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Posted to dev@mahout.apache.org by "Trevor Grant (JIRA)" <ji...@apache.org> on 2017/02/07 04:08:41 UTC

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

     [ https://issues.apache.org/jira/browse/MAHOUT-1936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Trevor Grant resolved MAHOUT-1936.
----------------------------------
    Resolution: Fixed

> 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
>            Assignee: 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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