Downloading and installing Weka
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.
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.
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 17 (weka-3-8-6-azul-zulu-windows.exe; 133.2 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 - Intel processors#
- Click here to download a disk image for Mac OS that contains a Mac application including Azul's 64-bit OpenJDK Java VM 17 for Intel Macs. (weka-3-8-6-azul-zulu-osx.dmg; 180.2 MB)
Mac OS - ARM processors#
- Click here to download a disk image for Mac OS that contains a Mac application including Azul's 64-bit OpenJDK Java VM 17 for ARM Macs. (weka-3-8-6-azul-zulu-arm-osx.dmg; 166.3 MB)
Linux#
- Click here to download a zip archive for Linux that includes Azul's 64-bit OpenJDK Java VM 17 (weka-3-8-6-azul-zulu-linux.zip; 146.9 MB)
First unzip the zip file. This will create a new directory called weka-3-8-5. To run Weka, change into that directory and type
Other platforms#
- Click here to download a zip archive containing Weka (weka-3-8-6.zip; 59.6 MB)
First unzip the zip file. This will create a new directory called weka-3-8-6. To run Weka, change into that directory and type
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 17 (weka-3-9-6-azul-zulu-windows.exe; 133.0 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 - Intel processors#
- Click here to download a disk image for Mac OS that contains a Mac application including Azul's 64-bit OpenJDK Java VM 17 for Intel Macs. (weka-3-9-6-azul-zulu-osx.dmg; 180.0 MB)
Mac OS - ARM processors#
- Click here to download a disk image for Mac OS that contains a Mac application including Azul's 64-bit OpenJDK Java VM 17 for ARM Macs. (weka-3-9-6-azul-zulu-arm-osx.dmg; 166.3 MB)
Linux#
- Click here to download a zip archive for Linux that includes Azul's 64-bit OpenJDK Java VM 17 (weka-3-9-6-azul-zulu-linux.zip; 146.7 MB)
First unzip the zip file. This will create a new directory called weka-3-9-6. To run Weka, change into that directory and type
Other platforms#
- Click here to download a zip archive containing Weka (weka-3-9-6.zip; 59.4 MB)
First unzip the zip file. This will create a new directory called weka-3-9-6. To run Weka, change into that directory and type
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: