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Harrie Oosterhuis (until recently a PhD student at the Informatics Institute , now an assistant professor at Radboud University Nijmegen) and Maarten de Rijke received the best paper award at the 14th ACM International Conference on Web Search and Data Mining (WSDM 2021) for their paper Unifying Online and Counterfactual Learning to Rank.

The paper proposes a novel intervention-aware estimator for both counterfactual and online learning to rank. The estimator corrects for the effect of position bias, trust bias, and item-selection bias by using corrections based on the behavior of the logging policy and on online interventions.