[SYSTEMDS-1755] Failed instruction generation during dynamic recompilation

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemML 0.15
• Assignee: Matthias Boehm
• Reporter: Matthias Boehm
• Created: 09/Jul/17 06:47
• Updated: 09/Sep/17 02:11
• Resolved: 14/Jul/17 19:56

Description

Caused by: org.apache.sysml.runtime.DMLRuntimeException: Unable to recompile program block.
        at org.apache.sysml.runtime.controlprogram.ProgramBlock.execute(ProgramBlock.java:159)
        at org.apache.sysml.runtime.controlprogram.FunctionProgramBlock.execute(FunctionProgramBlock.java:115)
        ... 13 more
Caused by: java.lang.NullPointerException
        at org.apache.sysml.lops.BinaryScalar.getOpcode(BinaryScalar.java:119)
        at org.apache.sysml.lops.BinaryScalar.getInstructions(BinaryScalar.java:84)
        at org.apache.sysml.lops.compile.Dag.generateControlProgramJobs(Dag.java:1405)
        at org.apache.sysml.lops.compile.Dag.doGreedyGrouping(Dag.java:1175)
        at org.apache.sysml.lops.compile.Dag.getJobs(Dag.java:269)
        at org.apache.sysml.hops.recompile.Recompiler.recompileHopsDag(Recompiler.java:240)
        at org.apache.sysml.runtime.controlprogram.ProgramBlock.execute(ProgramBlock.java:147)
        ... 14 more

The root cause was a simplification rewrite for binary matrix-scalar operations which did not account for unsupported scalar operations such as OpOp2.QUANTILE, OpOp2.CENTRALMOMENT, OpOp2.MINUS1_MULT, OpOp2.MINUS_NZ, OpOp2.LOG_NZ.