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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/04/14 19:46:41 UTC
[jira] [Resolved] (SYSTEMML-1520) Corrupted sparse matrix
representations
[ https://issues.apache.org/jira/browse/SYSTEMML-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
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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