Privacy Constrained Fairness Estimation for Decision Trees

• URL: http://arxiv.org/abs/2312.08413v1
• Date: Wed, 13 Dec 2023 14:54:48 GMT
• Title: Privacy Constrained Fairness Estimation for Decision Trees
• Authors: Florian van der Steen, Fr\'e Vink and Heysem Kaya
• Abstract summary: Measuring the fairness of any AI model requires the sensitive attributes of the individuals in the dataset. We propose a novel method, dubbed Privacy-Aware Fairness Estimation of Rules (PAFER) We show that using the Laplacian mechanism, the method is able to estimate SP with low error while guaranteeing the privacy of the individuals in the dataset with high certainty.
• Score: 2.9906966931843093
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: The protection of sensitive data becomes more vital, as data increases in value and potency. Furthermore, the pressure increases from regulators and society on model developers to make their Artificial Intelligence (AI) models non-discriminatory. To boot, there is a need for interpretable, transparent AI models for high-stakes tasks. In general, measuring the fairness of any AI model requires the sensitive attributes of the individuals in the dataset, thus raising privacy concerns. In this work, the trade-offs between fairness, privacy and interpretability are further explored. We specifically examine the Statistical Parity (SP) of Decision Trees (DTs) with Differential Privacy (DP), that are each popular methods in their respective subfield. We propose a novel method, dubbed Privacy-Aware Fairness Estimation of Rules (PAFER), that can estimate SP in a DP-aware manner for DTs. DP, making use of a third-party legal entity that securely holds this sensitive data, guarantees privacy by adding noise to the sensitive data. We experimentally compare several DP mechanisms. We show that using the Laplacian mechanism, the method is able to estimate SP with low error while guaranteeing the privacy of the individuals in the dataset with high certainty. We further show experimentally and theoretically that the method performs better for DTs that humans generally find easier to interpret.

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