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单选题
有关机器学习分类算法的Precision和Recall，以下定义中正确的是（假定tp = true positive, tn = true negative, fp = false positive, fn = false negative）（）
A
A.Precision= tp / (tp + fp), Recall = tp / (tp + fn)
B
B.Precision = tp / (tn + fp), Recall = tp /(tp + fn)
C
C.Precision = tp / (tn + fn), Recall = tp /(tp + fp)
D
D.Precision = tp / (tp + fp), Recall = tp /(tn + fn)
E
啊啊啊
答案解析
正确答案：A
