Under covariate shift, with outcomes only in the source domain, the paper derives a doubly robust semiparametric efficient estimator of the target reward and uses it to learn a treatment policy.
Causal inference methods for combin- ing randomized trials and observational studies: a review
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Optimal Policy Adaptation under Covariate Shift
Under covariate shift, with outcomes only in the source domain, the paper derives a doubly robust semiparametric efficient estimator of the target reward and uses it to learn a treatment policy.