L0 Norm

#Math

$\displaystyle \left\lVert \vec{x}\right\rVert_{0}=\sum_{n}\mathbb{1}(x_{n}\neq 0)$

• Interestingly, for a given set of points $\displaystyle \vec{x}{i}$, the points that minimizes the sum of euclidean distances to $\displaystyle \vec{x}{i}$ is their modet