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https://issues.apache.org/jira/browse/MAHOUT-109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Tomsett updated MAHOUT-109:
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Attachment: CosineDistanceMeasurePatch.patch
> Implementation of Cosine distance measure, plus unit test.
> ----------------------------------------------------------
>
> Key: MAHOUT-109
> URL: https://issues.apache.org/jira/browse/MAHOUT-109
> Project: Mahout
> Issue Type: Improvement
> Reporter: Richard Tomsett
> Priority: Trivial
> Attachments: CosineDistanceMeasurePatch.patch
>
>
> This is a class implementing a cosine distance measure. In various places
> I've seen cosine *similarity* defined as being the cosine of the angle
> between vectors - cos(a,b) - and cosine *distance* being (1 - cos(a,b)), so
> in keeping with the other distance measures, this returns 1-cos(angle) as the
> distance.
> Made a new test class rather than using the default distance measure check as
> the vectors in the current default test class all have a cosine distance of
> zero between them ([1,1,1,1,1,1], [3,3,3,3,3,3] and [6,6,6,6,6,6]). The test
> checks the cosine distances between [1,0,0,0,0,0], [1,1,1,0,0,0] and
> [1,1,1,1,1,1].
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