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News/What Changed? Drift Detection with Real, Virtual, and Incomparable Diagnosis
arxiv
PublishedSeptember 24, 2026 at 4:00 AM

What Changed? Drift Detection with Real, Virtual, and Incomparable Diagnosis

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arXiv:2609.27865v1 Announce Type: cross Abstract: Sharing a deep encoder does not, by itself, fix the central confound of task-comparison scores. We show that cross-evaluated heads on a frozen shared representation inherit the extrapolation confound of shallow exchange scores: pure input rotations w

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