A three-stage estimator recovers target label proportions and the known-data fraction under open set label shift, and corrects a frozen classifier to the target without retraining.
On- line label shift: Optimal dynamic regret meets practical algo- rithms
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Open Set Label Shift with Test Time Out-of-Distribution Reference
A three-stage estimator recovers target label proportions and the known-data fraction under open set label shift, and corrects a frozen classifier to the target without retraining.