Hi Ema, if you take a look at the binary2multiclass meta operator, there's a parameter to specify the method. You might choose between one vs all or one vs one (pairwise). Additionally there are some more complex, from information theory inspired methods.
If you use the LibSVM, it internally uses one vs all, as far as I know.
Hi, javascript:void(0); thank you very much for ur reponse , i used libsvm so if it has 4 classes it does one vs all for every class and takes the average am i right?
Answers
if you take a look at the binary2multiclass meta operator, there's a parameter to specify the method. You might choose between one vs all or one vs one (pairwise). Additionally there are some more complex, from information theory inspired methods.
If you use the LibSVM, it internally uses one vs all, as far as I know.
Greetings,
Sebastian
thank you very much for ur reponse , i used libsvm
so if it has 4 classes
it does one vs all for every class and takes the average am i right?
Thanx in advance
although I'm not familiar with the internals of the LibSVM, I think this is exactly what it is doing.
Greetings,
Sebastian