Encrypted Linear Contextual Bandit - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Encrypted Linear Contextual Bandit

Résumé

Contextual bandit is a general framework for online learning in sequential decision-making problems that has found application in a wide range of domains, including recommendation systems, online advertising, and clinical trials. A critical aspect of bandit methods is that they require to observe the contexts --i.e., individual or group-level data-- and rewards in order to solve the sequential problem. The large deployment in industrial applications has increased interest in methods that preserve the users' privacy. In this paper, we introduce a privacy-preserving bandit framework based on homomorphic encryption{\color{violet} which allows computations using encrypted data}. The algorithm \textit{only} observes encrypted information (contexts and rewards) and has no ability to decrypt it. Leveraging the properties of homomorphic encryption, we show that despite the complexity of the setting, it is possible to solve linear contextual bandits over encrypted data with a $\widetilde{O}(d\sqrt{T})$ regret bound in any linear contextual bandit problem, while keeping data encrypted.

Dates et versions

hal-03951440 , version 1 (23-01-2023)

Identifiants

Citer

Evrard Garcelon, Vianney Perchet, Matteo Pirotta. Encrypted Linear Contextual Bandit. AISTATS 2022 - 25th International Conference on Artificial Intelligence and Statistics, Mar 2022, Valence, Spain. ⟨hal-03951440⟩
17 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More