Use of Internet for augmenting coverage in a lexical acquisition system from raw corpora: application to Russian

Abstract

This paper presents a methodology for the automatic acquisition of lexical resources from raw corpora. This methodology has proved to be efficient for those languages that, like Russian, present a rich and mainly concatenative morphology. This method can be applied for the creation of new resources, as well as in the enrichment of existing ones. We also present an extension of the system that uses automatic querying to Internet to acquire these entries for which there is not enough information in our corpus. The new basic acquisition methodology achieves similar results compared to the previous methods, but the use of Internet queries allows to increase recall levels with only a slight decrease in precision, obtaining signigicantly better overall results.