Natural Language Processing Coreference Resolution Andrew Tran, Summer 09

What is Coreference Resolution? Coreference occurs when multiple expressions in a document have the same referent. Examples: -Bob’s dog is hungry. It ate the cat. “dog” refers to “dog” , “It” also refers to “dog” -Bob’s friend is Bill. He is hungry. ambiguous Andrew Tran, Summer 09

How is Coreference Resolution Handled? Common strategies and heuristics: Gender, Number and Person Agreement Semantic Consistency Statistical and Clustering methods State of the art coreference programs have around ~75% accuracy. Andrew Tran, Summer 09

My Project Andrew Tran, Summer 09

Andrew Tran, Summer 09

Andrew Tran, Summer 09

Andrew Tran, Summer 09

Will focus on pronoun resolution to start with In addition to commonly used constraints and heuristics, we will apply some tree matching strategies. Example: Bob’s dog is hungry. It ate the cat. Andrew Tran, Summer 09

Future Work Andrew Tran, Summer 09