message: change tuple list type
diff: @@ -1461,15 +1461,15 @@ class _SingleWorkerDatasetIteratorBase(object):
  raise NotImplementedError("must be implemented in descendants")
  def _format_data_list_with_options(self, data_list):
  - """Change the data list to tuple type if required
  - The OwnedMultiDeviceIterator returns the tuple data type,
  + """Change the data in to a list type if required
  + The OwnedMultiDeviceIterator returns the list data type,
  while the PER_REPLICA iterator (when used with prefetch disabled)
  - returns without the enclosed tuple. This is to fix the inconsistency.
  + returns without the enclosed list. This is to fix the inconsistency.
  """
  if (self._options
  and self._options.experimental_replication_mode == InputReplicationMode.PER_REPLICA
  and not self._options.experimental_prefetch_to_device):
  - return tuple((data_list,))
  + return [data_list]
  else:
  return data_list
  