GitLab

* go through gcn, relgcn

* fix tagconv formula

* fix doc in sageconv

* fix sgconv doc

* replace hat with tilde

* more comments on gmmconv

* fix agnnconv chebconv doc

* modify nnconv doc

* remove &

* add nn conv examples

* Rebase master

* More merge conflicts

* check homo

* add back self loop for some convs, check homo in tranform

* add example for denseconv

* add example and doc for dotgat and cfconv

* check in-degree for graphconv

* add language fix

* gconv address all comments

* another round of change based on api template

* change agnn

* go through agnn, appnp, atomic, cf, cheb, dense, gat, sage modules

* finish pytorch part of nn conv

* mxnet graphconv done

* tensorflow graphconv works

* add new modules into doc

* add comments to not split code

* refine doc

* resr

* more comments

* more fix

* finish conv and dense conv part api

* pylint fix

* fix pylink

* fix pylint

* more fix

* fix

* fix test fail because zere in degree

* fix test fail

* sage is not update for mxnet tf
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