Co-authored-by: Ubuntu <ubuntu@ip-172-31-28-63.ap-northeast-1.compute.internal>
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>
* NGNN for ogbl * modify doc organization. * merge similar parts * 1st approving review. * minor changes * Remove the "Usage" section. Co-authored-by: Mufei Li <mufeili1996@gmail.com>