我想做的事情:我想在cifar10数据集上训练卷积神经网络,只有两个类。然后,一旦获得适合的模型,我便希望获取所有图层并复制输入图像。所以我想从网络取回图像而不是分类。
到目前为止,我所做的是:
def copy_freeze_model(model, nlayers = 1):
new_model = Sequential()
for l in model.layers[:nlayers]:
l.trainable = False
new_model.add(l)
return new_model
numClasses = 2
(X_train, Y_train, X_test, Y_test) = load_data(numClasses)
#Part 1
rms = RMSprop()
model = Sequential()
#input shape: channels, rows, columns
model.add(Convolution2D(32, 3, 3, border_mode='same',
input_shape=(3, 32, 32)))
model.add(Activation("relu"))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Dropout(0.5))
model.add(Flatten())
model.add(Dense(512))
model.add(Activation("relu"))
model.add(Dropout(0.5))
#output layer
model.add(Dense(numClasses))
model.add(Activation('softmax'))
model.compile(loss='categorical_crossentropy', optimizer=rms,metrics=["accuracy"])
model.fit(X_train,Y_train, batch_size=32, nb_epoch=25,
verbose=1, validation_split=0.2,
callbacks=[EarlyStopping(monitor='val_loss', patience=2)])
print('Classifcation rate %02.3f' % model.evaluate(X_test, Y_test)[1])
##pull the layers and try to get an output from the network that is image.
newModel = copy_freeze_model(model, nlayers = 8)
newModel.add(Dense(1024))
newModel.compile(loss='mean_squared_error', optimizer=rms,metrics=["accuracy"])
newModel.fit(X_train,X_train, batch_size=32, nb_epoch=25,
verbose=1, validation_split=0.2,
callbacks=[EarlyStopping(monitor='val_loss', patience=2)])
preds = newModel.predict(X_test)
另外,当我这样做时:
input_shape=(3, 32, 32)
这是否意味着3通道(RGB)32 x 32图像?
我建议您使用堆叠式卷积自动编码器。这使得解卷层和去卷积成为必需。在这里,您可以找到Theano(构建Keras的地方)的一般思想和代码:
https://swarbrickjones.wordpress.com/2015/04/29/convolutional-autoencoders-in-pythontheanolasagne/
所需层的示例定义可以在以下位置找到:
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我来说两句