
 Description:
The Weka workbench contains a collection of visualization tools and algorithms for data analysis and predictive modelling, together with graphical user interfaces for easy access to this functionality. The main strengths of Weka are that it is freely available under the GNU General Public License, very portable because it is fully implemented in the Java programming language and thus runs on almost any computing platform, contains a comprehensive collection of data preprocessing and modeling techniques, and is easy to use by a novice due to the graphical user interfaces it contains.
Weka supports several standard data mining tasks, more specifically, data preprocessing, clustering, classification, regression, visualization, and feature selection. All of Weka's techniques are predicated on the assumption that the data is available as a single flat file or relation, where each data point is described by a fixed number of attributes (normally, numeric or nominal attributes, but some other attribute types are also supported). Weka provides access to SQL databases using Java Database Connectivity and can process the result returned by a database query. It is not capable of multirelational data mining, but there is separate software for converting a collection of linked database tables into a single table that is suitable for processing using Weka. Another important area that is currently not covered by the algorithms included in the Weka distribution is sequence modeling.
Weka's main user interface is the Explorer, but essentially the same functionality can be accessed through the componentbased Knowledge Flow interface and from the command line. There is also the Experimenter, which allows the systematic comparison of the predictive performance of Weka's machine learning algorithms on a collection of datasets.
The Explorer interface has several panels that give access to the main components of the workbench. The Preprocess panel has facilities for importing data from a database, a CSV file, etc., and for preprocessing this data using a socalled filtering algorithm. These filters can be used to transform the data (e.g., turning numeric attributes into discrete ones) and make it possible to delete instances and attributes according to specific criteria. The Classify panel enables the user to apply classification and regression algorithms (indiscriminately called classifiers in Weka) to the resulting dataset, to estimate the accuracy of the resulting predictive model, and to visualize erroneous predictions, ROC curves, etc., or the model itself (if the model is amenable to visualization like, e.g., a decision tree). Weka contains many of the latest sophisticated methods, such as support vector machines, gaussian processes, random forests, but also classic methods like C4.5, ANNs, bagging, boosting, etc. The Associate panel provides access to association rule learners that attempt to identify all important interrelationships between attributes in the data. The Cluster panel gives access to the clustering techniques in Weka, e.g., the simple kmeans algorithm. There is also an implementation of the expectation maximization algorithm for learning a mixture of normal distributions. The next panel, Select attributes provides algorithms for identifying the most predictive attributes in a dataset. The last panel, Visualize, shows a scatter plot matrix, where individual scatter plots can be selected and enlarged, and analyzed further using various selection operators.
What's new since version 3.6.0?
 Package management system
 Support for importing PMML support vector machines
 Denormalize filter for flattening transactional data
 SGD stochastic gradient descent for learning binary SVMs, logistic regression and linear regression (can be trained incrementally)
 scatterPlot3D  a new package that adds a 3D scatter plot visualization to the Explorer
 associationRulesVisualizer  a new package that adds a 3D visualization of association rules to Associations panel of the Explorer
 massiveOnlineAnalysis  a new connector package for the MOA data stream learning tool
 Tabu search method for feature selection
 EMbased imputation of missing values
 Speed improvements for random trees, which in turn lead faster random forests (up to an order of magnitude faster)
 Support for importing PMML decision trees
 Apriori can make use of sparse instances for market basket type data
 Support for using environment variables in the Knowledge Flow
 Support for Groovy scripting
 Improvements to the loading of CSV files
 Enhanced plugin support in the Explorer's Classify panel
 Filter for sorting the labels of nominal attributes
 Information on instance weights displayed in the Preprocess panel of the Explorer
 Wrapper feature selection now supports mae, fmeasure, auc, rmse (probabilities), mae (probabilities) as well as the original error rate and rmse
 Converters to read and write Matlab's ASCII file format
 FPGrowth association rule learner
 SPegasos algorithm for learning linear support vector machines via stochastic gradient descent
 PMML decision trees and rule set models
 Cost/benefit analysis component
 Support for parallel processing in some meta learners
 FURIA rule learner
 Friedman's RealAdaBoost algorithm
 HierarchicalClusterer, implementing a number of hierarchical clustering techniques
 Improved and faster version of Gaussian process regression
 Evaluation routines for conditional density estimates and interval estimators
 OneClassClassifier
 Architectural changes: Classifier and Instance are now interfaces; core does not depend on FastVector any more
 SGDText  stochastic gradient descent for learning linear SVMs and logistic regression for text problems. Operates incrementally and directly on string attributes.
 MITI multiinstance tree learner and MIRI rule learner variant.
 sasLoader  SAS sas7bdat file reader.
 wekaServer  A simple servletbased server for executing data mining tasks.
