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https://issues.apache.org/jira/browse/SYSTEMML-1954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm resolved SYSTEMML-1954.
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Resolution: Done
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.0
> Allocate rexpand output in CSR instead of MCSR
> -----------------------------------------------
>
> Key: SYSTEMML-1954
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1954
> Project: SystemML
> Issue Type: Sub-task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> By default, we use the MCSR sparse format due to its flexibility on
> incremental updates. However, for permutation tables often created via
> {{rexpand}} (i.e., via table(seq,v)), we have exactly one non-zero per row
> which is the worst-case in terms of memory overhead. Since, we already have
> the abstract for different sparse representations, we should create CSR
> outputs for operations that are known to produce ultra sparse matrices.
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