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https://issues.apache.org/jira/browse/SYSTEMML-2036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-2036.
------------------------------------
Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.0
> RemoveEmpty with selection vector updates nnz incorrectly
> ---------------------------------------------------------
>
> Key: SYSTEMML-2036
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2036
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> Detailed sparsity checks revealed an issue with removeEmpty and selection
> vectors, where not all rows with non zeros are selected. Since we only copy
> the nnz from the input, the output meta data is wrong which can lead to
> incorrect sparse/dense representations and in the worst-case incorrect
> results (e.g., for sum(X!=0)).
> {code}
> Caused by: org.apache.sysml.runtime.DMLRuntimeException: Matrix nnz meta data
> was incorrect: (_mVar7023, actual=4515, expected=4514,
> inst=CP°rmempty°margin=rows°select=_mVar7022°target=_mVar7009°bRmEmptyBC=false°_mVar7023·MATRIX·DOUBLE)
> at
> org.apache.sysml.runtime.controlprogram.ProgramBlock.checkSparsity(ProgramBlock.java:384)
> at
> org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:297)
> ... 10 more
> {code}
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