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Counterfactual Learning with General Data-generating Policies

2022-12-04 21:07:46
Yusuke Narita, Kyohei Okumura, Akihiro Shimizu, Kohei Yata

Abstract

Off-policy evaluation (OPE) attempts to predict the performance of counterfactual policies using log data from a different policy. We extend its applicability by developing an OPE method for a class of both full support and deficient support logging policies in contextual-bandit settings. This class includes deterministic bandit (such as Upper Confidence Bound) as well as deterministic decision-making based on supervised and unsupervised learning. We prove that our method's prediction converges in probability to the true performance of a counterfactual policy as the sample size increases. We validate our method with experiments on partly and entirely deterministic logging policies. Finally, we apply it to evaluate coupon targeting policies by a major online platform and show how to improve the existing policy.

Abstract (translated)

URL

https://arxiv.org/abs/2212.01925

PDF

https://arxiv.org/pdf/2212.01925.pdf


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