2 papers
math.OC2026
Proximity Operator of the over Function
Lixin Shen, Guohui Song
We study the complete, possibly set-valued proximity operator of the nonconvex, scale-invariant ratio \(h(\vx)=\|\vx\|_{1}/\|\vx\|_{2}\). A polar decomposition of the nonzero branc…
cs.LG2024
Hyperparameter Estimation for Sparse Bayesian Learning Models
Feng Yu, Lixin Shen, Guohui Song
Sparse Bayesian Learning (SBL) models are extensively used in signal processing and machine learning for promoting sparsity through hierarchical priors. The hyperparameters in SBL…