I am working on LibSVM classifier and Weka in java and I want to get the support vector which results from the training.
So, can anybody tell me how to get the support vector using java code?
This is a snapshot of my code:
LibSVM classifier = new LibSVM();
Instances instsTrain = new Instances(new FileReader("Train.arff"));
instsTrain.setClassIndex(instsTrain.numAttributes() - 1);
classifier.buildClassifier(instsTrain);
the result of that code was
optimization finished, #iter = 34
nu = 0.9733207501211705
obj = -47.33334391005496, rho = 0.33325162948067544
nSV = 50, nBSV = 46
Total nSV = 137
And nSV is the number of the Support Vector, but i cant get the data of the Support Vector.
Thanks for your help.
That´s a little complicate. Because Weka use a wrapper class for the LibSVM-library with JNI-binding.
The LibSVM has a protected field to store the svm_model. So you have to use reflection to access this model. According to the FAQ off LibSVM [Link 3] the support vectors are only available after the training.
On Gist [Link 1] you will find a working example using reflection. The source code of the svm_model-Class is available on GitHub [Link 2].
https://gist.github.com/DavidWiesner/2de8a6b2b89ffeaa6d0f
https://github.com/cjlin1/libsvm/blob/master/java/libsvm/svm_model.java
https://www.csie.ntu.edu.tw/~cjlin/libsvm/faq.html#f434
please refer the following link
https://www.csie.ntu.edu.tw/~cjlin/libsvm/
ijcsi.org/papers/IJCSI-10-3-1-317-325.pdf
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