[jira] [Resolved] (MAHOUT-1447) ImplicitFeedbackAlternatingLeastSquaresSolver tests and features

["Sebastian Schelter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter resolved MAHOUT-1447.
----------------------------------------

    Resolution: Fixed

> ImplicitFeedbackAlternatingLeastSquaresSolver tests and features
> ----------------------------------------------------------------
>
>                 Key: MAHOUT-1447
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1447
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.9
>            Reporter: Adam Ilardi
>            Assignee: Sebastian Schelter
>            Priority: Minor
>              Labels: newbie, patch, performance
>             Fix For: 1.0
>
>         Attachments: MAHOUT-1447.patch
>
>
> 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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