GitLab

* [Example ]add mvgrl

* [Doc] add mvgrl to readme

* add more comments

* fix typos

* replace tab with space

* [doc] replace tab with space

* [Doc] fix a typo

* fix minor typos

* fix typos

* fix typos

* fix typos

* fix typos

* fix
Co-authored-by: Mufei Li <mufeili1996@gmail.com>