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Dependency Treebank Annotation and Null Elements: An Experiment with VIT

TitleDependency Treebank Annotation and Null Elements: An Experiment with VIT
Publication TypeBook Chapter
Year of Publication2015
AuthorsDelmonte R
EditorBasili R, Bosco C, Delmonte R, Moschitti A, Simi M
Book TitleHarmonization and Development of Resources and Tools for Italian Natural Language Processing within the PARLI Project
Series TitleStudies in Computational Intelligence
PublisherSpringer International Publishing
ISBN Number978-3-319-14205-0

State of the art parsers are currently trained on converted versions of Penn Treebank into dependency representations, which however don’t include null elements. This is done to facilitate structural learning and prevents the probabilistic engine to postulate the existence of deprecated null elements everywhere, see [19]. However it is a fact that in this way the semantics of the representation used and produced is inconsistent and will reduce dramatically its usefulness in real life applications, like Q/A and other semantically driven fields, by hampering the mapping of a complete logical form. What systems have come up with are “quasi”-logical forms or partial logical forms mapped directly from the surface representation in dependency structure. We show the most common problems derived from the conversion and then describe an algorithm that we have implemented to apply to our converted Italian Treebank, that can be used on any CoNLL-like treebank or representation to produce an almost complete semantically consistent dependency treebank.