There are two versions of Weka: Weka 3.8 is the latest stable versionand Weka 3.9 is the development version. New releases of these two versionsare normally made once or twice a year. For the bleeding edge, it isalso possible to download nightly snapshots of these two versions.
The stable version receives only bug fixes and feature upgrades thatdo not break compatibility with its earlier releases, while thedevelopment version may receive new features that break compatibilitywith its earlier releases.
Weka 3.8 and 3.9 feature a package management system that makes iteasy for the Weka community to add new functionality to Weka. Thepackage management system requires an internet connection in order todownload and install packages.
Every night, a snapshot of the Subversion repository with the Wekasource code is taken, compiled, and put together in ZIP files. Thishappens for both the development branch of the software and the stablebranch. Those who want the latest bug fixes before the next officialrelease is made can download thesesnapshots.
Weka 3.8 is the latest stable version of Weka. This branch of Wekaonly receives bug fixes and upgrades that do not break compatibilitywith earlier 3.8 releases, although major new features may becomeavailable in packages. There are different options for downloadingand installing it on your system:
Windows
- Clickhereto download a self-extracting executable for 64-bit Windows thatincludes Azul's 64-bit OpenJDK Java VM 11 (weka-3-8-5-azul-zulu-windows.exe; 124.6 MB)
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This executable will install Weka in your Program Menu. Launching via the ProgramMenu or shortcuts will automatically use the included JVM to run Weka.
Mac OS
- Clickhereto download a disk image for Mac OS that contains aMac application including Azul's 64-bit OpenJDK Java VM 11(weka-3-8-5-azul-zulu-osx.dmg; 151.8 MB)
Linux
- Clickhereto download a zip archive for Linux that includes Azul's 64-bit OpenJDK Java VM 11(weka-3-8-5-azul-zulu-linux.zip; 137.4 MB)
First unzip the the zip file. This will create a new directory calledweka-3-8-5. To run Weka, change into that directory and type
Other platforms
- Click here to download a zip archive containing Weka (weka-3-8-5.zip; 55.4 MB)
First unzip the zip file. This will create a new directory calledweka-3-8-5. To run Weka, change into that directory and type
Weka 3
Note that Java needs to be installed on your system for this towork. Also note that using -jar will override your currentCLASSPATH variable and only use the weka.jar.
This is the main development trunk of Weka and continues from the stable Weka 3.8 code line. Itmay receive new features that break backwards compatibility.
Windows
- Clickhereto download a self-extracting executable for 64-bit Windows thatincludes Azul's 64-bit OpenJDK Java VM 11 (weka-3-9-5-azul-zulu-windows.exe; 124.4 MB)
This executable will install Weka in your Program Menu. Launching via the ProgramMenu or shortcuts will automatically use the included JVM to run Weka.
Mac OS
- Clickhereto download a disk image for Mac OS that contains aMac application including Azul's 64-bit OpenJDK Java VM 11JVM (weka-3-9-5-azul-zulu-osx.dmg; 151.6 MB)
Linux
- Clickhereto download a zip archive for Linux that includes Azul's 64-bit OpenJDK Java VM 11(weka-3-9-5-azul-zulu-linux.zip; 137.2 MB)
First unzip the the zip file. This will create a new directory calledweka-3-9-5. To run Weka, change into that directory and type
Other platforms
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- Click here to download a zip archive containing Weka (weka-3-9-5.zip; 55.2 MB)
First unzip the zip file. This will create a new directory calledweka-3-9-5. To run Weka, change into that directory and type
Note that Java needs to be installed on your system for this towork. Also note, that using -jar will override your currentCLASSPATH variable and only use the weka.jar.
All old versions of Weka are available from the Sourceforgewebsite.
Upgrading from Weka 3.7
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In case you are upgrading an existing Weka 3.7 installation, if theWeka 3.8 package manager does not start up, please delete the fileinstalledPackageCache.ser in the packages folder that resides inthe wekafiles folder in your user home. Also, serialized Weka modelscreated in 3.7 are incompatible with 3.8. The modelmigratortool can migrate some models to 3.8 (a knownexception is RandomForest). Usage is as follows: