It completes thoroughly the formulization of this method that Qin Jiushao limited the constant term in the numerical higher equation to be always negative.
As a sequel to the highest-grossing film ever, which was criticized for its formulaic story (and the surprisingly small ripple it had on pop culture), the new movie is a genuine surprise.
This is a problem formulation in which humans can overlook and control the learning process, which is going to be an increasingly important aspect of learning algorithms in the future.