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Subsampling for supervised learning in reproducing kernel...
[Submitted on 19 Jun 2026] · 2026-06-23 · via stat updates on arXiv.org

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Abstract:In the era of big data, subsampling became a common practice in statistical learning. By selecting a subgroup of individuals based on which the learner is trained, subsampling aims at reducing the computational cost and time of the estimation step, and ideally leads to a decrease of its energy consumption and carbon footprint. This work focuses on a nonparametric setting, in which the hypotheses set lies in a reproducing kernel Hilbert space, and the estimator is a minimizer of an empirical risk reweighted à la Horvitz-Thompson. By studying the asymptotic properties of this estimator, we reveal an optimal subsampling scheme (regarding the trace of the covariance operator) and show that it can be used via plug-in. A numerical study on synthetic and real-world datasets shows the practicability and the benefit of the proposed approach.

Submission history

From: Maxime Sangnier [view email]
[v1] Fri, 19 Jun 2026 09:36:10 UTC (3,648 KB)