The paper defines alpha-ex-post Rényi DP with post-processing immunity and proves the Brownian mechanism satisfies it, but the validation-set stopping theorem underlying the experiments is not sound as stated.
24 Table 3: Conversion of ex-post RDP ϵ values used for synthetic data generation to approximate ex-post privacyϵwithδ= 10 −5 using the formula of Ghazi et al
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Accuracy-First R\'enyi Differential Privacy and Post-Processing Immunity
The paper defines alpha-ex-post Rényi DP with post-processing immunity and proves the Brownian mechanism satisfies it, but the validation-set stopping theorem underlying the experiments is not sound as stated.