8. The system of claim 1 , wherein: the plurality of transformation rules are generated from training data; and further comprising assembling at least a part of the plurality of transformation rules into a rules index based at least in part on the weights.
8. The system of claim 1 , wherein: the plurality of transformation rules are generated from training data; and further comprising assembling at least a part of the plurality of transformation rules into a rules index based at least in part on the weights. 9. The system of claim 8 , wherein the training data comprises string pairs.