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5.8.1 内容与公式中英文不一致 #1

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GdZ opened this issue May 21, 2018 · 1 comment
Open

5.8.1 内容与公式中英文不一致 #1

GdZ opened this issue May 21, 2018 · 1 comment

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@GdZ
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GdZ commented May 21, 2018

  1. 英文148页公式5.93和中文公式5.93不一致

    • 英文:
      $$=\frac{1}{m-1}W^TX^TXW$$

    • 中文:
      $$=\frac{1}{m-1}W^TX^TX^TW$$

  2. 中文少了一句话

    • 英文
      where we use the fact that $U^TU = I$ because the U matrix of the singular value definition is defined to be orthonormal. This shows that if we take $z=x^TW$, we can ensure that the covariance of z is diagonal as required:

    • 中文
      其中,我们使用 $U^TU = I$,因为根据奇异值的定义矩阵 U 是正交的。这表明 z 的协方差满足对角的要求:

@zsdonghao
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@GdZ Thanks, got it.

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