greece
Algorithms
Data Science
Artificial Intelligence
Continuing our Archimedes Talks Series, on this Thursday at 13:00, Assistant Professor Nakos will be providing a speech on Near-Optimal Robust Sparse Matrix Multiplications, you are welcome to attend or to watch remotely through the teams link provided below.
Title: Near-Optimal Robust Sparse Matrix Multiplications
Abstract: We consider the robust version of the ubiquitous sparse matrix multiplication problem: given two matrices A,B with a and b non-zeros respectively, find the top k elements of their product AB. Recent work [Abboud, Bringmann, Fischer, Kunneman SODA 2024] has suggested a conditionally near-optimal algorithm when AB has at most k non-zero entries. However, as is usually the case, the product AB may not be sparse so we resort to the approximately finding the top k entries of AB. We will discuss a conditionally near-optimal algorithm for the problem which is even faster than the aforementioned algorithm of Abboud et.al.
Short Bio
Vasileios Nakos
Vasileios Nakos is an Assistant Professor at the Department of Informatics and Telecommunications National and Kapodistrian University of Athens. He previously has been a research scientist in the optimizer group of RelationalAI, as well as a postdoc in Max Planck Institute of Informatics and Saarland University. He received his Ph.D. from Harvard University and his undergraduate degree from National Technical University of Athens. Most of his work has concentrated on the field of linear sketching/ dimensionality reduction and the interdisciplinary field of sparse recovery, with focus on speeding up Machine Learning tasks, Optimization algorithms and Signal Processing routines.
Affiliation: National and Kapodistrian University of Athens- Archimedes Unit/Athena Research Center.
Microsoft Teams Need help?
Meeting ID: 338 633 988 76
Passcode: o5Zm5j
For organizers: Meeting options | Reset dial-in PIN
To position Greece as a leading player in AI and Data Science
To build an AI Excellence Hub in Greece where the international research community can connect, groundbreaking ideas can thrive, and the next generation of scientists emerges, shaping a brighter future for Greece and the world
Welcome to ARCHIMEDES, a vibrant research hub connecting the global AI and Data Science research community fostering groundbreaking research in Greece and beyond. Its dedicated core team, comprising lead researchers, affiliated researchers, Post-Docs, PhDs and interns, is committed to advancing basic and applied research in Artificial Intelligence and its supporting disciplines, including Algorithms, Statistics, Learning Theory, and Game Theory organized around 8 core research areas. By collaborating with Greek and Foreign Universities and Research Institutes, ARCHIMEDES disseminates its research findings fostering knowledge exchange and providing enriching opportunities for students. Leveraging AI to address real-world challenges, ARCHIMEDES promotes innovation within the Greek ecosystem and extends its societal impact. Established in January 2022, as a research unit of the Athena Research Center with support from the Committee Greece 2021, ARCHIMEDES is funded for its first four years by the EU Recovery and Resilience Facility (RRF).
The Archimedes Research Unit, part of the Athena Research Center, Greece, participated in this year's 89th Thessaloniki International Fair, which took place from September 6 to 14, 2025.
On Thursday, 11 September, 2025, from 11:00 am to 12:30 pm, at the Archimedes Amphitheatre (1 Artemidos Street, 15125, Marousi, Archimedes, Athena Research Center, Greece), Professor Elias Koutsoupias of the University of Oxford, UK, will deliver a talk on "The Communication Complexity of Combinatorial Auctions in Graphs."
A new paper co-authored by John Pavlopoulos from Archimedes Research Unit at the Athena Research Center, Kanella K. Pouliand Maria Gavriilidou from the Institute for Language and Speech Processing (ILSP) at the Athena Research Center, and Juli Bakagianni from the Department of Informatics of the Athens University of Economics & Business (AUEB) has been accepted for publication at Patterns journal.
Upcoming workshop on Dialect NLP on “Standardization and Variation for Dialect Varieties with Universal Dependencies as an Application Framework” coming up. We are excited to announce that the Dialect NLP team at Archimedes, Athena Research Center, Greece, is organizing a workshop in collaboration with the MaiNLP Research Lab at Ludwig Maximilian University (LMU) of Munich.
The Archimedes Unit of the Athena Research Center, Greece is pleased to announce a new series of experientialworkshops on Artificial Intelligence (AI) and Natural Language, focusing on their contribution to and interaction with linguistic sciences.
The project “ARCHIMEDES Unit: Research in Artificial Intelligence, Data Science and Algorithms” with code OPS 5154714 is implemented by the National Recovery and Resilience Plan “Greece 2.0” and is funded by the European Union – NextGenerationEU.
Stay connected! Subscribe to our mailing list by emailing sympa@lists.athenarc.gr
with the subject "subscribe archimedes-news Firstname LastName"
(replace with your details)
