Journal
2020 4TH INTERNATIONAL CONFERENCE ON COMPUTATIONAL INTELLIGENCE AND NETWORKS (CINE 2020)
Volume -, Issue -, Pages -Publisher
IEEE
DOI: 10.1109/CINE48825.2020.234401
Keywords
LOF; INFLO; Outlier Detection; Reverse nearest neighbor Distance Factor (RDF); Reverse Nearest Neighbor Statistics based Outlier Detection (RSOD)
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Funding
- project Information Security Education and Awareness (ISEA) - PhaseII. The Ministry of Electronics Information Technology (MeitY), Government of India
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Unsupervised learning techniques arc popular in detecting outliers in various domains. Many parametric and non-parametric outlier detection approaches have been proposed over the last decades. The existing neighborhood-based non-parametric unsupervised approaches like LOF, symmetric neighborhood, LDOF are proven to be effective when outliers are in a region of variable density. However, these techniques wrongly treat an outlier point as inlier in certain scenarios (outlier located between a dense cluster and close to a sparse cluster). In this work, we address this problem by exploiting the information of k-nearest neighbors and reverse nearest neighbors efficiently. We conducted experiments with synthetic, and four real-world datasets, and our proposed technique outperforms popular symmetric neighborhood, LDOF, LOF techniques, and recently introduced RDOS.
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