TAILIEUCHUNG - Báo cáo khoa học: "Which Noun Phrases Denote Which Concepts"

Resolving polysemy and synonymy is required for high-quality information extraction. We present ConceptResolver, a component for the Never-Ending Language Learner (NELL) (Carlson et al., 2010) that handles both phenomena by identifying the latent concepts that noun phrases refer to. ConceptResolver performs both word sense induction and synonym resolution on relations extracted from text using an ontology and a small amount of labeled data. Domain knowledge (the ontology) guides concept creation by defining a set of possible semantic types for concepts. Word sense induction is performed by inferring a set of semantic types for each noun phrase. . | Which Noun Phrases Denote Which Concepts Jayant Krishnamurthy Carnegie Mellon University 5000 Forbes Avenue Pittsburgh PA 15213 jayantk@ Tom M. Mitchell Carnegie Mellon University 5000 Forbes Avenue Pittsburgh PA 15213 Abstract Resolving polysemy and synonymy is required for high-quality information extraction. We present ConceptResolver a component for the Never-Ending Language Learner NELL Carlson et al. 2010 that handles both phenomena by identifying the latent concepts that noun phrases refer to. ConceptResolver performs both word sense induction and synonym resolution on relations extracted from text using an ontology and a small amount of labeled data. Domain knowledge the ontology guides concept creation by defining a set of possible semantic types for concepts. Word sense induction is performed by inferring a set of semantic types for each noun phrase. Synonym detection exploits redundant information to train several domain-specific synonym classifiers in a semi-supervised fashion. When ConceptResolver is run on NELL s knowledge base 87 of the word senses it creates correspond to real-world concepts and 85 of noun phrases that it suggests refer to the same concept are indeed synonyms. 1 Introduction Many information extraction systems construct knowledge bases by extracting structured assertions from free text . NELL Carlson et al. 2010 TextRunner Banko et al. 2007 . A major limitation of many of these systems is that they fail to distinguish between noun phrases and the underlying concepts they refer to. As a result a polysemous phrase like apple will refer sometimes to the concept Apple Computer the company and other times to the concept apple the fruit . Furthermore two synonymous noun phrases like apple and Apple Figure 1 An example mapping from noun phrases left to a set of underlying concepts right . Arrows indicate which noun phrases can refer to which concepts. eli lilly lilly kaspersky labs kaspersky lab kaspersky

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