Papers › Differential Privacy has Bounded Impact on Fairness in Classification

Differential Privacy has Bounded Impact on Fairness in Classification

28 Oct 2022arXiv:2210.16242archive 2025-07-28

Paul Mangold, Michaël Perrot, Aurélien Bellet, Marc Tommasi

We theoretically study the impact of differential privacy on fairness in classification. We prove that, given a class of models, popular group fairness measures are pointwise Lipschitz-continuous with respect to the parameters of the model. This result is a consequence of a more general statement on accuracy conditioned on an arbitrary event (such as membership to a sensitive group), which may be of independent interest. We use this Lipschitz property to prove a non-asymptotic bound showing that, as the number of samples increases, the fairness level of private models gets closer to the one of their non-private counterparts. This bound also highlights the importance of the confidence margin of a model on the disparate impact of differential privacy.

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