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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852785#action_12852785
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Sean Owen commented on MAHOUT-358:
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Having decimal values is normal. Negative values are bizarre though. The
co-occurrence matrix and user vector should have nonnegative values, so I can't
see how it gets a negative element from multiplications and additions. I don't
see any obvious problems with the logic.
I wonder if you can debug, look at the cooccurrence matrix and/or user vectors?
make sure neither has negative values?
I'm trying to imagine wild scenarios, like overflowing an int in the
cooccurrence matrix? but you don't have billions of users...
> 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
>
>
> In my test the input pref values all is positive.
> the output score value has negative value ,
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