metacost and stacking

cgkolar

Hello.  I have been able to successfully use MetaCost with decision tree, neural net, and Bayesian models.  I am looking at the stacking feature and trying to figure out how to work with it and metacost.  I don't seem to be able to embed Stacking within the MC operator, and I can't seem to wrap any of the stacked operators withing MC within the stacking operator.  I am wondering if my problem is technical, or if I am trying to do something that is conceptually inappropriate.  Cheers,  --chris

steffen

Hello cgkolar

Hm ... I must admit I do not understand the problem. I tried the following setup...

<operator name="Root" class="Process" expanded="yes">
    <operator name="ExampleSource" class="ExampleSource">
        <parameter key="attributes"	value="iris.aml"/>
    </operator>
    <operator name="MetaCost" class="MetaCost" expanded="yes">
        <parameter key="cost_matrix"	value="[0.0 1.0 1.0;1.0 0.0 1.0;1.0 1.0 0.0]"/>
        <operator name="Stacking" class="Stacking" expanded="yes">
            <operator name="NaiveBayes" class="NaiveBayes">
            </operator>
            <operator name="DecisionTree" class="DecisionTree">
            </operator>
        </operator>
    </operator>
</operator>

...which worked without any problems.

Please help if I got you wrong

greetings

Steffen