The Permute-and-Flip Mechanism is Identical to Report-Noisy-Max with Exponential Noise

05/15/2021

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by   Zeyu Ding, et al.

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The permute-and-flip mechanism is a recently proposed differentially private selection algorithm that was shown to outperform the exponential mechanism. In this paper, we show that permute-and-flip is equivalent to the well-known report noisy max algorithm with exponential noise.