In order to evaluate the quality of the generated Pareto fronts by
multi-objective algorithms, some performance metrics are proposed
in the related studies to assess the quality of generated PFs. In
this paper, the following three metrics are used: Spacing, Maximum
spread, and Coverage. The main reason for selecting these metrics is
that each one of them represents a certain aspect of PFs. Additionally;
it is simple to calculate them since none of them requires
having the true PF for the evaluation.