#train checkpoint_path = './model_pth/cnn.h5' checkpoint = tf.keras.callbacks.ModelCheckpoint(checkpoint_path, monitor='val_accuracy', verbose=1,save_best_only=True, mode='max') early_stopping = tf.keras.callbacks.EarlyStopping(monitor ='val_loss', patience=200, verbose=1) optimizer = tf.keras.optimizers.Adam(learning_rate=1e-4, epsilon=1e-7)
时间: 2024-03-08 11:51:08 浏览: 20
这段代码是用 TensorFlow 2.x 版本编写的卷积神经网络模型训练代码,包括了模型的保存、早停和优化器等功能。具体的代码实现如下(Python语言):
```python
# 导入需要的库
import tensorflow as tf
from tensorflow import keras
# 定义模型
model = keras.Sequential([
keras.layers.Conv2D(32, (3,3), activation='relu', input_shape=(28,28,1)),
keras.layers.MaxPooling2D((2,2)),
keras.layers.Flatten(),
keras.layers.Dense(10, activation='softmax')
])
# 编译模型
model.compile(optimizer=tf.keras.optimizers.Adam(learning_rate=1e-4, epsilon=1e-7),
loss='categorical_crossentropy',
metrics=['accuracy'])
# 定义回调函数
checkpoint_path = './model_pth/cnn.h5'
checkpoint = tf.keras.callbacks.ModelCheckpoint(checkpoint_path, monitor='val_accuracy', verbose=1, save_best_only=True, mode='max')
early_stopping = tf.keras.callbacks.EarlyStopping(monitor='val_loss', patience=200, verbose=1)
# 训练模型
model.fit(train_images, train_labels, epochs=1000, batch_size=128,
validation_data=(test_images, test_labels),
callbacks=[checkpoint, early_stopping])
```
其中,`tf.keras.callbacks.ModelCheckpoint` 和 `tf.keras.callbacks.EarlyStopping` 分别实现了模型保存和早停的功能,`tf.keras.optimizers.Adam` 则是优化器的设置。需要注意的是,这里的模型是一个简单的卷积神经网络,输入为 28x28 的灰度图像,输出为 10 类别的概率值。