I am trying to solve a problem with Libsvm in Rapidminer. During X-validation in ordrer to find the best combination of SVM parameters, I have logged the C, Gamma, and accuracy measure and deviation. There are lot of parameters combination that leads to best accuracy and least deviation but after applying model on test data they will lead to very different answers. Is there any way to plot a contour of cross-validation accuracy like the one which is available in libsvm site (http://www.csie.ntu.edu.tw/~cjlin/libsvm/)?
Or is there a way to select the best parameter combination?