Han Hu


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Graph Hawkes Transformer for Extrapolated Reasoning on Temporal Knowledge Graphs
Haohai Sun | Shangyi Geng | Jialun Zhong | Han Hu | Kun He
Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing

Temporal Knowledge Graph (TKG) reasoning has attracted increasing attention due to its enormous potential value, and the critical issue is how to model the complex temporal structure information effectively. Recent studies use the method of encoding graph snapshots into hidden vector space and then performing heuristic deductions, which perform well on the task of entity prediction. However, these approaches cannot predict when an event will occur and have the following limitations: 1) there are many facts not related to the query that can confuse the model; 2) there exists information forgetting caused by long-term evolutionary processes. To this end, we propose a Graph Hawkes Transformer (GHT) for both TKG entity prediction and time prediction tasks in the future time. In GHT, there are two variants of Transformer, which capture the instantaneous structural information and temporal evolution information, respectively, and a new relational continuous-time encoding function to facilitate feature evolution with the Hawkes process. Extensive experiments on four public datasets demonstrate its superior performance, especially on long-term evolutionary tasks.


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Imbalanced Chinese Multi-label Text Classification Based on Alternating Attention
Hongliang Bi | Han Hu | Pengyuan Liu
Proceedings of the 34th Pacific Asia Conference on Language, Information and Computation

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小样本关系分类研究综述(Few-Shot Relation Classification: A Survey)
Han Hu (胡晗) | Pengyuan Liu (刘鹏远)
Proceedings of the 19th Chinese National Conference on Computational Linguistics

关系分类作为构建结构化知识的重要一环,在自然语言处理领域备受关注。但在很多应用领域中(医疗、金融领域),收集充足的用于训练关系分类模型的数据是十分困难的。近年来,仅需要少量训练样本的小样本学习研究逐渐新兴于各大领域。本文对近期小样本关系分类模型与方法进行了系统的综述。根据度量方法的不同,将现有方法分为原型式和分布式两大类。根据是否利用额外信息,将模型分为预训练和非预训练两大类。此外,除了常规设定下的小样本学习,本文还梳理了跨领域和稀缺资源场景下的小样本学习,并探讨了目前小样本关系分类方法的局限性,分析了跨领域小样本 学习面临的技术挑战。最后,展望了小样本关系分类未来的发展方向。