[jira] [Resolved] (SYSTEMML-1853) StepLinreg is failing w/ recompilation issue

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

     [ https://issues.apache.org/jira/browse/SYSTEMML-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm resolved SYSTEMML-1853.
--------------------------------------
       Resolution: Fixed
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.0

> 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
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> 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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