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Probabilistic slow feature analysis‐based representation learning from massive process data for soft sensor modeling
Author(s) -
Shang Chao,
Huang Biao,
Yang Fan,
Huang Dexian
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14937
Subject(s) - probabilistic logic , representation (politics) , process (computing) , soft sensor , latent variable , variable (mathematics) , data mining , feature (linguistics) , computer science , latent variable model , machine learning , quality (philosophy) , artificial intelligence , mathematics , algorithm , mathematical analysis , linguistics , philosophy , epistemology , politics , political science , law , operating system
Latent variable (LV) models provide explicit representations of underlying driving forces of process variations and retain the dominant information of process data. In this study, slow features (SFs) as temporally correlated LVs are derived using probabilistic SF analysis. SFs evolving in a state‐space form effectively represent nominal variations of processes, some of which are potentially correlated to quality variables and hence help improving the prediction performance of soft sensors. An efficient expectation maximum algorithm is proposed to estimate parameters of the probabilistic model, which turns out to be suitable for analyzing massive process data. Two criteria are also proposed to select quality‐relevant SFs. The validity and advantages of the proposed method are demonstrated via two case studies. © 2015 American Institute of Chemical Engineers AIChE J , 61: 4126–4139, 2015