Remove Sparsity from metrics logging #124
Merged
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Sparsity has been used to characterize the diversity of the PFs and compare algorithms.
We noticed in a few papers that this metric actually does not characterize what we want because it computes the indicator only based on the points identified by the algorithm this means that an algorithm finding one or more very close points will have a low sparsity (which is supposed to be good, but it's not).
Instead, we should have a metric that computes diversity over the full objective space. But this requires extreme points for each environment I think. We welcome contributions of good diversity metrics if that exists.