Directional Distributional Similarity for Lexical Expansion

  title={Directional Distributional Similarity for Lexical Expansion},
  author={Lili Kotlerman and Ido Dagan and Idan Szpektor and Maayan Zhitomirsky-Geffet},
Distributional word similarity is most commonly perceived as a symmetric relation. Yet, one of its major applications is lexical expansion, which is generally asymmetric. This paper investigates the nature of directional (asymmetric) similarity measures, which aim to quantify distributional feature inclusion. We identify desired properties of such measures, specify a particular one based on averaged precision, and demonstrate the empirical benefit of directional measures for expansion. 
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