* fix some bugs

* update configs

* add lesrcnn model

* add esrgan model, refine codes

* Integrate with visualdl
* visualdl: add doc and control paramter
* visual dl: move import, add install doc

* add ugatit model

* refine codes docs

* fix pix2pix to_tensor

* fix apps

* update demo

* refine code

* test

* fix apps

* update readme

* rm unused code

* fix apps output when input is image

* clean code

* update requirements.txt