TAILIEUCHUNG - Báo cáo khoa học: "Unsupervised Semantic Role Induction via Split-Merge Clustering"

In this paper we describe an unsupervised method for semantic role induction which holds promise for relieving the data acquisition bottleneck associated with supervised role labelers. We present an algorithm that iteratively splits and merges clusters representing semantic roles, thereby leading from an initial clustering to a final clustering of better quality. | Unsupervised Semantic Role Induction via Split-Merge Clustering Joel Lang and Mirella Lapata Institute for Language Cognition and Computation School of Informatics University of Edinburgh 10 Crichton Street Edinburgh Eh8 9AB uK mlap@ Abstract In this paper we describe an unsupervised method for semantic role induction which holds promise for relieving the data acquisition bottleneck associated with supervised role labelers. We present an algorithm that iteratively splits and merges clusters representing semantic roles thereby leading from an initial clustering to a final clustering of better quality. The method is simple surprisingly effective and allows to integrate linguistic knowledge transparently. By combining role induction with a rule-based component for argument identification we obtain an unsupervised end-to-end semantic role labeling system. Evaluation on the CoNLL 2008 benchmark dataset demonstrates that our method outperforms competitive unsupervised approaches by a wide margin. 1 Introduction Recent years have seen increased interest in the shallow semantic analysis of natural language text. The term is most commonly used to describe the automatic identification and labeling of the semantic roles conveyed by sentential constituents Gildea and Jurafsky 2002 . Semantic roles describe the relations that hold between a predicate and its arguments abstracting over surface syntactic configurations. In the example sentences below. window occupies different syntactic positions it is the object of broke in sentences 1a b and the subject in 1c while bearing the same semantic role . the physical object affected by the breaking event. Analogously rock is the instrument of break both when 1117 realized as a prepositional phrase in 1a and as a subject in 1b . 1 a. Joe A0 broke the window A1 with a rock A2. b. The rock A2 broke the window A1. c. The window A1 broke. The semantic roles in the examples are labeled in the style of .

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