Coreference Resolution for Morphologically Rich Languages. Adaptation of the Stanford System to Basque

This paper presents the adaptation of the Stanford coreference resolution system to Basque, an agglutinative head-final pro-drop language. The adapted system has been integrated into a global linguistic analysis pipeline so that the input of the system are original Basque raw texts linguistically processed, and annotated. We demonstrate that language-specific characteristics have a noteworthy effect on coreference resolution. In the case of agglutinative languages the use of morphosyntactic features improves substantially the system’s performance, obtaining a gain in CoNLL F1 results of 5 points when automatic mentions are used and of 7.87 points when gold mentions are provided.