* new hetero RGCN
* bgs running
* fix gpu
* am dataset
* fix bug in label preparation
* Fix AM training; add result
* rm sym link
* new embed layer; mutag
* mutag matched; other fix
* minor fix
* dataset refactor
* new data loading
* rm old files
* refactor
* docstring
* include literal nodes in AIFB dataset
* address comments
* docstring
* rgcn tutorial
* data processing for rgcn
* many fix
* requirements for rgcn tutorial
* fix comments
* description of rgcn dataset
* author
* bug fix
* move all dataset to s3