[PDF][PDF] Evaluation of dependency parsers on unbounded dependencies

J Nivre, L Rimell, R McDonald… - Proceedings of the …, 2010 - aclanthology.org
Proceedings of the 23rd international conference on computational …, 2010aclanthology.org
We evaluate two dependency parsers, MSTParser and MaltParser, with respect to their
capacity to recover unbounded dependencies in English, a type of evaluation that has been
applied to grammarbased parsers and statistical phrase structure parsers but not to
dependency parsers. The evaluation shows that when combined with simple post-
processing heuristics, the parsers correctly recall unbounded dependencies roughly 50% of
the time, which is only slightly worse than two grammar-based parsers specifically designed …
Abstract
We evaluate two dependency parsers, MSTParser and MaltParser, with respect to their capacity to recover unbounded dependencies in English, a type of evaluation that has been applied to grammarbased parsers and statistical phrase structure parsers but not to dependency parsers. The evaluation shows that when combined with simple post-processing heuristics, the parsers correctly recall unbounded dependencies roughly 50% of the time, which is only slightly worse than two grammar-based parsers specifically designed to cope with such dependencies.
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