archimedes-Artificial Intelligence, Data Science, Algorithms-greece

 
Artificial Intelligence
 
Data Science
 
Algorithms

[Mechanism design theme invited talk] Sequential Choice and Self-Reinforcing Rankings

Dates
2025-03-05 14:50 - 16:00
Venue
Artemidos 1 - Amphitheater
TITLE: Sequential Choice and Self-Reinforcing Rankings

ABSTRACT: People’s behavior is informed and influenced by other people’s choices. In many online technologies, for instance, aggregate information about the choices of other individuals is encoded in the form of rankings. Such rankings, in turn, have a direct impact on people’s future choices. What are the long-term dynamics of these rankings, and do the dynamics depend on specific assumptions about people’s behavior? In this paper, we propose a general framework for modeling the dynamics in settings where information about peoples’ past choices is recorded as a ranking and influences future choices. We find a general condition for convergence, show that it is satisfied by many important models in economics and beyond, and characterize the possible limits in terms of the choice probabilities.

REFERENCE: https://www.researchgate.net/publication/358462939_Sequential_choice_and_self-reinforcing_rankings

SHORT BIO: Pantelis Pipergias Analytis (https://www.sdu.dk/en/forskning/forskningsenheder/samf/sod/simple-employee-list-sod/group-members/pantelis-analytis ) is an Associate Professor at the Department of Business and Management and senior fellow at the Danish Institute of Advanced Study. In his research, Pantelis develops mathematical and computational models of individual and collective behavior and uses experiments, big-data and large-scale simulations to assess their descriptive and prescriptive value. Pantelis has studied economics at the University of Athens, cognitive science at EHESS in Paris and received his PhD in psychology from Humboldt University in Berlin. Before joining the University of Southern Denmark, he worked as a predoctoral researcher at the Max Planck Institute for Human Development in Berlin and as a postdoctoral researcher at the Computer and Information Science departments at Cornell University in Ithaca. 

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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

 

ARCHIMEDES IMPACT

Research

Education

HIGHLIGHTS

Academy of Athens
Greek National AI Team selected through PDTN, the Panhellenic AI Competition, co-organized by Archimedes, Athena Research Center
ERC Grant: Christos Papadimitriou will lead the NEAGT project (starting 2026) on strategic interactions and computational decision-making, opening new directions for algorithmic game theory
Archimedes Talks: Michael I. Jordan (Inria Paris; UC Berkeley) on “Nonnegative Supermartingales, Sequential Testing, and Statistical Contract Theory”, 10 February 2026
Archimedes Talks: Paul Goldberg (University of Oxford) on “Complexity of Unambiguous Problems in Σ₂ᴾ”, 4 February 2026
ERC Grant: Christos Tzamos leads the COMFORMAL project (launched 2025) on rigorous foundations for robust and efficient machine learning algorithms
Archimedes Talks: Mark Girolami (The Alan Turing Institute; University of Cambridge) on “Statistical Finite Element Methods”, 7 November 2025
Archimedes Talks: Mihalis Yannakakis (Columbia University) on “Computing a Fixed Point of Contraction Maps in Polynomial Queries”, 25 June 2025

Highlights will be added soon.

 

NEWS

 
Archimedes at EMNLP 2026

Archimedes at EMNLP 2026

15 October 2026

Archimedes members will present seven papers at the Conference on Empirical Methods in Natural Language Processing (EMNLP 2026), one of the leading international conferences in natural language processing, taking place in Budapest, Hungary, from 24 to 29 October 2026: three papers in the Findings of EMNLP, one paper in the EMNLP Industry Track, and three papers at EMNLP workshops.

Θερινό Σχολείο Μηχανικής Μάθησης και Τεχνητής Νοημοσύνης 2026 για Μαθητές (GR/EN)

Θερινό Σχολείο Μηχανικής Μάθησης και Τεχνητής Νοημοσύνης 2026 για Μαθητές (GR/EN)

13 October 2026

Με μεγάλη χαρά ανακοινώνουμε ότι από τις 15 έως τις 19 Ιουνίου 2026, στη Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών του Εθνικού Μετσόβιου Πολυτεχνείου, θα πραγματοποιηθεί Θερινό Σχολείο Μηχανικής Μάθησης και Τεχνητής Νοημοσύνης για μαθητές Δευτεροβάθμιας Εκπαίδευσης (Γ΄ Γυμνασίου – Γ΄ Λυκείου), με διδάσκοντα τον Κωνσταντίνο Καραμανή. Το κείμενο είναι διαθέσιμο στα ελληνικά και στα αγγλικά (English version below).

Archimedes Leads EU-Funded AIRIS AI Project

Archimedes Leads EU-Funded AIRIS AI Project

13 October 2026

Archimedes leads a global partnership for trustworthy AI in biomedical research through the EU-funded project AIRIS AI, led by Christos Diou, affiliated member of Archimedes and Associate Professor at Harokopio University of Athens.

More news items here
 
 

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.

Greece 2.0 – Funded by the European Union – NextGenerationEU