Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/75883
Title: Positive and unlabeled learning for anomaly detection
Authors: Zhang, Jiaqi
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Zhang, J. (2018). Positive and unlabeled learning for anomaly detection. Master's thesis, Nanyang Technological University, Singapore.
Abstract: Anomaly detection is of great interest to big data applications but still remains a challenging problem for machine learning-based methods. For unsupervised learning, the performance may not be satisfactory due to the lack of label information while for supervised learning, it is difficult to acquire labeled anomaly data for training which is usually rare and diversely distributed. To address the challenge, we propose a hybrid solution by applying Positive and Unlabeled (PU) Learning for anomaly detection problem. As a semi-supervised method, only normal (positive) data and unlabeled data (could be positive or negative) are required by the proposed method for anomaly detection. We start by using a linear model to extract the most reliable negative instances followed by an iterative self-learning process to update the classifier with different speeds based on the estimated positive class prior. Our proposed method is verified on several benchmark datasets and outperforms existing methods under different experiment settings.
URI: http://hdl.handle.net/10356/75883
DOI: 10.32657/10356/75883
Schools: School of Electrical and Electronic Engineering 
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Theses

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