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Our Keynote Speakers

Keynote Speaker #1

Keynote Speaker #2

Title:
Scaling Actionable Recourse from Local to Global Counterfactuals
Speaker:
Prof. Dimitrios Gunopoulos
Date / Time:
Thursday, October 22st, 2026 / 9.00-10.00
Place:
NTUA Central Library, Multimedia Center
 
Abstract
Using Artificial Intelligence in critical decision-making applications introduces deep risks regarding transparency, fairness, and accountability. We know that embedded biases in commonly used training data often distribute predictive errors unevenly across individuals and subgroups — a problem severely compounded by the opacity of modern AI pipelines. Explainability methods, particularly counterfactual explanations, offer a robust framework to understand these fairness implications. Succinctly, a counterfactual explanation encodes a minimal set of input modifications required to alter a model’s prediction. It thus provides a reliable mechanism to compare instances and evaluate equitable outcomes. Here we present novel techniques for deriving local counterfactual explanations by optimizing for feasibility, simplicity, and compactness. Furthermore, to mitigate the scalability limitations of instance-level algorithms, we extend our scope to consider global counterfactual frameworks. Our methods synthesize succinct, actionable recourse strategies that deliver scalable insights applicable across large population subgroups.
 
Title:
Managing Non-Monotonicity & Uncertainty in Inference and Decision Making
Speaker:
Ass. Prof. Florence Bannay
Date / Time:
Friday, October 23st, 2026 / 9.00-10.00
Place:
NTUA Central Library, Multimedia Center

Abstract
This presentation explores the use of default rules to reason in dierent contexts. Indeed, three factors may complicate reasoning: the temporal dimension (states of the world change over time), incomplete data (a lack of factual information), and a lack of understanding of the underlying generic (or even causal) laws. When faced with this uncertainty, an intelligent agent adapts its knowledge as new observations become available, or carries out a comprehensive retrospective review based on a complete sequence. To make decisions, the Bipolar Layered Framework uses default rules to express pros and cons arguments, with conclusions graded by their importance. By making the implicit defeasible knowledge and the uncertainties associated with it explicit, the aim of developing such automated systems is not only to ensure their veriability, but also to help people rene their understanding and critical thinking skills when faced with information.

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