 Incremental version of the multiclass meta classifier.
 NaiveBayesMultinomialText  version of multinomial NB that operates directly on string attributes.
 Integration with the R statistical environment
 Local Outlier Factor (LOF) anomaly detection filter
 Isolation Forests outlier detection
 Multilayer perceptrons package
 HoeffdingTree. Ported from the MOA implementation to a Weka classifier
 MergeInfrequentNominalValues filter
 MergeNominalValuesFilter. Uses an CHAIDstyle merging routine
 Zoom facility in the Knowledge Flow
 Epsiloninsensitive and Huber loss functions in SGD
 More CSVLoader improvements
 Class specific IR metric based evaluation in WrapperSubsetEval
 GainRatioAttributeEval now supports instance weights
 New command line option to force batch training mode when the classifier is an incremental one
 LinearRegression is now faster and more memory efficient thanks to a contribution from Sean Daugherty
 CfsSubsetEval can now use multiple CPUs/cores to precompute the correlation matrix (speeds up backward searches)
 GreedyStepwise can now evaluate mutliple subsets in parallel
 New kernelLogisticRegression package
 New supervisedAttributeScaling package
 New clojureClassifier package
 localOutlierFactor now includes a wrapper classifier that uses the LOF filter
 scatterPlot3D now includes new Java3D libraries for all major platforms
 New IWSS (Incremental Wrapper Subset Selection) package contributed by Pablo Bermejo
 New MODLEM package (rough set theory based rule induction) contributed by Szymon Wojciechowski
[1] Ian H. Witten; Eibe Frank (2005). Data Mining: Practical machine learning tools and techniques, 2nd Edition. Morgan Kaufmann, San Francisco.
[2] G. Holmes; A. Donkin and I.H. Witten (1994). Weka: A machine learning workbench. Proc Second Australia and New Zealand Conference on Intelligent Information Systems, Brisbane, Australia.
[3] S.R. Garner; S.J. Cunningham, G. Holmes, C.G. NevillManning, and I.H. Witten (1995). Applying a machine learning workbench: Experience with agricultural databases. Proc Machine Learning in Practice Workshop, Machine Learning Conference, Tahoe City, CA, USA 1421.
[4] P. Reutemann; B. Pfahringer and E. Frank (2004). Proper: A Toolbox for Learning from Relational Data with Propositional and MultiInstance Learners. 17th Australian Joint Conference on Artificial Intelligence (AI2004). SpringerVerlag.
[5] Ian H. Witten; Eibe Frank, Len Trigg, Mark Hall, Geoffrey Holmes, and Sally Jo Cunningham (1999). Weka: Practical Machine Learning Tools and Techniques with Java Implementations. Proceedings of the ICONIP/ANZIIS/ANNES'99 Workshop on Emerging Knowledge Engineering and ConnectionistBased Information Systems 192196.
[6] Gregory PiatetskyShapiro (20050628). KDnuggets news on SIGKDD Service Award 2005.
 Changes to previous version:
In core weka:
 JAMAbased linear algebra routines replaced with MTJ. Faster operation with the option to use native libraries for even more speed
 General efficiency improvements in core, filters and some classifiers
 GaussianProcesses now handles instance weights
 New Knowledge Flow implementation. Engine completely rewritten from scratch with a simplified API
 New Workbench GUI
 GUI package manager now has a search facility
 FixedDictionaryStringToWordVector filter allows the use of an external dictionary for vectorization. DictionarySaver converter can be used to create a dictionary file
In packages:
 Packages that were using JAMA are now using MTJ
 New netlibNativeOSX, netlibNativeWindows and netlibNativeLinux packages providing native reference implementations (and systemoptimized implementation in the case of OSX) of BLAS, LAPACK and ARPACK linear algebra
 New elasticNet package, courtesy of Nikhil Kinshore
 New niftiLoader package for loading a directory with MIR data in NIfTI format into Weka
 New percentageErrorMetrics package  provides plugin evaluation metrics for root mean square percentage error and mean absolute percentage error
 New iterativeAbsoluteErrorRegression package  provides a meta learner that fits a regression model to minimize absolute error
 New largeScaleKernelLearning package  contains filters for largescale kernelbased learning
 discriminantAnalysis package now contains an implementation for LDA and QDA
 New Knowledge Flow component implementations in various packages
 newKnowledgeFlowStepExamples package  contains code examples for new Knowledge Flow API discussion in the Weka Manual
 RPlugin updated to latest version of MLR
 scatterPlot3D and associationRulesVisualizer packages updated with latest Java 3D libraries
 Support for pluggable activation functions in the multiLayerPerceptrons package
 BibTeX Entry: Download
 Corresponding Paper BibTeX Entry: Download
 URL: Project Homepage
 Supported Operating Systems: Cygwin, Linux, Macosx, Windows
