New Developments in Parsing Technology

Volume 23 of the series Text, Speech and Language Technology pp 351-372

Parsing and Hypergraphs

  • Dan KleinAffiliated withDepartment of Computer Science, Stanford University
  • , Christopher D. ManningAffiliated withDepartments of Computer Science and Linguistics, Stanford University

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While symbolic parsers can be viewed as deduction systems, this view is less natural for probabilistic parsers. We present a view of parsing as directed hypergraph analysis, which naturally covers both symbolic and probabilistic parsing. We illustrate the approach by showing how a dynamic extension of Dijkstra’s algorithm can be used to construct a probabilistic chart parser with an O(n 3) time bound for arbitrary PCFGs, while preserving as much of the flexibility of symbolic chart parsers as is allowed by the inherent ordering of probabilistic dependencies.