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* Matrix union

* Pass test

* Fix lint

* return map for unionCOO/unionCSR

* Revert "return map for unionCOO/unionCSR"

This reverts commit 28e96c40f0659f02b33d88bcf528af6a6267726d.

* Update

* lint

* lint

* Fix doc
Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-214.ec2.internal>

* Matrix to simple

* Pass test

* new impl

* Fix test

* Fix lint

* trigger

* upd

* Fix comments
Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-214.ec2.internal>

* add nonzero op

* 111

* fix doc
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>

* Use omp flush

* test

* test

* remove omp
Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-214.ec2.internal>
Co-authored-by: Jinjing Zhou <VoVAllen@users.noreply.github.com>

* add cub; array cumsum

* CSRSliceRows

* fix warning

* operator << for ndarray; CSRSliceRows

* add CSRIsSorted

* add csr_sort

* inplace coosort and outplace csrsort

* WIP: coo is sorted

* mv cuda_utils

* add AllTrue utility

* csr sort

* coo sort

* coo2csr for sorted coo arrays

* CSRToCOO from sorted

* pass tests for the new kernel changes

* cannot use inplace sort

* lint

* try fix msvc error

* Fix g.copy_to and g.asnumbits; ToBlock no longer uses CSC

* stash

* revert some hack

* revert some changes

* address comments

* fix

* fix to_block unittest

* add todo note

* fix debug compilation

* fix

* revert

* udp

* simplify

* sddmm dot cpu

* upd

* format

* upd

* compatible with MJ's PR

* lint

* upd

* upd

* upd

* python end

* upd

* upd

* lint

* lint

* upd

* upd

* upd

* upd

* upd

* lint

* fix mxnet

* upd

* lint

* use minjie's ptr

* macro

* upd

* reorg

* lint

* fix corner cases

* upd

* enrich cpu docs

* upd

* upd

* lint

* lint

* pylint

* sx review

* improve docstring

* python doc

* upd

* restructure

* lint

* upd test

* upd

* pylint

* fix corner cases and test

Co-authored-by: Da Zheng <zhengda1936@gmail.com>

* add cuda utils; change g.to; add g.device

* split array.h into several headers

* cuda index select

* file

* three cuda kernels

* add cuda elementwise arith and several others

* cuda CSRIsNonZero

* fix lint

* lint

* lint

* fix bug in changing ctx to property

* address comments

* remove unused codes

* address comments

* traversal to new framework

* add new

* Fix compile

* Pass test

* keep old version

* lint

* lint

* Fix

* Fix

* Fix compatability with new master

* Fix test and tutorials

* Update according to comments

* Fix test
Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-214.ec2.internal>

* add reorder immutable graph.

* add python API.

* add reorder for csr.

* remove gk version.

* fix

* add cpp test.

* bug fixes

* fix tests.

* fix bugs and add check

* fix test.

* add omp.

* add comments.

* add coo reorder.

* fix a bug.

* handle reorder for different graph structues.

* fix lint.

* fix.

* add original ids.

* reshuffle nodes before metis partition.

* inner nodes are in contiguous Id range.

* reshuffle nodes/edges when partitioning.

* load partition return graph partition book.

* use inner_node/inner_edges

* add and test range partition book.

* count inner_edge correctly.

* fix lint.

* fix lint.

* fix lint.

* fix errors.

* fix errors.

* fix for TF.

* fix.

* fix.

* change docstring.

* support logical and.

* add comments.

* avoid copy.

* fix

* update docstring.

* fix a bug.

* add range search.

* fix

* fix a bug.

* add more tests.

* load graph partition book.

* support shared memory for range partition book.

* fix a bug.

* fix.

* fix lint.

* remove check

* fix test.

* remove num_nodes and num_edges

* fix lint.

* fix graph partition book.

* address comments.

* use makedirs.

* fix compile
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>
Co-authored-by: Chao Ma <mctt90@gmail.com>

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

* unsupervised graphsage first commit

* fix

* disable remove_edges and still got 0.90 performance

* optimize edgeids with multimap

* change hyperparams

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

* improve speed

* fix bugs

* upd reg test

* Fix coo_sort

* Add COOSort test

* Fix

* omp

* coo2csr can benefit from sorted coo

* Add more test code

* Add LIBCXX_ENABLE_PARALLEL_ALGORITHMS to Makefile

* upd

* Turn off LIBCXX_ENABLE_PARALLEL_ALGORITHMS by default
Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-214.ec2.internal>

