Node-like as a Whole: Structure-aware Searching and Coarsening for Graph Classification

• URL: http://arxiv.org/abs/2404.11869v3
• Date: Thu, 25 Jul 2024 07:29:02 GMT
• Title: Node-like as a Whole: Structure-aware Searching and Coarsening for Graph Classification
• Authors: Xiaorui Qi, Qijie Bai, Yanlong Wen, Haiwei Zhang, Xiaojie Yuan,
• Abstract summary: Graph Transformers (GTs) have made remarkable achievements in graph-level tasks. Can we treat graph structures node-like as a whole to learn high-level features? We propose a novel multi-view graph representation learning model via structure-aware searching and coarsening.
• Score: 14.602474387096244
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Graph Transformers (GTs) have made remarkable achievements in graph-level tasks. However, most existing works regard graph structures as a form of guidance or bias for enhancing node representations, which focuses on node-central perspectives and lacks explicit representations of edges and structures. One natural question is, can we treat graph structures node-like as a whole to learn high-level features? Through experimental analysis, we explore the feasibility of this assumption. Based on our findings, we propose a novel multi-view graph representation learning model via structure-aware searching and coarsening (GRLsc) on GT architecture for graph classification. Specifically, we build three unique views, original, coarsening, and conversion, to learn a thorough structural representation. We compress loops and cliques via hierarchical heuristic graph coarsening and restrict them with well-designed constraints, which builds the coarsening view to learn high-level interactions between structures. We also introduce line graphs for edge embeddings and switch to edge-central perspective to construct the conversion view. Experiments on eight real-world datasets demonstrate the improvements of GRLsc over 28 baselines from various architectures.

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