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From "Sebastian Schelter (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAHOUT-628) Add an option to prune away users with less than a given number of preferences to ItemSimilarityJob and RecommenderJob
Date Fri, 18 Mar 2011 19:23:29 GMT
Add an option to prune away users with less than a given number of preferences to ItemSimilarityJob
and RecommenderJob
----------------------------------------------------------------------------------------------------------------------

                 Key: MAHOUT-628
                 URL: https://issues.apache.org/jira/browse/MAHOUT-628
             Project: Mahout
          Issue Type: New Feature
          Components: Collaborative Filtering
    Affects Versions: 0.5
            Reporter: Sebastian Schelter
            Assignee: Sebastian Schelter


Some real-world datasets (especially those created from implicit feedback) might include users
with only a tiny number of preferences (like one-time-visitors only viewing a single item)
that a users of ItemSimilarityJob or RecommenderJob might want to prune away. I added a new
parameter "minPrefsPerUser" that makes those jobs throw out users with less than a given number
of preferences. It is per default set to 1 so that the input data stays untouched.

It's just a small patch to make those jobs more usable in real-world scenarios.

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