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How to draw ROC curve for a multi-class dataset?

Time:10-23

I have a multi-class confusion matrix as below and would like to draw its associated ROC curve for one of its classes (e.g. class 1). I know the "one-VS-all others" theory should be used in this case, but I want to know how exactly we need to change the threshold to obtain different pairs of TP and corresponding FP rates.And the output...

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