code: def is_explored(self):
      return self._is_explored
  
imports: from __future__ import annotations
  from typing import Dict, List
  from evadb.constants import UNDEFINED_GROUP_ID
  from evadb.optimizer.group_expression import GroupExpression
  from evadb.optimizer.property import Property
  from evadb.utils.logging_manager import logger
label_desc: Use image node_id 6 for calling the Group obj's underlying member method code with example usage: obj.is_explored() and returns: self