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* upd

* simplify

* further simplify

* lint

* doc

* upd

* upd

* upd

* upd

* upd

* upd

* upd

* lint

* rename format

* upd

* lint

* upd

* upd

* upd

* udp

* debug

* upd

* upd

* upd

* upd

* upd

* 无可厚非吧

* 中三边肥

* 你一定要喊吗

* lint

* upd

* upd

* upd

* upd

* upd

* upd

* upd

* Update unit_graph.h
Co-authored-by: Zihao Ye <yzh119@192.168.0.110>
Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>

* 111

* 111

* lint

* lint

* lint

* lint

* fix

* lint

* try

* fix

* lint

* lint

* test

* fix

* ttt

* test

* fix

* fix

* fix

* mxnet

* 111

* fix 64bits computation

* pylint

* roll back

* fix

* lint

* fix hetero_from_relations

* remove index_dtype in to_homo and to_hetero

* fix

* fix

* fix

* fix

* remove default

* fix

* lint

* fix

* fix error message

* fix error

* lint

* macro dispatch

* try

* lint

* remove nbits

* error message

* fix

* fix

* lint

* lint

* lint

* fix

* lint

* fix

* fix random walk

* lint

* lint

* fix

* fix

* fix

* lint

* fix

* lint
Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>

* [Feature] Casting between DGLGraph and DGLHeteroGraph

* lint

* address comments
Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>
Co-authored-by: Jinjing Zhou <VoVAllen@users.noreply.github.com>

* add num nodes in ctors

* fix

* lint

* addresses comments

* replace with constexpr

* remove function with rvalue reference

* address comments

* improve performance of sample_neighbors

* some more improve

* test script

* benchmarks

* multi process

* update more tests

* WIP

* adding two API for state saving

* add create from state

* upd test

* missing file

* wip: pickle/unpickle

* more c apis

* find the problem of empty data array

* add null array; pickling speed is bad

* still bad perf

* still bad perf

* wip

* fix the pickle speed test; now everything looks good

* minor fix

* bugfix

* some lint fix

* address comments

* more fix

* fix lint

* add utest for random.choice

* add utest for dgl.rand_graph

* fix cpp utests

* try fix ci

* fix bug in TF backend

* upd choice docstring

* address comments

* upd

* try fix compile

* add comment