def _check_no_sync_replicas_optimizer(optimizer):
  if isinstance(optimizer, sync_replicas_optimizer.SyncReplicasOptimizer):
    raise ValueError(
        "SyncReplicasOptimizer is not supported in DNNLinearCombined model. "
        "If you want to use this optimizer, please use either DNN or Linear "
        "model.") 

def _check_no_sync_replicas_optimizer(optimizer):
  if isinstance(optimizer, sync_replicas_optimizer.SyncReplicasOptimizer):
    raise ValueError(
        'SyncReplicasOptimizer does not support multi optimizers case. '
        'Therefore, it is not supported in DNNLinearCombined model. '
        'If you want to use this optimizer, please use either DNN or Linear '
        'model.')