Changed the termination condition for Schur-Newton, as the current condition forces an early exit if the error starts increasing. However in Schur-Newton the error does not decline monotonically - it may bounce around for a while before entering the Newton quadratic basin and falling to 0 quadratically.
Changed the termination condition for Schur-Newton, as the current condition forces an early exit if the error starts increasing. However in Schur-Newton the error does not decline monotonically - it may bounce around for a while before entering the Newton quadratic basin and falling to 0 quadratically.

PiperOrigin-RevId: 316115207

tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo