Wasserstein generative adversarial networks are minimax optimal distribution estimators
Wasserstein生成对抗网络作为极小极大最优分布估计量AI 解读 ↓
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Wasserstein生成对抗网络作为极小极大最优分布估计量AI 解读 ↓
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We provide nonasymptotic rates of convergence of the Wasserstein Generative Adversarial networks (WGAN) estimator. We build neural networks classes representing the generators and discriminators which yield a GAN that achieves the minimax optimal rate for estimating a certain probability measure μ with support in Rp. The probability μ is considered to be the push forward of the Lebesgue measure on the d-dimensional torus Td by a map g⋆:Td→Rp of smoothness β+1. Measuring the error with the γ-Hölder Integral Probability Metric (IPM), we obtain up to logarithmic factors, the minimax optimal rate O(n−β+γ2β+d∨n−12) where n is the sample size, β determines the smoothness of the target measure μ, γ is the smoothness of the IPM (γ=1 is the Wasserstein case) and d≤p is the intrinsic dimension of μ. In the process, we derive a sharp interpolation inequality between Hölder IPMs. This novel result of theory of functions spaces generalizes classical interpolation inequalities to the case where the measures involved have densities on different manifolds.