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From "Sebastian Schelter (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (MAHOUT-642) Wrong parameter order in LoglikelihoodSimilarity and DistributedLoglikelihoodVectorSimilarity
Date Wed, 30 Mar 2011 19:38:06 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on MAHOUT-642 started by Sebastian Schelter.

> 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
>            Priority: Trivial
>             Fix For: 0.5
>
>
> 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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