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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853982#action_12853982
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Sean Owen commented on MAHOUT-358:
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That is truly strange then. The user vectors have nonnegative values, and so
does the co-occurrence matrix. Their product can't have negative values.
Something is going wrong somewhere in there.
I can't reproduce to check without your data, though if you're in a position to
debug, you'll have to see why user vectors or the matrix has negative values. I
have looked at the code many times and do not see a way this can happen.
> the pref value field of output of
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob has negative
> -----------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-358
> URL: https://issues.apache.org/jira/browse/MAHOUT-358
> Project: Mahout
> Issue Type: Test
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
> Attachments: screenshot-1.jpg, screenshot-2.jpg
>
>
> In my test the input pref values all is positive.
> the output score value has negative value ,
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