Coordination-Aware Dependency Parsing (Preliminary Report)

Coordinate structures pose difficulties in dependency parsers. In this paper, we propose a set of parsing rules specifically designed to handle coordination, which are intended to be used in combination with Eisner and Satta’s dependency rules. The new rules are compatible with existing similarity-based approaches to coordination structure analysis, and thus the syntactic and semantic similarity of conjuncts can be incorporated to the parse scoring function. Although we are yet to implement such a scoring function, we analyzed the time complexity of the proposed rules as well as their coverage of the Penn Treebank converted to the Stanford basic dependencies.