Learning representations of ultrahigh-dimensional data for random distance-based outlier detection
Learning expressive low-dimensional representations of ultrahigh-dimensional data, e.g., data with thousands/millions of features, has been a major way to enable learning methods to address the curse of dimensionality. However, existing unsupervised representation learning methods mainly focus on pr...
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sg-smu-ink.sis_research-81442022-04-22T04:21:40Z Learning representations of ultrahigh-dimensional data for random distance-based outlier detection PANG, Guansong CAO, Longbing CHEN, Ling LIAN, Defu LIU, Huan Learning expressive low-dimensional representations of ultrahigh-dimensional data, e.g., data with thousands/millions of features, has been a major way to enable learning methods to address the curse of dimensionality. However, existing unsupervised representation learning methods mainly focus on preserving the data regularity information and learning the representations independently of subsequent outlier detection methods, which can result in suboptimal and unstable performance of detecting irregularities (i.e., outliers).This paper introduces a ranking model-based framework, called RAMODO, to address this issue. RAMODO unifies representation learning and outlier detection to learn low-dimensional representations that are tailored for a state-of-the-art outlier detection approach - the random distance-based approach. This customized learning yields more optimal and stable representations for the targeted outlier detectors. Additionally, RAMODO can leverage little labeled data as prior knowledge to learn more expressive and application-relevant representations. We instantiate RAMODO to an efficient method called REPEN to demonstrate the performance of RAMODO.Extensive empirical results on eight real-world ultrahigh dimensional data sets show that REPEN (i) enables a random distance-based detector to obtain significantly better AUC performance and two orders of magnitude speedup; (ii) performs substantially better and more stably than four state-of-the-art representation learning methods; and (iii) leverages less than 1% labeled data to achieve up to 32% AUC improvement. 2018-08-01T07:00:00Z text application/pdf https://ink.library.smu.edu.sg/sis_research/7141 info:doi/10.1145/3219819.3220042 https://ink.library.smu.edu.sg/context/sis_research/article/8144/viewcontent/11692_Article_Text_15220_1_2_20201228.pdf http://creativecommons.org/licenses/by-nc-nd/4.0/ Research Collection School Of Computing and Information Systems eng Institutional Knowledge at Singapore Management University Databases and Information Systems Data Storage Systems |
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Databases and Information Systems Data Storage Systems PANG, Guansong CAO, Longbing CHEN, Ling LIAN, Defu LIU, Huan Learning representations of ultrahigh-dimensional data for random distance-based outlier detection |
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Learning expressive low-dimensional representations of ultrahigh-dimensional data, e.g., data with thousands/millions of features, has been a major way to enable learning methods to address the curse of dimensionality. However, existing unsupervised representation learning methods mainly focus on preserving the data regularity information and learning the representations independently of subsequent outlier detection methods, which can result in suboptimal and unstable performance of detecting irregularities (i.e., outliers).This paper introduces a ranking model-based framework, called RAMODO, to address this issue. RAMODO unifies representation learning and outlier detection to learn low-dimensional representations that are tailored for a state-of-the-art outlier detection approach - the random distance-based approach. This customized learning yields more optimal and stable representations for the targeted outlier detectors. Additionally, RAMODO can leverage little labeled data as prior knowledge to learn more expressive and application-relevant representations. We instantiate RAMODO to an efficient method called REPEN to demonstrate the performance of RAMODO.Extensive empirical results on eight real-world ultrahigh dimensional data sets show that REPEN (i) enables a random distance-based detector to obtain significantly better AUC performance and two orders of magnitude speedup; (ii) performs substantially better and more stably than four state-of-the-art representation learning methods; and (iii) leverages less than 1% labeled data to achieve up to 32% AUC improvement. |
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text |
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PANG, Guansong CAO, Longbing CHEN, Ling LIAN, Defu LIU, Huan |
author_facet |
PANG, Guansong CAO, Longbing CHEN, Ling LIAN, Defu LIU, Huan |
author_sort |
PANG, Guansong |
title |
Learning representations of ultrahigh-dimensional data for random distance-based outlier detection |
title_short |
Learning representations of ultrahigh-dimensional data for random distance-based outlier detection |
title_full |
Learning representations of ultrahigh-dimensional data for random distance-based outlier detection |
title_fullStr |
Learning representations of ultrahigh-dimensional data for random distance-based outlier detection |
title_full_unstemmed |
Learning representations of ultrahigh-dimensional data for random distance-based outlier detection |
title_sort |
learning representations of ultrahigh-dimensional data for random distance-based outlier detection |
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Institutional Knowledge at Singapore Management University |
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2018 |
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https://ink.library.smu.edu.sg/sis_research/7141 https://ink.library.smu.edu.sg/context/sis_research/article/8144/viewcontent/11692_Article_Text_15220_1_2_20201228.pdf |
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