Systematic Relational Reasoning With Epistemic Graph Neural Networks

• URL: http://arxiv.org/abs/2407.17396v2
• Date: Thu, 27 Feb 2025 22:50:41 GMT
• Title: Systematic Relational Reasoning With Epistemic Graph Neural Networks
• Authors: Irtaza Khalid, Steven Schockaert,
• Abstract summary: We propose the Epistemic GNN (EpiGNN), a novel parameter-efficient and scalable GNN architecture with an inductive bias for systematic reasoning.<n>We show that EpiGNNs achieve state-of-the-art results on link prediction tasks that require systematic reasoning.<n>For inductive knowledge graph completion, EpiGNNs rival the performance of state-of-the-art specialized approaches.
• Score: 17.49288661342947
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Developing models that can learn to reason is a notoriously challenging problem. We focus on reasoning in relational domains, where the use of Graph Neural Networks (GNNs) seems like a natural choice. However, previous work has shown that regular GNNs lack the ability to systematically generalize from training examples on test graphs requiring longer inference chains, which fundamentally limits their reasoning abilities. A common solution relies on neuro-symbolic methods that systematically reason by learning rules, but their scalability is often limited and they tend to make unrealistically strong assumptions, e.g.\ that the answer can always be inferred from a single relational path. We propose the Epistemic GNN (EpiGNN), a novel parameter-efficient and scalable GNN architecture with an epistemic inductive bias for systematic reasoning. Node embeddings in EpiGNNs are treated as epistemic states, and message passing is implemented accordingly. We show that EpiGNNs achieve state-of-the-art results on link prediction tasks that require systematic reasoning. Furthermore, for inductive knowledge graph completion, EpiGNNs rival the performance of state-of-the-art specialized approaches. Finally, we introduce two new benchmarks that go beyond standard relational reasoning by requiring the aggregation of information from multiple paths. Here, existing neuro-symbolic approaches fail, yet EpiGNNs learn to reason accurately. Code and datasets are available at https://github.com/erg0dic/gnn-sg.

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