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Need a working example of Find Threshold (Meta) operator in RapidMiner
I am using k-NN models and have 11 different classes and a corpus of about 300-500 text documents as test dataset.
Specifically, I don't see any impact of putting a learner inside the operator since performance values are always the same, whether I do assign any weights to the classes or not. Moreover, there's no explanation what are the weights of classes are. And moreover, I don't see any way to extract (possibly) generated thresholds as the output of this operator in order to apply them to the model. And there's no RapidMiner documentation entry for this operator at all.
Does anyone have a working example of Find Threshold (Meta) operator so far?