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From "Sebastian Schelter (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (MAHOUT-1089) SGD matrix factorization for rating prediction with user and item biases
Date Sun, 30 Sep 2012 21:04:07 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebastian Schelter reassigned MAHOUT-1089:
------------------------------------------

    Assignee: Sebastian Schelter  (was: Sean Owen)
    
> SGD matrix factorization for rating prediction with user and item biases
> ------------------------------------------------------------------------
>
>                 Key: MAHOUT-1089
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1089
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Collaborative Filtering
>            Reporter: Zeno Gantner
>            Assignee: Sebastian Schelter
>
> A matrix factorization that is trained with standard SGD on all features at the same
time, in contrast to ExpectationMaximizationFactorizer, which learns feature by feature.
> Additionally to the free features it models a rating bias for each user and item.

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