Accuracy:(TP+TN)/all
F-value:2*recall*precision/(recall+precision)
G-mean:sqrt(precision*recall)
AUC:曲线下面积
https://www.jianshu.com/p/3e8b9f2764c8
Recall =TPrate =TP/(TP+FN),
Precision =PPvalue = TP/(TP+FP),
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