docstr: Test no preprocessing
docstr_tok: ["Test","no","preprocessing"]
code: def test_inverse_transform_1(self):
      """
      Test no preprocessing
      """
      train = pd.DataFrame(
          {"city": ["chicago", "paris"], "state": ["US", "FR"]}
      )
      original = inverse_transform(train)
      pd.testing.assert_frame_equal(original, train)
  
imports: import unittest
  import pandas
  import numpy
  import category_encoders
  import catboost
  import lightgbm
  import xgboost
  from shapash.utils.transform import inverse_transform, apply_preprocessing, get_col_mapping_ce
  from sklearn.ensemble import GradientBoostingClassifier
label_desc: Use image node_id 1 for calling the TestInverseTransformCaterogyEncoder obj's underlying member method code with example usage: obj.test_inverse_transform_1() without return types