code: def __iter__(self):
      return self.window.__iter__()
  
imports: import array
  from abc import ABC, abstractmethod
  from itertools import repeat
  from typing import Tuple
  import numpy
  from .window import CRWindow, Window
label_desc: Use image node_id 6 for calling the SparseCostMatrix obj's underlying member method code with example usage: obj.__iter__() and returns: self