no code implementations • 20 Dec 2023 • Zhuangzhuang Jia, Grani A. Hanasusanto, Phebe Vayanos, Weijun Xie
We consider the problem of learning fair policies for multi-stage selection problems from observational data.
no code implementations • 12 May 2023 • Yongchun Li, Weijun Xie
A Low-rank Spectral Optimization Problem (LSOP) minimizes a linear objective subject to multiple two-sided linear matrix inequalities intersected with a low-rank and spectral constrained domain set.
no code implementations • 28 Oct 2022 • Yongchun Li, Weijun Xie
These conditions can be very useful to identify new results, including the extreme point exactness for a QCQP problem that admits an inhomogeneous objective function with two homogeneous two-sided quadratic constraints and the convex hull exactness for fair SVD.
no code implementations • 29 Mar 2022 • Bo Shen, Weijun Xie, Zhenyu Kong
The objective of this study is to address the problem of background/foreground separation with missing pixels by combining the video acquisition, video recovery, background/foreground separation into a single framework.
no code implementations • 22 Dec 2020 • Qing Ye, Weijun Xie
We prove that in the proposed framework, when the classification outcomes are known, the resulting problem, termed "unbiased subdata selection," is strongly polynomial-solvable and can be used to enhance the classification fairness by selecting more representative data points.
1 code implementation • 28 Aug 2020 • Yongchun Li, Weijun Xie
Sparse PCA (SPCA) is a fundamental model in machine learning and data analytics, which has witnessed a variety of application areas such as finance, manufacturing, biology, healthcare.
1 code implementation • 23 Jan 2020 • Yongchun Li, Weijun Xie
By developing new mathematical tools for the singular matrices and analyzing the Lagrangian dual of the proposed convex integer program, we investigate the widely-used local search algorithm and prove its first-known approximation bound for MESP.
no code implementations • 23 Feb 2018 • Mohit Singh, Weijun Xie
For the combinatorial experimental design problem, the goal is to pick $k$ out of the given $n$ experiments so as to make the most accurate estimate of the unknown parameters, denoted as $\hat{\beta}$.