Function bayesian_multi_objective 

pub fn bayesian_multi_objective<F>(
    f: &F,
    config: BayesOptConfig,
) -> Result<BayesOptParetoReport>
where
    F: Fn(&Array1<f64>) -> Vec<f64> + Sync,

Minimise a vector objective with Monte-Carlo EHVI.

This uses one independent GP per objective, samples the joint posterior over each proposed batch, and scores candidates by expected hypervolume improvement. All objectives are minimised.