我为一个图像分类问题创建了这个模型。我遇到的问题是验证准确率总是比训练准确率低 5-8%,且验证损失远高于训练损失。以下是一个 epoch 的示例: 损失率: 0.2232,准确率: 0.9245,验证损失率: 0.4131,验证准确率: 0.8700
model = Sequential()
model.add(Conv2D(32, 3, 3, border_mode='same', input_shape=(150,
150, 3), activation='relu'))
model.add(Conv2D(32, 3, 3, border_mode='same', activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Conv2D(64, 3, 3, border_mode='same', activation='relu'))
model.add(Conv2D(64, 3, 3, border_mode='same', activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Conv2D(128, 3, 3, border_mode='same',
activation='relu'))
model.add(Conv2D(128, 3, 3, border_mode='same',
activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Conv2D(256, 3, 3, border_mode='same',
activation='relu'))
model.add(Conv2D(256, 3, 3, border_mode='same',
activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Flatten())
model.add(Dense(256, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(256, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(1))
model.add(Activation('sigmoid'))
model.compile(loss='binary_crossentropy',
optimizer=RMSprop(lr=0.0001),
metrics=['accuracy'])
# this is the augmentation configuration we will use for training
train_datagen = ImageDataGenerator(
rescale=1. / 255,
shear_range=0.1,
zoom_range=0.1,
horizontal_flip=True)
# this is the augmentation configuration we will use for testing:
# only rescaling
test_datagen = ImageDataGenerator(rescale=1. / 255)
我尝试使用Hyperas进行贝叶斯超参数优化,但它推荐的模型超参数并没有真正适合我。我应该如何更改我的模型以防止过拟合?由于将来用于实际情况的数据不多,我没有使用太多数据来训练和验证模型。非常感谢您的任何建议。