Norm-matched zeroth-order adaptation preserves the isotropic retention floor while contracting only the anisotropic component, producing a quadratic forgetting gap that favors ZO precisely when the first-order direction has above-average retention curvature.
Revisiting class- incremental learning with pre-trained models: Generalizability and adaptivity are all you need
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Why Zeroth-Order Adaptation May Forget Less: A Randomized Shaping Theory
Norm-matched zeroth-order adaptation preserves the isotropic retention floor while contracting only the anisotropic component, producing a quadratic forgetting gap that favors ZO precisely when the first-order direction has above-average retention curvature.