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LibSVM on Mac OSX

Here are the basic steps to install libSVM on Mac OSX.

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brew install gnuplot
brew install qt4
brew install libsvm

Installing libsvm itself in system path is easy, however hombrew does not include demo-data, python/java integration, or other goodies. The finally installation in homebrew only consists these files:

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libsvm
libsvm/3.17
libsvm/3.17/bin
libsvm/3.17/bin/svm-predict
libsvm/3.17/bin/svm-scale
libsvm/3.17/bin/svm-train
libsvm/3.17/COPYRIGHT
libsvm/3.17/include
libsvm/3.17/include/svm.h
libsvm/3.17/INSTALL_RECEIPT.json
libsvm/3.17/lib
libsvm/3.17/lib/libsvm.2.dylib
libsvm/3.17/lib/libsvm.dylib
libsvm/3.17/README

In this post, I’ll show you how to modify some Makefiles and create mac specific binaries.

Python, java, or GUI applications (Qt)

First, fetch the source code of libsvm, and compile it.

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curl -LO http://www.csie.ntu.edu.tw/~cjlin/cgi-bin/libsvm.cgi?+http://www.csie.ntu.edu.tw/~cjlin/libsvm+tar.gz
tar xzvpf libsvm+tar.gz
cd libsvm-3.17
make

SVM-Toy (GUI)

Now, goto svm-toy/qt directory. Change the CFLAGS and MOC variable in the Makefile.

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CXX? = g++

CFLAGS = -Wall -O3 -I$(INCLUDE) -I$(INCLUDE)/QtGui -framework QtCore -framework QtGui -F/usr/local/Cellar/qt/4.8.4/lib/
INCLUDE = /usr/local/Cellar/qt/4.8.4/include/
MOC = moc

svm-toy: svm-toy.cpp svm-toy.moc ../../svm.o
	$(CXX) $(CFLAGS) svm-toy.cpp ../../svm.o -o svm-toy

svm-toy.moc: svm-toy.cpp
	$(MOC) svm-toy.cpp -o svm-toy.moc

../../svm.o: ../../svm.cpp ../../svm.h
	make -C ../.. svm.o

clean:
	rm -f *~ svm-toy svm-toy.moc ../../svm.o

Then make. The compile step should run successfully. Try the program ./svm-toy, press load button and select a demo svm-file (heart_scale for example), then press run, you should see the result!

Select heart_scale svm toy

Python interface

To use the python interface, just export the PYTHONPATH variable to where python utility fuction located at.

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cd libsvm-3.17/python
echo "export PYTHONPATH=\$PYTHONPATH:$(pwd)" >> ~/.bash_profile
source ~/.bash_profile

Then read the README file in the same directory, and try out the example usage of python interface.

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