Find Threshold (Meta)


Synopsis

Determines confidence thresholds based on misclassification costs, also possible to define costs for the option non-classified.


Description

This operator uses a set of class weights and also allows a weight for the fact that an example is not classified at all (marked as unknown). Based on the predictions of the model of the inner learner this operator optimized a set of thresholds regarding the defined weights.

This operator might be very useful in cases where it is better to not classify an example then to classify it in a wrong way. This way, it is often possible to get very high accuracies for the remaining examples (which are actually classified) for the cost of having some examples which must still be manually classified.


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ExampleProcess