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- W2057155004 abstract "This paper examines the usefulness of corpus-derived probabilistic grammars as a basis for the automatic construction of grammars optimised for a given parsing task. Initially, a probabilistic context-free grammar (PCFG) is derived by a straightforward derivation technique from the Wall Street Journal (WSJ) Corpus, and a baseline is established by testing the resulting grammar on four different parsing tasks. In the first optimisation step, different kinds of local structural context (LSC) are incorporated into the basic PCFG. Improved parsing results demonstrate the usefulness of the added structural context information. In the second optimisation step, LSC-PCFGs are optimised in terms of grammar size and performance for a given parsing task. Tests show that significant improvements can be achieved by the method proposed. The structure of this paper is as follows. Section 2 discusses the practica" @default.
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- W2057155004 title "Optimisation of corpus-derived probabilistic grammars" @default.
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