class_docstr: Visitor which counts the graph nodes.
code: def validate_value(self, value: int):
      pass
  
imports: import abc
  import collections
  import dataclasses
  from typing import Any, Collection, Dict, List, Optional, Tuple
  import pydot
label_desc: Use image node_id 2 for calling the _CountGraphNodes obj's underlying member method code with example usage: obj.validate_value(value) without return types