GitLab

* [Model] MixHop for Node Classification task

* [docs] update

* [docs] update

* [fix] remove seed option

* [fix] update readme

* [feature] support qm9 dataset

* [style] update

* [docs] fix the details

* [fix] indexing only support int

* [style] update

* [fix] multiple backends support

* [docs] add qm9

* [fix] Z type: float32 -> int32

* [fix] Z type: int32 -> long

* [docs] add ref

* [docs] fix

* [docs] update

* [docs] update

* [fix] test eval

* [docs] fix example
Co-authored-by: xnuohz@126.com <ubuntu@ip-172-31-44-184.us-east-2.compute.internal>
Co-authored-by: Mufei Li <mufeili1996@gmail.com>
Co-authored-by: Jinjing Zhou <VoVAllen@users.noreply.github.com>