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How can I add decision threshold to KNN classifier?

I am using the KNN classifier with BoW descriptor histograms. I would like to find a threshold between the matches. How can I do that?

How can I add decision threshold to KNN classifier?

I am using the KNN classifier with BoW descriptor histograms. I would like to find a threshold between the matches. So that if the value is higher than a threshold consider that the classification has been done well, if not, show the best two classes of the results. How can I do that?