使用Inception-v4 搭建图像识别模型代码

Inception-v4 是 Google 在 2016 年提出的一种深度卷积神经网络模型，是 Inception 系列模型的最新版本，其网络结构更深，性能更优。下面是使用 TensorFlow 搭建 Inception-v4 图像识别模型的示例代码：

import tensorflow as tf
import numpy as np

def conv2d(inputs, filters, kernel_size, strides=1, padding='same', activation=tf.nn.relu, name=None):
    '''
    定义卷积层函数
    inputs: 输入张量
    filters: 卷积核个数
    kernel_size: 卷积核大小
    strides: 步长
    padding: 边界填充方式
    activation: 激活函数
    name: 层的名称
    '''
    return tf.layers.conv2d(inputs=inputs, filters=filters, kernel_size=kernel_size, strides=strides,
                            padding=padding, activation=activation, name=name)

def inception_v4(inputs, num_classes, is_training=True):
    '''
    定义 Inception-v4 模型
    inputs: 输入张量
    num_classes: 分类数
    is_training: 是否训练
    '''
    # Stem
    net = conv2d(inputs, 32, 3, strides=2, padding='valid', name='Conv2d_1a_3x3')
    net = conv2d(net, 32, 3, padding='valid', name='Conv2d_2a_3x3')
    net = conv2d(net, 64, 3, name='Conv2d_2b_3x3')
    net = tf.layers.max_pooling2d(net, pool_size=3, strides=2, padding='valid', name='MaxPool_3a_3x3')
    net = conv2d(net, 80, 1, padding='valid', name='Conv2d_3b_1x1')
    net = conv2d(net, 192, 3, padding='valid', name='Conv2d_4a_3x3')
    net = tf.layers.max_pooling2d(net, pool_size=3, strides=2, padding='valid', name='MaxPool_5a_3x3')

    # Inception-A
    net = inception_a(net, 96, name='Mixed_5b')
    net = inception_a(net, 96, name='Mixed_5c')
    net = inception_a(net, 96, name='Mixed_5d')

    # Reduction-A
    net = reduction_a(net, name="Mixed_6a")

    # Inception-B
    net = inception_b(net, 128, name='Mixed_6b')
    net = inception_b(net, 160, name='Mixed_6c')
    net = inception_b(net, 160, name='Mixed_6d')
    net = inception_b(net, 192, name='Mixed_6e')

    # Reduction-B
    net = reduction_b(net, name="Mixed_7a")

    # Inception-C
    net = inception_c(net, 192, name='Mixed_7b')
    net = inception_c(net, 224, name='Mixed_7c')

    # Average Pooling
    net = tf.layers.average_pooling2d(net, pool_size=8, strides=1, padding='valid', name='AvgPool_1a_8x8')

    # Dropout
    net = tf.layers.dropout(net, rate=0.2, training=is_training, name='Dropout_1b')

    # Flatten
    net = tf.layers.flatten(net, name='Flatten_1c')

    # Output
    logits = tf.layers.dense(net, num_classes, name='Logits')

    return logits

def inception_a(inputs, filters, name=None):
    '''
    定义 Inception-A 模块
    inputs: 输入张量
    filters: 卷积核个数
    name: 模块名称
    '''
    with tf.variable_scope(name):
        with tf.variable_scope('Branch_0'):
            branch_0 = conv2d(inputs, filters, 1, name='Conv2d_0a_1x1')

        with tf.variable_scope('Branch_1'):
            branch_1 = conv2d(inputs, filters, 1, name='Conv2d_1a_1x1')
            branch_1 = conv2d(branch_1, filters, 3, name='Conv2d_1b_3x3')

        with tf.variable_scope('Branch_2'):
            branch_2 = conv2d(inputs, filters, 1, name='Conv2d_2a_1x1')
            branch_2 = conv2d(branch_2, filters, 3, name='Conv2d_2b_3x3')
            branch_2 = conv2d(branch_2, filters, 3, name='Conv2d_2c_3x3')

        with tf.variable_scope('Branch_3'):
            branch_3 = tf.layers.average_pooling2d(inputs, pool_size=3, strides=1, padding='same', name='AvgPool_3a_3x3')
            branch_3 = conv2d(branch_3, filters, 1, name='Conv2d_3b_1x1')

