ROC曲线，AUC

@ds17 ROC概念 Reciever operating characteristic curve True positive：一个实例是正类并且也被 预测成正类，即为真正类，TP False positive：如果实例是负类被预测成正类，称之为假正类，FP True negative，TN Fasle negative，FN TPR, True positive rate, sensitiv

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