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https://issues.apache.org/jira/browse/MAHOUT-103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776951#action_12776951
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Sean Owen commented on MAHOUT-103:
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That last point is interesting. Another school of thought is that rating
something, even negatively, suggests you have a closer association to that
thing than to the millions of other things you've never heard of.
Let's say you rate Bach a 5 and Brahms a 4 and Mendelssohn a 1.5. Would you
rather recommend a Mendelssohn recording to this person, or death metal?
This is my understanding of the intuition I've gotten from Ted, and seems to
bear out somewhat in practice, that ratings have a lot less info than one would
think.
Well it's obviously something one can evaluate within the framework with the
evaluator code to decide for sure.
> Co-occurence based nearest neighbourhood
> ----------------------------------------
>
> Key: MAHOUT-103
> URL: https://issues.apache.org/jira/browse/MAHOUT-103
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering
> Reporter: Ankur
> Assignee: Ankur
> Attachments: jira-103.patch
>
>
> Nearest neighborhood type queries for users/items can be answered efficiently
> and effectively by analyzing the co-occurrence model of a user/item w.r.t
> another. This patch aims at providing an implementation for answering such
> queries based upon simple co-occurrence counts.
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