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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854432#action_12854432
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Sean Owen commented on MAHOUT-358:
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The output is helpful. I am more confused, we may be talking about different
things. userID could well be negative. It's a long. What is your input like?
how are you mapping user IDs to longs? That is not a problem per se, but I
would like to understand what your user IDs are like.
Earlier your output showed negative *values*, not *IDs*, and that is something
I can't figure out. But we don't see that here.
Actually, this output seems correct to me.
Which are you talking about Sebastian?
I can't quite understand why you would see more than 10 recommendations since
as you see, the queue is kept to this size in the code above. I can try one or
two more changes that try to make the code even more straightforward (e.g.
moving the ordering logic in a Comparator, not reusing Writables in case
something strange goes on there.)
Is the change to Text really a solution -- I am not yet clear we're talking
about the same issue. I can't see how this changes behavior. We're already
seeing that RecommendedItemsWrtiable.toString() is being invoked. I do not see
how String.valueOf(long) could return the 'right' value, but
StringBuffer.append(long) the 'wrong' value. They're calling into the same
java.lang code in the end.
Very very confused here, esp since I cannot reproduce this.
Could it be a Hadoop version issue? I'm on 0.20.2.
I will commit any wild-guess changes I can here in a minute in an effort to
shed any light.
> 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: 20100407_steer_item_out_part-00000,
> attempt_201004011623_0070_m_000000_0.htm, 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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