Search Results for author: Weijun Xie

Found 8 papers, 2 papers with code

On the Partial Convexification for Low-Rank Spectral Optimization: Rank Bounds and Algorithms

no code implementations12 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.

On the Exactness of Dantzig-Wolfe Relaxation for Rank Constrained Optimization Problems

no code implementations28 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.

Smooth Robust Tensor Completion for Background/Foreground Separation with Missing Pixels: Novel Algorithm with Convergence Guarantee

no code implementations29 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.

Unbiased Subdata Selection for Fair Classification: A Unified Framework and Scalable Algorithms

no code implementations22 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.

Classification Fairness +1

Exact and Approximation Algorithms for Sparse PCA

1 code implementation28 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.

Dimensionality Reduction feature selection

Best Principal Submatrix Selection for the Maximum Entropy Sampling Problem: Scalable Algorithms and Performance Guarantees

1 code implementation23 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.

Approximation Algorithms for D-optimal Design

no code implementations23 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 $\hat{\beta}$.

Experimental Design

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