Function styblinski_tang

pub fn styblinski_tang<T>(param: &[T]) -> T
where
    T: Float + FromPrimitive + Sum,

Styblinski-Tang test function.

Defined as

$$ f(x_1,\,x_2,\,\ldots,\,x_d) = \frac{1}{2}\sum_{i=1}^{d} \left(x_i^4 - 16x_i^2 + 5x_i\right) $$

where $x_i \in [-5, 5]$.

The global minimum is at $f(x_1, x_2, …, x_d) = f(-2.903534,\,-2.903534,\,\ldots,\,-2.903534) = -39.16616d$.