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).

 
 

NEWS

 
First Call for Papers of the Workshop on Dialects in NLP (LREC 2026)

First Call for Papers of the Workshop on Dialects in NLP (LREC 2026)

First call for papers for the "Workshop on Dialects in NLP: A Resource Perspective" at the three-day Language Resources Association Conference (LREC) 2026. This workshopwill be held in conjunction with LREC 2026, Palma de Mallorca, Spain on 11, 12 and 16 May 2026. It is a hybrid event and attendance can be in person or online. 

Participation is Open for the 2026 ELLIS Winter School

Participation is Open for the 2026 ELLIS Winter School

Archimedes Unit of the Athena Research Center, Greece, encourages participation in the "ELLIS Winter School 2026: AI for Earth System, Hazards, and Climate Extremes", taking place on March 16-20, 2026, at the National Technical University of Athens, Greece.

Merry Christmas!

Merry Christmas!

🌟 The Archimedes Community of the Athena Research Center, Greece, would like to wish everyone a Merry Christmas and a holiday season filled with happiness, gratitude, and good health. ✨

Archimedes Postdoc Vassilis Alimisis Will Conduct a Tutorial at ICM 2025

Archimedes Postdoc Vassilis Alimisis Will Conduct a Tutorial at ICM 2025

Vassilis Alimisis, a Postdoc at the Archimedes Unit of the Athena Research Center in Greece, a Collaborating Researcher at the School of Electrical and Computer Engineering at the National Technical University of Athens in Greece, an Adjunct Lecturer at the Department of Digital Industry Technologies at the National and Kapodistrian University of Athens in Greece, and a National Postdoctoral Research Fellow of the Bodossaki Foundation, Athens, Greece, will deliver a tutorial at the 2025 International Conference on Microelectronics (ICM), which will take place on 14-17 December 2025, in Cairo, Egypt.

Applications for the Greek Olympiad in Artificial Intelligence for Middle and High School Students are Now Open!

Applications for the Greek Olympiad in Artificial Intelligence for Middle and High School Students are Now Open!

The Preliminary Phase "Talos" of the Greek Olympiad in Artificial Intelligence (PDTN) is now open for online participation. This competition for middle and high school students will run from December 1, 2025 until March 1, 2026, and students will be asked to solve four problems: one on Decision Trees (Δεντρα Αποφασης), one on CAPTCHA Challenges (Επίλυση CAPTCHA), one for Emotion Classification (Συναισθηματα), and one on Movie Recommendation Systems (Επόμενη Ταινία).

 
 

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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