Attribute filter

Hi there,

Look into the IOObjects, using which you can store your example set, and then repeatedly butcher and resurrect it, as in the following....

<operator name="Root" class="Process" expanded="yes">
    <operator name="Generate 100 Examples Numerical label, 5 numerical, 5 nominal attributes" class="OperatorChain" expanded="no">
        <operator name="Generate Regression Problem" class="ExampleSetGenerator">
            <parameter key="target_function"	value="polynomial"/>
        </operator>
        <operator name="IdTagging" class="IdTagging">
        </operator>
        <operator name="Generate Nominal Attributes" class="NominalExampleSetGenerator">
            <parameter key="number_of_values"	value="2"/>
        </operator>
        <operator name="IdTagging 2" class="IdTagging">
        </operator>
        <operator name="ExampleSetJoin" class="ExampleSetJoin">
            <parameter key="remove_double_attributes"	value="false"/>
        </operator>
        <operator name="Store the combined data set" class="IOStorer">
            <parameter key="name"	value="AllData"/>
            <parameter key="io_object"	value="ExampleSet"/>
        </operator>
    </operator>
    <operator name="Get back a COPY of the Data set" class="IORetriever">
        <parameter key="name"	value="AllData"/>
        <parameter key="io_object"	value="ExampleSet"/>
        <parameter key="remove_from_store"	value="false"/>
    </operator>
    <operator name="Remove nominal attributes" class="FeatureValueTypeFilter">
    </operator>
    <operator name="LinearRegression" class="LinearRegression">
        <parameter key="keep_example_set"	value="true"/>
        <parameter key="eliminate_colinear_features"	value="false"/>
        <parameter key="use_bias"	value="false"/>
    </operator>
    <operator name="ModelApplier" class="ModelApplier">
        <list key="application_parameters">
        </list>
    </operator>
    <operator name="Get another COPY of the whole dataset" class="IORetriever">
        <parameter key="name"	value="AllData"/>
        <parameter key="io_object"	value="ExampleSet"/>
        <parameter key="remove_from_store"	value="false"/>
    </operator>
    <operator name="Restore the Nominals" class="ExampleSetJoin">
    </operator>
</operator>

Hi,
that's one possibility, but in some cases this effort isn't needed: If you only want to have an attribute subset temporarily, you could use the AttributeSubsetPreprocessing Operator. It will deliver the subset to the inner operators and re-add the other operators to the resulting example set.

Greetings,
  Sebastian