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Posted to dev@mahout.apache.org by "Remi Melisson (Commented) (JIRA)" <ji...@apache.org> on 2011/12/04 14:09:40 UTC
[jira] [Commented] (MAHOUT-902) TanimotoCoefficientSimilarity
should return Double.NaN for two items that have zero overlap
[ https://issues.apache.org/jira/browse/MAHOUT-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13162393#comment-13162393 ]
Remi Melisson commented on MAHOUT-902:
--------------------------------------
Hi,
Maybe, I misunderstand the description but it seems to be the case :
(line 77)
http://svn.apache.org/viewvc/mahout/trunk/core/src/main/java/org/apache/mahout/cf/taste/impl/similarity/TanimotoCoefficientSimilarity.java?view=markup
tested by :
(testNoCorrelation)
http://svn.apache.org/viewvc/mahout/trunk/core/src/test/java/org/apache/mahout/cf/taste/impl/similarity/TanimotoCoefficientSimilarityTest.java?view=markup
Correct me if I'm wrong.
> TanimotoCoefficientSimilarity should return Double.NaN for two items that have zero overlap
> -------------------------------------------------------------------------------------------
>
> Key: MAHOUT-902
> URL: https://issues.apache.org/jira/browse/MAHOUT-902
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.6
> Reporter: Sebastian Schelter
> Labels: MAHOUT_INTRO_CONTRIBUTE
>
> org.apache.mahout.cf.taste.impl.similarity.TanimotoCoefficientSimilarity should return Double.NaN for two items that have zero overlap. Please also provide a unit-test for this.
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