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https://issues.apache.org/jira/browse/MAHOUT-1189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Filimon resolved MAHOUT-1189.
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Resolution: Fixed
Fix Version/s: 0.8
Committed revision 1478733.
> CosineDistanceMeasure doesn't return 0 for two 0 vectors
> --------------------------------------------------------
>
> Key: MAHOUT-1189
> URL: https://issues.apache.org/jira/browse/MAHOUT-1189
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Dan Filimon
> Priority: Minor
> Fix For: 0.8
>
>
> CosineDistanceMeasure for two equal vectors should always return 0 like for
> any other distance measure, however it returns 1.
> This patch fixes this issue.
> Also, note that it's not necessarily obvious what the return value should be
> since the cosine of two 0-length vectors isn't defined.
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