public class AUC extends java.lang.Object
In statistics, a receiver operating characteristic (ROC), or ROC curve, is a graphical plot that illustrates the performance of a binary classifier system as its discrimination threshold is varied. The curve is created by plotting the true positive rate (TPR) against the false positive rate (FPR) at various threshold settings.
AUC is quite noisy as a classification measure and has some other significant problems in model comparison.
We calculate AUC based on Mann-Whitney U test (https://en.wikipedia.org/wiki/Mann-Whitney_U_test).
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Caulculate AUC for binary classifier.