Cost-oriented LSTM methods for possible expansion of control charting signals

• Published in: Computers & industrial engineering 2021-04, Vol.154, p.107163, Article 107163
• Main Author: Ünlü, Ramazan
• Format: Article
• Language: English
• Subjects: Control Charts; LSTM; Pattern Recognition; SVM; WSVM
• ISSN: 0360-8352; 1879-0550
• DOI: 10.1016/j.cie.2021.107163

•We have proposed a Cost-Sensitive LSTM approach for CCPR systems.•We have applied a simple but effective early detection performance scheme.•Proposed approach outperforms well-known SVM and WSVM methods in CCPRs studies.•Cost-Sensitive LSTM approach detects abnormal patterns earlier than SVM and WSVM. Manual quality control may result in delayed detection of a system defect, or none at all, potentially resulting in malfunctions that can lead to disruption of the system, incur extra costs, or complete downtime of the system. To mitigate such issues, more advanced statistics and machine learning-based systems such as SVM, WSVM, etc. are used to automatically detect error signals during the process. However, these methodologies are not developed for sequential dataset such as a classical CCPR dataset. As a result, in this study, we have implemented a preliminary Cost-Oriented Long-Short Term Memory (LSTM), which is designed to learn from a sequential dataset and compare it with SVM and WSVM which are traditional methods utilized in the field. Additionally, we compared the performance of methods in terms of early detection of an abnormal pattern. Based on the findings, the Cost-Oriented LSTM method outperforms SVM and WSVM in the majority of abnormal patterns in terms of both classification and early detection performance. Global accuracy score which is the average of accuracy rates in all combination of abnormal parameters and window lengths shows that LSTM gives a better accuracy score than SVM and WSVM in all seven abnormal patterns detection.