GitLab

* update knn graph docs

* more docs

* [Doc] transform module docstrings

* remove copy_ndata and copy_edata

* fix

* lint

* fix

* fix

* fix

* clean up docstrings

* fix docstring

* dtype specifications

* addresses comments

* fix
Co-authored-by: Mufei Li <mufeili1996@gmail.com>
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>