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From "Matthias Boehm (JIRA)" <>
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
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm

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


Caused by: java.lang.NullPointerException
        at org.apache.sysml.lops.BinaryScalar.getOpcode(
        at org.apache.sysml.lops.BinaryScalar.getInstructions(
        at org.apache.sysml.lops.compile.Dag.generateControlProgramJobs(
        at org.apache.sysml.lops.compile.Dag.doGreedyGrouping(
        at org.apache.sysml.lops.compile.Dag.getJobs(
        at org.apache.sysml.hops.recompile.Recompiler.recompileHopsDag(
        at org.apache.sysml.runtime.controlprogram.ProgramBlock.execute(

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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