Improving Word Similarity by Augmenting PMI with Estimates of Word Polysemy
Journal article preprint
MARYLAND UNIV BALTIMORE COUNTY BALTIMORE MD DEPT OF COMPUTER SCIENCE AND ELECTRICAL ENGINEERING
Pagination or Media Count:
Pointwise mutual information PMI is a widely used word similarity measure, but it lacks a clear explanation of how it works. We explore how PMI differs from distributional similarity, and we introduce a novel metric, PMImax, that augments PMI with information about a words number of senses. The coefficients of PMImax are determined empirically by maximizing a utility function based on the performance of automatic thesaurus generation. We show that it outperforms traditional PMI in the application of automatic thesaurus generation and in two word similarity benchmark tasks human similarity ratings and TOEFL synonym questions. PMImax achieves a correlation coefficient comparable to the best knowledge-based approaches on the Miller-Charles similarity rating dataset.
- Information Science