 Data Formats: None
 Tags: Association Rules, Attribute Selection, Classification, Clustering, Preprocessing, Regression
 Archive: download here
Other available revisons

Version Changelog Date 3.9.1 In core weka:
 JAMAbased linear algebra routines replaced with MTJ. Faster operation with the option to use native libraries for even more speed
 General efficiency improvements in core, filters and some classifiers
 GaussianProcesses now handles instance weights
 New Knowledge Flow implementation. Engine completely rewritten from scratch with a simplified API
 New Workbench GUI
 GUI package manager now has a search facility
 FixedDictionaryStringToWordVector filter allows the use of an external dictionary for vectorization. DictionarySaver converter can be used to create a dictionary file
In packages:
 Packages that were using JAMA are now using MTJ
 New netlibNativeOSX, netlibNativeWindows and netlibNativeLinux packages providing native reference implementations (and systemoptimized implementation in the case of OSX) of BLAS, LAPACK and ARPACK linear algebra
 New elasticNet package, courtesy of Nikhil Kinshore
 New niftiLoader package for loading a directory with MIR data in NIfTI format into Weka
 New percentageErrorMetrics package  provides plugin evaluation metrics for root mean square percentage error and mean absolute percentage error
 New iterativeAbsoluteErrorRegression package  provides a meta learner that fits a regression model to minimize absolute error
 New largeScaleKernelLearning package  contains filters for largescale kernelbased learning
 discriminantAnalysis package now contains an implementation for LDA and QDA
 New Knowledge Flow component implementations in various packages
 newKnowledgeFlowStepExamples package  contains code examples for new Knowledge Flow API discussion in the Weka Manual
 RPlugin updated to latest version of MLR
 scatterPlot3D and associationRulesVisualizer packages updated with latest Java 3D libraries
 Support for pluggable activation functions in the multiLayerPerceptrons package
December 19, 2016, 04:44:20 3.9.0 In core weka:
 JAMAbased linear algebra routines replaced with MTJ. Faster operation with the option to use native libraries for even more speed
 General efficiency improvements in core, filters and some classifiers
 GaussianProcesses now handles instance weights
 New Knowledge Flow implementation. Engine completely rewritten from scratch with a simplified API
 New Workbench GUI
 GUI package manager now has a search facility
 FixedDictionaryStringToWordVector filter allows the use of an external dictionary for vectorization. DictionarySaver converter can be used to create a dictionary file
In packages:
 Packages that were using JAMA are now using MTJ
 New netlibNativeOSX, netlibNativeWindows and netlibNativeLinux packages providing native reference implementations (and systemoptimized implementation in the case of OSX) of BLAS, LAPACK and ARPACK linear algebra
 New elasticNet package, courtesy of Nikhil Kinshore
 New niftiLoader package for loading a directory with MIR data in NIfTI format into Weka
 New percentageErrorMetrics package  provides plugin evaluation metrics for root mean square percentage error and mean absolute percentage error
 New iterativeAbsoluteErrorRegression package  provides a meta learner that fits a regression model to minimize absolute error
 New largeScaleKernelLearning package  contains filters for largescale kernelbased learning
 discriminantAnalysis package now contains an implementation for LDA and QDA
 New Knowledge Flow component implementations in various packages
 newKnowledgeFlowStepExamples package  contains code examples for new Knowledge Flow API discussion in the Weka Manual
 RPlugin updated to latest version of MLR
 scatterPlot3D and associationRulesVisualizer packages updated with latest Java 3D libraries
 Support for pluggable activation functions in the multiLayerPerceptrons package
April 15, 2016, 06:35:30 3.7.13 In core weka:
 Numerically stable implementation of variance calculation in core Weka classes  thanks to Benjamin Weber
 Unified expression parsing framework (with compiled expressions) is now employed by filters and tools that use mathematical/logical expressions  thanks to Benjamin Weber
 Developers can now specify GUI and commandline options for their Weka schemes via a new unified annotationbased mechanism
 ClassConditionalProbabilities filter  replaces the value of a nominal attribute in a given instance with its probability given each of the possible class values
 GUI package manager's available list now shows both packages that are not currently installed, and those installed packages for which there is a more recent version available that is compatible with the base version of Weka being used
