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https://issues.apache.org/jira/browse/MAHOUT-389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated MAHOUT-389:
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Issue Type: Improvement (was: Bug)
Priority: Minor (was: Major)
I should add you could emulate the behavior you may desire in the
non-distributed implementation with a combination of the
UncenteredCosineSimilarity, and a PreferenceInferrer which always infers 0.
I don't see a simple way to make the distributed version emulate the
non-distributed version.
While I think the non-distributed version has preferable semantics, neither is
really "wrong". I suggesting leaving this as more of an improvement idea to
figure out a way to unify them, by modifying the distributed version.
> 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.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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