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From "Sebastian Schelter (JIRA)" <>
Subject [jira] [Commented] (MAHOUT-1447) ImplicitFeedbackAlternatingLeastSquaresSolver tests and features
Date Tue, 11 Mar 2014 16:15:44 GMT


Sebastian Schelter commented on MAHOUT-1447:

Hi Adam,

yes the order of the keys shouldn't matter, good catch! Can you explain the rationale behind
 Factorization.getUserIdIterator() and getItemIdIterator() in more detail? I'm not sure I
completely understood it.

> ImplicitFeedbackAlternatingLeastSquaresSolver tests and features
> ----------------------------------------------------------------
>                 Key: MAHOUT-1447
>                 URL:
>             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 I added methods to access the iterator of item ids and user ids
directly. This saves memory when using classes like when you don't have the
DataModel class in memory as well. 

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