[jira] [Created] (SYSTEMML-1520) Corrupted sparse matrix representations

["Matthias Boehm (JIRA)" <ji...@apache.org>]

Matthias Boehm created SYSTEMML-1520:
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             Summary: Corrupted sparse matrix representations
                 Key: SYSTEMML-1520
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1520
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


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}



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