Comparison Studies of LS_SVM and SVM on Modeling for Fermentation Processes

The SVM needs use approximation accuracy ¿, however the LS_SVM (least square support vector machine) doesn´t need ¿. According to these characteristics, this paper studies the fitting and generalization capabilities of models that LS_SVM and SVM establishes for the penicillin fermentation processes respectively. An improved GA selects the parameter values for LS_SVM and SVM respectively. The experiment shows the model based on LS_SVM possesses the strong capabilities of fitting and generalization. If ¿ is too large, the capabilities of fitting and generalization of model based on SVM are not high; if ¿ is too small, the capabilities of fitting and generalization are relatively high, but the modeling process demands more long time. So, the LS_SVM is more suitable for modeling in fermentation processes.