Automatic Identification of Coordination with Overt Conjunctions Based on Conditional Random Fields
Nian Hong-dong · Zhongwen xinxi xuebao · 2008
After introducing the basic principle of Conditional Random Fields(CRF),this article first defines the tag set with 7 words based on linguistic characteristic of Chinese coordination with overt conjunctions.Then it designs feature templates with 18 complex features and additional 4 linguistic features respectively for the CRF based identification of the coordination with overt conjunctions.Experiments on nesting coordination,non-nesting coordination and longest coordination in the Peking University Corpus and Tsinghua University 973 Tree Bank achieve the best F-score of 88.21%,87.85% and 84.42% respectively in the open tests.