A note on element-wise matrix sparsification via a matrix-valued Bernstein inequality

  • Authors:
  • Petros Drineas;Anastasios Zouzias

  • Affiliations:
  • Department of Computer Science, Rensselaer Polytechnic Institute, United States;Department of Computer Science, University of Toronto, Canada

  • Venue:
  • Information Processing Letters
  • Year:
  • 2011

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Abstract

Given a matrix A@?R^n^x^n, we present a simple, element-wise sparsification algorithm that zeroes out all sufficiently small elements of A and then retains some of the remaining elements with probabilities proportional to the square of their magnitudes. We analyze the approximation accuracy of the proposed algorithm using a recent, elegant non-commutative Bernstein inequality, and compare our bounds with all existing (to the best of our knowledge) element-wise matrix sparsification algorithms.