Non-separable Spatio-temporal Graph Kernels via SPDEs

• URL: http://arxiv.org/abs/2111.08524v1
• Date: Tue, 16 Nov 2021 14:53:19 GMT
• Title: Non-separable Spatio-temporal Graph Kernels via SPDEs
• Authors: Alexander Nikitin, ST John, Arno Solin, Samuel Kaski
• Abstract summary: We provide graph kernels for principled-temporal modelling on graphs. By providing novel tools for modelling on graphs, we outperform pre-existing graph kernels in real-world applications.
• Score: 90.62347738138594
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Gaussian processes (GPs) provide a principled and direct approach for inference and learning on graphs. However, the lack of justified graph kernels for spatio-temporal modelling has held back their use in graph problems. We leverage an explicit link between stochastic partial differential equations (SPDEs) and GPs on graphs, and derive non-separable spatio-temporal graph kernels that capture interaction across space and time. We formulate the graph kernels for the stochastic heat equation and wave equation. We show that by providing novel tools for spatio-temporal GP modelling on graphs, we outperform pre-existing graph kernels in real-world applications that feature diffusion, oscillation, and other complicated interactions.

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