TAILIEUCHUNG - Báo cáo khoa học: "Using Restriction to Extend Parsing Algorithms for Complex-Feature-Based Formalisms"

G r a m m a r formalisms based on the encoding of grammatical information in complex-valued feature systems enjoy some currency both in linguistics and natural-language-processing research. Such formalisms can be thought of by analogy to context-free grammars as generalizing the notion of nonterminal symbol from a finite domain of atomic elements to a possibly infinite domain of directed graph structures nf a certain sort. | Using Restriction to Extend Parsing Algorithms for Complex-Feature-Based Formalisms Stuart M. Shieber Artificial Intelligence Center SRI International and Center for the Study of Language and Information Stanford University Abstract 1 Introduction Grammar formalisms based on the encoding of grammatical information in complex-valued feature systems enjoy some currency both in linguistics and natural-language-processing research. Such formalisms can be thought of by analogy to context-free grammars as generalizing the notion of nonterminal symbol from a finite domain of atomic elements to a possibly infinite domain of directed graph structures of a certain sort. Unfortunately in moving to an infinite nonterminal domain standard methods of parsing may no longer be applicable to the formalism. Typically the problem manifests itself as gross inefficiency or even nontermination of the algorithms. In this paper we discuss a solution to the problem of extending parsing algorithms to formalisms with possibly infinite nonterminal domains a solution based on a general technique we call restriction. As a particular example of such an extension we present a complete correct terminating extension of Earley s algorithm that uses restriction to perform top-down filtering. Our implementation of this algorithm demonstrates the drastic elimination of chart edges that can be achieved by this technique. Finally. we describe further uses for the technique including parsing other grammar formalisms including definite-clause grammars extending other parsing algorithms including LR methods and syntactic preference modeling algorithms and efficient indexing. This research has been made possible in part by a girt from the Systems Development Foundation and was also supported by the Defense Advanced Research Projects Agency under Contract N with the Naval Electronics Systems Command. The views and conclusions contained in this document should not be interpreted as .

• Báo cáo khoa học
• Using Restriction
• Parsing Algorithms
• Complex Feature Based Formalisms
• scientific reports
• model language
• process natural language
• BMC Biotechnology
• Second generation sequencing technology
• Genotyping by sequencing
• 5 methylcytosine
• Restriction endonuclease
• DNA shearing
• Restriction free cloning
• Gene reconstitution
• Single primer PCR
• High throughput cloning
• BMC Genomics
• Restriction site associated DNA sequencing
• Restriction enzyme
• Reference genome
• Transcriptome assembly
• Antarctic fur seal
• Energy homeostasis
• Dietary restriction
• Negative energy balance
• Restricted Anovulatory
• Klebsiella 16srRNA
• Restriction site annotation
• Sticky ends cutting Endonucleases
• Cutting endonucleases
• Klebsiella 16s ribosomal RNA
• báo cáo khoa học
• báo cáo hóa học
• công trình nghiên cứu về hóa học
• tài liệu về hóa học
• cách trình bày báo cáo
• trình bày báo cáo
• tài liệu báo cáo khoa học
• báo cáo y học
• kiến thức y học
• nghiên cứu y học
• Legumes Fabaceae or Leguminosae
• Identification of species
• Chloroplast DNA data
• Forage legume species
• Polymerase chain reaction
• Restriction fragment length polymorphism
• BMC Bioinformatics
• Restriction enzyme cut site
• Optical map
• Reference genome assemblies
• Downstream analysis
• Microbial ecology
• DNA fingerprinting
• DNA sequencer
• Bacterial metabolism
• Mass spectrometric analysis
• Microbial metabolism
• Specific organism
• Plant Biology
• Brassica napus
• Double digest restriction site
• DNA sequencing
• Single nucleotide polymorphisms
• Agronomic traits
• Area under the curves
• Insulinogenic index
• Type 2 diabetes mellitus
• Morbus value
• Delta ratio of IGI
• AUC ratio of IGI