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https://issues.apache.org/jira/browse/MAHOUT-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13216228#comment-13216228
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Dave Kor edited comment on MAHOUT-952 at 2/25/12 2:52 AM:
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Yes, I am using weka's DenseInstance since my dataset have data values 99.9% of
the time.
I had a look at your patch and may I kindly suggest that a better fix would be
to add a try-catch block in MapBackedArffModel.processNumeric since, if I am
not wrong (can I could be), only missing numeric values are encoded as '?'.
was (Author: davekor):
Yes, I am using DenseInstance since my dataset have data values 99.9% of
the time. I had a look at your patch and may I kindly suggest that a better fix
would be to add a try-catch block in MapBackedArffModel.processNumeric since,
if I am not wrong (can I could be), only missing numeric values are encoded as
'?'.
> 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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