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https://issues.apache.org/jira/browse/SYSTEMML-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1754.
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> Performance removeEmpty w/ shallow copy if unmodified
> -----------------------------------------------------
>
>                 Key: SYSTEMML-1754
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1754
>             Project: SystemML
>          Issue Type: Task
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> Often removeEmpty is used to guard against special cases with entirely empty 
> rows or columns. In case of no removed rows or columns the full copy into the 
> output is unnecessarily inefficient. This task aims to modify removeEmpty 
> rows/cols for both dense and sparse matrices to leverage a shallow copy if 
> determined output dimensions match the input dimensions.



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