System for decreasing the time required to parse a sentence
First Claim
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1. A system for parsing sentences, comprising:
- means for providing a sentence to be parsed;
means for providing a context-free grammar;
means for converting said context-free grammar into a lexicalized context-free grammar, said lexicalized context-free grammar employing adjoining, but only allowing non-wrapping adjoining; and
means coupled to said converting means for parsing said sentence in accordance with said lexicalized context-free grammar, said parsing means including means for determining if the sentence is parsable, and if parsable means for producing a corresponding parse tree; and
,means coupled to said parsing means for utilizing said parse tree.
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Abstract
A system is provided for dramatically decreasing the time required to parse a sentence by automatically converting a context-free grammar into a lexicalized form called lexicalized context-free grammar (LCFG) which is used in the parsing process. Lexicalized context-free grammar employs adjoining but, to decrease parsing time, only allows non-wrapping adjoining. The lexicalized context-free grammar is parsed using a parser that decreases parsing time by filtering the grammar based on the words in a sentence and maintaining the valid prefix property while parsing.
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7 Claims
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1. A system for parsing sentences, comprising:
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means for providing a sentence to be parsed; means for providing a context-free grammar; means for converting said context-free grammar into a lexicalized context-free grammar, said lexicalized context-free grammar employing adjoining, but only allowing non-wrapping adjoining; and means coupled to said converting means for parsing said sentence in accordance with said lexicalized context-free grammar, said parsing means including means for determining if the sentence is parsable, and if parsable means for producing a corresponding parse tree; and
,means coupled to said parsing means for utilizing said parse tree. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification