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Velocity Ambiguity Profiles: Time-Resolved Bayes-Risk Diagnostics for Flow Matching

Yunpeng Mei, Xiaowen Zhu, Chenyu Wang, Chenbo Xin, Hongjie Cao, Jiamin Wang, Jie Chen, Gang Wang · 2026 · arXiv

DOI: 10.48550/arXiv.2610.30107 · open-access PDF

Portuguese

A correspondência de fluxo treina um continuum de problemas de regressão de velocidade, mas geralmente relata uma perda média durante o tempo de interpolação, obscurecendo quais regiões são limitadas por ambiguidade intrínseca e que permanecem limitadas por dados. Introduzimos o Perfil de Ambiguidade de Velocidade (VAP), $\mathcal{A}_v(t)$, o tempo-local Bayes-nível de risco de previsão de velocidade, e decompor a perda resolvida no tempo como $L_N(t)=\mathcal{A}_v(t)+R(t;N)$, onde apenas o excesso de termo $R(t;N)$ é reduzível por mais ou um estimador diferente de dados. Para amostras de treinamento de $N$ e uma

Machine translation (Meta M2M100); the English original follows.

Abstract

Flow matching trains a continuum of velocity regression problems but usually reports a loss averaged over interpolation time, obscuring which regions are limited by intrinsic ambiguity and which remain data-limited. We introduce the Velocity Ambiguity Profile (VAP), $\mathcal{A}_v(t)$, the time-local Bayes-risk floor of velocity prediction, and decompose time-resolved loss as $L_N(t)=\mathcal{A}_v(t)+R(t;N)$, where only the excess term $R(t;N)$ is reducible by more data or a different estimator. For $N$ training samples and a $K$-component mixture in the structured example, we prove two statis

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