Early stopping and non-parametric regression: An optimal data-dependent stopping rule
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Abstract (arXiv)
The strategy of early stopping is a regularization technique based on choosing a stopping time for an iterative algorithm. Focusing on non-parametric regression in a reproducing kernel Hilbert space, we analyze the early stopping strategy for a form of gradient-descent applied to the least-squares loss function. We propose a data-dependent stopping rule that does not involve hold-out or cross-validation data, and we prove upper bounds on the squared error of the resulting function estimate, measured in either the L2(P) and L2(Pn) norm. These upper bounds lead to minimax-optimal rates for various kernel classes, including Sobolev smoothness classes and other forms of reproducing kernel Hilbert spaces. We show through simulation that our stopping rule compares favorably to two other stopping rules, one based on hold-out data and the other based on Stein's unbiased risk estimate. We also establish a tight connection between our early stopping strategy and the solution path of a kernel ridge regression estimator.
Key facts. Cited by 86 papers in the map (data through 7 Oct 2026). First posted on arXiv 15 Jun 2013.
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Citing papers per year: 2021: 12; 2022: 14; 2023: 17; 2024: 14; 2025: 13; 2026: 16.
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