code: def test_get_untransformed_name(self):
      for name, transformed in self.cases:
          assert pm.util.get_untransformed_name(transformed) == name
          with pytest.raises(ValueError):
              pm.util.get_untransformed_name(name)
  
imports: import re
  import arviz
  import numpy
  import pytest
  import xarray
  from cachetools import cached
  import pymc
  from pymc.distributions.transforms import Transform
  from pymc.util import UNSET, _get_seeds_per_chain, dataset_to_point_list, drop_warning_stat, get_value_vars_from_user_vars, hash_key, hashable, locally_cachedmethod
label_desc: Use image node_id 3 for calling the TestTransformName obj's underlying member method code with example usage: obj.test_get_untransformed_name() without return types