Virtual environment manager for Weka, inspired by the extremely useful virtual environments that Python supports.

weka-virtualenv can be used for launching the GUI or arbitrary Weka classes.

Since weka-virtualenv uses options starting with double-dashes (--), clashes with Weka options are avoided. Any option that wasn't consumed by weka-virtualenv will get further processed by the command. E.g., when launching the Explorer using the explorer command, a dataset can be supplied to load immediately, or, when executing a classifier using the run command, any additional option will get passed to the Weka class.

You can use the tool either through the command-line or through its user interface. Some basic scripting support is available through the script command-line command (see Scripting section).

How it works

The tool simply uses existing Weka functionality, namely the WEKA_HOME environment variable, for separating the various environments. When launching a class or GUI tool, it launches a new Java process with the WEKA_HOME environment variable pointing to the current environment's wekafiles directory.

If an environment has no Java or heap size configure (<default>), then it just uses the system's default settings for launching the new process.

User interface

You can start the GUI with the following script from the bin directory:

  • Linux/Mac:
  • Windows: wenvgui.bat


Arff Command Selector

This little tool lets you choose environment and application (Explorer or Arff Viewer) to launch, using the provided dataset filenames (e.g., Open with from the right-click mouse context menu):

  • Linux/Mac:
  • Windows: wenvarff.bat



You can find videos for the tool in the following YouTube playlist:

weka-virtualenv playlist

Windows users just have to substitute the and scripts with wenv.bat and wenvgui.bat. For adding the tool's bin directory to your PATH environment variable (to make it available from the command prompt), follow these instructions.