GitLab

* [Doc] Tree-LSTM in DGL, edit pass for readability

Edit for grammar and style. 
How about deleting the last line? "Besides, you..." It needs a transition or some context.

* Update tutorials/models/2_small_graph/3_tree-lstm.py

* Update tutorials/models/2_small_graph/3_tree-lstm.py

* minor spelling tweaks

* Update CONTRIBUTORS.md

* update version; add news.md; modify contributing.md

* change urls to dmlc

* move pytorch code to examples.

* fix.

* fix tutorial

* change Index.tolist -> Index.tonumpy; fix bug in traversal; remove dependencies in data

* fix import

* fix __all__ and some docstring

* improve capsule tutorial with jinyang

* fix wrong layout of second-level tutorial

* delete transformer

* change the signature of node/edge filter

* upd filter

* Support multi-dimension node feature in SPMV

* stable version

* hotfix

* upd tutorial

* upd README

* minor fix

* jake's change

* update tree lstm

* tree_lstm (new interface)

* simplify pop

* merge qipeng(root)

* upd tree-lstm & tutorial

* upd model

* new capsule tutorial

* capsule for new API

* fix deprecated API

* New tutorial and example

* investigate gc problem

* add viz code

* new capsule tutorial

* remove ipynb

* move u_hat

* add link

* add requirements.txt

* remove ani.save

* update ci to install requirements

* utf-8

* change seed

* graphviz requirement

* accelerate

* little format

* update some markup

[DOC][Model] Tree-LSTM example and tutorial