精确率、召回率、F1 值、ROC、AUC 各自的优缺点是什么？
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precision是相对你自己的模型预测而言：true positive ／retrieved set。假设你的模型一共预测了100个正例，而其中80个是对的正例，那么你的precision就是80%。我们可以把precision也理解为，当你的模型作出一个新的预测时，它的confidence score 是多少，或者它做的这个预测是对的的可能性是多少。
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