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Separation-Utility Pareto Frontier: An Information-Theore...
[Submitted on 4 Feb 2026 (v1), last revised 13 Jul 2026 (this ve · 2026-02-04 · via stat updates on arXiv.org

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Abstract:We study the Pareto frontier (optimal trade-off) between utility and separation, a fairness criterion requiring predictive independence from sensitive attributes conditional on the true outcome. Through an information-theoretic lens, we prove a characterization of the utility-separation Pareto frontier, establish its concavity, and thereby prove the increasing marginal cost of separation in terms of utility. In addition, we characterize the conditions under which this trade-off becomes strict, providing a guide for trade-off selection in practice. Based on the theoretical characterization, we develop an empirical regularizer based on conditional mutual information (CMI) between predictions and sensitive attributes given the true outcome. The CMI regularizer is compatible with any deep model trained via gradient-based optimization and serves as a scalar monitor of residual separation violations, offering tractable guarantees during training. Finally, numerical experiments support our theoretical findings: across COMPAS, UCI Adult, UCI Bank, and CelebA, the proposed method substantially reduces separation violations while matching or exceeding the utility of established baseline methods. This study thus offers a provable, stable, and flexible approach to enforcing separation in deep learning.

Submission history

From: Shizhou Xu [view email]
[v1] Wed, 4 Feb 2026 10:38:44 UTC (1,795 KB)
[v2] Thu, 5 Feb 2026 17:37:51 UTC (1,795 KB)
[v3] Mon, 13 Jul 2026 07:50:23 UTC (1,268 KB)