Taking the Counterfactual Online: Efficient and Unbiased Online Evaluation for Ranking

24 Jul 2020 Harrie Oosterhuis Maarten de Rijke

Counterfactual evaluation can estimate Click-Through-Rate (CTR) differences between ranking systems based on historical interaction data, while mitigating the effect of position bias and item-selection bias. We introduce the novel Logging-Policy Optimization Algorithm (LogOpt), which optimizes the policy for logging data so that the counterfactual estimate has minimal variance... (read more)

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