Weka (Waikato Environment for Knowledge Analysis) is a popular suite of machine learning software written in Java, developed at the University of Waikato, New Zealand. Weka is free software available under the GNU General Public License. The Weka (pronounced Weh-Kuh) workbench contains a collection of visualization tools and algorithms for data analysis and predictive modeling, ....together with graphical user interfaces for easy access to this functionality.