Hédi Hadiji

activity

20182026

most citedKL-UCB-switch: optimal regret bounds for stochastic bandits from both a distribution-dependent and a distribution-free viewpoints

12 citations · 23 across the 15 of their papers we have counts for

collaborators

Showing 2025 · stat.MLShow all

2 papers · 2 filters

stat.ML2025

Tractable Instances of Bilinear Maximization: Implementing LinUCB on Ellipsoids

Raymond Zhang, Hédi Hadiji, Richard Combes

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

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…