5. The system of claim 4 , a first primitive operator in the decision tree is a cross product between two relations, and subsequent primitive operators are selected by the generation component based on an amount of error reduced by the first primitive operator with respect to the example pairs.
5. The system of claim 4 , a first primitive operator in the decision tree is a cross product between two relations, and subsequent primitive operators are selected by the generation component based on an amount of error reduced by the first primitive operator with respect to the example pairs. 6. The system of claim 5 , the generation component labels the decision tree leaves as either a match or a non-match.