[jira] [Created] (MAHOUT-1936) FactorMap finds column maximums incorrectly on large data sets

[Trevor Grant (JIRA)]

Trevor Grant created MAHOUT-1936:
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             Summary: FactorMap finds column maximums incorrectly on large data 
sets
                 Key: MAHOUT-1936
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1936
             Project: Mahout
          Issue Type: Bug
          Components: Algorithms
    Affects Versions: 0.13.0
            Reporter: Trevor Grant
             Fix For: 0.13.0


FactorMap's fit method does not properly find the maximum of the column. 

Likely due to an impropper allreduceBlock here
https://github.com/apache/mahout/blob/master/math-scala/src/main/scala/org/apache/mahout/math/algorithms/preprocessing/AsFactor.scala#L40

Also, factorMap in this instance might be more appropriately named "factorMax"



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