Online Stochastic Optimization under Correlated Bandit Feedback

Gheshlaghi Azar, Mohammad; Lazaric, Alessandro; Brunskill, Emma

Document type :

Communication dans un congrès avec actes

Title :

Online Stochastic Optimization under Correlated Bandit Feedback

Author(s) :

Gheshlaghi Azar, Mohammad [Auteur]
Northwestern University [Evanston]
Lazaric, Alessandro [Auteur]
Sequential Learning [SEQUEL]
Brunskill, Emma [Auteur]
Computer Science Department - Carnegie Mellon University

Conference title :

31st International Conference on Machine Learning

City :

Beijing

Country :

Chine

Start date of the conference :

2014-06

HAL domain(s) :

Statistiques [stat]/Machine Learning [stat.ML]

English abstract : [en]

In this paper we consider the problem of online stochastic optimization of a locally smooth func-tion under bandit feedback. We introduce the high-confidence tree (HCT) algorithm, a novel anytime X -armed bandit algorithm, ...
Show more >In this paper we consider the problem of online stochastic optimization of a locally smooth func-tion under bandit feedback. We introduce the high-confidence tree (HCT) algorithm, a novel anytime X -armed bandit algorithm, and derive regret bounds matching the performance of state-of-the-art algorithms in terms of the dependency on number of steps and the near-optimality di-mension. The main advantage of HCT is that it handles the challenging case of correlated ban-dit feedback (reward), whereas existing meth-ods require rewards to be conditionally indepen-dent. HCT also improves on the state-of-the-art in terms of the memory requirement, as well as requiring a weaker smoothness assumption on the mean-reward function in comparison with the existing anytime algorithms. Finally, we discuss how HCT can be applied to the problem of policy search in reinforcement learning and we report preliminary empirical results.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

European Project :

Composing Learning for Artificial Cognitive Systems

Collections :