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Athanasios N. Nikolakopoulos

Trust your neighbors: A comprehensive survey of neighborhood-based methods for recommender systems

Sep 09, 2021
Athanasios N. Nikolakopoulos, Xia Ning, Christian Desrosiers, George Karypis

* 50 pages; Chapter in the Recommender Systems Handbook, 3rd Edition (to appear) 

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Projection techniques to update the truncated SVD of evolving matrices

Oct 13, 2020
Vassilis Kalantzis, Georgios Kollias, Shashanka Ubaru, Athanasios N. Nikolakopoulos, Lior Horesh, Kenneth L. Clarkson

* 13 pages 

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Random Surfing Revisited: Generalizing PageRank's Teleportation Model

Sep 01, 2020
Athanasios N. Nikolakopoulos

* 34 pages, 11 figures; Preliminary versions of (part of) this work have been presented as an ACM WSDM conference paper (, as well as in arXiv:1506.00092 (This article supersedes arXiv:1506.00092) v2: corrected numerical example 

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Adaptive Diffusions for Scalable Learning over Graphs

Sep 05, 2018
Dimitris Berberidis, Athanasios N. Nikolakopoulos, Georgios B. Giannakis

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Kernel-based Inference of Functions over Graphs

Apr 10, 2018
Vassilis N. Ioannidis, Meng Ma, Athanasios N. Nikolakopoulos, Georgios B. Giannakis, Daniel Romero

* To be published as a chapter in `Adaptive Learning Methods for Nonlinear System Modeling', Elsevier Publishing, Eds. D. Comminiello and J.C. Principe (2018). This chapter surveys recent work on kernel-based inference of functions over graphs including arXiv:1612.03615 and arXiv:1605.07174 and arXiv:1711.09306 

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Top-N recommendations in the presence of sparsity: An NCD-based approach

Jul 07, 2015
Athanasios N. Nikolakopoulos, John D. Garofalakis

* To appear in the Web Intelligence Journal as a regular paper 

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