code: def test_invertible_when_lam2(self):
      y = self.y
      trans = BoxCoxEndogTransformer(lmbda=2.0, lmbda2=2.0)
      y_t, _ = trans.fit_transform(y)
  
      # When we invert, it will not be the same
      y_prime, _ = trans.inverse_transform(y_t)
      assert_array_almost_equal(y, y_prime)
  
file_path: pmdarima/pmdarima/preprocessing/endog/tests/test_boxcox.py
imports: import numpy
  from numpy.testing import assert_array_almost_equal
  from scipy import stats
  import pytest
  from pmdarima.compat.pytest import pytest_error_str
  from pmdarima.preprocessing import BoxCoxEndogTransformer
label_desc: Use image node_id 4 for calling the TestNonInvertibleBC obj's underlying member method code with example usage: obj.test_invertible_when_lam2() without return types