Which Generative Adversarial Networks (GANs) generates the most plausible images? has been a frequently asked question among researchers. To address this problem, we first propose an emph{incomplete} U-statistics estimate of maximum mean discrepancy $mathrm{MMD}_{inc}$ to measure the distribution discrepancy between generated and real images. $mathrm{MMD}_{inc}$ enjoys the advantages of asymptotic normality, computation efficiency, and model agnosticity. We then propose a GANs analysis framework to select and test the best member in GANs family using the Post Selection Inference (PSI) with $mathrm{MMD}_{inc}$. In the experiments, we adopt the proposed framework on 7 GANs variants and compare their $mathrm{MMD}_{inc}$ scores.
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