code: def _if_add_node(self, node: EntityType, visited: Set):
      return (
          node not in visited and node.key not in self._processed_chunks
      )
  
imports: import dataclasses
  import functools
  from typing import Callable, Dict, Generator, Iterable, List, Optional, Set, Type, Union
  from ....core import FUSE_CHUNK_TYPE, CHUNK_TYPE, TILEABLE_TYPE
  from ....typing import EntityType, TileableType, ChunkType
  from ....utils import copy_tileables, build_fetch
  from ...entity.tileables import handler
  from ...mode import enter_mode
  from ..entity import TileableGraph, ChunkGraph
  from .base import AbstractGraphBuilder
label_desc: Use image node_id 4 for calling the ChunkGraphBuilder obj's underlying member method code with example usage: obj._if_add_node(node, visited) and returns: unknown