code: def test_itakura_window(self):
      n = 6
      m = 5
      slope = 1.5
  
      window = dtw.Itakura(max_slope=slope)
      window.init_size(n, m)
  
      cells = list(window)
      assert cells == [
          (1, 1),
          (1, 2),
          (2, 1),
          (2, 2),
          (2, 3),
          (3, 1),
          (3, 2),
          (3, 3),
          (3, 4),
          (4, 2),
          (4, 3),
          (4, 4),
          (5, 2),
          (5, 3),
          (5, 4),
          (5, 5),
          (6, 4),
          (6, 5),
      ]
  
      sizes = [(10, 43), (543, 45), (34, 11)]
  
      for n, m in sizes:
          slope = m / n + 1
  
          series1 = tg.sine_timeseries(
              length=n, value_frequency=1 / n, value_phase=0
          )
          series2 = tg.sine_timeseries(
              length=m, value_frequency=1 / m, value_phase=np.pi / 4
          )
  
          dist = dtw.dtw(
              series1, series2, window=dtw.Itakura(slope)
          ).mean_distance()
          assert 1 > dist
  
imports: import matplotlib.pyplot
  import numpy
  import pandas
  import pytest
  from darts.dataprocessing import dtw
  from darts.metrics import dtw_metric, mae, mape
  from darts.timeseries import TimeSeries
  from darts.utils import timeseries_generation
label_desc: Use image node_id 4 for calling the TestDynamicTimeWarping obj's underlying member method code with example usage: obj.test_itakura_window() without return types