Yiwei Zhou

2 papers indexed

arxivstat.MLcs.LGmath.OC2026-07-21

RELTA-SGLD: Relative-Growth Localized Taming for Nonconvex Stochastic-Gradient Langevin Learning

We introduce RELTA-SGLD, a taming scheme that stabilizes superlinear stochastic-gradient updates while reducing unnecessary suppression of the original learning drift. A threshold determines where the taming turns on, while a relative-growth principle derived from the one-step Ly…

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arxivstat.MLcs.LGmath.NAmath.PR2026-07-09

Score Accuracy Along the Forward Diffusion Does Not Certify Numerical Stability in Diffusion Sampling

Yiwei Zhou

Score matching controls average error under the forward marginals, but a discretized reverse-time sampler evaluates the learned score along its own trajectory. We show that small forward-marginal error does not guarantee numerical stability. We construct a single smooth score fie…

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