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https://issues.apache.org/jira/browse/SYSTEMML-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Janardhan closed SYSTEMML-2130.
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Resolution: Fixed
Fix Version/s: SystemML 1.1
> 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
> Fix For: SystemML 1.1
>
>
> 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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