Tight lower bound for linear sketches of moments

  • Authors:
  • Alexandr Andoni;Huy L. Nguyễn;Yury Polyanskiy;Yihong Wu

  • Affiliations:
  • Microsoft Research SVC;Princeton U;MIT;UIUC

  • Venue:
  • ICALP'13 Proceedings of the 40th international conference on Automata, Languages, and Programming - Volume Part I
  • Year:
  • 2013

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Abstract

The problem of estimating frequency moments of a data stream has attracted a lot of attention since the onset of streaming algorithms [AMS99]. While the space complexity for approximately computing the pth moment, for p∈(0,2] has been settled [KNW10], for p2 the exact complexity remains open. For p2 the current best algorithm uses O(n1−2/plogn) words of space [AKO11,BO10], whereas the lower bound is of Ω(n1−2/p) [BJKS04]. In this paper, we show a tight lower bound of Ω(n1−2/plogn) words for the class of algorithms based on linear sketches, which store only a sketch Ax of input vector x and some (possibly randomized) matrix A. We note that all known algorithms for this problem are linear sketches.