Keyphrase Extraction

Keyphrases are words that capture the main topics of a document. Extracting high- quality keyphrases can benefit various natural language processing (NLP) applications: in text summarization, keyphrases are useful as a form of semantic metadata indicating the significance of sentences and paragraphs, in which they appear; in both text categorization and document clustering, keyphrases offer a means of term dimensionality reduction, and have been shown to improve system efficiency and accuracy; and for search engines, keyphrases can supplement full-text indexing and assist users in formulating queries.