Author

Shi-Wei Ni

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#machine learning Preprint Sep 2026

AECSF: Adaptive Ensemble Conditional Score Filtering for High-Dimensional Nonlinear Data Assimilation

A training-free adaptive ensemble conditional score filter is proposed, which recasts noisy posterior score estimation as estimating the conditional mean of the system state given a noisy reverse particle and the observation, and establishes a bound relating conditional-mean estimation errors to reverse-sampling endpoi...

Yang-Wen Zhang, Shi-Wei Ni, Xiao-Ping Zhang et al. · 0 citations

#machine learning Preprint Sep 2026

FREESIA: Covariance-Aware Posterior Transport for Expressive and Scalable Data Assimilation

The proposed posterior transport method captures complex posterior structure and remains accurate under sparse, nonlinear, and non-injective observations, and reduces RMSE by 56% relative to the best baseline.

Shi-Wei Ni, Yang-Wen Zhang, Hang Qi et al. · 0 citations