Search Results for author: Athanasios A. Rontogiannis

Found 8 papers, 0 papers with code

Block-Term Tensor Decomposition Model Selection and Computation: The Bayesian Way

no code implementations8 Jan 2021 Paris V. Giampouras, Athanasios A. Rontogiannis, Eleftherios Kofidis

The so-called block-term decomposition (BTD) tensor model, especially in its rank-$(L_r, L_r, 1)$ version, has been recently receiving increasing attention due to its enhanced ability of representing systems and signals that are composed of \emph{blocks} of rank higher than one, a scenario encountered in numerous and diverse applications.

Model Selection Tensor Decomposition +1

Alternating Iteratively Reweighted Minimization Algorithms for Low-Rank Matrix Factorization

no code implementations5 Oct 2017 Paris V. Giampouras, Athanasios A. Rontogiannis, Konstantinos D. Koutroumbas

Nowadays, the availability of large-scale data in disparate application domains urges the deployment of sophisticated tools for extracting valuable knowledge out of this huge bulk of information.

Denoising Matrix Completion

Online Low-Rank Subspace Learning from Incomplete Data: A Bayesian View

no code implementations11 Feb 2016 Paris V. Giampouras, Athanasios A. Rontogiannis, Konstantinos E. Themelis, Konstantinos D. Koutroumbas

Extracting the underlying low-dimensional space where high-dimensional signals often reside has long been at the center of numerous algorithms in the signal processing and machine learning literature during the past few decades.

Dictionary Learning

Sparsity-aware Possibilistic Clustering Algorithms

no code implementations15 Oct 2015 Spyridoula D. Xenaki, Konstantinos D. Koutroumbas, Athanasios A. Rontogiannis

The first one, called sparse possibilistic c-means, exploits sparsity and can deal well with closely located clusters that may also be of significantly different densities.

Clustering

On the convergence of the sparse possibilistic c-means algorithm

no code implementations5 Aug 2015 Spyridoula D. Xenaki, Konstantinos D. Koutroumbas, Athanasios A. Rontogiannis

In this paper, a convergence proof for the recently proposed sparse possibilistic c-means (SPCM) algorithm is provided, utilizing the celebrated Zangwill convergence theorem.

A Novel Adaptive Possibilistic Clustering Algorithm

no code implementations11 Dec 2014 Spyridoula D. Xenaki, Konstantinos D. Koutroumbas, Athanasios A. Rontogiannis

Provided that the algorithm starts with a reasonable overestimate of the number of physical clusters formed by the data, it is capable, in principle, to unravel them (a long-standing issue in the clustering literature).

Clustering

A variational Bayes framework for sparse adaptive estimation

no code implementations13 Jan 2014 Konstantinos E. Themelis, Athanasios A. Rontogiannis, Konstantinos D. Koutroumbas

Recently, a number of mostly $\ell_1$-norm regularized least squares type deterministic algorithms have been proposed to address the problem of \emph{sparse} adaptive signal estimation and system identification.

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