13.1 image augmentation (#770)
13.1 image augmentation (#770)

* image augmentation initial

* image augmentation initial

* img aug adapt latest change

* adopt changes
mli/gluon-tutorials-zh,d2l-ai/d2l-zh,d2l-ai/d2l-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,d2l-ai/d2l-zh,mli/gluon-tutorials-zh