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Hanru Bai

4 accepted papers

2025

Hierarchical Koopman Diffusion: Fast Generation with Interpretable Diffusion Trajectory

NeurIPS 2025poster

Diffusion models have achieved impressive success in high-fidelity image generation but suffer from slow sampling due to their inherently iterative denoising process. While recent one-step methods accelerate inference by learning direct noise-to-image mappings, they sacrifice the interpretability an…

Cited by 0SourceScholar
2025

KoNODE: Koopman-Driven Neural Ordinary Differential Equations with Evolving Parameters for Time Series Analysis

ICML 2025poster

Neural ordinary differential equations (NODEs) have demonstrated strong capabilities in modeling time series. However, existing NODE- based methods often focus solely on the surface-level dynamics derived from observed states, which limits their ability to capture more complex underlying behaviors.…

Cited by 0SourcePDFScholar
2025

KooNPro: A Variance-Aware Koopman Probabilistic Model Enhanced by Neural Process for Time Series Forecasting

ICLR 2025poster

The probabilistic forecasting of time series is a well-recognized challenge, particularly in disentangling correlations among interacting time series and addressing the complexities of distribution modeling. By treating time series as temporal dynamics, we introduce **KooNPro**, a novel probabilisti…

Cited by 0SourcePDFScholar
2023

Semi-Supervised Contrastive Learning for Deep Regression with Ordinal Rankings from Spectral Seriation

NeurIPS 2023poster

Contrastive learning methods can be applied to deep regression by enforcing label distance relationships in feature space. However, these methods are limited to labeled data only unlike for classification, where unlabeled data can be used for contrastive pretraining. In this work, we extend contrast…