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BUG REPORT - MetaCost with Linear Discriminant Analysis operator does not work

avdavd Member, University Professor Posts: 44  Maven
The MetaCost operator fails to run when the Linear Discriminant Analysis operator is used as the base learner.

The following Stack Trace is generated in the Debug Mode:

  • Exception: java.lang.NullPointerException
  • Message: null
  • Stack trace:
  • com.rapidminer.example.table.DataRow.set(DataRow.java:84)
  • com.rapidminer.belt.table.ConvertOnWriteExampleTable$1$1.set(ConvertOnWriteExampleTable.java:188)
  • com.rapidminer.example.table.AbstractAttribute.setValue(AbstractAttribute.java:192)
  • com.rapidminer.example.table.DataRow.set(DataRow.java:84)
  • com.rapidminer.example.Example.setValue(Example.java:142)
  • com.rapidminer.example.Example.setConfidence(Example.java:214)
  • com.rapidminer.operator.learner.meta.MetaCostModel.performPrediction(MetaCostModel.java:156)
  • com.rapidminer.operator.learner.PredictionModel.apply(PredictionModel.java:117)
  • com.rapidminer.operator.AbstractModel.apply(AbstractModel.java:82)
  • com.rapidminer.operator.AbstractModel.apply(AbstractModel.java:34)
  • com.rapidminer.operator.ModelApplier.applyModel(ModelApplier.java:140)
  • com.rapidminer.operator.ModelApplier.doWork(ModelApplier.java:125)
  • com.rapidminer.operator.Operator.execute(Operator.java:1023)
  • com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:77)
  • com.rapidminer.operator.ExecutionUnit$2.run(ExecutionUnit.java:805)
  • com.rapidminer.operator.ExecutionUnit$2.run(ExecutionUnit.java:800)
  • java.security.AccessController.doPrivileged(Native Method)
  • com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:800)
  • com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:423)
  • com.rapidminer.operator.Operator.execute(Operator.java:1023)
  • com.rapidminer.Process.executeRoot(Process.java:1464)
  • com.rapidminer.Process.lambda$executeRootInPool$5(Process.java:1443)
  • com.rapidminer.studio.concurrency.internal.AbstractConcurrencyContext$AdaptedCallable.exec(AbstractConcurrencyContext.java:362)
  • java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
  • java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
  • java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
  • java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)
Tagged:

Best Answer

  • mschmitzmschmitz Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, University Professor Posts: 3,128  RM Data Scientist
    Solution Accepted
    Hi,
    I think it cannot work because LDA is one of the rare learners not returning a confidence but MetaCost needs it?

    Still, we should throw a proper error message.

    Best,
    Martin
    - Head of Data Science Services at RapidMiner -
    Dortmund, Germany

Answers

  • avdavd Member, University Professor Posts: 44  Maven
    Okay, thanks.
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