Update 如何衡量机器学习分类模型.md #6
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准确率：分类器正确分类的样本数与总体样本数之间的比例。Accuracy=(TP+TN)/(TP+TN+FN+FP)
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准确率：分类器正确分类的样本数与总体样本数之间的比例。Accuracy=(TP+TN)/(TP+TN+FN+FP)