Use Weka in Python

Question

I have been trying unssuccessfully so far to install the package for Weka (Weka 0.1.3)found here on my Windows computer. My problem is that each time I try to run the setup or use the command:

pip install -U https://github.com/chrisspen/weka/tarball/master

I get an assertion error saying that

"Weka JAR file /usr/share/java/weka.jar not found. Ensure the file is installed or update your environment's WEKA_JAR_PATH to only include valid locations."

Indeed I do not have this file, but how should I get it? I am not sure if I missed anything regarding the installation, at least I did what's specified on the official webpage.

Any suggestions? Many thanks!

Steve Barnes · Accepted Answer · 2014-01-12 11:17:43Z

1

Since this is a wrapper package you need to install Weka, (presumably for windows), as well - it is here you may also have to upgrade or install java.

answered Jan 12, 2014 at 11:17

Steve Barnes

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2 Comments

Crista23 Over a year ago

Thanks for the answer! I also did that, so I have installed Weka 3.6.10, but it's a desktop application. Thought I can use it directly from Python somehow..

Steve Barnes Over a year ago

Try downloading and unzipping the zip format - then set WEKA_JAR_PATH to point to where you unzipped it.

hkn · Accepted Answer · 2014-02-20 13:28:52Z

1

To run in Windows:

Add weka.jar, libsvm.jar, wlsvm.jar to C:\usr\share\java directory (libsvm.jar and wlsvm.jar can be found at http://www.cs.iastate.edu/~yasser/wlsvm/)
run pip install -U https://github.com/chrisspen/weka/tarball/master
When you try to run classifiers you will get a classpath error. To solve this error edit installed file <Python install dir>\Lib\site-packages\weka\classifiers.py
Line 33: Change for _cp in CP.split(':'): to for _cp in CP.split(os.pathsep):
Line 286: Change close_fds=True to close_fds=sys.platform != "win32"

answered Feb 20, 2014 at 13:28

hkn

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