code: def test_amplitude_db_conversion(self):
      di = np.random.rand(11)
      o1 = np_transforms.amp_to_db(x=di, gain=1.0, base=10)
      o2 = np_transforms.db_to_amp(x=o1, gain=1.0, base=10)
      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 4 for calling the TestNumpyTransforms obj's underlying member method code with example usage: obj.test_amplitude_db_conversion() without return types