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While world knowledge has been shown to improve learning-based coreference resolvers, the improvements were typically obtained by incorporating world knowledge into a fairly weak baseline resolver. Hence, it is not clear whether these benefits can carry over to a stronger baseline. Moreover, since there has been no attempt to apply different sources of world knowledge in combination to coreference resolution, it is not clear whether they offer complementary benefits to a resolver. | Coreference Resolution with World Knowledge Altaf Rahman and Vincent Ng Human Language Technology Research Institute University of Texas at Dallas Richardson TX 75083-0688 altaf vince @hlt.utdallas.edu Abstract While world knowledge has been shown to improve learning-based coreference resolvers the improvements were typically obtained by incorporating world knowledge into a fairly weak baseline resolver. Hence it is not clear whether these benefits can carry over to a stronger baseline. Moreover since there has been no attempt to apply different sources of world knowledge in combination to coreference resolution it is not clear whether they offer complementary benefits to a resolver. We systematically compare commonly-used and under-investigated sources of world knowledge for coreference resolution by applying them to two learning-based coreference models and evaluating them on documents annotated with two different annotation schemes. 1 Introduction Noun phrase NP coreference resolution is the task of determining which NPs in a text or dialogue refer to the same real-world entity. The difficulty of the task stems in part from its reliance on world knowledge Charniak 1972 . To exemplify consider the following text fragment. Martha Stewart is hoping people don t run out on her. The celebrity indicted on charges stemming from . Having the world knowledge that Martha Stewart is a celebrity would be helpful for establishing the coreference relation between the two NPs. One may argue that employing heuristics such as subject preference or syntactic parallelism which prefers resolving an NP to a candidate antecedent that has the same grammatical role in this example would also allow us to correctly resolve the celebrity Mitkov 814 2002 thereby obviating the need for world knowledge. However since these heuristics are not perfect complementing them with world knowledge would be an important step towards bringing coreference systems to the next level of performance. .
