code: def test_multivariate_stochastic_series(self):
      transformer = BoxCox()
      vals = np.random.rand(10, 5, 10)
      series = TimeSeries.from_values(vals)
  
      new_series = transformer.fit_transform(series)
      series_back = transformer.inverse_transform(new_series)
  
      # Test inverse transform
      np.testing.assert_allclose(
          series.all_values(), series_back.all_values()
      )
  
file_path: darts/darts/tests/dataprocessing/transformers/test_boxcox.py
imports: from copy import deepcopy
  import numpy
  import pandas
  import pytest
  from darts import TimeSeries
  from darts.dataprocessing.transformers import BoxCox, Mapper
  from darts.utils.timeseries_generation import linear_timeseries, sine_timeseries
label_desc: Use image node_id 6 for calling the TestBoxCox obj's underlying member method code with example usage: obj.test_multivariate_stochastic_series() without return types