code: def test_invertible_mappers_on_stochastic_series(self):
      vals = np.random.rand(10, 2, 100) + 2
      series = TimeSeries.from_values(vals)
  
      imapper = InvertibleMapper(np.log, np.exp)
      tr = imapper.transform(series)
      inv_tr = imapper.inverse_transform(tr)
  
      np.testing.assert_almost_equal(
          series.all_values(copy=False), inv_tr.all_values(copy=False)
      )
  
file_path: darts/darts/tests/dataprocessing/transformers/test_mappers.py
imports: import numpy
  import pandas
  from darts import TimeSeries
  from darts.dataprocessing.transformers.mappers import InvertibleMapper, Mapper
  from darts.utils.timeseries_generation import constant_timeseries, linear_timeseries
label_desc: Use image node_id 9 for calling the TestMappers obj's underlying member method code with example usage: obj.test_invertible_mappers_on_stochastic_series() without return types