Function weighted_sum_optimize 

pub fn weighted_sum_optimize<F>(
    objectives: F,
    weights: &[f64],
    bounds: &[(f64, f64)],
    n_starts: usize,
    seed: u64,
) -> (Vec<f64>, Vec<f64>)
where
    F: Fn(&[f64]) -> Vec<f64>,

Minimize a weighted sum of objectives via multi-start coordinate descent.

Returns

(x_best, f_best) — optimal decision vector and objective values.