Convert csv to libsvm format

Hi,

How can I convert csv format into sparse compatible for libsvm format?

[Salaheddin Hosseinzadeh]

Hi Nourhan,

What's libsvm format?!

tnx

Answer 1

[gaurang solanki]

Q: How to convert other data formats to LIBSVM format?

It depends on your data format. A simple way is to use libsvmwrite in the libsvm matlab/octave interface. Take a CSV (comma-separated values) file in UCI machine learning repository as an example. We download SPECTF.train. Labels are in the first column. The following steps produce a file in the libsvm format.

matlab> SPECTF = csvread('SPECTF.train'); % read a csv file

matlab> labels = SPECTF(:, 1); % labels from the 1st column

matlab> features = SPECTF(:, 2:end);

matlab> features_sparse = sparse(features); % features must be in a sparse matrix

matlab> libsvmwrite('SPECTFlibsvm.train', labels, features_sparse);

The tranformed data are stored in SPECTFlibsvm.train.

Alternatively, you can use convert.c to convert CSV format to libsvm format.

LINK :--- https://www.csie.ntu.edu.tw/~cjlin/libsvm/faq.html