archimedes-Artificial Intelligence, Data Science, Algorithms-greece

 
Artificial Intelligence
 
Data Science
 
Algorithms

[Archimedes Talks] Sampling from high-dimensional constrained distributions

Dates
2025-03-31 12:00 - 14:00
Venue
Artemidos 1 - Amphitheater
Title: Sampling from high-dimensional constrained distributions

Speaker: Dr. Vissarion Fisikopoulos (Senior software engineer at Oracle and Coordinator of the GeomScale project)

Abstract: Sampling from a given probability distribution constrained by a convex
space is a fundamental problem that arises across various fields, from
optimization to quantitative finance and systems biology. These problems
are critical for modeling uncertainty, making decisions under
constraints, and understanding complex systems. However, designing
efficient sampling algorithms in high-dimensional spaces remains a
significant challenge.

In this talk, we will introduce the relevant theoretical background,
define the main problems, and delve into the core challenges associated
with sampling in constrained spaces. We will explore how these
challenges manifest in practical applications, briefly touching on real
world examples from biology and finance. Furthermore, we will outline
the current state-of-the-art methods available for some important
constraint models, focusing on their computational efficiency,
scalability, and accuracy.

From a practical viewpoint, we will demonstrate the implementation of
these methods in open-source software, providing hands-on insights into
their implementation and applicability. The discussed software is
publicly available at \url{https://github.com/GeomScale}, enabling
researchers and practitioners to integrate these advanced sampling
techniques into their workflows.


Short Bio: Previously, he was a postdoc researcher at Algorithms Research Group in Université libre de Bruxelles (ULB) working with Prof. Samuel Fiorini. Before that he was a visiting researcher at National Institute for Mathematical Sciences in South Korea and researcher at the University of Athens.
He holds a Phd in Computer Science, from University of Athens supervised by Prof. Ioannis Emiris. Also, a M.Sc. in Logic, Algorithms and Computation, from University of Athens. His diploma (5-year degree) is in Computer Engineering & Computer Science from CEID, University of Patras.

You can attend online via MS-Teams by clicking the following link 


 
 

Vision

To position Greece as a leading player in AI and Data Science

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Mission

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).

 
 

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On Tuesday 4 November, 2025, from 1:00 pm to 2:00 pm, at the Archimedes Amphitheatre (1 Artemidos Street, 15125, Marousi, Archimedes, Athena Research Center, Greece), Professor Alexandra Meliou, Professor at the College of Information and Computer Sciences at the University of Massachusetts Amherst, USA, and a visiting researcher at the Archimedes Research Center, Athena Research Center, Greece, will deliver an Archimedes talk on "Data Analysis and Manipulation through a Constrained Optimization Lens."

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On Tuesday 21 October, 2025, from 1:00 pm to 2:00 pm, at the Archimedes Amphitheatre (1 Artemidos Street, 15125, Marousi, Archimedes, Athena Research Center, Greece), Professor Manos Athanassoulis, Associate Professor of Computer Science at Boston University (BU), USA, Director and Founder of the BU Data-intensive Systems and Computing Laboratory, BU, USA, and Co-Director of the BU Massive Data Algorithms and Systems Group, BU, USA, will deliver an Archimedes talk on "Harnessing the Untapped Benefits of Near-Sortedness for Data Systems."

GameSec 2025 just Around the Corner!

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The 16th Conference on Game Theory and AI for Security (GameSec25), an event strongly supported by Archimedes, Athena Research Center, Greece will take place at the National Technical University of Athens, Greece from October 13-15 2025. "With the rapid advancement of artificial intelligence, game theory, and security technologies, the resilience and trustworthiness of modern systems is more critical than ever. The 2025 Conference on Game Theory and AI for Security focuses on leveraging strategic decision-making, adversarial reasoning, and computational intelligence to address security challenges in complex and dynamic environments.

11 Papers Accepted at NeurIPS 2025!

11 Papers Accepted at NeurIPS 2025!

We are happy to announce that 11 papers from Archimedes, Athena Research Center, Greece, have been accepted at the Thirty-Ninth Annual Conference on Neural Information Processing Systems (NeurIPS 2025)!NeurIPS is a major annual event in the artificial intelligence and machine learning community and this year it will take place from December 2 to December 7 at the San Diego Convention Center, California, USA.

 
 

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.

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