Wuming Gong wrote: > Dear list, > > In some places (for example, > http://en.wikipedia.org/wiki/Support_vector_machine) , the polynomail > kernel in SVM is written as (u'*v + 1)^d, while in the document of > svm() in e1071 package, the polynomial kernel is written as > (gamma*u'*v + coef0)^d. I am a little confused here: > > When doing parameter optimization (grid search or so) for polynomial > kernel, does it need to tune four parameters, gamma, coef0, C and > degree, or just two of them, C and degree (and fixing gamma to 1 and > coef0 = 1)?
All of them, unless you know reasonable values, but that's very improbable. Uwe Ligges > > Thanks, > > Wuming > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
