Semantic role labeling of implicit arguments for nominal predicates

  • Authors:
  • Matthew Gerber;Joyce Chai

  • Affiliations:
  • University of Virginia;Michigan State University

  • Venue:
  • Computational Linguistics
  • Year:
  • 2012

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Abstract

Nominal predicates often carry implicit arguments. Recent work on semantic role labeling has focused on identifying arguments within the local context of a predicate; implicit arguments, however, have not been systematically examined. To address this limitation, we have manually annotated a corpus of implicit arguments for ten predicates from NomBank. Through analysis of this corpus, we find that implicit arguments add 71% to the argument structures that are present in NomBank. Using the corpus, we train a discriminative model that is able to identify implicit arguments with an F1 score of 50%, significantly outperforming an informed baseline model. This article describes our investigation, explores a wide variety of features important for the task, and discusses future directions for work on implicit argument identification.