Local weighted LS-SVM online modeling and the application in continuous processes

Abstract

For continuous processes, the global LSSVM always gives good prediction for testing data located in the neighborhood of dense training data but incompetent for these in the sparse part. To solve the problem, the paper proposed a local weighted LSSVM method in the online modeling of continuous processes. At each period, only the samples similar to the current input are added into the training set and the obtained model is just for predicting the current output. To distinguish the importance of the training data, weight is defined to each data according to the Euclidean distances between the training data and testing data. The presented algorithm is applied in pH neutralization process and the result shows the excellent performance of the presented algorithm in precision and predicting time. © 2010 Springer-Verlag.