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stat.ML2026
Unbounded Density Ratio Estimation and Its Application to Covariate Shift Adaptation
Ren-Rui Liu, Jun Fan, Lei Shi +1
This paper focuses on the problem of unbounded density ratio estimation -- an understudied yet critical challenge in statistical learning -- and its application to covariate shift…
cs.LG2026
Variance-Aware Adaptive Weighting for Diffusion Model Training
Nanlong Sun, Lei Shi
Diffusion models have recently achieved remarkable success in generative modeling, yet their training dynamics across different noise levels remain highly imbalanced, which can lea…