Partial transfer learning network for data imputation and soft sensor under various operation conditions
Jia-yi Ren , Xu Chen , Chun-hui Zhao
Journal of Central South University ›› 2023, Vol. 30 ›› Issue (10) : 3395 -3413.
Partial transfer learning network for data imputation and soft sensor under various operation conditions
Soft sensor plays a key role in the safe operation of industrial processes and product quality control. In industrial processes, the switching of operation conditions may lead to distribution discrepancy and dimension inconsistency between the training data (source domain) and testing data (target domain), leading to the soft sensor model mismatch problem. In addition, the data may be incomplete because of sensor transmission failure, where the missing values may influence the accuracy of the soft sensor. This article introduces a partial transfer learning network (PTL-Net) for soft sensors under different operation conditions with missing data. First, the imputation and soft sensor modules are constructed for source domain data, where a compactness loss is designed to induce feature aggregation to alleviate the influence of abnormal features mapped from missing data. Then a partial transfer strategy is proposed to reduce the distribution discrepancy between the source and target data. Furthermore, the proposed strategy selects the common components between two domains for partial knowledge transfer rather than inheriting all the parameters directly, which can overcome the model mismatch problem. The effectiveness of PTL-Net is verified under the nuclear dataset and the three-phase flow process.
partial transfer / various operation conditions / dimension inconsistency / missing data / soft sensor
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