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  • EdwardsLeslieJORS_accepted

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    Accepted author manuscript, 789 KB, PDF document

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    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

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Selecting Multiple Web Adverts - a Contextual Multi-armed Bandit with State Uncertainty

Research output: Contribution to journalJournal article

E-pub ahead of print
<mark>Journal publication date</mark>20/02/2019
<mark>Journal</mark>Journal of the Operational Research Society
Publication statusE-pub ahead of print
Early online date20/02/19
Original languageEnglish

Abstract

We present a method to solve the problem of choosing a set of adverts to display to each of a sequence of web users. The objective is to maximise user clicks over time and to do so we must learn about the quality of each advert in an online manner by observing user clicks. We formulate the problem as a novel variant of a contextual combinatorial multi-armed bandit problem. The context takes the form of a probability distribution over the user's latent topic preference, and rewards are a particular nonlinear function of the selected set and the context. These features ensure that optimal sets of adverts are appropriately diverse. We give a flexible solution method which combines submodular optimisation with existing bandit index policies. User state uncertainty creates ambiguity in interpreting user feedback which prohibits exact Bayesian updating, but we give an approximate method that is shown to work well.