Paper: Exploiting Named Entity Classes in CCG Surface Realization

ACL ID N09-2041
Title Exploiting Named Entity Classes in CCG Surface Realization
Venue Human Language Technologies
Session Short Paper
Year 2009
Authors

This paper describes how named entity (NE) classes can be used to improve broad cover- age surface realization with the OpenCCG re- alizer. Our experiments indicate that collaps- ing certain multi-word NEs and interpolating a language model where NEs are replaced by their class labels yields the largest quality in- crease, with4-gramsaddingasmalladditional boost. Substantial further benefit is obtained by including class information in the hyper- tagging (supertagging for realization) compo- nent of the system, yielding a state-of-the- art BLEU score of 0.8173 on Section 23 of the CCGbank. A targeted manual evaluation confirms that the BLEU score increase corre- sponds to a significant rise in fluency.