kensuke-mitsuzawa/liblinear_tool

tools for liblinear

Liblinear tools

What's this ??

Tools for liblinear. For libsvm, there are useful tools. However, they does not fit to liblinear. We need to rewrite them for liblinear. That's very inconvenient. Thus, I opened tools for liblinear.

Tools in this repo.

• scaling feature value
• grid searching of hyperparameter C and xi
• feature selection tuning on F-value

Files You need

• liblinear: I confirmed at version 1.94
• svm-scale: svm-scale exists in libsvm package. svm-scale is need to scale feature values

Usage

scaling feature value and grid searching

use ./tools/liblin_easy.py

1: you have to rewrite header to change path for your environment

#you can re-write for your environment 
svmscale_exe='../svm-scale';
liblinear_exe='../liblinear-1.94/train';
grid_py='/home/kensuke-mi/opt/libsvm-3.17/tools/grid.py';
import re, subprocess, os, sys;
#you can re-write for your environment 
sys.path.append('../liblinear-1.94/python/');
import liblinear, liblinearutil;

2: specify path to training file and test file

train_pathname='../heart_scale'
test_pathname='../heart_scale'

3: initialize instance

test01=Liblin_easy(train_pathname,test_pathname)

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To scale feature values

test01.scalling_value()

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To parameter tuning with grid search. You can tune parameters for other files, if you rewrite argument of this method.

test01.grid_search(train_pathname)

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If you use easy_tuning(), it automatically do scaling and grid search on training file

test01.easy_tuning()

Acknowledgement

I really thank to team member of liblinear and libsvm