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I am trying to do matrix factorization.

$ \frac{1}{2} \vert\vert X - WZ ^T \vert\vert ^2_F $

How do I find the derivative wrt W ?

I am just told that it is $ W^T = (Z^TZ + \lambda I_K)^{-1}Z^TX^T $

I come from a lousy school please help show me the way.

Kong
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