How to find the threshold value from KNN classification

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Hi all,
I want to ask that I have total 100 classes [1,2,3,4,5......100] One class having 12 samples from which 8
samples for training, like (100 * 8 = 800 samples for traning). Remaining 4 samples for testing,like
that(100 * 4=400 samples for testing.
Now, I need to find threshold values, which will assist me in identifying Threshold,FAR,FRR, by using
I have studied perfcurve function, but I don't know how can I measure the threshold values 100 classes.
Please guide me how can I do it?

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