RapidMiner (formerly YALE) is a flexible Java environment for knowledge discovery in databases, machine learning, and data mining. Many nestable learning and preprocessing operators (including Weka) are provided. It features an XML-based graphical user interface, a plugin mechanism, and high-dimensional plotting, and provides an easy-to-use extension mechanism that makes it possible to integrate new operators and adapt the system to your personal requirements. A command line version is also included. License: Affero General Public License Changes: This is a major bugfix and feature release. The new features include a 64-bit version for Windows x64 systems, an improved and more comprehensive documentation of all operators inside the program, two different icon sets and look and feels, and a new and improved plotting facility including different shapes for plotter points. The most important preprocessing operators can now produce both views and materialized data changes, and several new preprocessing models were added. New wizards for parameter optimization were added. About 80 bugs were fixed.

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