Project details for WEKA

Screenshot WEKA 3.7.0

by mhall - June 5, 2009, 05:38:28 CET [ Project Homepage BibTeX BibTeX for corresponding Paper Download ]

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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 multi-relational 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 component-based 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 so-called 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 k-means 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?

  • Tabu search method for feature selection
  • EM-based 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, f-measure, auc, rmse (probabilities), mae (probabilities) as well as the original error rate and rmse
  • Converters to read and write Matlab's ASCII file format

[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. Nevill-Manning, 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 14-21.

[4] P. Reutemann; B. Pfahringer and E. Frank (2004). Proper: A Toolbox for Learning from Relational Data with Propositional and Multi-Instance Learners. 17th Australian Joint Conference on Artificial Intelligence (AI2004). Springer-Verlag.

[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 Connectionist-Based Information Systems 192-196.

[6] Gregory Piatetsky-Shapiro (2005-06-28). KDnuggets news on SIGKDD Service Award 2005.

Changes to previous version:

Initial Announcement on mloss.org.

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
3.7.11

In core weka:

  • Bagging and RandomForest are now faster if the base learner is a WeightedInstancesHandler
  • Speed-ups for REPTree and other classes that use entropy calculations
  • Many other code improvements and speed-ups
  • 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 tool-tips 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 clean-up in many packages
April 24, 2014, 10:13:12
3.7.10

http://sourceforge.net/projects/weka/files/weka-3-7/3.7.10/README-3-7-10.txt/view

July 31, 2013, 05:27:43
3.7.9

http://sourceforge.net/projects/weka/files/weka-3-7/3.7.9/README-3-7-9.txt/view

February 24, 2013, 09:13:22
3.7.8

http://sourceforge.net/projects/weka/files/weka-3-7/3.7.8/README-3-7-8.txt/view

January 25, 2013, 01:37:56
3.7.7

http://sourceforge.net/projects/weka/files/weka-3-7/3.7.7/README-3-7-7.txt/view

August 17, 2012, 02:23:06
3.7.6

http://sourceforge.net/projects/weka/files/weka-3-7/3.7.6/README-3-7-6.txt/view

May 11, 2012, 03:59:26
3.7.5

http://sourceforge.net/projects/weka/files/weka-3-7/3.7.5/README-3-7-5.txt/view

October 31, 2011, 09:09:36
3.7.4

http://sourceforge.net/projects/weka/files/weka-3-7/3.7.4/README-3-7-4.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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