Computational Linguistics Colloquium

Thursday, December 13, 16:15, Building 17, Seminar Room

High Precision Extraction of Grammatical Relations

Head-dependent relationships (or grammatical relations) have been advocated as a useful level of representation for grammatical structure in a number of different large-scale language-processing tasks and applications.

A parsing system returning analyses in the form of sets of grammatical relations can obtain high precision if it hypothesises a particular relation only when it is certain that the relation is correct. We operationalise this technique - in a statistical parser using a manually-developed wide-coverage grammar of English - by only returning relations that form part of all analyses licensed by the grammar. We observe an increase in precision from 75% to over 90% (at the cost of a reduction in recall) on a test corpus of naturally-occurring text.

If you would like to meet with the speaker, please contact Amit Dubey.