前文

• 一、Windows系统下安装Tensorflow2.x（2.6）
• 二、深度学习-读取数据
• 三、Tensorflow图像处理预算
• 四、线性回归模型的tensorflow实现
• 五、深度学习-逻辑回归模型
• 六、AlexNet实现中文字体识别——隶书和行楷
• 七、VGG16实现鸟类数据库分类

加利福尼亚理工学院鸟类数据库分类VGG16+BN版本

数据生成器

from keras.preprocessing.image import ImageDataGenerator

IMSIZE = 224
train_generator = ImageDataGenerator(rescale=1. / 255).flow_from_directory('../../data/data_vgg/train',
                                                                           target_size=(IMSIZE, IMSIZE),
                                                                           batch_size=20,
                                                                           class_mode='categorical'
                                                                           )

validation_generator = ImageDataGenerator(rescale=1. / 255).flow_from_directory('../../data/data_vgg/test',
                                                                                target_size=(IMSIZE, IMSIZE),
                                                                                batch_size=20,
                                                                                class_mode='categorical'
                                                                                )
                                                                           )

图像显示

from matplotlib import pyplot as plt

plt.figure()
fig, ax = plt.subplots(2, 5)
fig.set_figheight(6)
fig.set_figwidth(15)
ax = ax.flatten()
X, Y = next(validation_generator)
for i in range(15): ax[i].imshow(X[i, :, :, ])

VGG16+BN模型构建

#VGG16+BN实现
#VGG16+BN模型构建
from keras.layers import Conv2D, BatchNormalization, MaxPooling2D
from keras.layers import Flatten, Dense, Input, Activation
from keras import Model
from keras.layers import GlobalAveragePooling2D

input_shape = (IMSIZE, IMSIZE, 3)
input_layer = Input(input_shape)
x = input_layer

x = BatchNormalization(axis=3)(x)
x = Conv2D(64, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(64, [3, 3], padding="same", activation='relu')(x)
x = MaxPooling2D((2, 2))(x)

x = BatchNormalization(axis=3)(x)
x = Conv2D(128, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(128, [3, 3], padding="same", activation='relu')(x)
x = MaxPooling2D((2, 2))(x)

x = BatchNormalization(axis=3)(x)
x = Conv2D(256, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(256, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(256, [3, 3], padding="same", activation='relu')(x)
x = MaxPooling2D((2, 2))(x)

x = BatchNormalization(axis=3)(x)
x = Conv2D(512, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(512, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(512, [3, 3], padding="same", activation='relu')(x)
x = MaxPooling2D((2, 2))(x)

x = BatchNormalization(axis=3)(x)
x = Conv2D(512, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(512, [3, 3], padding="same", activation='relu')(x)
x = BatchNormalization(axis=3)(x)
x = Conv2D(512, [3, 3], padding="same", activation='relu')(x)
x = MaxPooling2D((2, 2))(x)

x = GlobalAveragePooling2D()(x)

x = Dense(315)(x)
x = Activation('softmax')(x)
output_layer = x
model_vgg16_b = Model(input_layer, output_layer)
model_vgg16_b.summary()

VGG16+BN模型编译与拟合

from keras.optimizers import Adam

model_vgg16.compile(loss='categorical_crossentropy',
                    optimizer=Adam(lr=0.001),
                    metrics=['accuracy'])
model_vgg16.fit_generator(train_generator,
                          epochs=20,
                          validation_data=validation_generator)

注意：

因为自己是使用tensorflow-GPU版本，自己电脑是1050Ti，4G显存。实际运行时候batch_size设置不到15大小，太大了就显存资源不足。

但是batch_size太小，总的数据集较大较多，所以最后消耗时间就较长。

所以为了效率和烧显卡，请酌情考虑

数据集来源：kaggle平台315种鸟类：315 Bird Species - Classification | Kaggle

GitHub下载地址：

Tensorflow1.15深度学习