Athanasios N. Nikolakopoulos — accepted AI-conference papers

2021

Projection techniques to update the truncated SVD of evolving matrices with applications

Vasileios Kalantzis, Georgios Kollias, Shashanka Ubaru, Athanasios N. Nikolakopoulos, Lior Horesh, Kenneth Clarkson

ICML 2021spotlight

This submission considers the problem of updating the rank-$k$ truncated Singular Value Decomposition (SVD) of matrices subject to the addition of new rows and/or columns over time. Such matrix problems represent an important computational kernel in applications such as Latent Semantic Indexing and…

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2018

Fast Decentralized Learning Via Hybrid Consensus Admm

Meng Ma, Athanasios N. Nikolakopoulos, Georgios B. Giannakis

ICASSP 2018accepted

The Alternating Directions Methods of Multipliers (ADMM) has witnessed a resurgence of interest over the past few years fueled by the ever increasing demand for scalable optimization techniques to tackle real-world statistical learning problems. However, despite its success in several application se…

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2018

Random Walks with Restarts for Graph-Based Classification: Teleportation Tuning and Sampling Design

Dimitris Berberidis, Athanasios N. Nikolakopoulos, Georgios B. Giannakis

ICASSP 2018accepted

The present work introduces methods for sampling and inference for the purpose of semi-supervised classification over the nodes of a graph. The graph may be given or constructed using similarity measures among nodal features. Leveraging the graph for classification builds on the premise that relatio…

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