code: def _test_stationarity(
      series: Union[TimeSeries, Sequence[TimeSeries]]
  ):
      return all(
          [
              (stationarity_tests(bs[c]) for c in bs.components)
              for bs in series
          ]
      )
  
file_path: darts/darts/explainability/utils.py
imports: from typing import List, Optional, Sequence, Tuple, Union
  from darts import TimeSeries
  from darts.logging import get_logger, raise_if, raise_if_not, raise_log
  from darts.models.forecasting.forecasting_model import ForecastingModel
  from darts.utils.statistics import stationarity_tests
  from darts.utils.utils import series2seq
label_desc: Use image node_id 5 for calling a global function with example usage: _test_stationarity(series) and returns: all