配置一样，但是layer_rate=1
        """
        if output_stride is not None and current_stride == output_stride:
          # If we have reached the target output_stride, then we need to employ
          # atrous convolution with stride=1 and multiply the atrous rate by the
          # current unit's stride for use in subsequent layers.
          layer_stride = 1
          layer_rate = rate
          rate *= conv_def.stride
        else:
          layer_stride = conv_def.stride
          layer_rate = 1
          current_stride *= conv_def.stride

        if isinstance(conv_def, Conv):
          end_point = end_point_base
          if use_explicit_padding:
            net = _fixed_padding(net, conv_def.kernel)
          net = slim.conv2d(net, depth(conv_def.depth), conv_def.kernel,
                            stride=conv_def.stride,
                            normalizer_fn=slim.batch_norm,
                            scope=end_point)
          end_points[end_point] = net
          if end_point == final_endpoint:
            return net, end_points

        elif isinstance(conv_def, DepthSepConv):# 通道分离卷积
          end_point = end_point_base + '_depthwise'

          # By passing filters=None
          # separable_conv2d produces only a depthwise convolution layer
          if use_explicit_padding:
            net = _fixed_padding(net, conv_def.kernel, layer_rate)
          net = slim.separable_conv2d(net, None, conv_def.kernel,
                                      depth_multiplier=1,
                                      stride=layer_stride,
                                      rate=layer_rate,
                                      normalizer_fn=slim.batch_norm,
                                      scope=end_point)

          end_points[end_point] = net
          if end_point == final_endpoint:
            return net, end_points

          end_point = end_point_base + '_pointwise'
          # 空间分离卷积
          net = slim.conv2d(net, depth(conv_def.depth), [1, 1],
                            stride=1,
                            normalizer_fn=slim.batch_norm,
                            scope=end_point)

          end_points[end_point] = net
          if end_point == final_endpoint:
            return net, end_points
        else:
          raise ValueError('Unknown convolution type %s for layer %d'
                           % (conv_def.ltype, i))
  raise ValueError('Unknown final endpoint %s' % final_endpoint)

#用户直接调用的函数
"""
关键参数说明：
min_depth: 一个卷积层中最少有多少个通道数
depth_multiplier: 在Mobile-Net v1中，作者提到给网络进行“瘦身“
conv_defs: 用户可以按照_CONV_DEFS的形式自定义网络
"""
def mobilenet_v1(inputs,
                 num_classes=1000,
                 dropout_keep_prob=0.999,
                 is_training=True,
                 min_depth=8,
                 depth_multiplier=1.0,
                 conv_defs=None,
                 prediction_fn=tf.contrib.layers.softmax,
                 spatial_squeeze=True,
                 reuse=None,
                 scope='MobilenetV1',
                 global_pool=False):
  """Mobilenet v1 model for classification.

  Args:
    inputs: a tensor of shape [batch_size, height, width, channels].
    num_classes: number of predicted classes. If 0 or None, the logits layer
      is omitted and the input features to the logits layer (before dropout)
      are returned instead.
    dropout_keep_prob: the percentage of activation values that are retained.
    is_training: whether is training or not.
    min_depth: Minimum depth value (number of channels) for all convolution ops.
      Enforced when depth_multiplier < 1, and not an active constraint when
      depth_multiplier >= 1.
    depth_multiplier: Float multiplier for the depth (number of channels)
      for all convolution ops. The value must be greater than zero. Typical
      usage will be to set this value in (0, 1) to reduce the number of
      parameters or computation cost of the model.
    conv_defs: A list of ConvDef namedtuples specifying the net architecture.
    prediction_fn: a function to get predictions out of logits.
    spatial_squeeze: if True, logits is of shape is [B, C], if false logits is
        of shape [B, 1, 1, C], where B is batch_size and C is number of classes.
    reuse: whether or not the network and its variables should be reused. To be
      able to reuse 'scope' must be given.
    scope: Optional variable_scope.
    global_pool: Optional boolean flag to control the avgpooling before the
      logits layer. If false or unset, pooling is done with a fixed window
      that reduces default-sized inputs to 1x1, while larger inputs lead to
      larger outputs. If true, any input size is pooled down to 1x1.

  Returns:
    net: a 2D Tensor with the logits (pre-softmax activations) if num_classes
      is a non-zero integer, or the non-dropped-out input to the logits layer
      if num_classes is 0 or None.
    end_points: a dictionary from components of the network to the corresponding
      activation.

