Simplifying Graph Kernels for Efficient

• URL: http://arxiv.org/abs/2507.03560v2
• Date: Wed, 16 Jul 2025 07:00:43 GMT
• Title: Simplifying Graph Kernels for Efficient
• Authors: Lin Wang, Shijie Wang, Sirui Huang, Qing Li,
• Abstract summary: We introduce a new perspective by designing the simplified graph kernel.<n>It replaces deep layer stacking with a streamlined $K$-step message aggregation process.<n>A second kernel draws from Gaussian Process theory to model infinite-width GNNs.
• Score: 17.940972681488123
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: While kernel methods and Graph Neural Networks offer complementary strengths, integrating the two has posed challenges in efficiency and scalability. The Graph Neural Tangent Kernel provides a theoretical bridge by interpreting GNNs through the lens of neural tangent kernels. However, its reliance on deep, stacked layers introduces repeated computations that hinder performance. In this work, we introduce a new perspective by designing the simplified graph kernel, which replaces deep layer stacking with a streamlined $K$-step message aggregation process. This formulation avoids iterative layer-wise propagation altogether, leading to a more concise and computationally efficient framework without sacrificing the expressive power needed for graph tasks. Beyond this simplification, we propose another Simplified Graph Kernel, which draws from Gaussian Process theory to model infinite-width GNNs. Rather than simulating network depth, this kernel analytically computes kernel values based on the statistical behavior of nonlinear activations in the infinite limit. This eliminates the need for explicit architecture simulation, further reducing complexity. Our experiments on standard graph and node classification benchmarks show that our methods achieve competitive accuracy while reducing runtime. This makes them practical alternatives for learning on graphs at scale. Full implementation and reproducibility materials are provided at: https://anonymous.4open.science/r/SGNK-1CE4/.

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