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fix zn-md
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src/content/blog/zh/miniob-vector-database.md

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### 3.1 距离计算的数学原理
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对于两个 \(n\) 维向量 \(\mathbf{a}\)\(\mathbf{b}\),欧几里得距离(L2)定义为:
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对于两个 $n$ 维向量 $\mathbf{a}$$\mathbf{b}$,欧几里得距离(L2)定义为:
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$$ d(\mathbf{a}, \mathbf{b}) = \|\mathbf{a} - \mathbf{b}\|_2 = \sqrt{\sum_{i=1}^{n} (a_i - b_i)^2} $$
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$$
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d(\mathbf{a}, \mathbf{b}) = \|\mathbf{a} - \mathbf{b}\|_2 = \sqrt{\sum_{i=1}^{n} (a_i - b_i)^2}
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$$
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在比较大小时,我们通常省略开方运算以减少 CPU 开销。
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