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Population Risk Bounds for Kolmogorov-Arnold Networks Trained by DP-SGD with Correlated Noise

Summary

Researchers establish the first population risk bounds for Kolmogorov-Arnold Networks (KANs) trained with mini-batch SGD and gradient clipping, covering both non-private and differentially private SGD with correlated Gaussian noise. The work introduces a novel analysis route for correlated-noise DP training in non-convex settings, achieving sharper bounds than prior work.

SourcearXiv Machine LearningAuthor: Puyu Wang, Jan Schuchardt, Nikita Kalinin, Junyu Zhou, Sophie Fellenz, Christoph Lampert, Marius Kloft
Population Risk Bounds for Kolmogorov-Arnold Networks Trained by DP-SGD with Correlated Noise
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[2605.12648] Population Risk Bounds for Kolmogorov-Arnold Networks Trained by DP-SGD with Correlated Noise

[Submitted on 12 May 2026]

Title:Population Risk Bounds for Kolmogorov-Arnold Networks Trained by DP-SGD with Correlated Noise

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Abstract:We establish the first population risk bounds for Kolmogorov-Arnold Networks (KANs) trained by mini-batch SGD with gradient clipping, covering non-private SGD as well as differentially private SGD (DP-SGD) with Gaussian perturbations that interpolate between independent and temporally correlated noise. This setting is substantially closer to practice than prior KAN theory along two axes: training is by mini-batch SGD, the standard recipe for modern networks, rather than full-batch gradient descent (GD); and correlated-noise mechanisms have empirically shown a more favorable privacy-utility tradeoff than independent-noise mechanisms. Our results cover the corresponding full-batch GD and independent-noise DP-GD results for KANs by Wang et al. (2026), while yielding sharper fixed-second-layer specializations. The technical core is a new analysis route for correlated-noise DP training in the non-convex regime. Temporal dependence breaks the conditional-centering structure underlying standard one-step SGD arguments, and the projection step obstructs the exact cancellation structure of correlated perturbations. We address these difficulties through an auxiliary unprojected dynamics, a shifted iterate that absorbs the current noise perturbation, and a high-probability bootstrap certifying projection inactivity. Combining this optimization analysis with a stability-based generalization argument yields the stated population risk bounds. To the best of our knowledge, this is the first optimization and population risk analysis of a correlated-noise mechanism for DP training beyond convex learning, in particular for neural networks.

Subjects:

Machine Learning (cs.LG); Machine Learning (stat.ML)

Cite as: arXiv:2605.12648 [cs.LG]

(or arXiv:2605.12648v1 [cs.LG] for this version)

https://doi.org/10.48550/arXiv.2605.12648

arXiv-issued DOI via DataCite (pending registration)

Submission history

From: Puyu Wang [view email] [v1] Tue, 12 May 2026 18:44:47 UTC (146 KB)

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Key points and analysis

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Key points

  • First population risk bounds for KANs under mini-batch SGD with correlated noise.
  • Covers both non-private SGD and DP-SGD with independent and correlated Gaussian perturbations.
  • New technical approach handles temporal dependence and projection step issues in non-convex DP training.
  • Demonstrates more favorable privacy-utility tradeoff for correlated noise mechanisms.

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