Apache Mahout is an Apache Software Foundation project with the goal of creating both a community of users and a scalable, Java-based framework consisting of many machine learning algorithm implementations. The project currently has map-reduce enabled (via Apache Hadoop) implementations of several clustering algorithms (k-Means, Mean-Shift, Fuzzy k-Means, Dirichlet, Canopy), Naïve Bayes and Complementary Naïve Bayes classifiers, collaborative filtering, as well as support for distributed evolutionary computing. We are also planning implementations of neural nets, expectation maximization, hierarchical clustering, Support Vector Machines, regression techniques, and Principal Component Analysis, amongst others.
- Changes to previous version:
First official public release
Other available revisons
Version Changelog Date 0.8
Apache Mahout 0.8 contains, amongst a variety of performance improvements and bug fixes, an implementation of Streaming K-Means, deeper Lucene/Solr integration and new scalable recommender algorithms. For a full description of the newest release, see http://mahout.apache.org/.
July 27, 2013, 15:52:32 0.4
We are pleased to announce release 0.4 of Mahout. Virtually every corner of the project has changed, and significantly, since 0.3. Developers are invited to use and depend on version 0.4 even as yet more change is to be expected before the next release. Highlights include:
* Model refactoring and CLI changes to improve integration and consistency * New ClusterEvaluator and CDbwClusterEvaluator offer new ways to evaluate clustering effectiveness * New Spectral Clustering and MinHash Clustering (still experimental) * New VectorModelClassifier allows any set of clusters to be used for classification * Map/Reduce job to compute the pairwise similarities of the rows of a matrix using a customizable similarity measure * Map/Reduce job to compute the item-item-similarities for item-based collaborative filtering * RecommenderJob has been evolved to a fully distributed item-based recommender * Distributed Lanczos SVD implementation * More support for distributed operations on very large matrices * Easier access to Mahout operations via the command line * New HMM based sequence classification from GSoC (currently as sequential version only and still experimental) * Sequential logistic regression training framework * New SGD classifier * Experimental new type of NB classifier, and feature reduction options for existing one * New vector encoding framework for high speed vectorization without a pre-built dictionary * Additional elements of supervised model evaluation framework * Promoted several pieces of old Colt framework to tested status (QR decomposition, in particular) * Can now save random forests and use it to classify new data * Many, many small fixes, improvements, refactorings and cleanup
November 2, 2010, 04:28:34 0.3
Added distributed (Map/Reduce) Singular Value Decomposition and Map/Reduce collocations. New high performance collections and matrix/vector libraries (based on Colt with many enhancements). Many new utilities for converting content to Mahout format. See http://lucene.apache.org/mahout/#17+March+2010+-+Apache+Mahout+0.3+released for more details.
April 19, 2010, 14:20:16 0.2
Focus on performance and cleanup of APIs on the way to a 1.0 release. Added several new algorithms (LDA, Frequent Patternset Mining, Random Decision Forests). See 0.2 release announcement: http://lucene.apache.org/mahout/index.html#17+Nov.+2009+-+Apache+Mahout+0.2+released
January 3, 2010, 22:33:30 0.1
First official public release
September 30, 2008, 01:58:55
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