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Islam, Md. Shariful; Khreich, Wael; Hamou-Lhadj, Abdelwahab
IEEE transactions on reliability, 2018-March, 2018-3-00, 20180301, Letnik: 67, Številka: 1Journal Article
Ensemble-based anomaly detection systems (ADSs), using Boolean combination, have been shown to reduce the false alarm rate over that of a single detector. However, the existing Boolean combination methods rely on an exponential number of combinations making them impractical, even for a small number of detectors. In this paper, we propose weighted pruning-based Boolean combination, an efficient approach for selecting and combining accurate and diverse anomaly detectors. It works in three phases. The first phase selects a subset of the available base diverse soft detectors by pruning all the redundant soft detectors based on a weighted version of Cohen's kappa measure of agreement. The second phase selects a subset of diverse and accurate crisp detectors from the base soft detectors (selected in Phase1) based on the unweighted kappa measure. The selected complementary crisp detectors are then combined in the final phase using Boolean combinations. The results on two large scale datasets show that the proposed weighted pruning approach is able to maintain and even improve the accuracy of existing Boolean combination techniques, while significantly reducing the combination time and the number of detectors selected for combination.
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