code: def mentioned_private_classes(self):
      return [
          klass for klass in PRIVATE_CLASSES if klass in self.raw_doc
      ]
  
imports: from __future__ import annotations
  import argparse
  import doctest
  import importlib
  import json
  import os
  import pathlib
  import subprocess
  import sys
  import tempfile
  import matplotlib
  import matplotlib.pyplot
  from numpydoc.docscrape import get_doc_object
  from numpydoc.validate import Validator, validate
label_desc: Use image node_id 3 for calling the PandasDocstring obj's underlying member method code with example usage: obj.mentioned_private_classes() and returns: unknown