Neural Attentional Relation Extraction with Dual Dependency Trees |
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| Authors: | Dong Li Zhi-Lei Lei Bao-Yan Song Wan-Ting Ji Yue Kou |
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| Affiliation: | 1.School of Information, Liaoning University, Shenyang 110036, China;2.School of Computer Science and Engineering, Northeastern University, Shenyang 110004, China |
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| Abstract: | Relation extraction has been widely used to find semantic relations between entities from plain text. Dependency trees provide deeper semantic information for relation extraction. However, existing dependency tree based models adopt pruning strategies that are too aggressive or conservative, leading to insufficient semantic information or excessive noise in relation extraction models. To overcome this issue, we propose the Neural Attentional Relation Extraction Model with Dual Dependency Trees (called DDT-REM), which takes advantage of both the syntactic dependency tree and the semantic dependency tree to well capture syntactic features and semantic features, respectively. Specifically, we first propose novel representation learning to capture the dependency relations from both syntax and semantics. Second, for the syntactic dependency tree, we propose a local-global attention mechanism to solve semantic deficits. We design an extension of graph convolutional networks (GCNs) to perform relation extraction, which effectively improves the extraction accuracy. We conduct experimental studies based on three real-world datasets. Compared with the traditional methods, our method improves the F 1 scores by 0.3, 0.1 and 1.6 on three real-world datasets, respectively. |
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| Keywords: | relation extraction graph convolutional network (GCN) syntactic dependency tree semantic dependency tree |
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