[jira] [Commented] (MAHOUT-952) ARFFVectorIterable/MapBackedArffModel doesn't handle question mark '?', other ARFF issues

["Dave Kor (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13211682#comment-13211682 ] 

Dave Kor commented on MAHOUT-952:
---------------------------------

I am facing a similar issue here. Assuming the missing values aren't very important, you can create a .arff that does not contain missing values using Weka's ReplaceMissingValues filter to replace missing values with the attribute's mean.

                
> ARFFVectorIterable/MapBackedArffModel doesn't handle question mark '?', other ARFF issues
> -----------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-952
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-952
>             Project: Mahout
>          Issue Type: Bug
>          Components: Integration
>    Affects Versions: 0.6
>         Environment: Latest SVN on ubuntu
>            Reporter: Stuart Smith
>            Priority: Minor
>              Labels: ARFF
>
> Whatever is parsing the ARFF file for the ARFFVectorIterable (As far as I can tell, it's the class itself) doesn't handle '?' as a marker for unknown value. See: http://www.cs.waikato.ac.nz/~ml/weka/arff.html  
> I just started looking at Mahout classifiers this week, so I'm not sure how to handle this yet. If I figure it out, I'll post a patch, but until then, guidance would be helpful!

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