code: def delete_data(self):
      self.data = None
      for child in self.children:
          child.delete_data()
  
imports: import hashlib
  import itertools
  from typing import Dict, List, Optional, Tuple, Union
  import numpy
  import pandas
  from pandas._typing import DtypeObj
  from upgini.autofe.all_operands import find_op
  from upgini.autofe.operand import Operand, PandasOperand
label_desc: Use image node_id 8 for calling the Feature obj's underlying member method code with example usage: obj.delete_data() without return types