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ASYMPTOTICALLY OPTIMAL MULTI-ARMED BANDIT POLICIES UNDER A COST CONSTRAINT

Published online by Cambridge University Press:  05 October 2016

Apostolos Burnetas
Affiliation:
Department of Mathematics, University of Athens, Athens, Greece E-mail: aburnetas@math.uoa.gr
Odysseas Kanavetas
Affiliation:
Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey E-mail: okanavetas@sabanciuniv.edu
Michael N. Katehakis
Affiliation:
Department of Management Science and Information Systems, Rutgers University, NJ, USA E-mail: mnk@rutgers.edu
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Abstract

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We consider the multi-armed bandit problem under a cost constraint. Successive samples from each population are i.i.d. with unknown distribution and each sample incurs a known population-dependent cost. The objective is to design an adaptive sampling policy to maximize the expected sum of n samples such that the average cost does not exceed a given bound sample-path wise. We establish an asymptotic lower bound for the regret of feasible uniformly fast convergent policies, and construct a class of policies, which achieve the bound. We also provide their explicit form under Normal distributions with unknown means and known variances.

Information

Type
Research Article
Copyright
Copyright © Cambridge University Press 2016