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From Sean Owen <>
Subject Apache Mahout 0.5 released
Date Thu, 02 Jun 2011 07:25:05 GMT
Apache Mahout has reached version 0.5. All developers are encouraged to
begin using version 0.5, as again much has changed and been fixed since
version 0.4. Many APIs have been changed, added or removed, and will
continue before version 1.0. Highlights of version 0.5 include:

   - Improved Lanczos solver: graceful restarts, better scalability
   - LDA improvements: document-topic distribution output, graceful restarts
   - Stochastic Singular Value Decomposition implementation
   - Incremental SVD implementation
   - Alternating Least Squares with Weighted Regularization collaborative
   filtering implementation, both distributed and non-distributed
   - SVDRecommender enhancements
   - Initial work at merging clustering and classification infrastructure
   - Better control over candidate item selection in item-based recommenders
   - Significant removal of deprecated or dead code
   - Many bug fixes, refactorings and other small improvements

Changes in 0.5 are detailed in the release notes (

Downloads of all releases are available from Apache Mirrors (


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