如何展平嵌套模型?(keras 函数式 API) [英] How to flatten a nested model? (keras functional API)
问题描述
我已经使用 keras 模型功能 API 定义了一个简单的模型.它的一个层是一个完全顺序模型,所以我得到了一个嵌套的层结构(见下图).
I have defined a simple model using the keras Model functional API. One of its layers is a fully sequential model, so I get a nested layer structure (see images below).
如何将这种嵌套层结构转换为平面层结构?(使用脚本,而不是手动...)
How can I convert this nested layer structure into a flat layer structure? (with a script, not manually...)
我所拥有的:
_________________________________________________________________
Layer (type) Output Shape Param #
=================================================================
input_1 (InputLayer) (None, 32, 32, 1) 0
_________________________________________________________________
sequential_1 (Sequential) (None, 8, 8, 12) 720
_________________________________________________________________
flatten_1 (Flatten) (None, 768) 0
_________________________________________________________________
dense_1 (Dense) (None, 1) 769
=================================================================
我想将其转换为:
_________________________________________________________________
Layer (type) Output Shape Param #
=================================================================
input_1 (InputLayer) (None, 32, 32, 1) 0
_________________________________________________________________
conv2d_1 (Conv2D) (None, 32, 32, 6) 60
_________________________________________________________________
max_pooling2d_1 (MaxPooling2 (None, 16, 16, 6) 0
_________________________________________________________________
conv2d_2 (Conv2D) (None, 16, 16, 6) 330
_________________________________________________________________
max_pooling2d_2 (MaxPooling2 (None, 8, 8, 6) 0
_________________________________________________________________
flatten_1 (Flatten) (None, 384) 0
_________________________________________________________________
dense_1 (Dense) (None, 1) 385
=================================================================
<小时>
生成嵌套层结构的代码:
Code to generate nested layer structure:
def create_network_with_one_subnet():
# define subnetwork
subnet = keras.models.Sequential()
subnet.add(keras.layers.Conv2D(6, (3, 3), padding='same'))
subnet.add(keras.layers.MaxPool2D())
subnet.add(keras.layers.Conv2D(12, (3, 3), padding='same'))
subnet.add(keras.layers.MaxPool2D())
#subnet.summary()
# define complete network
input_shape = (32, 32, 1)
net_in = keras.layers.Input(shape=input_shape)
net_out = subnet(net_in)
net_out = keras.layers.Flatten()(net_out)
net_out = keras.layers.Dense(1)(net_out)
net_complete = keras.Model(inputs=net_in, outputs=net_out)
net_complete.compile(loss='binary_crossentropy',
optimizer=keras.optimizers.Adam(lr=0.001),
metrics=['acc'],
)
net_complete.summary()
return net_complete
推荐答案
啊,这比预期容易得多.谷歌搜索正确关键字后的解决方案:https://groups.google.com/forum/#!msg/keras-users/lJcVK25YDuc/atB6TfwqBAAJ
Ah, it was much easier than expected. Solution from here after googling the right keywords: https://groups.google.com/forum/#!msg/keras-users/lJcVK25YDuc/atB6TfwqBAAJ
def flatten_model(model_nested):
layers_flat = []
for layer in model_nested.layers:
try:
layers_flat.extend(layer.layers)
except AttributeError:
layers_flat.append(layer)
model_flat = keras.models.Sequential(layers_flat)
return model_flat
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