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

amitd

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)

MartinLiebig

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

amitd

Okay, thanks.