PRML PRML

$\mathbb{R}^{\it{M}}$

$\it{k}(\mathbf{x,x}')=\rm{exp}(-\parallel\mathbf{x-x'}\parallel^2/2\sigma^2)\tag{6.23}$

$\it{k}(\mathbf{x,x'})=\rm{exp}\left(-\frac{1}{2\sigma^2}(\kappa(\mathbf{x,x})+\kappa(\mathbf{x',x'})-2\kappa(\mathbf{x,x'}))\right)\tag{6.26}$

$\it{k}(\it{A}_1,\it{A}_2)=2^{\left|\it{A}_1\cap\it{A}_2\right|}\tag{6.27}$

$\it{k}(\mathbf{x,x'})=\rm{tanh}(\it{a}\mathbf{x}^T\mathbf{x}'+b)\tag{6.37}$

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