GPU-based exhaustive algorithms processing kNN queries

Abstract

Efficient kNN search, or k-nearest neighbors search, is useful, among other fields, in multimedia information retrieval, data mining and pattern recognition problems. A distance function determines how similar the objects are to a given kNN query object. As finding the distance between any given pair of objects (i.e., high-dimensional vectors) is known to be a computationally expensive operation, using parallel computation techniques is an effective way of reducing running times to acceptable values in large databases. In the present work, we offer novel GPU approaches to solving kNN (k-nearest neighbor) queries using exhaustive algorithms based on the Selection Sort, Quicksort and state-of-the-art algorithms. We show that the best approach depends on the k value of the kNN query and achieve a speedup up to 86.4\(\times \) better than the sequential counterpart. We also propose a multi-core algorithm to be used as reference for the experiments and a hybrid algorithm which combines the proposed algorithms with a state-of-the-art heaps-based method, in which the best performance is obtained with high k values. We also extend our algorithms to be able to deal with large databases that do not fit in GPU memory and whose performance does not deteriorate as database size increases.

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Notes

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    This programmer control is larger when using the SRAM mainly as a software-controlled memory, but hardware-controlled cache must also be taken into account during the mapping.

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Acknowledgements

This research was supported by the Project of the Universidad Católica del Maule (Chile) “Plan de Desarrollo Anual Facultad de Ingeniería. Convenio de Desempeño” and by the European Commission (FEDER) and Junta de Comunidades de Castilla-La Mancha under the project PEII-2014-028-P. Powered@NLHPC: This research was partially supported by the supercomputing infrastructure of the NLHPC (ECM-02).

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Correspondence to Ricardo J. Barrientos.

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Barrientos, R.J., Millaguir, F., Sánchez, J.L. et al. GPU-based exhaustive algorithms processing kNN queries. J Supercomput 73, 4611–4634 (2017). https://doi.org/10.1007/s11227-017-2110-y

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Keywords

  • kNN
  • Quicksort
  • Selection Sort
  • GPU
  • Exhaustive algorithms