"Decision Tree Model Not Visible"

hgwelec

Hello again,



I am trying to use a decision tree learner for a problem.  If i run the stream with just the input file node and the decision tree learner, the resulting decision tree is shown fine. However when i run the following stream (essentially i perform cross-validation), i cannot see the resulting tree (and hence the resulting model). Here is the setup :

<operator name="Root" class="Process" expanded="yes">
    <operator name="CSVExampleSource" class="CSVExampleSource">
        <parameter key="filename" value="D:\MyDocumentsr\kvltrain.csv"/>
        <parameter key="label_name" value="zkvl"/>
    </operator>
    <operator name="FeatureNameFilter" class="FeatureNameFilter">
        <parameter key="skip_features_with_name" value="(Age|Profession)"/>
    </operator>
    <operator name="XValidation" class="XValidation" expanded="yes">
        <operator name="DecisionTree" class="DecisionTree">
            <parameter key="keep_example_set" value="true"/>
        </operator>
        <operator name="OperatorChain" class="OperatorChain" expanded="yes">
            <operator name="ModelApplier" class="ModelApplier">
                <list key="application_parameters">
                </list>
            </operator>
            <operator name="ClassificationPerformance" class="ClassificationPerformance">
                <parameter key="absolute_error" value="true"/>
                <parameter key="accuracy" value="true"/>
                <list key="class_weights">
                </list>
                <parameter key="classification_error" value="true"/>
                <parameter key="normalized_absolute_error" value="true"/>
                <parameter key="root_mean_squared_error" value="true"/>
                <parameter key="root_relative_squared_error" value="true"/>
            </operator>
        </operator>
    </operator>
    <operator name="ProcessLog" class="ProcessLog">
        <parameter key="filename" value="D:\Programs\Rapid-I\rm_workspace\logger.log"/>
        <list key="log">
          <parameter key="accuracy" value="operator.CSVExampleSource.value.null"/>
        </list>
    </operator>
    <operator name="GnuplotWriter" class="GnuplotWriter">
        <parameter key="additional_parameters" value="set grid"/>
        <parameter key="name" value="ProcessLog"/>
        <parameter key="output_file" value="D:\Programs\Rapid-I\rm_workspace\log.gnu"/>
        <parameter key="values" value="accuracy"/>
        <parameter key="x_axis" value="accuracy"/>
    </operator>
</operator>



Any idea as to why this is happening?



Thanks,


Harry

hgwelec

Ok found out what happened : The Model gets consumed (?) in the first operator of cross validation. However if i save the model first and then read it at the end of the process chain, the decision tree shows fine :


Here is the setup :

<operator name="Root" class="Process" expanded="yes">
    <operator name="CSVExampleSource" class="CSVExampleSource">
        <parameter key="filename" value="D:\MyDocuments\kvltrain.csv"/>
        <parameter key="label_name" value="zkvl"/>
    </operator>
    <operator name="FeatureNameFilter" class="FeatureNameFilter">
        <parameter key="skip_features_with_name" value="(Age|Profession)"/>
    </operator>
    <operator name="XValidation" class="XValidation" expanded="yes">
        <parameter key="number_of_validations" value="3"/>
        <operator name="OperatorChain (2)" class="OperatorChain" expanded="yes">
            <operator name="DecisionTree" class="DecisionTree">
                <parameter key="keep_example_set" value="true"/>
            </operator>
            <operator name="ModelWriter" class="ModelWriter">
                <parameter key="model_file" value="D:\Programs\Rapid-I\rm_workspace\model.mod"/>
            </operator>
        </operator>
        <operator name="OperatorChain" class="OperatorChain" expanded="yes">
            <operator name="ModelApplier" class="ModelApplier">
                <list key="application_parameters">
                </list>
            </operator>
            <operator name="ClassificationPerformance" class="ClassificationPerformance">
                <parameter key="absolute_error" value="true"/>
                <parameter key="accuracy" value="true"/>
                <list key="class_weights">
                </list>
                <parameter key="classification_error" value="true"/>
                <parameter key="normalized_absolute_error" value="true"/>
                <parameter key="root_mean_squared_error" value="true"/>
                <parameter key="root_relative_squared_error" value="true"/>
            </operator>
        </operator>
    </operator>
    <operator name="ProcessLog" class="ProcessLog">
        <parameter key="filename" value="D:\Programs\Rapid-I\rm_workspace\logger.log"/>
        <list key="log">
          <parameter key="accuracy" value="operator.CSVExampleSource.value.null"/>
        </list>
    </operator>
    <operator name="GnuplotWriter" class="GnuplotWriter">
        <parameter key="additional_parameters" value="set grid"/>
        <parameter key="name" value="ProcessLog"/>
        <parameter key="output_file" value="D:\Programs\Rapid-I\rm_workspace\log.gnu"/>
        <parameter key="values" value="accuracy"/>
        <parameter key="x_axis" value="accuracy"/>
    </operator>
    <operator name="ModelLoader" class="ModelLoader">
        <parameter key="model_file" value="D:\Programs\Rapid-I\rm_workspace\model.mod"/>
    </operator>
</operator>