tailieunhanh - Báo cáo khoa học: "GRADED UNIFICATION: INTERACTIVE A FRAMEWORK PROCESSING"

An extension to classical unification, called graded unification is presented. It is capable of combining contradictory information. An interactive processing paradigm and parser based on this new operator are also presented. Introduction Improved understanding of the nature of knowledge used in human language processing suggests the feasibility of interactive models in computational linguistics (CL). Recent psycholinguistic work such as (Stowe, 1989; Trueswell et al., 1994) has documented rapid employment of semantic information to guide human syntactic processing. . | GRADED UNIFICATION A FRAMEWORK FOR INTERACTIVE PROCESSING Albert Kim Department of Computer and Information Sciences University of Pennsylvania Philadelphia Pennsylvania USA email alkim@ Abstract An extension to classical unification called graded unification is presented. It is capable of combining contradictory information. An interactive processing paradigm and parser based on this new operator are also presented. Introduction Improved understanding of the nature of knowledge used in human language processing suggests the feasibility of interactive models in computational linguistics CL . Recent psycholinguistic work such as Stowe 1989 Trueswell et al. 1994 has documented rapid employment of semantic information to guide human syntactic processing. In addition corpus-based stochastic modelling of lexical patterns see Weischedel el al. 1993 may provide information about word sense frequency of the kind advocated since Ford et al. 1982 . Incremental employment of such knowledge to resolve syntactic ambiguity is a natural step towards improved cognitive accuracy and efficiency in CL models. This exercise will however pose difficulties for the classical hard constraint-based paradigm. As illustrated by the Trueswell cl al. 1994 results this view of constraints is too rigid to handle the kinds of effects at hand. These experiments used pairs of locally ambiguous reduced relative clauses such as 1 the man recognized by the spy took off down the street 2 the van recognized by the spy took off down the street The verb recognized is ambiguously either a past participial form or a past tense form. Eye tracking showed that subjects resolved the ambiguity rapidly before reading the Ếy-phrase in 2 but not in 1 L The conclusion they draw is that subjects use knowledge about thematic roles to guide syntactic decisions. Since van which is inanimate makes a good Theme but a poor Agent for recognized the past participial analysis in 2 is reinforced and the main