9. The method of claim 8 , wherein the scoring is based on a derivative of a loss function.
8. The method of claim 7 , wherein selecting the update set of feature weights after a first iteration includes: scoring the feature weights in the classifier model using a training set, the classifier model including updates from a last iteration; and selecting feature weights into the update set based on at least one of: score magnitude, a score threshold, or a number of feature weights to be selected.