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Sparsity and normalization in word similarity systems

Published online by Cambridge University Press:  19 August 2015

JEAN MARK GAWRON
Affiliation:
Department of Linguistics, San Diego State University, San Diego, CA, USA e-mails: [email protected], [email protected]
KELLEN STEPHENS
Affiliation:
Department of Linguistics, San Diego State University, San Diego, CA, USA e-mails: [email protected], [email protected]

Abstract

We investigate the problem of improving performance in distributional word similarity systems trained on sparse data, focusing on a family of similarity functions we call Dice-family functions (Dice 1945Ecology26(3): 297–302), including the similarity function introduced in Lin (1998Proceedings of the 15th International Conference on Machine Learning, 296–304), and Curran (2004 PhD thesis, University of Edinburgh. College of Science and Engineering. School of Informatics), as well as a generalized version of Dice Coefficient used in data mining applications (Strehl 2000, 55). We propose a generalization of the Dice-family functions which uses a weight parameter α to make the similarity functions asymmetric. We show that this generalized family of functions (α systems) all belong to the class of asymmetric models first proposed in Tversky (1977Psychological Review84: 327–352), and in a multi-task evaluation of ten word similarity systems, we show that α systems have the best performance across word ranks. In particular, we show that α-parameterization substantially improves the correlations of all Dice-family functions with human judgements on three words sets, including the Miller–Charles/Rubenstein Goodenough word set (Miller and Charles 1991Language and Cognitive Processes6(1): 1–28; Rubenstein and Goodenough 1965Communications of the ACM8: 627–633).

Type
Articles
Copyright
Copyright © Cambridge University Press 2015 

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