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