GitLab

* Add async transferer class

* Add async ndarray copy interface

* Add python bindings

* Fix comment

* Add python class

* Fix linting issues

* Add python unit test

* Update python interface

* move async_transferer to cuda only directory

* Fix linting issue

* Move out of contrib

* Add doc strings

* Move test compute from backend

* Update comment

* Fix test naming

* Fix argument usage

* Wrap/unwrap backend parameters

* Move to dataloading

* Move to 'dataloading'

* Make GPU/CPU compatible

* Fix unit tests

* Add docs

* Use only backend interface for datamovement in unit test

* WIP: api

* dgl.sampling, dgl.data

* dgl.sampling; dgl.dataloading

* sampling packages

* convert

* subgraph

* deprecate

* subgraph APIs

* All docstrings for convert/subgraph/transform

* almost all funcs under dgl namespace

* WIP: DGLGraph

* done graph query

* message passing functions

* lint

* fix merge error

* fix test

* lint

* fix
Co-authored-by: Quan Gan <coin2028@hotmail.com>

* [Doc] User guide section 5 and 6

* oops

* fix

* 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>