[jira] [Assigned] (SYSTEMML-2130) Primitives to check the validity of sparse block representations

["Janardhan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SYSTEMML-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Janardhan reassigned SYSTEMML-2130:
-----------------------------------

    Assignee: Janardhan

> Primitives to check the validity of sparse block representations
> ----------------------------------------------------------------
>
>                 Key: SYSTEMML-2130
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2130
>             Project: SystemML
>          Issue Type: Task
>            Reporter: Matthias Boehm
>            Assignee: Janardhan
>            Priority: Major
>
> This task aims to improve the debugging of our existing sparse block representations (MCSR, CSR, COO). We already have internal primitives such as {{ProgramBlock.checkSparsity}} and {{MatrixBlock.checkSparseRows}}, which are by default disabled but enabled on demand for debugging purposes.
> In detail, it would be useful to extend the {{SparseBlock}} abstraction by a method {{checkValidity(int rlen, int clen, boolean strict)}} in order to validate the correctness of the internal data structures of the different sparse block implementations. For example, for CSR this would entail checks for (1) correct meta data, (2) correct array lengths, (3) non-decreasing row pointers, (4) sorted column indexes per row, (5) non-existing zero values, and (6) a capacity that is no larger than nnz times resize factor.    



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