Discriminative training for near-synonym substitution

  • Authors:
  • Liang-Chih Yu;Hsiu-Min Shih;Yu-Ling Lai;Jui-Feng Yeh;Chung-Hsien Wu

  • Affiliations:
  • Yuan Ze University;National Chung Cheng University;National Chung Cheng University;National Chia-Yi University;National Cheng Kung University

  • Venue:
  • COLING '10 Proceedings of the 23rd International Conference on Computational Linguistics
  • Year:
  • 2010

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Abstract

Near-synonyms are useful knowledge resources for many natural language applications such as query expansion for information retrieval (IR) and paraphrasing for text generation. However, near-synonyms are not necessarily interchangeable in contexts due to their specific usage and syntactic constraints. Accordingly, it is worth to develop algorithms to verify whether near-synonyms do match the given contexts. In this paper, we consider the near-synonym substitution task as a classification task, where a classifier is trained for each near-synonym set to classify test examples into one of the near-synonyms in the set. We also propose the use of discriminative training to improve classifiers by distinguishing positive and negative features for each near-synonym. Experimental results show that the proposed method achieves higher accuracy than both pointwise mutual information (PMI) and n-gram-based methods that have been used in previous studies.