Generalized Team Draft Interleaving

Kharitonov, E., Macdonald, C. , Serdyukov, P. and Ounis, I. (2015) Generalized Team Draft Interleaving. In: CIKM 2015: 24th ACM International Conference on Information and Knowledge Management, Melbourne, Australia, 19-23 Oct 2015,

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Abstract

Interleaving is an online evaluation method that compares two ranking functions by mixing their results and interpret- ing the users' click feedback. An important property of an interleaving method is its sensitivity, i.e. the ability to obtain reliable comparison outcomes with few user interac- tions. Several methods have been proposed so far to im- prove interleaving sensitivity, which can be roughly divided into two areas: (a) methods that optimize the credit assign- ment function (how the click feedback is interpreted), and (b) methods that achieve higher sensitivity by controlling the interleaving policy (how often a particular interleaved result page is shown). In this paper, we propose an interleaving framework that generalizes the previously studied interleaving methods in two aspects. First, it achieves a higher sensitivity by per- forming a joint data-driven optimization of the credit as- signment function and the interleaving policy. Second, we formulate the framework to be general w.r.t. the search do- main where the interleaving experiment is deployed, so that it can be applied in domains with grid-based presentation, such as image search. In order to simplify the optimization, we additionally introduce a stratifed estimate of the exper- iment outcome. This stratifcation is also useful on its own, as it reduces the variance of the outcome and thus increases the interleaving sensitivity. We perform an extensive experimental study using large- scale document and image search datasets obtained from a commercial search engine. The experiments show that our proposed framework achieves marked improvements in sensitivity over efective baselines on both datasets.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ounis, Professor Iadh and Macdonald, Dr Craig
Authors: Kharitonov, E., Macdonald, C., Serdyukov, P., and Ounis, I.
College/School:College of Science and Engineering > School of Computing Science
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