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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1853) StepLinreg is failing w/ recompilation issue
Date Fri, 18 Aug 2017 06:14:00 GMT
Matthias Boehm created SYSTEMML-1853:
----------------------------------------

             Summary: StepLinreg is failing w/ recompilation issue
                 Key: SYSTEMML-1853
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1853
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


Our step-wise LinregDS is currently failing with the following NPE on dynamic recompilation

{code}

Caused by: java.lang.NullPointerException
        at org.apache.sysml.lops.BinaryScalar.getOpcode(BinaryScalar.java:111)
        at org.apache.sysml.lops.BinaryScalar.getInstructions(BinaryScalar.java:87)
        at org.apache.sysml.lops.compile.Dag.generateControlProgramJobs(Dag.java:1406)
        at org.apache.sysml.lops.compile.Dag.doGreedyGrouping(Dag.java:1176)
        at org.apache.sysml.lops.compile.Dag.getJobs(Dag.java:270)
        at org.apache.sysml.hops.recompile.Recompiler.recompileHopsDag(Recompiler.java:239)
        at org.apache.sysml.runtime.controlprogram.ProgramBlock.execute(ProgramBlock.java:147)
{code}

The root cause is that some rewrite modified the input solve to a scalar, which causes the
instruction generation of solve to fail because it is not defined over scalars.



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