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

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Akshar Agarwal
Akshar Agarwal on 23 Jun 2017
Edited: Walter Roberson on 8 Dec 2021
In some places the kernel scale is defined with gamma, and others sigma. Are the two the same?

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Answers (1)

Mudambi Srivatsa
Mudambi Srivatsa on 26 Jun 2017
Edited: Walter Roberson on 8 Dec 2021
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.

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