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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2012/09/30 19:42:07 UTC

[jira] [Created] (MAHOUT-1087) ExpectationMaximizationSVDFactorizer doesn't do expectation maximization

Sebastian Schelter created MAHOUT-1087:
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             Summary: ExpectationMaximizationSVDFactorizer doesn't do expectation maximization
                 Key: MAHOUT-1087
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1087
             Project: Mahout
          Issue Type: Improvement
          Components: Collaborative Filtering
            Reporter: Sebastian Schelter
            Assignee: Sean Owen


This factorizer simply implements the user and item features via SGD as described in Simon Funk's famous blogpost, which is not expectation maximization, so I suggest we rename it to FunkSVD.

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[jira] [Updated] (MAHOUT-1087) ExpectationMaximizationSVDFactorizer doesn't do expectation maximization

Posted by "Sebastian Schelter (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/MAHOUT-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter updated MAHOUT-1087:
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    Description: This factorizer simply learns the user and item features via SGD as described in Simon Funk's famous blogpost, which is not expectation maximization, so I suggest we rename it to FunkSVD.  (was: This factorizer simply implements the user and item features via SGD as described in Simon Funk's famous blogpost, which is not expectation maximization, so I suggest we rename it to FunkSVD.)
    
> ExpectationMaximizationSVDFactorizer doesn't do expectation maximization
> ------------------------------------------------------------------------
>
>                 Key: MAHOUT-1087
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1087
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>            Reporter: Sebastian Schelter
>            Assignee: Sean Owen
>
> This factorizer simply learns the user and item features via SGD as described in Simon Funk's famous blogpost, which is not expectation maximization, so I suggest we rename it to FunkSVD.

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[jira] [Commented] (MAHOUT-1087) ExpectationMaximizationSVDFactorizer doesn't do expectation maximization

Posted by "Hudson (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/MAHOUT-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466585#comment-13466585 ] 

Hudson commented on MAHOUT-1087:
--------------------------------

Integrated in Mahout-Quality #1681 (See [https://builds.apache.org/job/Mahout-Quality/1681/])
    MAHOUT-1087 ExpectationMaximizationSVDFactorizer doesn't do expectation maximization (Revision 1392112)

     Result = FAILURE
ssc : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1392112
Files : 
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/recommender/svd/ExpectationMaximizationSVDFactorizer.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/recommender/svd/FunkSVDFactorizer.java

                
> ExpectationMaximizationSVDFactorizer doesn't do expectation maximization
> ------------------------------------------------------------------------
>
>                 Key: MAHOUT-1087
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1087
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>            Reporter: Sebastian Schelter
>            Assignee: Sean Owen
>
> This factorizer simply learns the user and item features via SGD as described in Simon Funk's famous blogpost, which is not expectation maximization, so I suggest we rename it to FunkSVD.

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[jira] [Resolved] (MAHOUT-1087) ExpectationMaximizationSVDFactorizer doesn't do expectation maximization

Posted by "Sebastian Schelter (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/MAHOUT-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter resolved MAHOUT-1087.
----------------------------------------

    Resolution: Fixed
    
> ExpectationMaximizationSVDFactorizer doesn't do expectation maximization
> ------------------------------------------------------------------------
>
>                 Key: MAHOUT-1087
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1087
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>            Reporter: Sebastian Schelter
>            Assignee: Sean Owen
>
> This factorizer simply learns the user and item features via SGD as described in Simon Funk's famous blogpost, which is not expectation maximization, so I suggest we rename it to FunkSVD.

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