code: def _dtw_exact():
      dtw.dtw(series1, series2, multi_grid_radius=-1).distance()
  
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 2 for calling a global function with example usage: _dtw_exact() without return types