There are two versions of Weka: Weka 3.8 is the latest stable version and Weka 3.9 is the development version. New releases of these two versions are normally made once or twice a year. For the bleeding edge, it is also possible to download nightly snapshots of these two versions.

The stable version receives only bug fixes and feature upgrades that do not break compatibility with its earlier releases, while the development version may receive new features that break compatibility with its earlier releases.

Weka 3.8 and 3.9 feature a package management system that makes it easy for the Weka community to add new functionality to Weka. The package management system requires an internet connection in order to download and install packages.

Snapshots

Every night, a snapshot of the Subversion repository with the Weka source code is taken, compiled, and put together in ZIP files. This happens for both the development branch of the software and the stable branch. Those who want the latest bug fixes before the next official release is made can download these snapshots.

Stable version

Weka 3.8 is the latest stable version of Weka. This branch of Weka only receives bug fixes and upgrades that do not break compatibility with earlier 3.8 releases, although major new features may become available in packages. There are different options for downloading and installing it on your system:

Windows

  • Click here to download a self-extracting executable for 64-bit Windows that includes Azul's 64-bit OpenJDK Java VM 11 (weka-3-8-4-azul-zulu-windows.exe; 118 MB)

This executable will install Weka in your Program Menu. Launching via the Program Menu or shortcuts will automatically use the included JVM to run Weka.

Mac OS

  • Click here to download a disk image for Mac OS that contains a Mac application including Azul's 64-bit OpenJDK Java VM 11 (weka-3-8-4-azul-zulu-osx.dmg; 144 MB)

Linux

  • Click here to download a zip archive for Linux that includes Azul's 64-bit OpenJDK Java VM 11 (weka-3-8-4-azul-zulu-linux.zip; 129 MB)

First unzip the the zip file. This will create a new directory called weka-3-8-4. To run Weka, change into that directory and type

./weka.sh

Other platforms

  • Click here to download a zip archive containing Weka (weka-3-8-4.zip; 53 MB)

First unzip the zip file. This will create a new directory called weka-3-8-4. To run Weka, change into that directory and type

java -jar weka.jar

Note that Java needs to be installed on your system for this to work. Also note that using -jar will override your current CLASSPATH variable and only use the weka.jar.

Developer version

This is the main development trunk of Weka and continues from the stable Weka 3.8 code line. It may receive new features that break backwards compatibility.

Windows

  • Click here to download a self-extracting executable for 64-bit Windows that includes Azul's 64-bit OpenJDK Java VM 11 (weka-3-9-4-azul-zulu-windows.exe; 117 MB)

This executable will install Weka in your Program Menu. Launching via the Program Menu or shortcuts will automatically use the included JVM to run Weka.

Mac OS

  • Click here to download a disk image for Mac OS that contains a Mac application including Azul's 64-bit OpenJDK Java VM 11 JVM (weka-3-9-4-azul-zulu-osx.dmg; 143 MB)

Linux

  • Click here to download a zip archive for Linux that includes Azul's 64-bit OpenJDK Java VM 11 (weka-3-9-4-azul-zulu-linux.zip; 128 MB)

First unzip the the zip file. This will create a new directory called weka-3-9-4. To run Weka, change into that directory and type

./weka.sh

Other platforms

  • Click here to download a zip archive containing Weka (weka-3-9-4.zip; 52 MB)

First unzip the zip file. This will create a new directory called weka-3-9-4. To run Weka, change into that directory and type

java -jar weka.jar

Note that Java needs to be installed on your system for this to work. Also note, that using -jar will override your current CLASSPATH variable and only use the weka.jar.

Old versions

All old versions of Weka are available from the Sourceforge website.

Upgrading from Weka 3.7

In case you are upgrading an existing Weka 3.7 installation, if the Weka 3.8 package manager does not start up, please delete the file installedPackageCache.ser in the packages folder that resides in the wekafiles folder in your user home. Also, serialized Weka models created in 3.7 are incompatible with 3.8. The model migrator tool can migrate some models to 3.8 (a known exception is RandomForest). Usage is as follows:

java -cp <path to modelMigrator.jar>:<path to weka.jar> weka.core.ModelMigrator -i <path to old serialized weka mode> -o <upgraded model file name>