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TeKET: a Tree-Based Unsupervised Keyphrase Extraction Technique
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DOI：10.1007/s12559-019-09706-3.png)
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Abstract
En 中文
Automatic keyphrase extraction techniques aim to extract quality keyphrases for higher level summarization of a document. Majority of the existing techniques are mainly domain-specific, which require application domain knowledge and employ higher order statistical methods, and computationally expensive and require large train data, which is rare for many applications. Overcoming these issues, this paper proposes a new unsupervised keyphrase extraction technique. The proposed unsupervised keyphrase extraction technique, namedTeKETorTree-based Keyphrase Extraction Technique, is a domain-independent technique that employs limited statistical knowledge and requires no train data. This technique also introduces a new variant of a binary tree, calledKeyPhrase Extraction(KePhEx) tree, to extract final keyphrases from candidate keyphrases. In addition, a measure, calledCohesiveness IndexorCI, is derived which denotes a given node's degree of cohesiveness with respect to the root. The CI is used in flexibly extracting final keyphrases from the KePhEx tree and is co-utilized in the ranking process. The effectiveness of the proposed technique and its domain and language independence are experimentally evaluated using available benchmark corpora, namely SemEval-2010 (a scientific articles dataset), Theses100 (a thesis dataset), and aGerman Research Articledataset, respectively. The acquired results are compared with other relevant unsupervised techniques belonging to both statistical and graph-based techniques. The obtained results demonstrate the improved performance of the proposed technique over other compared techniques in terms of precision, recall, and F1 scores.
Keywords:
Candidate keyphrase
Unsupervised machine learning
Automatic keyphrase extraction
Document processing
Recommender system
Binary tree
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