code: def get_hash(self) -> str:
      return hashlib.sha256(
          "_".join(
              [self.op.name] + [ch.name for ch in self.children]
          ).encode("utf-8")
      ).hexdigest()[:8]
  
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 3 for calling the Feature obj's underlying member method code with example usage: obj.get_hash() and returns: hashlib