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周志华机器学习
2022-08-04 05:29:00 【视觉菜鸟Leonardo】
1.
真正例率(TPR)、假正例率(FPR)与查准率(P)、查全率(R)之间的联系:
查全率: 真实正例被预测为正例的比例
真正例率: 真实正例被预测为正例的比例
显然查全率与真正例率是相等的。
查准率:预测为正例的实例中真实正例的比例
假正例率: 真实反例被预测为正例的比例
2.损失函数其实就是算罚分,模型预测质量越差,罚分越多。
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