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resNet.py
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resNet.py
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import tensorflow as tf
import os
import numpy as np
from matplotlib import pyplot as plt
from tensorflow.keras import Model
from tensorflow import keras
from tensorflow.keras.layers import Conv2D,BatchNormalization,Activation,MaxPool2D,Dropout,Flatten,Dense,GlobalAveragePooling2D
np.set_printoptions(threshold=np.inf)
#########载入数据集
train =np.load('F:/re_train-data/train_data.npy',allow_pickle=True)
simple =np.load('F:/re_train-data/target.npy',allow_pickle=True)
x_train =train[:-5000]
y_train=simple[:-5000]
x_test =train[-5000:]
y_test=simple[-5000:]
x_train,x_test =x_train/255.0,x_test/255.0 #归一化
###建立inceptionnet网络
class ResnetBlock(Model):
def __init__(self, filters, strides=1, residual_path=False):
super(ResnetBlock, self).__init__()
self.filters = filters
self.strides = strides
self.residual_path = residual_path
self.c1 = Conv2D(filters, (3, 3), strides=strides, padding='same', use_bias=False)
self.b1 = BatchNormalization()
self.a1 = Activation('relu')
self.c2 = Conv2D(filters, (3, 3), strides=1, padding='same', use_bias=False)
self.b2 = BatchNormalization()
# residual_path为True时，对输入进行下采样，即用1x1的卷积核做卷积操作，保证x能和F(x)维度相同，顺利相加
if residual_path:
self.down_c1 = Conv2D(filters, (1, 1), strides=strides, padding='same', use_bias=False)
self.down_b1 = BatchNormalization()
self.a2 = Activation('relu')
def call(self, inputs):
residual = inputs # residual等于输入值本身，即residual=x
# 将输入通过卷积、BN层、激活层，计算F(x)
x = self.c1(inputs)
x = self.b1(x)
x = self.a1(x)
x = self.c2(x)
y = self.b2(x)
if self.residual_path:
residual = self.down_c1(inputs)
residual = self.down_b1(residual)
out = self.a2(y + residual) # 最后输出的是两部分的和，即F(x)+x或F(x)+Wx,再过激活函数
return out
class ResNet18(Model):
def __init__(self, block_list, initial_filters=64): # block_list表示每个block有几个卷积层
super(ResNet18, self).__init__()
self.num_blocks = len(block_list) # 共有几个block
self.block_list = block_list
self.out_filters = initial_filters
self.c1 = Conv2D(self.out_filters, (3, 3), strides=1, padding='same', use_bias=False)
self.b1 = BatchNormalization()
self.a1 = Activation('relu')
self.blocks = tf.keras.models.Sequential()
# 构建ResNet网络结构
for block_id in range(len(block_list)): # 第几个resnet block
for layer_id in range(block_list[block_id]): # 第几个卷积层
if block_id != 0 and layer_id == 0: # 对除第一个block以外的每个block的输入进行下采样
block = ResnetBlock(self.out_filters, strides=2, residual_path=True)
else:
block = ResnetBlock(self.out_filters, residual_path=False)
self.blocks.add(block) # 将构建好的block加入resnet
self.out_filters *= 2 # 下一个block的卷积核数是上一个block的2倍
self.p1 = tf.keras.layers.GlobalAveragePooling2D()
self.f1 = tf.keras.layers.Dense(10, activation='softmax', kernel_regularizer=tf.keras.regularizers.l2())
def call(self, inputs):
x = self.c1(inputs)
x = self.b1(x)
x = self.a1(x)
x = self.blocks(x)
x = self.p1(x)
y = self.f1(x)
return y
model = ResNet18([2, 2, 2, 2])
model.compile(optimizer='adam',#使用adam优化器
loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=False),#使用SparseCategoricalCrossentropy损失函数
metrics=['sparse_categorical_accuracy'])#准确率
#加入回调函数
checkpoint_savepath = './checkpoint/resNet_GTA5_01.ckpt'
if os.path.exists(checkpoint_savepath + '.index'):
print('______启用已经训练的模型______')
model.load_weights(checkpoint_savepath)#加载已经训练的模型
#设置回调函数参数
cp_callback =tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_savepath,save_weights_only=True,save_best_only=True)
history =model.fit(x_train,y_train,batch_size=128,epochs=5,validation_data=(x_test,y_test),validation_freq=1,callbacks=[cp_callback])
model.summary()
#保存训练数据
file =open('./inception_GTA5_weight.txt','w')
for v in model.trainable_variables:
file.write(str(v.name)+'\n')
file.write(str(v.shape)+'\n')
file.write(str(v.numpy()) + '\n')
file.close()
#使用MAT显示图表
acc = history.history['sparse_categorical_accuracy']
val_acc = history.history['val_sparse_categorical_accuracy']
loss = history.history['loss']
val_loss = history.history['val_loss']
plt.subplot(1, 2, 1)
plt.plot(acc, label='Training Accuracy')
plt.plot(val_acc, label='Validation Accuracy')
plt.title('Training and Validation Accuracy')
plt.legend()
plt.subplot(1, 2, 2)
plt.plot(loss, label='Training Loss')
plt.plot(val_loss, label='Validation Loss')
plt.title('Training and Validation Loss')
plt.legend()
plt.show()