code: def test_pixel_normalize(self):
      means = [2.0] * 3 * 500 * 375
      transformer = PixelNormalize(means)
      self.transformer_test(transformer)
  
imports: import pytest
  import os
  from bigdl.dllib.utils.common import *
  from bigdl.dllib.feature.transform.vision.image import *
  import tempfile
label_desc: Use image node_id 20 for calling the TestLayer obj's underlying member method code with example usage: obj.test_pixel_normalize() without return types