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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2010/05/04 17:18:55 UTC
[jira] Updated: (MAHOUT-389) UncenteredCosineSimilarity
[ https://issues.apache.org/jira/browse/MAHOUT-389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sebastian Schelter updated MAHOUT-389:
--------------------------------------
Attachment: MAHOUT-389.patch
Unit test attached.
> UncenteredCosineSimilarity
> ---------------------------
>
> Key: MAHOUT-389
> URL: https://issues.apache.org/jira/browse/MAHOUT-389
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Reporter: Sebastian Schelter
> 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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