code: def test_preemphasis_deemphasis(self):
      di = np.random.rand(11)
      o1 = np_transforms.preemphasis(x=di, coeff=0.95)
      o2 = np_transforms.deemphasis(x=o1, coeff=0.95)
      np.testing.assert_almost_equal(di, o2, decimal=5)
  
imports: import math
  import os
  import unittest
  from dataclasses import dataclass
  import librosa
  import numpy
  from coqpit import Coqpit
  from tests import get_tests_input_path, get_tests_output_path, get_tests_path
  from TTS.utils.audio import numpy_transforms
label_desc: Use image node_id 5 for calling the TestNumpyTransforms obj's underlying member method code with example usage: obj.test_preemphasis_deemphasis() without return types