code: def infer_type(self, data: pd.DataFrame) -> Union[str, DtypeObj]:
      if self.op.output_type:
          return self.op.output_type
      else:
          # either a symmetrical operator or group by
          return self.children[0].infer_type(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 11 for calling the Feature obj's underlying member method code with example usage: obj.infer_type(data) and returns: self, self