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Posted to dev@mahout.apache.org by "Lance Norskog (Updated) (JIRA)" <ji...@apache.org> on 2012/01/08 04:00:40 UTC

[jira] [Updated] (MAHOUT-941) Improve ConfusionMatrix statistics

     [ https://issues.apache.org/jira/browse/MAHOUT-941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lance Norskog updated MAHOUT-941:
---------------------------------

    Summary: Improve ConfusionMatrix statistics  (was: Strip quoted text from emails and add statistics to ConfusionMatrix)


Rename this to focus on Confusion Matrix stats.
Stripper for quoted lines is added to [MAHOUT-939], removed from this patch. 
                
> Improve ConfusionMatrix statistics
> ----------------------------------
>
>                 Key: MAHOUT-941
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-941
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Classification
>            Reporter: Lance Norskog
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.6
>
>         Attachments: Bayes.zip, MAHOUT-941.patch, SGD.zip
>
>
> This patch does 2 things:
> # Add an feature to org.apache.mahout.text.SequenceFilesFromMailArchives that removes quoted text from email bodies. This is important because it avoid spamming the term dictionary with repeated text, especially in long email threads.
> ** The feature defaults to true. Add "--quoted" to the command line to keep the quoted lines.
> # Adds some dubious overall measurements to the ConfusionMatrix. 
> ** Kappa - a standard measurement. 
> *** How different is this confidence matrix from random numbers? 0.0 is the same, 1.0 is completely different.
> *** I think this is an "unweighted" kappa. 
> ** "Success" - a homegrown formula attempting to represent the correctness of each box. Probably bogus. 
> *** The standard deviation shows the distance between the success of each producer->consumer box.

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