code: def _restore_momentum_if_needed(self):
      if self.restore_momentum:
          self.backend.set_value(
              self.model.optimizer.momentum, self.restore_momentum
          )
          self.restore_momentum = None
  
imports: from packaging import version
  import warnings
  import horovod.tensorflow
  import tensorflow
label_desc: Use image node_id 4 for calling the LearningRateScheduleCallbackImpl obj's underlying member method code with example usage: obj._restore_momentum_if_needed() without return types