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Fast and Scalable Outlier Detection with Approximate Nearest Neighbor Ensembles

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Database Systems for Advanced Applications (DASFAA 2015)

Part of the book series: Lecture Notes in Computer Science ((LNISA,volume 9050))

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Abstract

Popular outlier detection methods require the pairwise comparison of objects to compute the nearest neighbors. This inherently quadratic problem is not scalable to large data sets, making multidimensional outlier detection for big data still an open challenge. Existing approximate neighbor search methods are designed to preserve distances as well as possible. In this article, we present a highly scalable approach to compute the nearest neighbors of objects that instead focuses on preserving neighborhoods well using an ensemble of space-filling curves. We show that the method has near-linear complexity, can be distributed to clusters for computation, and preserves neighborhoods—but not distances—better than established methods such as locality sensitive hashing and projection indexed nearest neighbors. Furthermore, we demonstrate that, by preserving neighborhoods, the quality of outlier detection based on local density estimates is not only well retained but sometimes even improved, an effect that can be explained by relating our method to outlier detection ensembles. At the same time, the outlier detection process is accelerated by two orders of magnitude.

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Authors and Affiliations

  1. Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538, München, Germany

    Erich Schubert, Arthur Zimek & Hans-Peter Kriegel

Authors
  1. Erich Schubert
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  2. Arthur Zimek
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  3. Hans-Peter Kriegel
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Corresponding author

Correspondence to Erich Schubert .

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Editors and Affiliations

  1. Universität München, München, Germany

    Matthias Renz

  2. University of Southern California, Los Angeles, USA

    Cyrus Shahabi

  3. University of Queensland, Brisbane, Australia

    Xiaofang Zhou

  4. Monash University, Clayton, Australia

    Muhammad Aamir Cheema

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Schubert, E., Zimek, A., Kriegel, HP. (2015). Fast and Scalable Outlier Detection with Approximate Nearest Neighbor Ensembles. In: Renz, M., Shahabi, C., Zhou, X., Cheema, M. (eds) Database Systems for Advanced Applications. DASFAA 2015. Lecture Notes in Computer Science(), vol 9050. Springer, Cham. https://doi.org/10.1007/978-3-319-18123-3_2

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  • DOI: https://doi.org/10.1007/978-3-319-18123-3_2

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-18122-6

  • Online ISBN: 978-3-319-18123-3

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