"Bagging regression trees: Bagging and W-M5P"

nicugeorgian
nicugeorgian New Altair Community Member
edited November 5 in Community Q&A
Hello,

How can I apply bagging to the M5P algorithm, i.e., how can I use the operators Bagging and W-M5P together?

I use W-M5P to predict, by means of a regression tree, a numerical label based on polynomial and numerical attributes.

If I use W-M5P as an inner operator of the Bagging operator, 

<operator name="Bagging" class="Bagging" expanded="yes">
         <operator name="W-M5P" class="W-M5P">
                <parameter key="M"	value="10.0"/>
                <parameter key="N"	value="true"/>
                <parameter key="R"	value="true"/>
         </operator>
</operator>
then the process complains, saying that Bagging is not able to support numerical labels  :(

Any ideas?

Thanks,
Geo
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Answers

  • IngoRM
    IngoRM New Altair Community Member
    Hi Geo,

    the reason why this does not work is quite simple: in the current version, bagging does not support numerical labels (regression problems) but classification tasks only. I have just changed that and numerical labels are now also supported by bagging. You can access this imrpoved version via CVS (described here: http://rapid-i.com/content/view/25/48/ ). Users of the RapidMiner Enterprise Edition will get this improvement with the next automatic update. And of course this change will also be part of the next release.

    Cheers,
    Ingo

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