2011 Fiscal Year Final Research Report
Parsing with Coordinate Structure Analysis based on Sequence Alignment
| Project/Area Number |
21700170
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Intelligent informatics
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| Research Institution | National Institute of Genetics (2011)
Nara Institute of Science and Technology (2009-2010) |
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Principal Investigator |
HARA Kazuo 国立遺伝学研究所, 生命情報・DDBJ研究センター, 研究員 (30467691)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 自然言語処理 / 構文解析 / 機械学習 / 並列句解析 / アラインメント |
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| Research Abstract |
For a given sentence in which coordination conjunctions such as and or "or" occur, detecting the scope of word sequences that the coordination conjunctions join together, as well as distinguishing the grammatical category of it, are deemed fundamental in natural language processing. However, even the state-of-the-art parsers can identify only around fifty percent of such coordination scopes and their grammatical category. To cope with the problem, we developed a methodology that employs a CKY algorithm based on the grammar we customize for coordination as well as a tunable similarity measures we define via sequence alignment and averaged perceptron, which improves performance very well.
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