code: def test_do_not_preprocess(self) -> None:
      normalization_params = {
          i: NormalizationParameters(feature_type=DO_NOT_PREPROCESS)
          for i in range(1, 5)
      }
      preprocessor = Preprocessor(normalization_params, use_gpu=False)
      postprocessor = Postprocessor(normalization_params, use_gpu=False)
  
      x = torch.randn(3, 4)
      presence = torch.ones_like(x, dtype=torch.uint8)
      y = postprocessor(preprocessor(x, presence))
      npt.assert_allclose(x, y)
  
file_path: ReAgent/reagent/test/preprocessing/test_postprocessing.py
imports: import unittest
  import numpy.testing
  import torch
  from reagent.preprocessing.identify_types import CONTINUOUS_ACTION, DO_NOT_PREPROCESS
  from reagent.preprocessing.normalization import NormalizationParameters
  from reagent.preprocessing.postprocessor import Postprocessor
  from reagent.preprocessing.preprocessor import Preprocessor
label_desc: Use image node_id 2 for calling the TestPostprocessing obj's underlying member method code with example usage: obj.test_do_not_preprocess() without return types