Outlier detection is one of the hot topics in the field of machine learning and data mining. At present, there are many kinds of outlier detection algorithms. The accuracies of traditional outlier detection algorithms are often affected by unique parameters, and an increase in the amount of data and the dimensions of the data can seriously affect their efficiency and effectiveness. Methods based on generative adversarial networks (GANs) can solve the above problems, but they are unacceptable since the model often collapses during the training period. In this paper, to solve the problems of curse of dimensionality and model collapse, we propose a novel reinforced noise discriminator (RND) method for unsupervised outlier detection in tabular data. We consider outlier detection as a binary classification problem. Thus, we apply a learnable reinforced discriminator and generate a large number of potential outliers with a uniform distribution and potential outliers that are close to the original data that are used as a negative sample to train the discriminator, which learns the distribution of the original data to detect outliers. We empirically compare the proposed approach with ten state-of-the-art outlier detection methods on both synthetic and real-world tabular datasets. The experimental results show that RND outperforms its competitors in the majority of cases. The codes used to perform the experiments described in this paper are available at https://github.com/urlhearts/r-n-d .

Zhongping Zhang

Daoheng Liu

Jinwei Zhu

Youxi Wu

ACM Transactions on Intelligent Systems and Technology

ACM TRANSACTIONS ON INTELLIGENT SYSTEMS AND TECHNOLOGY 是一本学术期刊，以多学科的视角发表关于智能系统、适用算法和技术的最高质量论文。智能系统是使用人工智能 (AI) 技术提供重要服务（例如，作为更大系统的组件）以允许集成系统在现实世界中感知、推理、学习和智能行动的系统。ACM TIST 是每季出版（一年六期）。每期有 8-11 篇常规论文，大约有 20 个已发表的期刊页面或每篇论文 10,000 字。额外的参考文献、证明、图表或详细的实验结果可以作为单独的附录提交，而过长的论文将被自动拒绝。作者可以在其已发表论文的其他内容中包含仅在线附录，并鼓励与其他读者共享其代码和/或数据。

ACM Transactions on Intelligent Systems and Technology is an academic journal that publishes high-quality papers on intelligent systems, applicable algorithms, and technologies from a multidisciplinary perspective. Intelligent systems use artificial intelligence (AI) technologies to provide essential services, functioning as components of larger systems, enabling integrated systems to perceive, reason, learn, and act intelligently in the real world. ACM TIST is published quarterly, with six issues per year, each containing 8 to 11 regular papers, approximately 20 published journal pages, or up to 10,000 words per paper. Additional references, proofs, charts, or detailed experimental results may be submitted as separate appendices, and excessively long papers will be automatically rejected. Authors are allowed to include online-only appendices in their published papers and are encouraged to share their code and/or data with other readers.

《ACM Transactions on Intelligent Systems and Technology》是一本学术期刊，采用多学科的视角，发表关于智能系统、相关算法和技术的高质量论文。智能系统利用人工智能（AI）技术提供重要服务，作为更大系统的组成部分，使得集成系统能够在现实世界中进行感知、推理、学习和智能行动。该期刊每季度出版六期，每期包含8到11篇常规论文，约20页的已发表期刊内容，或每篇论文不超过10,000字。额外的参考文献、证明、图表或详细的实验结果可以作为附录提交，过长的论文将被自动拒绝。作者可以在已发表论文中包含仅在线附录，并鼓励与其他读者共享其代码和/或数据。

Category	Quartile
计算机科学	4
计算机科学, 计算机人工智能	4
计算机科学, 计算机信息系统	4

Unsupervised Outlier Detection with Reinforced Noise Discriminator

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Category	Quartile
COMPUTER SCIENCE, INFORMATION SYSTEMS	1