Fix a spelling error in the "5.2 Cutmix" document.
`rom ppcls.data.imaug import DecodeImage` to `from ppcls.data.imaug import DecodeImage`

add faq

* Add RepVGG models

* Update model code

* Rename code

* format code

* add README of RepVGG

* add faq

* add pngs

* fix mainpage

* fix faq

* update configs of ViT and DeiT

* update readme of DeiT models

* update readme of DeiT models

* update readme of DeiT models

* update README of ViT models

* Update the discription about ViT and DeiT

* Fix the error file

* Unified data format

* fix save distillation model

* add note

* Add the DeiT models

* fix a training bug

* update the model init config

* update the License

* Add the ViT model

* fix vgg stop grad

* beautify code