Approximating edit distance in near-linear time

  • Authors:
  • Alexandr Andoni;Krzysztof Onak

  • Affiliations:
  • MIT, Cambridge, MA, USA;MIT, Cambridge, MA, USA

  • Venue:
  • Proceedings of the forty-first annual ACM symposium on Theory of computing
  • Year:
  • 2009

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Abstract

We show how to compute the edit distance between two strings of length n up to a factor of 2(O-tilde(sqrt(log n))) in n(1+o(1)) time. This is the first sub-polynomial approximation algorithm for this problem that runs in near-linear time, improving on the state-of-the-art n(1/3+o(1)) approximation. Previously, approximation of 2Õ √log n) was known only for embedding edit distance into l1, and it is not known if that embedding can be computed in less than a quadratic time.