Stochastic HPSG Parse Disambiguation using the Redwoods Corpus
This article details our experiments on HPSG parse disambiguation, based on the Redwoods treebank. Using existing and novel stochastic models, we evaluate the usefulness of different information sources for disambiguation – lexical, syntactic, and semantic. We perform careful comparisons of generative and discriminative models using equivalent features and show the consistent advantage of discriminatively trained models. Our best system performs at over 76% sentence exact match accuracy.