2. The method of claim 1 wherein generating a classifier comprises: selecting a classifier function by optimizing a cost function that penalizes differences between the target function value and a classifier function value for the training nodes.
2. The method of claim 1 wherein generating a classifier comprises: selecting a classifier function by optimizing a cost function that penalizes differences between the target function value and a classifier function value for the training nodes. 3. The method of claim 2 wherein generating a classifier comprises: selecting the classifier function by optimizing the cost function, wherein the cost function also penalizes differences between classifier function values calculated for different nodes in the graphical representations.