I try to understand and learn to use libsvm to training, classify and recognize thing but first time, it’s hard to understand it without reading well about SVM.
Then I face again the issue understanding the libsvm that I’m going to use, here the way I go:
I choose Java to use with libsvm so here one of my practice on libsvm
I download version 3.17 (tar.gz) from following site:
You can compile all java files at:
But my case, I used pre-compile libsvm: libsvm.jar from the package
Learn with example svmguide1
libsvm comes with following methods:
Read at Installation and data format to understand these functions.
Example with svmguide1
- Download the training and testing data at libsvm dataset
- I place the files in folder: guide1, here is my folder structures
.java │ batch-svm-predict.bat (to create) │ batch-svm-train.bat (to create) │ libsvm.jar │ Makefile │ svm_predict.java │ svm_scale.java │ svm_toy.java │ svm_train.java │ test_applet.html │ ├───guide1 (I created) │ svmguide1 │ svmguide1.model │ svmguide1.predict │ svmguide1.t │ ├───libsvm │ svm.java │ svm.m4 │ svm_model.java │ svm_node.java │ svm_parameter.java │ svm_print_interface.java │ svm_problem.java
- I write a batch script to run: svm-training: batch-svm-train.bat
@echo off setlocal title Batch SVM Training with libsvm java -classpath libsvm.jar svm_train guide1/svmguide1 guide1/svmguide1.model Pause endlocal
- Run svm-training on the svmguid1 file:
D:\libsvm-3.17\java>batch-svm-train.bat .....* optimization finished, #iter = 5371 nu = 0.6061503521187195 obj = -1061.528918183956, rho = -0.49526608854956916 nSV = 3053, nBSV = 722 Total nSV = 3053 Press any key to continue . . .
- Write batch file for svm-predict for testing file: batch-svm-predict.bat
@echo off setlocal title Batch SVM Predict with libsvm java -classpath libsvm.jar svm_predict guide1/svmguide1.t guide1/svmguide1.model guide1/svmguide1.predict Pause endlocal
- Run svm-predict on testing file: svmguide1.t with recent generated model
D:\libsvm-3.17\java>batch-svm-predict.bat Accuracy = 66.925% (2677/4000) (classification)
So here, I got result of accuracy = 66.925%
That’s a beginner guide to get into libsvm with Java that’s you might need it as me at the first time.
Next… I need to understand how a training/testing data generated.
- Sample Testing Package in GitHub