HybEA: Hybrid Models for Entity Alignment

TL;DR

HybEA is a hybrid entity alignment framework combining an attention-based factual model with a structural model, significantly improving accuracy across diverse multilingual and multi-domain knowledge graphs.

Contribution

The paper introduces HybEA, a novel hybrid framework that effectively addresses heterogeneity in knowledge graphs by integrating factual and structural models, outperforming existing methods.

Findings

HybEA achieves a 16% average relative improvement in Hits@1.

Outperforms all baseline methods across 10 datasets.

Effective in multilingual and multi-domain knowledge graphs.

Abstract

Entity Alignment (EA) aims to detect descriptions of the same real-world entities among different Knowledge Graphs (KG). Several embedding methods have been proposed to rank potentially matching entities of two KGs according to their similarity in the embedding space. However, existing EA embedding methods are challenged by the diverse levels of structural (i.e., neighborhood entities) and semantic (e.g., entity names and literal property values) heterogeneity exhibited by real-world KGs, especially when they are spanning several domains (DBpedia, Wikidata). Existing methods either focus on one of the two heterogeneity kinds depending on the context (mono- vs multi-lingual). To address this limitation, we propose a flexible framework called HybEA, that is a hybrid of two models, a novel attention-based factual model, co-trained with a state-of-the-art structural model. Our experimental results demonstrate that HybEA outperforms the state-of-the-art EA systems, achieving a 16% average relative improvement of Hits@1, ranging from 3.6% up to 40% in 5 monolingual datasets, with some datasets that can now be considered as solved. We also show that HybEA outperforms state-of-the-art methods in 3 multi-lingual datasets, as well as on 2 datasets that drop the unrealistic, yet widely adopted, one-to-one assumption. Overall, HybEA outperforms all (11) baseline methods in all (3) measures and in all (10) datasets evaluated, with a statistically significant difference.