"LearningCurve First_fraction Bug"

Answers

• Options

  land RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 2,531 Unicorn

  October 2009

  Hi,
  this is not a bug, but instead the only possible behavior. You are logging the values from the parent operator. This operator will update it's values as soon as all inner operators have been executed. Since the ProcessLog is an inner operator, it tries to get this value before it's written the first time.
  You simply have to log the performance value of the Performance Operator itself. It should work with this process:

  <operator name="Root" class="Process" expanded="yes">
      <description text="This process plots the learning curve, i.e. the performance with respect to the number of examples which is used for learning."/>
      <parameter key="logverbosity"	value="warning"/>
      <parameter key="random_seed"	value="2004"/>
      <operator name="Iris" class="ArffExampleSource">
          <parameter key="data_file"	value="C:\rm_workspace\sample\data\iris.arff"/>
          <parameter key="label_attribute"	value="class"/>
      </operator>
      <operator name="split at 90%, step 5%" class="LearningCurve" expanded="yes">
          <parameter key="training_ratio"	value="0.6"/>
          <parameter key="start_fraction"	value="0.0"/>
          <operator name="OperatorChain" class="OperatorChain" expanded="yes">
              <operator name="W-J48" class="W-J48">
                  <parameter key="keep_example_set"	value="true"/>
              </operator>
          </operator>
          <operator name="ApplierChain" class="OperatorChain" expanded="yes">
              <operator name="ModelApplier" class="ModelApplier">
                  <list key="application_parameters">
                  </list>
              </operator>
              <operator name="ClassificationPerformance" class="ClassificationPerformance">
                  <parameter key="accuracy"	value="true"/>
                  <list key="class_weights">
                  </list>
              </operator>
          </operator>
          <operator name="ProcessLog" class="ProcessLog">
              <list key="log">
                <parameter key="performance"	value="operator.ClassificationPerformance.value.accuracy"/>
                <parameter key="fraction"	value="operator.split at 90%, step 5%.value.fraction"/>
              </list>
          </operator>
      </operator>
  </operator>
  

  Greetings,
    Sebastian

  0