arXiv AI By Pallavi Mitra, Jai Kushwaha, Felix Biessmann

Accuracy and Robustness of Model Cascades Under Data Perturbations

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The paper investigates how confidence‑based model cascades, which route easy inputs to lightweight models and defer difficult cases to larger ones, behave under data perturbations. It shows that static corruptions can either break the routing signal or degrade both models, while sequential perturbations cause predictions to stabilize but deferral to fail, revealing three distinct failure modes. The study highlights that energy‑efficient cascades must be evaluated not only on clean accuracy but also on routing reliability when the input distribution shifts.

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