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KAGO: an approximate adaptive grid-based outlier detection approach using kernel density estimate

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Abstract

Outlier detection approaches show their efficacy while extracting unforeseen knowledge in domains such as intrusion detection, e-commerce, and fraudulent transactions. A prominent method like the K-Nearest Neighbor (KNN)-based outlier detection (KNNOD) technique relies on distance measures to extract the anomalies from the dataset. However, KNNOD is ill-equipped to deal with dynamic data environment efficiently due to its quadratic time complexity and sensitivity to changes in the dataset. As a result, any form of redundant computation due to frequent updates may lead to inefficiency while detecting outliers. In order to address these challenges, we propose an approximate adaptive grid-based outlier detection technique by finding point density using kernel density estimate (KAGO) instead of any distance measure. The proposed technique prunes the inlier grids and filters the candidate grids with local outliers upon a new point insertion. The grids containing potential outliers are aggregated to converge on to at most top-N global outliers incrementally. Experimental evaluation showed that KAGO outperformed KNNOD by more than an order of \(\approx\)3.9 across large relevant datasets at about half the memory consumption.

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Notes

  1. In this paper, we use the term anomaly and outlier interchangeably.

  2. Base dataset refers to the dataset before any change is inflicted upon it.

  3. The density at a point here signifies the local density since it is computed wrt. (with respect to) the grid cell behaving as local neighborhood of the concerned point. We use the term density and local density interchangeably while describing concepts related to the KAGO algorithm.

  4. Kernel centers are data points sampled from input dataset. A detailed definition of kernel center is presented in Sect. 2.

  5. The point within \(g_{c}\) where each co-ordinate in a given dimension is the minimum of all the current points \(\in g_{c}\) in that dimension.

  6. The point within \(g_{c}\) where each co-ordinate in a given dimension is the maximum of all the current points \(\in g_{c}\) in that dimension.

  7. Post entry of new point, any grid previously a part of COG might not be a part of it anymore.

  8. With repeated insertions, the number of existing outliers may be less than N.

  9. Please refer to the file ‘KAGO_SVDD_comparison.pdf‘ for further details.

  10. https://nlp.stanford.edu/IR-book/html/htmledition/.

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Authors and Affiliations

  1. Department of Computer Science and Engineering, Indian Institute of Technology Guwahati, North Guwahati, Amingaon, Pin-781039, Assam, India

    Panthadeep Bhattacharjee & Pinaki Mitra

  2. Amazon Development Center, 26/1 Brigade Gateway, Dr Rajkumar Rd, Malleshwaram, Bangaluru, Pin-560055, Karnataka, India

    Ankur Garg

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  1. Panthadeep Bhattacharjee
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  2. Ankur Garg
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  3. Pinaki Mitra
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Correspondence to Panthadeep Bhattacharjee.

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Bhattacharjee, P., Garg, A. & Mitra, P. KAGO: an approximate adaptive grid-based outlier detection approach using kernel density estimate. Pattern Anal Applic 24, 1825–1846 (2021). https://doi.org/10.1007/s10044-021-00998-6

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