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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SYSTEMML-1853) StepLinreg is failing w/ recompilation issue
Date Sat, 02 Sep 2017 23:38:00 GMT

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

Matthias Boehm closed SYSTEMML-1853.
------------------------------------

> 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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