Minimal Entropy Partitioning

MartCronos

Hi I am trying to discretize some continuos attributes using MinimalEntropyPartitioning. The process fails with a "Null Pointer exception" message, activating debug mode gives the following:
Exception: java.lang.NullPointerException
Message: null
Stack trace:

  com.rapidminer.operator.preprocessing.discretization.MinimalEntropyDiscretization.createPreprocessingModel(MinimalEntropyDiscretization.java:79)
  com.rapidminer.operator.preprocessing.PreprocessingOperator.apply(PreprocessingOperator.java:63)
  com.rapidminer.operator.Operator.apply(Operator.java:664)
  com.rapidminer.operator.OperatorChain.apply(OperatorChain.java:377)
  com.rapidminer.operator.Operator.apply(Operator.java:664)
  com.rapidminer.Process.run(Process.java:612)
  com.rapidminer.Process.run(Process.java:582)
  com.rapidminer.Process.run(Process.java:572)
  com.rapidminer.gui.ProcessThread.run(ProcessThread.java:61)

Any clues on where the problem is?

Thanx

Ignacio

IngoRM

Hi Ignacio,

could it be that all attributes were removed from the example set since they were discretized into a single bin? In that case, you could try to deactivate "remove_useless".

Cheers,
Ingo