# Grid Search for Polynomial Kernel

I am trying to do a grid search for a polynomial kernel. I have used the normal grid search on polynomial kernels which is wrong. I only varied $c$ and $\gamma$... but I need to vary $a$ and $b$... Is there any fast method to do grid search for polynomial kernels?

Polynomial kernel: $K(x_i, x_j) = (\gamma x_i x_j + a)^b,\quad \gamma > 0$

Any suggestions or any corrections as well are welcome.

• What is c? There's no c in your equation. Mar 16 '12 at 17:58
• C is the amount of misclassification.... it is for all kernels... Mar 16 '12 at 18:00