Improving unsupervised keyphrase extraction by modeling hierarchical multi-granularity features
Existing unsupervised keyphrase extraction methods typically emphasize the importance of the candidate keyphrase itself, ignoring other important factors such as the influence of uninformative sentences. We hypothesize that the salient sentences of a document are particularly important as they are m...
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| Published in: | Information processing & management Vol. 60; no. 4; p. 103356 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Ltd
01.07.2023
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| ISSN: | 0306-4573 |
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| Abstract | Existing unsupervised keyphrase extraction methods typically emphasize the importance of the candidate keyphrase itself, ignoring other important factors such as the influence of uninformative sentences. We hypothesize that the salient sentences of a document are particularly important as they are most likely to contain keyphrases, especially for long documents. To our knowledge, our work is the first attempt to exploit sentence salience for unsupervised keyphrase extraction by modeling hierarchical multi-granularity features. Specifically, we propose a novel position-aware graph-based unsupervised keyphrase extraction model, which includes two model variants. The pipeline model first extracts salient sentences from the document, followed by keyphrase extraction from the extracted salient sentences. In contrast to the pipeline model which models multi-granularity features in a two-stage paradigm, the joint model accounts for both sentence and phrase representations of the source document simultaneously via hierarchical graphs. Concretely, the sentence nodes are introduced as an inductive bias, injecting sentence-level information for determining the importance of candidate keyphrases. We compare our model against strong baselines on three benchmark datasets including Inspec, DUC 2001, and SemEval 2010. Experimental results show that the simple pipeline-based approach achieves promising results, indicating that keyphrase extraction task benefits from the salient sentence extraction task. The joint model, which mitigates the potential accumulated error of the pipeline model, gives the best performance and achieves new state-of-the-art results while generalizing better on data from different domains and with different lengths. In particular, for the SemEval 2010 dataset consisting of long documents, our joint model outperforms the strongest baseline UKERank by 3.48%, 3.69% and 4.84% in terms of F1@5, F1@10 and F1@15, respectively. We also conduct qualitative experiments to validate the effectiveness of our model components.
•To our knowledge, our work is the first attempt to exploit the salience of sentences for unsupervised keyphrase extraction by modeling hierarchical multi-granularity features.•Our empirical study shows positive synergy between the salient sentence extraction task and the keyphrase extraction task, suggesting that better integration of these two tasks is a promising research direction.•Our method consistently outperforms all existing competitors across the three datasets, each with different document length, covering two different domains. |
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| AbstractList | Existing unsupervised keyphrase extraction methods typically emphasize the importance of the candidate keyphrase itself, ignoring other important factors such as the influence of uninformative sentences. We hypothesize that the salient sentences of a document are particularly important as they are most likely to contain keyphrases, especially for long documents. To our knowledge, our work is the first attempt to exploit sentence salience for unsupervised keyphrase extraction by modeling hierarchical multi-granularity features. Specifically, we propose a novel position-aware graph-based unsupervised keyphrase extraction model, which includes two model variants. The pipeline model first extracts salient sentences from the document, followed by keyphrase extraction from the extracted salient sentences. In contrast to the pipeline model which models multi-granularity features in a two-stage paradigm, the joint model accounts for both sentence and phrase representations of the source document simultaneously via hierarchical graphs. Concretely, the sentence nodes are introduced as an inductive bias, injecting sentence-level information for determining the importance of candidate keyphrases. We compare our model against strong baselines on three benchmark datasets including Inspec, DUC 2001, and SemEval 2010. Experimental results show that the simple pipeline-based approach achieves promising results, indicating that keyphrase extraction task benefits from the salient sentence extraction task. The joint model, which mitigates the potential accumulated error of the pipeline model, gives the best performance and achieves new state-of-the-art results while generalizing better on data from different domains and with different lengths. In particular, for the SemEval 2010 dataset consisting of long documents, our joint model outperforms the strongest baseline UKERank by 3.48%, 3.69% and 4.84% in terms of F1@5, F1@10 and F1@15, respectively. We also conduct qualitative experiments to validate the effectiveness of our model components.
•To our knowledge, our work is the first attempt to exploit the salience of sentences for unsupervised keyphrase extraction by modeling hierarchical multi-granularity features.•Our empirical study shows positive synergy between the salient sentence extraction task and the keyphrase extraction task, suggesting that better integration of these two tasks is a promising research direction.•Our method consistently outperforms all existing competitors across the three datasets, each with different document length, covering two different domains. |
| ArticleNumber | 103356 |
| Author | Lin, Chenghua Liang, Xinnian Zhang, Zhihao Zuo, Yuan |
| Author_xml | – sequence: 1 givenname: Zhihao orcidid: 0000-0002-8860-0881 surname: Zhang fullname: Zhang, Zhihao organization: School of Economics and Management, Beihang University, Beijing, China – sequence: 2 givenname: Xinnian surname: Liang fullname: Liang, Xinnian organization: State Key Lab of Software Development Environment, Beihang University, Beijing, China – sequence: 3 givenname: Yuan surname: Zuo fullname: Zuo, Yuan organization: School of Economics and Management, Beihang University, Beijing, China – sequence: 4 givenname: Chenghua orcidid: 0000-0003-3454-2468 surname: Lin fullname: Lin, Chenghua email: c.lin@sheffield.ac.uk organization: Department of Computer Science, The University of Sheffield, Sheffield, UK |
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| Keywords | Unsupervised keyphrase extraction Hierarchical Multi-granularity features Graph-based ranking algorithm |
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