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Andjela Mladenovic

andjela.mladenovic@mila.quebec
Doctorat - UdeM
Superviseur⋅e principal⋅e
Gauthier Gidel
Co-supervisor
Aaron Courville
Sujets de recherche
Théorie de l'apprentissage automatique
Site web
Google Scholar

Publications

Why Open Source? A Game-Theoretic Analysis of the AI Race
Andjela Mladenovic
Aaron Courville
Gauthier Gidel
In recent years, with the advancement of frontier AI, we have observed certain dynamics in open-sourcing and closed-sourcing decisions. We p… (voir plus)ropose a game-theoretic model to analyze these dynamics in the current landscape of the AI race. Our model builds on an R&D race framework under a winner-takes-all setting, and it accounts for the cases where the players' actions can be either discrete or continuous (i.e., partial open-sourcing, such as open weights). We show that determining the existence of a discrete pure non-trivial Nash equilibrium is NP-hard in general but that we can transform the discrete Nash existence computation into a MIP (Mixed-Integer Programming) problem, making it tractable for small instances using a standard MIP solver. Next, we show the existence and tractability of pure Nash equilibria in the continuous version of our problem, leveraging standard convex analysis results, and constructing an equivalent MIP formulation. Throughout this work, we leverage both our main technical results as well as surrounding technical analysis, to derive socially relevant insights that we believe can serve both to understand already existing decisions and dynamics and to potentially inform new policies.
2026-04-16
arXiv (prépublication)
doi.org
arxiv.org
A Persuasive Approach to Combating Misinformation
Safwan Hossain
Andjela Mladenovic
Yiling Chen
Gauthier Gidel
Bayesian Persuasion is proposed as a tool for social media platforms to combat the spread of misinformation. Since platforms can use machine… (voir plus) learning to predict the popularity and misinformation features of to-be-shared posts, and users are largely motivated to share popular content, platforms can strategically signal this informational advantage to change user beliefs and persuade them not to share misinformation. We characterize the optimal signaling scheme with imperfect predictions as a linear program and give sufficient and necessary conditions on the classifier to ensure optimal platform utility is non-decreasing and continuous. Next, this interaction is considered under a performative model, wherein platform intervention affects the user's future behaviour. The convergence and stability of optimal signaling under this performative process are fully characterized. Lastly, we experimentally validate that our approach significantly reduces misinformation in both the single round and performative setting and discuss the broader scope of using information design to combat misinformation.
2024-07-07
Proceedings of the 41st International Conference on Machine Learning (publié)
doi.org
proceedings.mlr.press
Generalized Natural Gradient Flows in Hidden Convex-Concave Games and Gans
Andjela Mladenovic
Iosif Sakos
Gauthier Gidel
Georgios Piliouras
2022-04-24
International Conference on Learning Representations (Accept (Poster))
openreview.net
openreview.net
Online Adversarial Attacks
Andjela Mladenovic
Avishek Joey Bose
Hugo Berard
William L. Hamilton
Simon Lacoste-Julien
Pascal Vincent
Gauthier Gidel
Adversarial attacks expose important vulnerabilities of deep learning models, yet little attention has been paid to settings where data arri… (voir plus)ves as a stream. In this paper, we formalize the online adversarial attack problem, emphasizing two key elements found in real-world use-cases: attackers must operate under partial knowledge of the target model, and the decisions made by the attacker are irrevocable since they operate on a transient data stream. We first rigorously analyze a deterministic variant of the online threat model by drawing parallels to the well-studied
2022-04-24
International Conference on Learning Representations (Accept (Poster))
doi.org
openreview.net