Back to search
2402.08077

Diffeomorphic Measure Matching with Kernels for Generative Modeling

Biraj Pandey, Bamdad Hosseini, Pau Batlle, Houman Owhadi

correcthigh confidence
Category
Not specified
Journal tier
Strong Field
Processed
Sep 28, 2025, 12:56 AM

Audit review

Both the paper and the candidate solution prove the same three-term high-probability bound for the MMD of the learned flow: (i) a discretization term scaling like (exp(C1 r)−1) h_S^k, (ii) a statistical term of order N^{-1/2}, and (iii) an approximation/model-misspecification term involving inf_{v∈QQQ_r} ||v−v†||_∞ with a Grönwall factor. The technical ingredients and structure are essentially identical: stability of ODE flows (Grönwall), Lipschitz stability of MMD under perturbations of the transport map, kernel interpolation on scattered sets, and a generalization bound for minimum-MMD learning. The only material difference is the justification of the statistical term: the paper invokes a dedicated generalization theorem for minimum-MMD estimators, while the model sketches a uniform Rademacher argument; the conclusion matches but the paper’s route is cleaner and avoids subtle measurability/dependence issues.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} strong field

\textbf{Justification:}

The work cleanly unifies kernel RKHS modeling of vector-field flows with an MMD objective and proves a clear three-term error bound that captures discretization, statistical generalization, and model misspecification. The proof is technically sound and leverages standard tools appropriately. Minor clarifications on assumptions (stationarity/Lipschitz of K; boundary conditions for V; compact embedding) and a brief roadmap linking lemmas to the main bound would further strengthen readability and rigor.