[mlpack-git] [mlpack/mlpack] CNE algorithm (#753)

[Marcus Edel]

> +  return dist(rng);
> +}
> +
> +/**
> + * Return a random float between [x, y]
> + */
> +double RandFloat(double x, double y)
> +{
> +  boost::random::uniform_real_distribution<> dist(x, y);
> +  return dist(rng);
> +}
> +
> +/**
> + * Return the sign of a number.
> + */
> +template <typename T> int sgn(T val)

If we use armadillo's ``sgn`` function, we could remove the utils file, or do we need another function from the header file?

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