inception_v4.py 文件源码

def block_reduction_b(input):
    if K.image_data_format() == 'channels_first':
        channel_axis = 1
    else:
        channel_axis = -1

    branch_0 = conv2d_bn(input, 192, 1, 1)
    branch_0 = conv2d_bn(branch_0, 192, 3, 3, strides=(2, 2), padding='valid')

    branch_1 = conv2d_bn(input, 256, 1, 1)
    branch_1 = conv2d_bn(branch_1, 256, 1, 7)
    branch_1 = conv2d_bn(branch_1, 320, 7, 1)
    branch_1 = conv2d_bn(branch_1, 320, 3, 3, strides=(2,2), padding='valid')

    branch_2 = MaxPooling2D((3, 3), strides=(2, 2), padding='valid')(input)

    x = concatenate([branch_0, branch_1, branch_2], axis=channel_axis)
    return x