Pessimistic bilevel optimization, which tunes hyperparameters against the worst-case inner-level model, gives more robust binary classifiers than optimistic bilevel tuning under limited or perturbed data.
Necessary optimality conditions in pessimistic bilevel programming
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Hyperparameter Tuning Through Pessimistic Bilevel Optimization
Pessimistic bilevel optimization, which tunes hyperparameters against the worst-case inner-level model, gives more robust binary classifiers than optimistic bilevel tuning under limited or perturbed data.