Matthias Boehm commented on SYSTEMML-2130:

[~return_01] this might be a good task to get started with the interface and 
internals of our sparse block formats.

> 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
>            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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