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https://issues.apache.org/jira/browse/MAHOUT-1189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650472#comment-13650472
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Hudson commented on MAHOUT-1189:
--------------------------------
Integrated in Mahout-Quality #1983 (See
[https://builds.apache.org/job/Mahout-Quality/1983/])
Fixes MAHOUT-1189
https://issues.apache.org/jira/browse/MAHOUT-1189 (Revision 1478733)
Result = SUCCESS
dfilimon :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1478733
Files :
*
/mahout/trunk/core/src/main/java/org/apache/mahout/common/distance/CosineDistanceMeasure.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/clustering/iterator/TestClusterClassifier.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/common/distance/CosineDistanceMeasureTest.java
> 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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