Iterative cleaning and learning of big highly-imbalanced fraud data using unsupervised learning

Author:

Kennedy Robert K. L.,Salekshahrezaee Zahra,Villanustre Flavio,Khoshgoftaar Taghi M.

Abstract

AbstractFraud datasets often times lack consistent and accurate labels, and are characterized by having high class imbalance where the number of fraudulent examples are far fewer than those of normal ones. Machine learning designed for effectively detecting fraud is an important task since fraudulent behavior can have significant financial or health consequences, but is presented with significant challenges due to the class imbalance and availability of reliable labels. This paper presents an unsupervised fraud detection method that uses an iterative cleaning process for effective fraud detection. We measure our method performance using a newly created Medicare fraud big dataset and a widely used credit card fraud dataset. Additionally, we detail the process of creating the highly-imbalanced Medicare dataset from multiple publicly available sources, how additional trainable features were added, and how fraudulent labels were assigned for final model performance measurements. The results are compared with two popular unsupervised learners and show that our method outperforms both models in both datasets. Our work achieves a higher AUPRC with relatively few iterations across both domains.

Publisher

Springer Science and Business Media LLC

Subject

Information Systems and Management,Computer Networks and Communications,Hardware and Architecture,Information Systems

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. A clustering-based adaptive undersampling ensemble method for highly unbalanced data classification;Applied Soft Computing;2024-07

2. Autoencoders and their applications in machine learning: a survey;Artificial Intelligence Review;2024-02-03

3. Unsupervised Anomaly Detection of Class Imbalanced Cognition Data Using an Iterative Cleaning Method;2023 IEEE 24th International Conference on Information Reuse and Integration for Data Science (IRI);2023-08

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