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https://issues.apache.org/jira/browse/MAHOUT-389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864812#action_12864812
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Sean Owen commented on MAHOUT-389:
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I'm happy to commit this since it looks fine, suits your purposes as an active
user, and remains reusable. I might make minor changes like not making CoRating
an inner class of an interface, and just making it Writable rather than
separate the Writable wrapper.
> UncenteredCosineSimilarity
> ---------------------------
>
> Key: MAHOUT-389
> URL: https://issues.apache.org/jira/browse/MAHOUT-389
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Reporter: Sebastian Schelter
> Priority: Minor
> Attachments: MAHOUT-389-2.patch, MAHOUT-389-3.patch, MAHOUT-389.patch
>
>
> org.apache.mahout.cf.taste.impl.similarity.UncenteredCosineSimilarity only
> computes the cosine distance between those components of the vectors where
> both vectors have a value greater zero.
> This is inconsistent with the definition of the cosine (correct me if I'm
> wrong) and is inconsistent with the distributed cosine similarity computation.
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