[jira] [Created] (MAHOUT-1453) ImplicitFeedbackAlternatingLeastSquaresSolver add support for user supplied confidence functions

["Adam Ilardi (JIRA)" <ji...@apache.org>]

Adam Ilardi created MAHOUT-1453:
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             Summary: ImplicitFeedbackAlternatingLeastSquaresSolver add support for user supplied confidence functions
                 Key: MAHOUT-1453
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1453
             Project: Mahout
          Issue Type: Improvement
          Components: Collaborative Filtering
    Affects Versions: 0.9
            Reporter: Adam Ilardi
            Assignee: Sebastian Schelter
            Priority: Minor
             Fix For: 1.0


I added a test case for the YtY calculation code
I removed the indexes.quickSort() in the YtY calculation  because I don't think it's necessary and the test cases passed without it. The order shouldn't matter since you're adding the scalers together. Correct me if i'm wrong.

In Factorization.java I added methods to access the iterator of item ids and user ids directly. This saves memory when using classes like TopItems.java when you don't have the DataModel class in memory as well. 





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