Memory optimization in ZeroPadding, Cropping layer.

[Alan-Turing-Ko]

Hi majianjia.
With your kind support of ZeroPadding layer, I deployed my caffe model successfully.
Now I am trying to deploy my model on memory constraint chip, and I found ZeroPadding layer consume much memory.

#3 Conv2D - ReLU - ( 64, 64, 8) 819k (17,424,32,768, 100) 1 1 1 - - - - -
#4 ZeroPad - - ( 65, 65, 8) (32,768,33,800, 0) 1 - 1 - - - - -

I think ZeroPadding and Cropping can be replaced as Single Buffer layer, not sure though.
I expect a quick response as before.
Thanks again for your great work.

[majianjia]

Hi @Alan-Turing-Ko,
Thanks for your suggestion, the current method is to keep them simple and efficient.
I think it is possible to make them single buffer layers.
Cropping is straight forward, but zero padding need to be done in reverse order.
I am planning to do it in the following days.
If you cant wait, you can also make your version and pull request are always welcome.
Jianjia