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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853929#action_12853929
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Sean Owen commented on MAHOUT-358:
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Maybe it also clarifies to say: those valus are *not* estimated preferences.
They can be very large; they are not supposed to be in a certain range.
The negative values make sense if you have negative ratings, and I suppose we
should allow for that.
In that case, your results seem correct. The only change you may want then is
to output very large or small numbers in scientific notation instead of a long
string. I can make that change easily.
> 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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