code: def get_maybe_base_expanded_node_name(self, node_name, run_key, device_name):
      
      device_name = tf.compat.as_str(device_name)
      if run_key not in self._run_key_to_original_graphs:
        raise ValueError('Unknown run_key: %s' % run_key)
      if device_name not in self._run_key_to_original_graphs[run_key]:
        raise ValueError(
            'Unknown device for run key "%s": %s' % (run_key, device_name))
      return self._run_key_to_original_graphs[
          run_key][device_name].maybe_base_expanded_node_name(node_name)
docs: Obtain possibly base-expanded node name.
  
      Base-expansion is the transformation of a node name which happens to be the
      name scope of other nodes in the same graph. For example, if two nodes,
      called 'a/b' and 'a/b/read' in a graph, the name of the first node will
      be base-expanded to 'a/b/(b)'.
  
      This method uses caching to avoid unnecessary recomputation.
  
      Args:
        node_name: Name of the node.
        run_key: The run key to which the node belongs.
        graph_def: GraphDef to which the node belongs.
  
      Raises:
        ValueError: If `run_key` and/or `device_name` do not exist in the record.