Forskning ved Københavns Universitet - Københavns Universitet

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Boosting learning to rank with user dynamics and continuation methods

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Learning to rank (LtR) techniques leverage assessed samples of query-document relevance to learn effective ranking functions able to exploit the noisy signals hidden in the features used to represent queries and documents. In this paper we explore how to enhance the state-of-the-art LambdaMart LtR algorithm by integrating in the training process an explicit knowledge of the underlying user-interaction model and the possibility of targeting different objective functions that can effectively drive the algorithm towards promising areas of the search space. We enrich the iterative process followed by the learning algorithm in two ways: (1) by considering complex query-based user dynamics instead than simply discounting the gain by the rank position; (2) by designing a learning path across different loss functions that can capture different signals in the training data. Our extensive experiments, conducted on publicly available datasets, show that the proposed solution permits to improve various ranking quality measures by statistically significant margins.

OriginalsprogEngelsk
TidsskriftInformation Retrieval Journal
Antal sider27
ISSN1386-4564
DOI
StatusE-pub ahead of print - 2020

ID: 230562117