Neural Architecture refers to the structural design and arrangement of components within a neural network. Neural networks, inspired by the structure and functioning of the human brain, consist of interconnected nodes organized into layers. The architecture defines the layout, connections, and flow of information through the network, influencing its ability to learn and make predictions.

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AutoOD: Neural Architecture Search for Outlier Detection

AutoOD: Neural Architecture Search for Outlier Detection Outlier detection is an important data mining task with numerous applications such as intrusion detection, credit card fraud detection, and video surveillance. However, given a specific task with complex data, the process of building an effective deep learning based system for outlier detection still highly relies on human expertise and laboring trials. Moreover, while Neural Architecture Search (NAS) has shown its promise in discovering effective deep architectures in various domains, such as image classification, object detection and semantic segmentation, contemporary NAS methods are not suitable for outlier detection due to the lack of intrinsic search space and low sample efficiency. To bridge the gap, in this paper, we propose AutoOD, an automated outlier detection framework, which aims to search for an optimal neural network model within a predefined search space. Specifically, we introduce an experience replay mechanism based on self-imitation learning to improve the sample efficiency. Experimental results on various real-world benchmark datasets demonstrate that the deep model identified by AutoOD achieves the best performance, comparing with existing handcrafted models and traditional search methods.