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DOI: 10.4230/LIPIcs.ICALP.2016.20
URN: urn:nbn:de:0030-drops-62992
URL: http://drops.dagstuhl.de/opus/volltexte/2016/6299/
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Clifford, RaphaŽl ; Starikovskaya, Tatiana

Approximate Hamming Distance in a Stream

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LIPIcs-ICALP-2016-20.pdf (0.5 MB)


Abstract

We consider the problem of computing a (1+epsilon)-approximation of the Hamming distance between a pattern of length n and successive substrings of a stream. We first look at the one-way randomised communication complexity of this problem. We show the following: - If Alice and Bob both share the pattern and Alice has the first half of the stream and Bob the second half, then there is an O(epsilon^{-4}*log^2(n)) bit randomised one-way communication protocol. - If Alice has the pattern, Bob the first half of the stream and Charlie the second half, then there is an O(epsilon^{-2}*sqrt(n)*log(n)) bit randomised one-way communication protocol. We then go on to develop small space streaming algorithms for (1 + epsilon)-approximate Hamming distance which give worst case running time guarantees per arriving symbol. - For binary input alphabets there is an O(epsilon^{-3}*sqrt(n)*log^2(n)) space and O(epsilon^{-2}*log(n)) time streaming (1 + epsilon)-approximate Hamming distance algorithm. - For general input alphabets there is an O(epsilon^{-5}*sqrt(n)*log^4(n)) space and O(epsilon^{-4}*log^3(n)) time streaming (1 + epsilon)-approximate Hamming distance algorithm.

BibTeX - Entry

@InProceedings{clifford_et_al:LIPIcs:2016:6299,
  author =	{Rapha{\"e}l Clifford and Tatiana Starikovskaya},
  title =	{{Approximate Hamming Distance in a Stream}},
  booktitle =	{43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)},
  pages =	{20:1--20:14},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-013-2},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{55},
  editor =	{Ioannis Chatzigiannakis and Michael Mitzenmacher and Yuval Rabani and Davide Sangiorgi},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2016/6299},
  URN =		{urn:nbn:de:0030-drops-62992},
  doi =		{10.4230/LIPIcs.ICALP.2016.20},
  annote =	{Keywords: Hamming distance, communication complexity, data stream model}
}

Keywords: Hamming distance, communication complexity, data stream model
Seminar: 43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)
Issue Date: 2016
Date of publication: 17.08.2016


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