Solution
= Solution
The <Gaussian kernel> with bandwidth $\sigma^2>0$ is
$$
\boxed{k_\sigma(x,y)=\exp\!\left(-\frac{\|x-y\|_2^2}{2\sigma^2}\right).}
$$
= Solution
The <Gaussian kernel> with bandwidth $\sigma^2>0$ is
$$
\boxed{k_\sigma(x,y)=\exp\!\left(-\frac{\|x-y\|_2^2}{2\sigma^2}\right).}
$$