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From "Sean Owen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-821) MemoryDiffStorage mistake in recommendable items method
Date Wed, 28 Sep 2011 07:40:45 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116271#comment-13116271
] 

Sean Owen commented on MAHOUT-821:
----------------------------------

Hmm, not sure I see the bug. The logic looks correct. Recommendable items are all items that
the user does not already know about. So, an item is removed if there is a non-null pref from
the user for that item. Which test here would test this -- it should not work if changed this
way.
                
> MemoryDiffStorage mistake in recommendable items method
> -------------------------------------------------------
>
>                 Key: MAHOUT-821
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-821
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Lance Norskog
>            Priority: Minor
>         Attachments: short.patch
>
>
> The MemoryDiffStorage class has a "positive/negative" bug in building a list of "recommendable
items". Attached patch fixes the bug and includes updates for various unit tests. 

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