Dan Filimon created MAHOUT-1189:
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Summary: 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
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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