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Update 11、总结.md
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kjlintong committed Jul 26, 2019
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记住两个向量 x 和 x`间的欧氏距离:


$$ d_{\mathbf{A}}\left(\mathbf{x},\mathbf{x}^{\prime}\right)=\left\|\mathbf{x}-\mathbf{x}^{\prime}\right\| \mathbf{A} \stackrel{\mathrm{def}}{=} \sqrt{\left(\mathbf{x}-\mathbf{x}^{\prime}\right)^{\top} \mathbf{A}\left(\mathbf{x}-\mathbf{x}^{\prime}\right)} $$

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