exacity / exacity/deeplearningbook-chinese

第2.12主成分错误求助

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![image](https://user-images.githubusercontent.com/32677777/105842203-ca04fd80-6010-11eb-8473-62ff0880eb89.png)
前面的和形式是矩阵的F范数，为什么中间变成向量的2范数，之后又是F范数

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