Wrong parameter order in LoglikelihoodSimilarity and
DistributedLoglikelihoodVectorSimilarity
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Key: MAHOUT-642
URL: https://issues.apache.org/jira/browse/MAHOUT-642
Project: Mahout
Issue Type: Bug
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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