Keras-like API Python Wrapper for layers + lenet example (#2296)
Keras-like API Python Wrapper for layers + lenet example (#2296)

* python lenet

* docs

* style

* wrap getoutputshape

* update input output shape

* update

* python layers

* clean

* fix ut

* more layers

* fix ut

* more layers

* fix ut

* more layers

* wrapper

* remove

* style

* style and srelu

* style

* refine lenet

* update

* add ut for input output shape

* fix float

* refine lenet

* update

* meet review

* clean

* todo

* update

* style

* readme

* style

* style

* fix

* style

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