Hédi Hadiji

activity

20242026

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3 papers · 1 filter

stat.ML2025

Tractable Instances of Bilinear Maximization: Implementing LinUCB on Ellipsoids

Raymond Zhang, HÃ©di Hadiji, Richard Combes

We consider the maximization of $x^{⊤} I^¸$ over $(x, I^¸) \in X \times I^$ , with $X \subset R^{d}$ convex and $I^ \subset R^{d}$ an ellipsoid. This…

stat.ML2025

Linear Bandits on Ellipsoids: Minimax Optimal Algorithms

Raymond Zhang, Hedi Hadiji, Richard Combes

We consider linear stochastic bandits where the set of actions is an ellipsoid. We provide the first known minimax optimal algorithm for this problem. We first derive a novel infor…

stat.ML2024

Diversity-Preserving K-Armed Bandits, Revisited

We consider the bandit-based framework for diversity-preserving recommendations introduced by Celis et al. (2019), who approached it in the case of a polytope mainly by a reduction…