83 citations · 181 across the 6 of their papers we have counts for
6 papers
Inhomogeneous graph trend filtering via a l2,0 cardinality penalty
Xiaoqing Huang, Andersen Ang, Kun Huang +2
We study estimation of piecewise smooth signals over a graph. We propose a -norm penalized Graph Trend Filtering (GTF) model to estimate piecewise smooth graph signals…
MGProx: A nonsmooth multigrid proximal gradient method with adaptive restriction for strongly convex optimization
Andersen Ang, Hans De Sterck, Stephen Vavasis
We study the combination of proximal gradient descent with multigrid for solving a class of possibly nonsmooth strongly convex optimization problems. We propose a multigrid proxima…
Fast Projection onto the Capped Simplex with Applications to Sparse Regression in Bioinformatics
Andersen Ang, Jianzhu Ma, Nianjun Liu +2
We consider the problem of projecting a vector onto the so-called k-capped simplex, which is a hyper-cube cut by a hyperplane. For an n-dimensional input vector with bounded elemen…
Blind Audio Source Separation with Minimum-Volume Beta-Divergence NMF
Valentin Leplat, Nicolas Gillis, Man Shun Ang
Considering a mixed signal composed of various audio sources and recorded with a single microphone, we consider on this paper the blind audio source separation problem which consis…
Algorithms and Comparisons of Non-negative Matrix Factorization with Volume Regularization for Hyperspectral Unmixing
M. S. Ang, Nicolas Gillis
In this work, we consider nonnegative matrix factorization (NMF) with a regularization that promotes small volume of the convex hull spanned by the basis matrix. We present highly…
Accelerating Nonnegative Matrix Factorization Algorithms using Extrapolation
Andersen Man Shun Ang, Nicolas Gillis
In this paper, we propose a general framework to accelerate significantly the algorithms for nonnegative matrix factorization (NMF). This framework is inspired from the extrapolati…