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* add link

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* add link

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* add gt nblink

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* update

* Add nblink

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* add diffusion notebook

* update

* polish

* [Sparse] Polish softmax.py.

* fix parameter and example
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* polish mm docstrings

* fix typo

* small fix.

* fix
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* polish

* example

* revert_example

* pylint

* revert_input

* order

* add input as parameter

* example
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* [Sparse] Polish the docstring of SparseMatrix.csr() and SparseMatrix.csc()

* Update sparse_matrix.py

* Update
Co-authored-by: Hongzhi (Steve), Chen <chenhongzhi.nkcs@gmail.com>

* polish diagonal

* polsih

* more

* more

* add paramaters-back
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

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* nbsphinx & nblink

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* update notebook

* minor update

* enable dgl sparse build in default

* disable sparse build on cugraph

* update

* 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>

* [Sparse] Use X to represent dense tensors in sddmm

* indent

* pylint: disable=invalid-name
Co-authored-by: Hongzhi (Steve), Chen <chenhongzhi.nkcs@gmail.com>

* use NotImplemented

* format

* extend to pytorch scalar

* sparse div scalar

* oops

* Apply suggestions from code review
Co-authored-by: Mufei Li <mufeili1996@gmail.com>
Co-authored-by: Mufei Li <mufeili1996@gmail.com>

* [Sparse] Refactor matmul interface.

* Update

* as_sp_to_sp

* dense

* revert_mock

* test

* revert
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* 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

* Add failing unit test

* Add fix

* Remove extra newline

* skip cpu test
Co-authored-by: Xin Yao <yaox12@outlook.com>

* [Sparse] Reduce peak memory usage of SpSpAdd

* Update

* Update

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* add mul and div

* polish

* equivalent

* indent

* double
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

* Avoid initializing CUDA at importing

* renaming

* doc

* minor

* black

* no-lint

* reorg
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>