TAILIEUCHUNG - Báo cáo khoa học: "Starting From Scratch in Semantic Role Labeling"

A fundamental step in sentence comprehension involves assigning semantic roles to sentence constituents. To accomplish this, the listener must parse the sentence, find constituents that are candidate arguments, and assign semantic roles to those constituents. Each step depends on prior lexical and syntactic knowledge. Where do children learning their first languages begin in solving this problem? In this paper we focus on the parsing and argumentidentification steps that precede Semantic Role Labeling (SRL) training. We combine a simplified SRL with an unsupervised HMM part of speech tagger, and experiment with psycholinguisticallymotivated ways to label clusters resulting from the HMM. | Starting From Scratch in Semantic Role Labeling Michael Connor University of Illinois connor2@ Yael Gertner University of Illinois ygertner@ Cynthia Fisher University of Illinois cfisher@ Abstract A fundamental step in sentence comprehension involves assigning semantic roles to sentence constituents. To accomplish this the listener must parse the sentence find constituents that are candidate arguments and assign semantic roles to those constituents. Each step depends on prior lexical and syntactic knowledge. Where do children learning their first languages begin in solving this problem In this paper we focus on the parsing and argumentidentification steps that precede Semantic Role Labeling SRL training. We combine a simplified SRL with an unsupervised HMM part of speech tagger and experiment with psycholinguistically-motivated ways to label clusters resulting from the HMM so that they can be used to parse input for the SRL system. The results show that proposed shallow representations of sentence structure are robust to reductions in parsing accuracy and that the contribution of alternative representations of sentence structure to successful semantic role labeling varies with the integrity of the parsing and argumentidentification stages. 1 Introduction In this paper we present experiments with an automatic system for semantic role labeling SRL that is designed to model aspects of human language acquisition. This simplified SRL system is inspired by the syntactic bootstrapping theory and by an account of syntactic bootstrapping known as structure-mapping Fisher 1996 Gillette et al. 1999 Lidz et al. 2003 . Syntactic bootstrapping theory proposes that young children use their very partial knowledge of syntax to guide sen- Dan Roth University of Illinois danr@ tence comprehension. The structure-mapping account makes three key assumptions First sentence comprehension is grounded by the acquisition of an .

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