  Raises:
    ValueError: Input rank is invalid.
  """
  input_shape = inputs.get_shape().as_list()
  if len(input_shape) != 4:
    raise ValueError('Invalid input tensor rank, expected 4, was: %d' %
                     len(input_shape))

  with tf.variable_scope(scope, 'MobilenetV1', [inputs], reuse=reuse) as scope:
    with slim.arg_scope([slim.batch_norm, slim.dropout],
                        is_training=is_training):
    # mobilenet_v1_base将conv_defs网络配置展开
      net, end_points = mobilenet_v1_base(inputs, scope=scope,
                                          min_depth=min_depth,
                                          depth_multiplier=depth_multiplier,
                                          conv_defs=conv_defs)
      with tf.variable_scope('Logits'):#如果采用Logits表示网络的任务进行分类
        if global_pool:
          # Global average pooling.
          net = tf.reduce_mean(net, [1, 2], keep_dims=True, name='global_pool')
          end_points['global_pool'] = net# 此时网络输出b,1,1,1024
        else:
          # Pooling with a fixed kernel size.
          kernel_size = _reduced_kernel_size_for_small_input(net, [7, 7])
          net = slim.avg_pool2d(net, kernel_size, padding='VALID',
                                scope='AvgPool_1a')
          end_points['AvgPool_1a'] = net
        if not num_classes:
          return net, end_points
        # 1 x 1 x 1024
        net = slim.dropout(net, keep_prob=dropout_keep_prob, scope='Dropout_1b')
        logits = slim.conv2d(net, num_classes, [1, 1], activation_fn=None,
                             normalizer_fn=None, scope='Conv2d_1c_1x1')
        if spatial_squeeze: # 压缩第2，3维度为1，此时网络输出为 b,num_classes
          logits = tf.squeeze(logits, [1, 2], name='SpatialSqueeze')
      end_points['Logits'] = logits
      if prediction_fn:
        end_points['Predictions'] = prediction_fn(logits, scope='Predictions')
  return logits, end_points

mobilenet_v1.default_image_size = 224


def wrapped_partial(func, *args, **kwargs):
  partial_func = functools.partial(func, *args, **kwargs)
  functools.update_wrapper(partial_func, func)
  return partial_func


mobilenet_v1_075 = wrapped_partial(mobilenet_v1, depth_multiplier=0.75)
mobilenet_v1_050 = wrapped_partial(mobilenet_v1, depth_multiplier=0.50)
mobilenet_v1_025 = wrapped_partial(mobilenet_v1, depth_multiplier=0.25)


def _reduced_kernel_size_for_small_input(input_tensor, kernel_size):
  """Define kernel size which is automatically reduced for small input.

  If the shape of the input images is unknown at graph construction time this
  function assumes that the input images are large enough.

  Args:
    input_tensor: input tensor of size [batch_size, height, width, channels].
    kernel_size: desired kernel size of length 2: [kernel_height, kernel_width]

  Returns:
    a tensor with the kernel size.
  """
  shape = input_tensor.get_shape().as_list()
  if shape[1] is None or shape[2] is None:
    kernel_size_out = kernel_size
  else:
    kernel_size_out = [min(shape[1], kernel_size[0]),
                       min(shape[2], kernel_size[1])]
  return kernel_size_out


def mobilenet_v1_arg_scope(is_training=True,
                           weight_decay=0.00004,
                           stddev=0.09,
                           regularize_depthwise=False):
  """Defines the default MobilenetV1 arg scope.

  Args:
    is_training: Whether or not we're training the model.
    weight_decay: The weight decay to use for regularizing the model.
    stddev: The standard deviation of the trunctated normal weight initializer.
    regularize_depthwise: Whether or not apply regularization on depthwise.

  Returns:
    An `arg_scope` to use for the mobilenet v1 model.
  """
  batch_norm_params = {
      'is_training': is_training,
      'center': True,
      'scale': True,
      'decay': 0.9997,
      'epsilon': 0.001,
  }

  # Set weight_decay for weights in Conv and DepthSepConv layers.
  weights_init = tf.truncated_normal_initializer(stddev=stddev)
  regularizer = tf.contrib.layers.l2_regularizer(weight_decay)
  if regularize_depthwise:
    depthwise_regularizer = regularizer
  else:
    depthwise_regularizer = None
  with slim.arg_scope([slim.conv2d, slim.separable_conv2d],
                      weights_initializer=weights_init,
                      activation_fn=tf.nn.relu6, normalizer_fn=slim.batch_norm):
    with slim.arg_scope([slim.batch_norm], **batch_norm_params):
      with slim.arg_scope([slim.conv2d], weights_regularizer=regularizer):
        with slim.arg_scope([slim.separable_conv2d],
                            weights_regularizer=depthwise_regularizer) as sc:
          return sc