practice the guide.pdf saved in C:\Temp\learn_libsvm\test1_research_the_GUIDE cd /media/sf_Temp/learn_libsvm/test3_test_libsvm/libsvm-3.23 && make =========================================================================== this test is for demo purpose(use easy.py in one step): use the data of project Astroparticle under https://www.csie.ntu.edu.tw/~cjlin/papers/guide/data/ , it has training dat as train.1 and test dat as test.1 : save train.1 into svmguide1 save test.1 into svmguide1.t //feature|attr value range [-1, 1], ./svm-scale -l -1 -u 1 -s range1 svmguide1 > svmguide1.scale /* 1 1:2.617300e+01 2:5.886700e+01 3:-1.894697e-01 4:1.251225e+02 ... into 1 1:-0.823781 2:-0.783405 3:-0.233795 4:0.361305 ... 0 1:-0.885045 2:-0.949015 3:0.182549 4:-0.519316 has 2 classes, class label Infected or Clean */ ./svm-scale -r range1 svmguide1.t > svmguide1.t.scale ./svm-train svmguide1.scale /* * optimization finished, #iter = 496 nu = 0.202599 obj = -507.307046, rho = 2.627039 nSV = 630, nBSV = 621 Total nSV = 630 */ ./svm-predict svmguide1.t.scale svmguide1.scale.model svmguide1.t.predict Accuracy = 96.15% (3846/4000) (classification) +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ to achieve better Accuracy, ./svm-train requires cross-validation and specify following args: -c -g the RBF kernel function argument C and galma //the grid tools is a time consumer ./tools/grid.py svmguide1.scale 2.0 2.0 96.9893 ./svm-train -c 2 -g 2 svmguide1.scale Accuracy = 96.875% =========================================================================== use easy.py in one step: apt-get install -y gnuplot cd tools/ && ./easy.py ../svmguide1 ../svmguide1.t Scaling training data... Cross validation... Best c=2.0, g=2.0 CV rate=96.9893 Training... Output model: svmguide1.model Scaling testing data... Testing... Accuracy = 96.875% (3875/4000) (classification) +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Tuesday, March 5, 2019
practice libsvm
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