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Ô­ÎĵØÖ·https://www.cnblogs.com/limitlessun/p/8611103.html\begin{aligned}<br> \hat{y} &= w_\mathrm{ridge}^T\phi(x) = \phi^T(x)(\Phi^T\Phi + \lambda I)^{-1}\Phi^T y \\<br> &= \sum_{i=1}^N \phi^T(x)(\Phi^T\Phi

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