Matching Knowledge Graphs in Entity Embedding Spaces: An Experimental Study

Weixin Zeng, Xiang Zhao, Zhen Tan, Jiuyang Tang, Xueqi Cheng

Abstract:

Entity alignment (EA) identifies equivalent entities that locate in different knowledge graphs (KGs), and has attracted growing
research interests over the last few years with the advancement of KG embedding techniques. Although a pile of embedding-based EA
frameworks have been developed, they mainly focus on improving the performance of entity representation learning, while largely overlook
the subsequent stage that matches KGs in entity embedding spaces. Nevertheless, accurately matching entities based on learned entity
representations is crucial to the overall alignment performance, as it coordinates individual alignment decisions and determines the global
matching result. Hence, it is essential to understand how well existing solutions for matching KGs in entity embedding spaces perform
on present benchmarks, as well as their strengths and weaknesses. To this end, in this article we provide a comprehensive survey and
evaluation of matching algorithms for KGs in entity embedding spaces in terms of effectiveness and efficiency on both classic settings and
new scenarios that better mirror real-life challenges. Based on in-depth analysis, we provide useful insights into the design trade-offs and
good paradigms of existing works, and suggest promising directions for future development.