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

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 ?

Answer 1

[Ayush Anand]

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!