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Revisiting Neural Processes via Fourier Transform and Volterra Series
[Submitted on 31 May 2026 (v1), last revised 13 Jul 2026 (this v · 2026-05-31 · via cs.LG updates on arXiv.org

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Abstract:Modeling unknown latent functions from finite, irregularly sampled measurements is a recurring challenge across science and engineering. Neural processes (NPs), a family of probabilistic functional models, are promising solutions -- especially when endowed with domain-specific symmetries like translation equivariance, which improve sample efficiency and generalization. Yet existing translation-equivariant NPs face two limitations: (i) they stack generic components with non-linearities, obscuring the induced function class and limiting interpretability; and (ii) convolutional designs are limited by local receptive fields and the need to embed inputs onto a dense uniform grid, while attention-based alternatives lift these restrictions at quadratic cost in the number of observations. We address both with two contributions. First, using the Volterra expansion, we approximate continuous translation-equivariant operators by sums of higher-order convolutions, yielding analytical transparency while admitting efficient evaluation via first-order convolutions. Second, we introduce set Fourier convolutions (SFConvs), a frequency-domain parameterization that operates directly on irregularly sampled points, achieves approximately global receptive fields, and scales linearly in the number of observations. Building on these ideas, we propose two conditional NPs (CNPs): SFConvCNPs, which stack SFConv blocks with non-linearities, and SFVConvCNPs, which integrate the Volterra formulation. Experiments on synthetic and real-world datasets demonstrate our methods' efficacy against state-of-the-art baselines.

Submission history

From: Peiman Mohseni [view email]
[v1] Sun, 31 May 2026 11:27:48 UTC (2,002 KB)
[v2] Thu, 11 Jun 2026 06:17:49 UTC (1,993 KB)
[v3] Mon, 13 Jul 2026 05:09:46 UTC (1,997 KB)

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