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cs.LG2024
Enhancing Missing Data Imputation through Combined Bipartite Graph and Complete Directed Graph
Zhaoyang Zhang, Hongtu Zhu, Ziqi Chen +2
In this paper, we aim to address a significant challenge in the field of missing data imputation: identifying and leveraging the interdependencies among features to enhance missing…
cs.LG2024
Sampling-guided Heterogeneous Graph Neural Network with Temporal Smoothing for Scalable Longitudinal Data Imputation
Zhaoyang Zhang, Ziqi Chen, Qiao Liu +2
In this paper, we propose a novel framework, the Sampling-guided Heterogeneous Graph Neural Network (SHT-GNN), to effectively tackle the challenge of missing data imputation in lon…
math.ST2024
Nodewise Loreg: Nodewise -penalized Regression for High-dimensional Sparse Precision Matrix Estimation
Hai Shu, Ziqi Chen, Yingjie Zhang +1
We propose Nodewise Loreg, a nodewise -penalized regression method for estimating high-dimensional sparse precision matrices. We establish its asymptotic properties, including…