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"Balanced sampling"

frankieUser: "frankie"
frankie
New Altair Community Member
Updated by Jocelyn
A question. When I want to create a balanced training dataset using the "Sample" operator I get an error:
"Given index '4000' does not fit the mapped ExampleSet".

My data has two labels, "-1" and "1" and I try to take a 2000 sample from each of them.
The error comes during XValidation (not for example during preprocessing)

Can somebody help out, or guide me how these samples should/can be taken?
I realize it could be hard to pinpoint the source of the problem, but any ideas? The flow workds perfectly without the sampling operator.


-----------------------------------------------------

Exception: java.lang.RuntimeException
Message: Given index '4000' does not fit the mapped ExampleSet!
Stack trace:

  com.rapidminer.example.set.MappedExampleSet.getExample(MappedExampleSet.java:137)
  com.rapidminer.example.set.NonSpecialAttributesExampleSet.getExample(NonSpecialAttributesExampleSet.java:78)
  com.rapidminer.example.set.RemappedExampleSet.getExample(RemappedExampleSet.java:128)
  com.rapidminer.example.set.SplittedExampleSet.getExample(SplittedExampleSet.java:200)
  com.rapidminer.example.set.IndexBasedExampleSetReader.hasNext(IndexBasedExampleSetReader.java:62)
  com.rapidminer.example.set.AttributesExampleReader.hasNext(AttributesExampleReader.java:52)
  com.rapidminer.operator.learner.functions.kernel.evosvm.EvoSVMModel.performPrediction(EvoSVMModel.java:178)
  com.rapidminer.operator.learner.PredictionModel.apply(PredictionModel.java:76)
  com.rapidminer.operator.ModelApplier.doWork(ModelApplier.java:100)
  com.rapidminer.operator.Operator.execute(Operator.java:771)
  com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
  com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:709)
  com.rapidminer.operator.validation.ValidationChain.executeEvaluator(ValidationChain.java:211)
  com.rapidminer.operator.validation.ValidationChain.evaluate(ValidationChain.java:307)
  com.rapidminer.operator.validation.XValidation.performIteration(XValidation.java:143)
  com.rapidminer.operator.validation.XValidation.estimatePerformance(XValidation.java:133)
  com.rapidminer.operator.validation.ValidationChain.doWork(ValidationChain.java:261)
  com.rapidminer.operator.Operator.execute(Operator.java:771)
  com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
  com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:709)
  com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:368)
  com.rapidminer.operator.Operator.execute(Operator.java:771)
  com.rapidminer.Process.run(Process.java:899)
  com.rapidminer.Process.run(Process.java:795)
  com.rapidminer.Process.run(Process.java:790)
  com.rapidminer.Process.run(Process.java:780)
  com.rapidminer.gui.ProcessThread.run(ProcessThread.java:62)

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