[mlpack-git] [mlpack/mlpack] Added the discretize function. Design changes as discussed. (#703)

[Tham]

> +        HistArr(r, c, o1) += Magnitude(i, j) * (1 + (int)o - o);
> +        HistArr(r, c, o2) += Magnitude(i, j) * (o - (int) o);
> +      }
> +      else
> +      {
> +        o1 = (size_t) (Orientation(i, j) / o_range + 0.5) % numOrient;
> +        HistArr(r, c, o1) += Magnitude(i, j);
> +      }
> +    }
> +  }
> +
> +  HistArr = HistArr / downscale;
> +
> +  for (size_t i = 0; i < HistArr.n_slices; ++i)
> +    HistArr.slice(i) = arma::square(HistArr.slice(i));
> +}

arma::square works for Cube<T> too, following should work

`HistArr = arma::square(HistArr);`

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