class_docstr: Compressed row representation window.
  Stores the range of active grid cells in each column.
  Any window with contiguous columns can be expressed as a CRWindow.
  Supports efficient iterative construction and updates.
code: def __iter__(self):
      for i in range(1, self.n + 1):
          start = self.column_ranges[i * 2 + 0]
          end = self.column_ranges[i * 2 + 1]
  
          for j in range(start, end):
              yield i, j
  
imports: import array
  from abc import ABC, abstractmethod
  from math import atan, tan
  from typing import Tuple
  import numpy
  from darts.logging import raise_if, raise_if_not
label_desc: Use image node_id 7 for calling the CRWindow obj's underlying member method code with example usage: obj.__iter__() without return types