GitLab

* edge_softmax_hetero forwar+cpu+norm=dst

* convert eids to list

* addedunittest

* added unittest

* added backward. Not tested correctness

* minor

* changed reducer to max from sum

* bugfix

* docstring

* add GPU unittest

* output converted to dict from tuple

* lint check
Co-authored-by: Israt Nisa <nisisrat@amazon.com>
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>