 ReplaceWithMissingValue filter  allows values to be randomly (with a userspecified probability) replaced with missing values. Useful for experimenting with methods for imputing missing values
 WrapperSubsetEval can now use plugin evaluation metrics
In packages:
 alternatingModelTrees package  alternating trees for regression
 timeSeriesFilters package, contributed by Benjamin Weber
 distributedWekaSpark package  wrapper for distributed Weka on Spark
 wekaPython package  execution of CPython scripts and wrapper classifier/clusterer for Scikit Learn schemes
 MLRClassifier in RPlugin now provides access to almost all classification and regression learners in MLR 2.4
September 11, 2015, 04:55:02 3.7.12 In core weka:
 GUIChooser now has a plugin exension point that allows implementations of GUIChooser.GUIChooserMenuPlugin to appear as entries in either the Tools or Visualization menus
 SubsetByExpression filter now has support for regexp matching
 weka.classifiers.IterativeClassifierOptimizer  a classifier that can efficiently optimize the number of iterations for a base classifier that implements IterativeClassifier
 Speedup for LogitBoost in the two class case
 weka.filters.supervised.instance.ClassBalancer  a simple filter to balance the weight of classes
 New class hierarchy for stopwords algorithms. Includes new methods to read custom stopwords from a file and apply multiple stopwords algorithms
 Ability to turn off capabilities checking in Weka algorithms. Improves runtime for ensemble methods that create a lot of simple base classifiers
 Memory savings in weka.core.Attribute
 Improvements in runtime for SimpleKMeans and EM
 weka.estimators.UnivariateMixtureEstimator  new mixture estimator
In packages:
 New discriminantAnalysis package. Provides an implementation of Fisher's linear discriminant analysis
 Quartile estimators, correlation matrix heat map and kmeans++ clustering in distributed Weka
 Support for default settings for GridSearch via a properties file
 Improvements in scripting with addition of the offical Groovy console (kfGroovy package) from the Groovy project and TigerJython (new tigerjython package) as the Jython console via the GUIChooser
 Support for the latest version of MLR in the RPlugin package
 EAR4 package contributed by Vahid Jalali
 StudentFilters package contributed by Chris Gearhart
 graphgram package contributed by Johannes Schneider
December 17, 2014, 03:04:17 3.7.11 In core weka:
 Bagging and RandomForest are now faster if the base learner is a WeightedInstancesHandler
 Speedups for REPTree and other classes that use entropy calculations
 Many other code improvements and speedups
 Additional statistics available in the output of LinearRegression and SimpleLinearRegression. Contributed by Chris Meyer
 Reduced memory consumption in BayesNet
 Improvements to the package manager: load status of individual packages can now be toggled to prevent a package from loading; "Available" button now displays the latest version of all available packages that are compatible with the base version of Weka
 RandomizableFilteredClassifier
 Canopy clusterer
 ImageViewer KnowledgeFlow component
 PMML export support for Logistic. Infrastructure and changes contributed by David Person
 Extensive tooltips now displayed in the Explorer's scheme selector tree lists
 Join KnowledgeFlow component for performing an inner join on two incoming streams/data sets
In packages:
 IWSSembeded package, contributed by Pablo Bermejo
 CVAttributeEval package, contributed by Justin Liang
 distributedWeka package for Hadoop
 Improvements to multiLayerPerceptrons and addtion of MLPAutoencoder
 Code cleanup in many packages
April 24, 2014, 10:13:12 3.7.10 http://sourceforge.net/projects/weka/files/weka37/3.7.10/README3710.txt/view
July 31, 2013, 05:27:43 3.7.9 http://sourceforge.net/projects/weka/files/weka37/3.7.9/README379.txt/view
February 24, 2013, 09:13:22 3.7.8 http://sourceforge.net/projects/weka/files/weka37/3.7.8/README378.txt/view
January 25, 2013, 01:37:56 3.7.7 http://sourceforge.net/projects/weka/files/weka37/3.7.7/README377.txt/view
August 17, 2012, 02:23:06 3.7.6 http://sourceforge.net/projects/weka/files/weka37/3.7.6/README376.txt/view
May 11, 2012, 03:59:26 3.7.5 http://sourceforge.net/projects/weka/files/weka37/3.7.5/README375.txt/view
October 31, 2011, 09:09:36 3.7.4 http://sourceforge.net/projects/weka/files/weka37/3.7.4/README374.txt/view
June 30, 2011, 11:04:14 3.7.3 Initial Announcement on mloss.org.
December 10, 2010, 00:10:01 3.7.2 Initial Announcement on mloss.org.
August 2, 2010, 11:17:22 3.7.1 Initial Announcement on mloss.org.
January 12, 2010, 21:50:10 3.7.0 Initial Announcement on mloss.org.
June 5, 2009, 05:38:28 3.6.0 Initial Announcement on mloss.org.
November 11, 2007, 22:24:02
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