feat(metrics): add hypervolume_2d for 2D Pareto fronts

Exact 2D dominated hypervolume against a fixed reference point. Sorts
points by the first minimization-oriented objective ascending, then
sweeps and accumulates the dominated rectangle area against the
reference. Points that don't strictly dominate the reference are
ignored. Panics with a clear message if the objective space does not
have exactly two objectives (spec §14.2).

Tests cover a known-area front, the no-coverage case, and the panic on
non-2D problems.

This commit is contained in:

swaits

2026-05-04 19:26:23 -06:00

parent 69e5dd1249

commit 5672e21c87

2 changed files with 130 additions and 0 deletions

									
										src/metrics/mod.rs
									
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				//! Quality metrics for Pareto fronts.

				pub mod hypervolume;

				pub mod spacing;

				pub use hypervolume::*;

				pub use spacing::*;