        output = tf.concat([branch_0, branch_1, branch_2, branch_3], axis=-1, name='Concatenate')

        return output

def reduction_a(inputs, name=None):
    '''
    定义 Reduction-A 模块
    inputs: 输入张量
    name: 模块名称
    '''
    with tf.variable_scope(name):
        with tf.variable_scope('Branch_0'):
            branch_0 = conv2d(inputs, 384, 3, strides=2, padding='valid', name='Conv2d_0a_3x3')

        with tf.variable_scope('Branch_1'):
            branch_1 = conv2d(inputs, 192, 1, name='Conv2d_1a_1x1')
            branch_1 = conv2d(branch_1, 224, 3, name='Conv2d_1b_3x3')
            branch_1 = conv2d(branch_1, 256, 3, strides=2, padding='valid', name='Conv2d_1c_3x3')

        with tf.variable_scope('Branch_2'):
            branch_2 = tf.layers.max_pooling2d(inputs, pool_size=3, strides=2, padding='valid', name='MaxPool_2a_3x3')

        output = tf.concat([branch_0, branch_1, branch_2], axis=-1, name='Concatenate')

        return output

def inception_b(inputs, filters, name=None):
    '''
    定义 Inception-B 模块
    inputs: 输入张量
    filters: 卷积核个数
    name: 模块名称
    '''
    with tf.variable_scope(name):
        with tf.variable_scope('Branch_0'):
            branch_0 = conv2d(inputs, filters, 1, name='Conv2d_0a_1x1')

        with tf.variable_scope('Branch_1'):
            branch_1 = conv2d(inputs, filters, 1, name='Conv2d_1a_1x1')
            branch_1 = conv2d(branch_1, filters, [1, 7], name='Conv2d_1b_1x7')
            branch_1 = conv2d(branch_1, filters, [7, 1], name='Conv2d_1c_7x1')

        with tf.variable_scope('Branch_2'):
            branch_2 = conv2d(inputs, filters, 1, name='Conv2d_2a_1x1')
            branch_2 = conv2d(branch_2, filters, [7, 1], name='Conv2d_2b_7x1')
            branch_2 = conv2d(branch_2, filters, [1, 7], name='Conv2d_2c_1x7')
            branch_2 = conv2d(branch_2, filters, [7, 1], name='Conv2d_2d_7x1')
            branch_2 = conv2d(branch_2, filters, [1, 7], name='Conv2d_2e_1x7')

        with tf.variable_scope('Branch_3'):
            branch_3 = tf.layers.average_pooling2d(inputs, pool_size=3, strides=1, padding='same', name='AvgPool_3a_3x3')
            branch_3 = conv2d(branch_3, filters, 1, name='Conv2d_3b_1x1')

        output = tf.concat([branch_0, branch_1, branch_2, branch_3], axis=-1, name='Concatenate')

        return output

def reduction_b(inputs, name=None):
    '''
    定义 Reduction-B 模块
    inputs: 输入张量
    name: 模块名称
    '''
    with tf.variable_scope(name):
        with tf.variable_scope('Branch_0'):
            branch_0 = conv2d(inputs, 192, 1, name='Conv2d_0a_1x1')
            branch_0 = conv2d(branch_0, 192, 3, strides=2, padding='valid', name='Conv2d_0b_3x3')

        with tf.variable_scope('Branch_1'):
            branch_1 = conv2d(inputs, 256, 1, name='Conv2d_1a_1x1')
            branch_1 = conv2d(branch_1, 256, [1, 7], name='Conv2d_1b_1x7')
            branch_1 = conv2d(branch_1, 320, [7, 1], name='Conv2d_1c_7x1')
            branch_1 = conv2d(branch_1, 320, 3, strides=2, padding='valid', name='Conv2d_1d_3x3')

        with tf.variable_scope('Branch_2'):
            branch_2 = tf.layers.max_pooling2d(inputs, pool_size=3, strides=2, padding='valid', name='MaxPool_2a_3x3')

        output = tf.concat([branch_0, branch_1, branch_2], axis=-1, name='Concatenate')

        return output

以上就是使用 TensorFlow 搭建 Inception-v4 图像识别模型的示例代码，其中包含了模型的定义以及各个模块的实现。你可以根据自己的需求进行修改和优化。