GitLab

* fix bug after moving batcher out of dgl.data

* disable mx utest

* add more unit tests for mxnet.

* fix.

* explain the batch dimension.

* update doc.

* disable unit tests on DFS.

* fix graph traversal.

* add more unit tests for mxnet.

* fix.

* add examples in traversal.py

* message propagate methods

* use the new message propagation for tree-lstm

* update to the new name

* update propagate API doc

* update doc

* add propagate utest