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【单选题】
F1 score可用于衡量分类模型性能，根据以下混淆矩阵，F1 = _________。真实类预测类Class = YesClass = NoClass = Yes（正例）abClass = No（反例）cd
A.
(a +d)/(a+b+c+d)
B.
a/(a+c)
C.
a/(a+b)
D.
2a/(2a+b+c)
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