Dependency-based empty category detection via phrase structure trees
Nianwen Xue and Yaqin Yang
We describe a novel approach to detecting empty categories (EC) as represented
in dependency trees as well as a new metric for measuring EC detection
accuracy. The new metric takes into account not only the position and type of
an EC, but also the head it is a dependent of in a dependency tree. We also
introduce a variety of new features that are more suited for this approach.
Tested on a subset of the Chinese Treebank, our system improved
significantly over the best previously reported results even when evaluated
with this new, arguably more stringent metric.
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