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Workshop: Theory and Practice of Differential Privacy

Privately Publishable Per-instance Privacy: An Extended Abstract

Rachel Redberg · Yu-Xiang Wang


We consider how to release personalized privacy losses using per-instance differential privacy (pDP), focusing on private empirical risk minimization over the class of generalized linear models. Standard differential privacy (DP) gives us a worst-case bound that might be orders of magnitude larger than the privacy loss to a particular individual relative to a fixed dataset. The pDP framework provides a more fine-grained analysis of the privacy guarantee to a target individual, but the per-instance privacy loss itself might be a function of sensitive data. In this paper, we analyze the per-instance privacy loss of releasing a private empirical risk minimizer learned via objective perturbation, and propose a group of methods to privately and accurately publish the pDP losses at little to no additional privacy cost.

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