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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>