Add a schedule LinearRampupExponentialDecay, which is a shortcut to LinearRampupExponentialDecayScaledByNumSplitSchedule with num_splits=1.
Add a schedule LinearRampupExponentialDecay, which is a shortcut to LinearRampupExponentialDecayScaledByNumSplitSchedule with num_splits=1.

PiperOrigin-RevId: 265765307

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