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Weihang Xu

5 accepted papers

2026

Convergence Dynamics of Over-Parameterized Score Matching for a Single Gaussian

ICLR 2026poster

Score matching has become a central training objective in modern generative modeling, particularly in diffusion models, where it is used to learn high-dimensional data distributions through the estimation of score functions. Despite its empirical success, the theoretical understanding of the optimiz…

Cited by 0SourceScholar
2026

Draft-and-Audit Reinforcement Learning for Optimization Modeling

ICML 2026poster

Natural language to optimization (NL2Opt) requires translating unstructured text into executable mathematical models. Beyond simple syntax errors, this task suffers from silent modeling failures, where incorrect formulations execute successfully but yield invalid results. We propose Draft-and-Audit …

Cited by 0SourceScholar
2026

Simultaneous Confidence Bounds for Aggregated Effects via Exact Subset Optimization

ICML 2026poster

We study simultaneous confidence bounds for aggregated effects over downward-closed subset families of independent statistical tests. The bounds are obtained by bootstrap calibration of the maximum normalized aggregated effect over the relevant subset family, yielding valid post-hoc inference for da…

Cited by 0SourceScholar
2024

Toward Global Convergence of Gradient EM for Over-Paramterized Gaussian Mixture Models

NeurIPS 2024poster

We study the gradient Expectation-Maximization (EM) algorithm for Gaussian Mixture Models (GMM) in the over-parameterized setting, where a general GMM with $n>1$ components learns from data that are generated by a single ground truth Gaussian distribution. While results for the special case of 2-Ga…

Cited by 1SourcePDFScholar
2022

Combinatorial Bandits with Linear Constraints: Beyond Knapsacks and Fairness

NeurIPS 2022accept

This paper proposes and studies for the first time the problem of combinatorial multi-armed bandits with linear long-term constraints. Our model generalizes and unifies several prominent lines of work, including bandits with fairness constraints, bandits with knapsacks (BwK), etc. We propose an upp…

Cited by 25SourcePDFScholar