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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2011/03/30 16:15:06 UTC
[jira] [Updated] (MAHOUT-642) Wrong parameter order in
LoglikelihoodSimilarity and DistributedLoglikelihoodVectorSimilarity
[ https://issues.apache.org/jira/browse/MAHOUT-642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sebastian Schelter updated MAHOUT-642:
--------------------------------------
Affects Version/s: 0.5
> Wrong parameter order in LoglikelihoodSimilarity and DistributedLoglikelihoodVectorSimilarity
> ---------------------------------------------------------------------------------------------
>
> Key: MAHOUT-642
> URL: https://issues.apache.org/jira/browse/MAHOUT-642
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.5
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
>
> org.apache.mahout.math.stats.LogLikelihood.logLikelihoodRatio expects the following counts:
> * A and B together (k_11)
> * B without A (k_12)
> * A without B (k_21)
> * Neither A nor B (k_22)
> It seems to me that in org.apache.mahout.cf.taste.impl.similarity.LogLikelihoodSimilarity and org.apache.mahout.math.hadoop.similarity.vector.DistributedLoglikelihoodVectorSimilarity the counts of k_12 and k_21 are given in the wrong order (B without A should come before A without B)
>
> Can someone confirm that?
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