code: def session(self):
      if self._session is None:
          self._session = _configure_session()
      return self._session
  
file_path: pytorch-lightning/src/lightning/app/components/database/client.py
imports: from typing import Any, Dict, List, Optional, Type, TypeVar
  import requests
  from requests import Session
  from requests.adapters import HTTPAdapter
  from urllib3.util.retry import Retry
  from lightning.app.components.database.utilities import _GeneralModel
label_desc: Use image node_id 6 for calling the DatabaseClient obj's underlying member method code with example usage: obj.session() and returns: self