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Change Point Detection and Meta-Bandits for Online Learning in Dynamic Environments

Cédric Hartland 1, 2 Nicolas Baskiotis 1, 2 Sylvain Gelly 1, 2 Michèle Sebag 1, 2 Olivier Teytaud 1, 2
1 TANC - Algorithmic number theory for cryptology
Inria Saclay - Ile de France, LIX - Laboratoire d'informatique de l'École polytechnique [Palaiseau]
Abstract : Motivated by realtime website optimization, this paper is about online learning in abruptly changing environments. Two extensions of the UCBT algorithm are combined in order to handle dynamic multi-armed bandits, and specifically to cope with fast variations in the rewards. Firstly, a change point detection test based on Page-Hinkley statistics is used to overcome the limitations due to the UCBT inertia. Secondly, a controlled forgetting strategy dubbed Meta-Bandit is proposed to take care of the Exploration vs Exploitation trade-off when the PH test is triggered. Extensive empirical validation shows significant improvements compared to the baseline algorithms. The paper also investigates the sensitivity of the proposed algorithm with respect to the number of available options.
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Submitted on : Monday, November 5, 2007 - 10:18:05 AM
Last modification on : Friday, February 4, 2022 - 3:30:11 AM
Long-term archiving on: : Monday, September 24, 2012 - 11:15:50 AM


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  • HAL Id : inria-00164033, version 1


Cédric Hartland, Nicolas Baskiotis, Sylvain Gelly, Michèle Sebag, Olivier Teytaud. Change Point Detection and Meta-Bandits for Online Learning in Dynamic Environments. CAp 2007 : 9è Conférence francophone sur l'apprentissage automatique, Jul 2007, Grenoble, France. pp.237-250. ⟨inria-00164033⟩



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