code: def _verify_and_process_inputs(self, x, y):
      if self.targeted:
          assert y is not None
  
      if not self.targeted:
          if y is None:
              y = self._get_predicted_label(x)
  
      x = replicate_input(x)
      y = replicate_input(y)
      return x, y
  
file_path: advertorch/advertorch/attacks/base.py
imports: from abc import ABCMeta
  import torch
  from advertorch.utils import replicate_input
label_desc: Use image node_id 2 for calling the LabelMixin obj's underlying member method code with example usage: obj._verify_and_process_inputs(x, y) and returns: x,  y