AI RESEARCH
When Does Trimming Help Conformal Prediction? A Retained-Law Diagnostic under Calibration Contamination
arXiv CS.LG
•
ArXi:2605.06204v1 Announce Type: cross Trimming suspicious calibration points is a common response to contamination in conformal prediction. Its effect on clean-target coverage, however, is governed by the retained law induced by trimming, not by the contamination level alone. We analyse fixed-threshold trimming as conditioning rather than purification. It replaces the contaminated calibration law with a retained law, reducing clean-target coverage to a one-dimensional score-CDF transfer problem with an exact finite-sample identity.