I'm trying to provide Parameters to the weka classifiers via the FlowVariables. As there is only 'Serialized Classifier', I assume I have to use that flow variable? What form of String do I provide? I tried all kinds of weka lines e.g. MultilayerPerceptron -B -C - E 100 etc, could you provide an example? I can't find any documentation about how to acces that Flow Variable.