Function compute_optimal_weights 

pub fn compute_optimal_weights(
    t_val: f64,
    n_val: f64,
    sd_i: f64,
    sd_m: f64,
    sd_t: f64,
    sd_n: f64,
    o_m: f64,
    o_i: f64,
    o_j: f64,
    o_mn: f64,
) -> OptimalWeights