code: def transform(self, ctx: Context, test_data):
      transformed_data = self._selection_obj[-1].transform(
          ctx, test_data
      )
      return transformed_data
  
imports: import copy
  import logging
  import math
  import random
  import numpy
  import pandas
  from fate.arch import Context
  from ..abc.module import HeteroModule, Module
label_desc: Use image node_id 4 for calling the HeteroSelectionModuleGuest obj's underlying member method code with example usage: obj.transform(ctx, test_data) and returns: transformed_data