For SVM, what is the difference between gamma and sigma in the kernel scale for rbf?

In some places the kernel scale is defined with gamma, and others sigma. Are the two the same?

Answer 1

[Mudambi Srivatsa]

Yes, they are the same. Refer to the following post for more information:

https://www.mathworks.com/matlabcentral/answers/96276-how-does-svmtrain-determine-polynomial-and-rbf-kernel-parameters-gamma-c-in-the-bioinformatics-too

This parameter was referred to as 'RBF_sigma' in documentation of "svmtrain" function. However, it is replaced by "fitcsvm" which has a 'KernelScale' parameter.