code: def _if_add_node(
      self, node: EntityType, visited: Set
  ):  # pylint: disable=no-self-use
      return node not in visited
  
file_path: mars/mars/core/graph/builder/base.py
imports: from abc import ABC, abstractmethod
  from typing import List, Set, Union, Generator
  from ....typing import EntityType
  from ..entity import EntityGraph, TileableGraph, ChunkGraph
label_desc: Use image node_id 4 for calling the AbstractGraphBuilder obj's underlying member method code with example usage: obj._if_add_node(node, visited) and returns: unknown