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From "Dave Kor (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-952) ARFFVectorIterable/MapBackedArffModel doesn't handle question mark '?', other ARFF issues
Date Sat, 25 Feb 2012 01:39:48 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13216228#comment-13216228
] 

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

Yes, I am using DenseInstance since my dataset have data values 99.9% of the time. On a related
note, I just found another bug with ArffVectorIterable breaking down when the .arff file contain
instance weights. I will open a new issue for this. 

                
> 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
>         Attachments: MAHOUT-952.patch
>
>
> 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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