文献类型：期刊文献

英文题名：HRCL: Hierarchical Relation Contrastive Learning for Low-Resource Relation Extraction

作者：Guo, Qian[1];Guo, Yi[1];Zhao, Jin[2]

机构：[1]East China Univ Sci & Technol, Dept Comp Sci & Engn, Shanghai 200237, Peoples R China;[2]Fudan Univ, Sch Comp Sci, Shanghai Key Lab Data Sci, Shanghai 200433, Peoples R China

年份：2025

卷号：36

期号：4

起止页码：7263

外文期刊名：IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS

收录：;EI(收录号：20241916047725);WOS:【SCI-EXPANDED(收录号:WOS:001214266300001)】；

基金：No Statement Available

语种：英文

外文关键词：Hierarchical propagation clustering; low-resource relation extraction (LRE); relation contrastive learning; relational feature space

摘要：Low-resource relation extraction (LRE) aims to extract the relationships between given entities from natural language sentences in low-resource application scenarios, which has been an incredibly challenging task due to the limited annotated corpora. Existing studies either leverage self-training schemes to expand the scale of labeled data, while the error accumulation of pseudo-labels' selection bias provoke the gradual drift problem in subsequent relation prediction, or utilize the instance-wise contrastive learning that fails to distinguish those sentence pairs with similar semantics. To alleviate these defects, this article introduces a novel contrastive learning framework called hierarchical relation contrastive learning (HRCL) for LRE. HRCL leverages task-related instruction description and schema-constrained as prompts to generate high-level relation representations. To enhance the efficacy of contrastive learning, we further employ hierarchical affinity propagation clustering (HiPC) to derive hierarchical signals from relational feature space with a hierarchy cross-attention (HCA) mechanism and effectively optimize pair-level relation features through relation-wise contrastive learning. Exhaustive experiments have been conducted on five public relation extraction (RE) datasets in low-resource settings. The results demonstrate the effectiveness and robustness of HRCL and outperform the current state-of-the-art (SOTA) model by 6.56% on average in terms of (BF1)-F-3 . Our source code is publicly available at https://github.com/Phevos75/HRCLRE.