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A Nearly Instance-optimal Differentially Private Mechanism for Conjunctive Queries (2105.05443v3)
Published 12 May 2021 in cs.DB and cs.CR
Abstract: Releasing the result size of conjunctive queries and graph pattern queries under differential privacy (DP) has received considerable attention in the literature, but existing solutions do not offer any optimality guarantees. We provide the first DP mechanism for this problem with a fairly strong notion of optimality, which can be considered as a natural relaxation of instance-optimality to a constant.