能否输出网络的结构？
Created by: yeyupiaoling
在V2版本还可以每个网络来的大小，但是在Fluid版本好像不可以。 Fluid可以这样输出网络的类似结构吗？
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Layer (type) Output Shape Param #
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conv2d_13 (Conv2D) (None, 32, 32, 32) 896
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activation_19 (Activation) (None, 32, 32, 32) 0
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batch_normalization_13 (Batc (None, 32, 32, 32) 128
_________________________________________________________________
conv2d_14 (Conv2D) (None, 32, 30, 30) 9248
_________________________________________________________________
activation_20 (Activation) (None, 32, 30, 30) 0
_________________________________________________________________
batch_normalization_14 (Batc (None, 32, 30, 30) 120
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