Consider the Radial Basis Kernel $$K(x,z) = \exp\left(-\frac{\|x−z\|^2}{2\sigma^2}\right)$$
Is it possible to find a feature map in this case?
Is it necessary that an explicit feature map exists with all kernels?
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$\begingroup$ For your first q: stats.stackexchange.com/questions/406726/rbf-kernel-mapping/… and second q: stats.stackexchange.com/questions/436971/… $\endgroup$– gunesJul 21, 2020 at 21:51
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