3DACN: 3D Augmented convolutional network for time series data

• Published in: Information sciences 2020-03, Vol.513, p.17-29
• Main Authors: Pei, Songwen, Shen, Tianma, Wang, Xianrong, Gu, Chunhua, Ning, Zhong, Ye, Xiaochun, Xiong, Naixue
• Format: Article
• Language: English
• Subjects: Augmented algorithm; Convolutional neural network; Expectation-maximization algorithm; Gated recurrent units; Time series data
• ISSN: 0020-0255; 1872-6291
• DOI: 10.1016/j.ins.2019.11.040

Time series data and non-time series data are increasing in the credit system of financial market, so that an effective and intelligent data mining model plays a critical role to analyze hybrid time series data. In addition, traditional mining models sometimes fail to converge because of imbalanced data problem. Therefore, we propose a 3D Augmented Convolutional Network (3DACN) to extract time series information and solve the serious imbalanced data problem. By using the augmented algorithm on time series data, hybrid time series data are enlarged to generate more examples on the minority classes. 3DACN ensures the latent variables with an Expectation-Maximization(EM) algorithm to improve F1 score (F1) and Area Under Curve (AUC). Experimental results show that in the benchmark of Bank database, it can gain F1 score by 81.1% and the AUC by 88.2% respectively; while in the benchmark of Credit Risk database, the 3DACN can reach high performance on F1 score by 88.1% and the AUC by 88.4%.