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* use NotImplemented

* format

* sparse sub

* address comments

* lint

* Update elementwise_op_diag.py

* ugh
Co-authored-by: Rhett Ying <85214957+Rhett-Ying@users.noreply.github.com>

* use NotImplemented

* format

* extend to pytorch scalar

* reformat

* reformat

* lint

* use NotImplemented

* add TypeError tests

* format

* lint

* fix type

* fix docstring

* lint

* remove redundant condition

* Update

* Update

* Update

* lint

* lint

* Update

* CI

* Update diag_matrix.py

* Update sparse_matrix.py

* Update sparse_matrix.py
Co-authored-by: Ubuntu <ubuntu@ip-172-31-36-188.ap-northeast-1.compute.internal>
Co-authored-by: Hongzhi (Steve), Chen <chenhongzhi.nkcs@gmail.com>

* update

* lint

* lint

* comments
Co-authored-by: Ubuntu <ubuntu@ip-172-31-36-188.ap-northeast-1.compute.internal>

[Sparse] Add Two Sparse Matrices with Different Sparsity, DiagMatrix.dense, Add SparseMatrix and DiagMatrix (#5044)

* Update

* undo wrong edit

* lint

* fix import

* Update
Co-authored-by: Ubuntu <ubuntu@ip-172-31-36-188.ap-northeast-1.compute.internal>

* Update

* Update

* lint

* CI

* Update
Co-authored-by: Ubuntu <ubuntu@ip-172-31-36-188.ap-northeast-1.compute.internal>

* Update

* Update

* Update

* Update

* update

* lint

* CI

* CI

* CI
Co-authored-by: Ubuntu <ubuntu@ip-172-31-36-188.ap-northeast-1.compute.internal>

Co-authored-by: Ubuntu <ubuntu@ip-172-31-36-188.ap-northeast-1.compute.internal>

* [Sparse] Add sparse matrix C++ implementation

* Add documentation

* Update

* Minor fix

* Move Python code to dgl/mock_sparse2

* Move headers to include

* lint

* Update

* Add dgl_sparse directory

* Move src code to dgl_sparse

* Add __init__.py in tests to avoid naming conflict

* Add dgl sparse so in Jenkinsfile

* Complete docstring & SparseMatrix basic op

* lint

* Disable win tests

* Add elementwise operators for diagonal matrix

* minor

* resolve ambiguity of ops

* lint check

* lint check

* lint check
Co-authored-by: Israt Nisa <nisisrat@amazon.com>