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Update 82.k最近邻算法.md #1084

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Expand Up @@ -258,6 +258,7 @@ $$
上面的例子，模型预测的精确率为： $\frac{80}{80 + 30} = \frac{80}{110} = 0.73$ 。

3. **召回率**（Recall）。召回率用于衡量在所有实际为正类的样本中，被模型正确预测为正类的比例，通常也被称为查全率或真正例率（True Positive Rate）。

$$
\text{Recall} = \frac{\text{TP}}{\text{TP} + \text{FN}}
$$
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