Direct Gamma Tuning (DGT): Please refer to the paper (Bibtex):
@article{isla-cernadas24, author = {D. Isla-Cernadas, M. Fern\'andez-Delgado, E. Cernadas, M.S. Sirsat, H. Maarouf, S. Barro}, title = {Closed-form Gaussian spread estimation for small and large support vector classification}, journal = {IEEE Transactions on Neural Networks and Learning Systems}, }
Octave/Matlab code (GNU Lesser General Public License)