Smooth Sensitivity for Learning Differentially-Private yet Accurate Rule Lists

18 Mar 2024  ·  Timothée Ly, Julien Ferry, Marie-José Huguet, Sébastien Gambs, Ulrich Aivodji ·

Differentially-private (DP) mechanisms can be embedded into the design of a machine learningalgorithm to protect the resulting model against privacy leakage, although this often comes with asignificant loss of accuracy. In this paper, we aim at improving this trade-off for rule lists modelsby establishing the smooth sensitivity of the Gini impurity and leveraging it to propose a DP greedyrule list algorithm. In particular, our theoretical analysis and experimental results demonstrate thatthe DP rule lists models integrating smooth sensitivity have higher accuracy that those using otherDP frameworks based on global sensitivity.

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