docstr: Test basen encoding
docstr_tok: ["Test","basen","encoding"]
code: def test_inverse_transform_13(self):
      """
      Test basen encoding
      """
      train = pd.DataFrame({"city": ["chicago", np.nan]})
      enc = ce.BaseNEncoder(
          handle_missing="value", handle_unknown="value"
      )
      result = enc.fit_transform(train)
      original = inverse_transform(result, enc)
      pd.testing.assert_frame_equal(train, original)
  
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 13 for calling the TestInverseTransformCaterogyEncoder obj's underlying member method code with example usage: obj.test_inverse_transform_13() without return types