* remove print

* add support for `validate['save_img']`

* `get_start.md` is linked to English doc

* remove spaces in empty line

* add edvr model

* modifying code formats and comments

* modifying code formats and comments

* modifying code formats and comments

* add notes
Co-authored-by: NLielinJiang <50691816+LielinJiang@users.noreply.github.com>