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Get confused in PCA Whitening

Open silverHugh opened this issue 6 years ago • 0 comments

In section Recovering an Approximation of the Data, isn't img a vector?

If so, why do we get:

\hat{x}  =  \sum_{i=1}^k u_i \tilde{x}_i

silverHugh avatar Mar 13 '18 01:03 silverHugh