func OneNorm(x Const) float64 { return vec.Sum(Abs(x)) }
func LpNorm(x Const, p float64) float64 { return math.Pow(vec.Sum(vec.Pow(Abs(x), p)), 1/p) }
func SqrNorm(x Const) float64 { return vec.Sum(vec.Square(Abs(x))) }