* compact

* prealloc memory for hashtable

* Fix

* upd

* Reduce memory

* upd
Co-authored-by: Ubuntu <ubuntu@ip-172-31-51-214.ec2.internal>

* remove edge and to bipartite and graphsage with sampling

* fixes

* fixes

* fixes

* reenable multigpu training

* fixes

* compatibility in DGLGraph

* rename to compact_as_bipartite

* bugfix

* lint

* add offline inference

* skip GPU tests

* fix

* addresses comments

* fix

* fix

* fix

* more tests

* more docs and unit tests

* workaround for empty slice on empty data

* 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

* [WIP] PinSAGE operators

* moved the edge remapping mess into C

* some docstrings

* lint

* lint x2

* lint x3

* skip gpu test on topk

* extend pinsage to any metapath

* lint x4

* addresses #1265

* add always_preserve (fixes #1266) and fix a silly bug

* disable gpu test on compaction

* lint

* fix a horrible bug and add more tests

* lint

* addresses comments

* lint

* bugfix

* addresses comments
Co-authored-by: Minjie Wang <minjie.wang@nyu.edu>

* WIP: working on random choices

* light slice

* basic CPU impl

* add python binding; fix CreateFromCOO and CreateFromCSR returning unitgraph

* simple test case works

* fix bug in slicing probability array

* fix bug in getting the correct relation graph

* fix bug in creating placeholder graph

* enable omp

* add cpp test

* sample topk

* add in|out_subgraph

* try fix lint; passed all unittests

* fix lint

* fix msvc compile; add sorted flag and constructors

* fix msvc

* coosort

* COOSort; CSRRowWiseSampling; CSRRowWiseTopk

* WIP: remove DType in CSR and COO; Restrict data array to be IdArray

* fix all CSR ops for missing data array

* compiled

* passed tests

* lint

* test sampling out edge

* test different per-relation fanout/k values

* fix bug in random choice

* finished cpptest

* fix compile

* Add induced edges

* add check

* fixed bug in sampling on hypersparse graph; add tests

* add ascending flag

* in|out_subgraph returns subgraph and induced eid

* address comments

* lint

* fix

* unit graph that prefers coo queries

* auto detect coo preference

* forgot some functions

* disable lint on detect_prefer_coo

* reorg

* change comment

* lint

* fix

* move array_utils.h to src

* compact graph impl

* fix redundant copying in idhashmap

* docstring

* moving preference detection to C

* lint

* fix unit test & address comments

* hypersparse autorestrict

* docstring & fix

* revert copyto and asnumbits

* fix stupid bug

* lint

* leave a TODO for sorted COO

* fixing same node type mapping to different id in different graphs

* addresses comments

* made induced nodes a feautre column

* lint?

* trying to refactor IndexSelect

* partial implementation

* add index select and assign for floats as well

* move to random choice source

* more updates

* fixes

* fixes

* more fixes

* adding python impl

* fixes

* unit test

* lint

* lint x2

* lint x3

* update metapath2vec

* debugging performance

* still debugging for performance

* tuning

* switching to succvec

* redo

* revert non-uniform sampler to use vector

* still not fast

* why does this crash with OpenMP???

* because there was a data race!!!

* add documentations and remove assign op

* lint

* lint x2

* lol what have i done

* lint x3

* fix and disable gpu testing

* bugfix

* generic random walk

* reorg the random walk source code

* Update randomwalks.h

* Update randomwalks_cpu.cc

* rename file

* move internal function to anonymous ns

* reorg & docstrings

* constant restart probability

* docstring fix

* more commit

* random walk with restart, tested

* some fixes

* switch to using NDArray for choice

* massive fix & docstring

* lint x?

* lint x??

* fix

* export symbols

* skip gpu test

* addresses comments

* replaces another VecToIdArray

* add randomwalks.h to include

* replace void * with template

* sort

* sort in parallel.

* fix a bug in sorting adj

* rename.

* add more comments.

* accelerate GetData

* fix tests.

* avoid sorting multiple times.

* add test.

* change back.

* sort.

* add sort_csr.

* Fix a bug.

* fix.

* revert modifcation.

* rename

* speed up EdgeIds.

* WIP: array refactoring

* WIP: implementation

* wip

* most csr part

* WIP: on coo

* WIP: coo

* finish refactoring immutable graph

* compiled

* fix undefined ndarray copy bug; add COOToCSR when coo has no data array

* fix bug in COOToCSR

* fix bug in CSR constructor

* fix bug in in_edges(vid)

* fix OutEdges bug

* pass test_graph

* pass test_graph

* fix bug in CSR constructor

* fix bug in CSR constructor

* fix bug in CSR constructor

* fix stupid bug

* pass gpu test

* remove debug printout

* fix lint

* rm biparate grpah

* fix lint

* address comments

* fix bug in Clone

* cpp utests