Learning Joint Structural and Temporal Contextualized Knowledge Embeddings for Temporal Knowledge Graph Completion

Yifu Gao, Yongquan He, Zhigang Kan, Yi Han, Linbo Qiao, Dongsheng Li


Abstract
Temporal knowledge graph completion that predicts missing links for incomplete temporal knowledge graphs (TKG) is gaining increasing attention. Most existing works have achieved good results by incorporating time information into static knowledge graph embedding methods. However, they ignore the contextual nature of the TKG structure, i.e., query-specific subgraph contains both structural and temporal neighboring facts. This paper presents the SToKE, a novel method that employs the pre-trained language model (PLM) to learn joint Structural and Temporal Contextualized Knowledge Embeddings.Specifically, we first construct an event evolution tree (EET) for each query to enable PLMs to handle the TKG, which can be seen as a structured event sequence recording query-relevant structural and temporal contexts. We then propose a novel temporal embedding and structural matrix to learn the time information and structural dependencies of facts in EET.Finally, we formulate TKG completion as a mask prediction problem by masking the missing entity of the query to fine-tune pre-trained language models. Experimental results on three widely used datasets show the superiority of our model.
Anthology ID:
2023.findings-acl.28
Volume:
Findings of the Association for Computational Linguistics: ACL 2023
Month:
July
Year:
2023
Address:
Toronto, Canada
Editors:
Anna Rogers, Jordan Boyd-Graber, Naoaki Okazaki
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
417–430
Language:
URL:
https://aclanthology.org/2023.findings-acl.28
DOI:
10.18653/v1/2023.findings-acl.28
Bibkey:
Cite (ACL):
Yifu Gao, Yongquan He, Zhigang Kan, Yi Han, Linbo Qiao, and Dongsheng Li. 2023. Learning Joint Structural and Temporal Contextualized Knowledge Embeddings for Temporal Knowledge Graph Completion. In Findings of the Association for Computational Linguistics: ACL 2023, pages 417–430, Toronto, Canada. Association for Computational Linguistics.
Cite (Informal):
Learning Joint Structural and Temporal Contextualized Knowledge Embeddings for Temporal Knowledge Graph Completion (Gao et al., Findings 2023)
Copy Citation:
PDF:
https://aclanthology.org/2023.findings-acl.28.pdf
Video:
 https://aclanthology.org/2023.findings-acl.28.mp4