The \(l_{p,q}\) norm of X, \((\sum_k (\sum_l ||X_{k,l}||^p)^{q/p})^{1/q}\).
MixedNorm(X, p = 2, q = 1)The matrix to take the \(l_{p,q}\) norm of
The type of inner norm
The type of outer norm
Returns the mixed norm of X with specified parameters p and q