code: def test_needs_preprocessing_2(self):
      df = pd.DataFrame(
          {
              "Onehot1": ["A", "B", "A", "B"],
              "Onehot2": ["C", "D", "C", "D"],
          }
      )
      encoder = ce.OrdinalEncoder(cols=["Onehot1", "Onehot2"]).fit(df)
      df_ord = encoder.transform(df)
  
      res = _needs_preprocessing(
          df_ord.columns, df_ord, preprocessing=encoder
      )
  
      assert res is False
  
imports: import unittest
  from unittest.mock import patch
  import types
  import numpy
  import pandas
  import category_encoders
  from sklearn.ensemble import RandomForestRegressor, RandomForestClassifier
  from pandas.testing import assert_frame_equal, assert_series_equal
  from shapash.backend.base_backend import BaseBackend, _needs_preprocessing
  from shapash.explainer.smart_state import SmartState
label_desc: Use image node_id 11 for calling the TestBaseBackend obj's underlying member method code with example usage: obj.test_needs_preprocessing_2() without return types