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https://issues.apache.org/jira/browse/SYSTEMML-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm resolved SYSTEMML-1520.
--------------------------------------
Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.0
> Corrupted sparse matrix representations
> ---------------------------------------
>
> Key: SYSTEMML-1520
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1520
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Priority: Blocker
> Fix For: SystemML 1.0
>
>
> Apparently, there are operations that corrupt the internal sparse matrix
> representations in terms of (1) unsorted column indexes, and (2) duplicated
> column indexes, which can lead to incorrect results, and errors due to
> incorrect meta data (e.g., nnz) as well as index of bounds exceptions. The
> most recent - fortunately, perfectly reproducible - issues showed up as
> follows:
> {code}
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 41
> at
> org.apache.sysml.runtime.matrix.data.SparseRow.append(SparseRow.java:215)
> at
> org.apache.sysml.runtime.matrix.data.SparseBlockMCSR.append(SparseBlockMCSR.java:253)
> at
> org.apache.sysml.runtime.matrix.data.MatrixBlock.appendValue(MatrixBlock.java:663)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixBincell.appendRightForSparseBinary(LibMatrixBincell.java:1256)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixBincell.mergeForSparseBinary(LibMatrixBincell.java:1238)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixBincell.safeBinary(LibMatrixBincell.java:269)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixBincell.bincellOp(LibMatrixBincell.java:120)
> at
> org.apache.sysml.runtime.matrix.data.MatrixBlock.binaryOperations(MatrixBlock.java:2840)
> at
> org.apache.sysml.runtime.instructions.cp.MatrixMatrixArithmeticCPInstruction.processInstruction(MatrixMatrixArithmeticCPInstruction.java:51)
> at
> org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:288)
> {code}
> The above issues was triggered due to the following combination of column
> index arrays for a binary operations:
> {code}
> cols1: [30, 38, 33, 34, 1, 8, 13, 14, 15, 16, 7, 37, 6, 5, 23, 4, 29]
> cols2: [13, 14, 15, 16, 18, 20, 21, 23, 24, 26, 28, 29, 30, 32, 33, 34, 35,
> 36, 37, 38, 40, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 0, 0]
> {code}
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