fig2

Figure 2. Illustration of hypervolume for a convex minimization problem in bi-objective space. The red line represents the ground truth PF, while the blue points and region reflect the best-known solutions and their associated hypervolume, respectively. The green point and region are then used to illustrate the contribution of a newly evaluated solution. The computation of hypervolume in objective space is performed with respect to a lower bound with a reference point, shown by the red star. PF: Pareto Front.