Faster generation of super condensed neighbourhoods using finite automata

  • Authors:
  • Luís M. S. Russo;Arlindo L. Oliveira

  • Affiliations:
  • IST / INESC-ID, LISBOA, Portugal;IST / INESC-ID, LISBOA, Portugal

  • Venue:
  • SPIRE'05 Proceedings of the 12th international conference on String Processing and Information Retrieval
  • Year:
  • 2005

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Abstract

We present a new algorithm for generating super condensed neighbourhoods. Super condensed neighbourhoods have recently been presented as the minimal set of words that represent a pattern neighbourhood. These sets play an important role in the generation phase of hybrid algorithms for indexed approximate string matching. An existing algorithm for this purpose is based on a dynamic programming approach, implemented using bit-parallelism. In this work we present a bit-parallel algorithm based on automata which is faster, conceptually much simpler and uses less memory than the existing method.