Favor Short Dependencies: Parsing with Soft and Hard Constraints on Dependency Length

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Abstract

Many modern parsers identify the head word of each constituent they find. This makes it possible to identify the word-to-word dependencies implicit in a parse. Some parsers, known as dependency parsers, even return these dependencies as their primary output. Why bother to identify dependencies? The typical reason is to model the fact that some word pairs are more likely than others to engage in a dependency relationship.