The paper derives a closed-form importance weight for subpopulation shift, but the main formula contradicts the text and seems to mis-weight minority samples, and the claimed SOTA worst-group performance does not hold on CivilComments.
In Companion proceedings of the 2019 world wide web conference, 491–500
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Boosting Test Performance with Importance Sampling--a Subpopulation Perspective
The paper derives a closed-form importance weight for subpopulation shift, but the main formula contradicts the text and seems to mis-weight minority samples, and the claimed SOTA worst-group performance does not hold on CivilComments.