tailieunhanh - Báo cáo khoa học: "Compositional Matrix-Space Models of Language"

We propose CMSMs, a novel type of generic compositional models for syntactic and semantic aspects of natural language, based on matrix multiplication. We argue for the structural and cognitive plausibility of this model and show that it is able to cover and combine various common compositional NLP approaches ranging from statistical word space models to symbolic grammar formalisms. | Compositional Matrix-Space Models of Language Sebastian Rudolph Karlsruhe Institute of Technology Karlsruhe Germany rudolph@ Eugenie Giesbrecht FZI Forschungszentrum Informatik Karlsuhe Germany giesbrecht@ Abstract We propose CMSMs a novel type of generic compositional models for syntactic and semantic aspects of natural language based on matrix multiplication. We argue for the structural and cognitive plausibility of this model and show that it is able to cover and combine various common compositional NLP approaches ranging from statistical word space models to symbolic grammar formalisms. 1 Introduction In computational linguistics and information retrieval Vector Space Models Salton et al. 1975 and its variations - such as Word Space Models Schutze 1993 Hyperspace Analogue to Language Lund and Burgess 1996 or Latent Semantic Analysis Deerwester et al. 1990 - have become a mainstream paradigm for text representation. Vector Space Models VSMs have been empirically justified by results from cognitive science Gardenfors 2000 . They embody the distributional hypothesis of meaning Firth 1957 according to which the meaning of words is defined by contexts in which they co- occur. Depending on the specific model employed these contexts can be either local the co-occurring words or global a sentence or a paragraph or the whole document . Indeed VSMs proved to perform well in a number of tasks requiring computation of semantic relatedness between words such as synonymy identification Landauer and Dumais 1997 automatic thesaurus construction Grefenstette 1994 semantic priming and word sense disambiguation Padó and Lapata 2007 . Until recently little attention has been paid to the task of modeling more complex conceptual structures with such models which constitutes a crucial barrier for semantic vector models on the way to model language Widdows 2008 . An emerging area of research receiving more and more attention among the advocates of distributional models .

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