Parameter tuning for SVM

 

Hello,

      I have a very basic question. I am doing one vs one SVM classification with 5 different classes. For that I am using RBF Kernel method having two tuning parameters C and gamma. My question is that do we have to select one value of C and gamma for all pair of classes or every pair will have their unique C and unique gamma value based on some validation method?

 

Thanks 

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