Default Value for LibSVM Cost Parameter C wrong?
Hi,
I am using Rapidminer within a text mining two-class classification project. The experiment also includes a SVM learner (i.e. LibSVM).
I noticed that the default value for the cost parameter C is zero (0) within Rapidminer.
An article* by the developers of LibSVM, however, states that C "must" be larger than zero “C > 0” (p. 2). Now my question: Is it simply wrong to use C = 0 and what implications might it have to do so? Why was the default value set to zero or is it not zero in fact?
Thank you very much for your support.
* A Practical Guide to Support Vector Classifciation (http://www.csie.ntu.edu.tw/~cjlin/papers/guide/guide.pdf)
I am using Rapidminer within a text mining two-class classification project. The experiment also includes a SVM learner (i.e. LibSVM).
I noticed that the default value for the cost parameter C is zero (0) within Rapidminer.
An article* by the developers of LibSVM, however, states that C "must" be larger than zero “C > 0” (p. 2). Now my question: Is it simply wrong to use C = 0 and what implications might it have to do so? Why was the default value set to zero or is it not zero in fact?
Thank you very much for your support.
* A Practical Guide to Support Vector Classifciation (http://www.csie.ntu.edu.tw/~cjlin/papers/guide/guide.pdf)