GitLab

* [Sparse] Add reduction operators

* Fix linting problem

* Fix linting problem

* Fix linting problem

* Fix docstring

* Fix test cases

* Fix linting problem

* Skip reduction unittests

* [Sparse] Add Transposition

* Fix docstring

* Fix linting problem

* Minor fix

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