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