What is the right formula for the RBF 'KernelScale' of fitcsvm?

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Sofiane Kharbech
Sofiane Kharbech 2018-5-4
编辑： Ayush Anand 2024-1-12
RBF kernel function is defined as exp(-1/(2*sigma^2) ....
The option 'KernelScale' of the Matlab function fitcsvm, does it refer to sigma, sigma^2, 2*sigma^2, or sqrt(2)*sigma ?

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Ayush Anand
Ayush Anand 2024-1-12
编辑：Ayush Anand 2024-1-12
Hi,
The RBF kernel function is defined as :
The "KernelScale" option in the function "fitcsvm" refers to σ (sigma) in the above equation.
You can read more through the definition of parameters of the "fitcsvm" function here:
https://www.mathworks.in/help/stats/fitcsvm.html
Hope this helps!

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