On locality-sensitive indexing in generic metric spaces

  • Authors:
  • David Novak;Martin Kyselak;Pavel Zezula

  • Affiliations:
  • Masaryk University Brno, Czech republic;Masaryk University Brno, Czech republic;Masaryk University Brno, Czech republic

  • Venue:
  • Proceedings of the Third International Conference on SImilarity Search and APplications
  • Year:
  • 2010

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Abstract

The concept of Locality-sensitive Hashing (LSH) has been successfully used for searching in high-dimensional data and a number of locality-preserving hash functions have been introduced. In order to extend the applicability of the LSH approach to a general metric space, we focus on a recently presented Metric Index (M-Index), we redefine its hashing and searching process in the terms of LSH, and perform extensive measurements on two datasets to verify that the M-Index fulfills the conditions of the LSH concept. We widely discuss "optimal" properties of LSH functions and the efficiency of a given LSH function with respect to kNN queries. The results also indicate that the M-Index hashing and searching is more efficient than the tested standard LSH approach for Euclidean distance.