SVM Multiclass text classification

Question

Hi

I want to classfy News data set and training data are classified with IPTC subject code(Hierarchical classification). In my project I should use svm .

I have done all of feature extraction ,stemming,removing stop word ...

I almost have the file format required for svm multiclass :

which is like:

category  feature:value feature:value feature:value

I don't know how I should use svmmulticlass

I have also hearde about one -against-all ,I dont know what it is

please tell me whrere i can find some tutorial about it ,or how to use it

Regards

Answer 1

Nobody have a comment or recommend any thing?

Answer 2

You should probably start by reading A Practical Guide to Support Vector Classification

One against all is a method to convert an SVM (a natural method for 2-class classification) into multiclass classifier.