code: def normalize_denormalize():
      img = np.linspace(0, 255, 4 * 2 * 3, dtype=np.uint8).reshape(
          4, 2, 3
      )
      mean = img.mean() / 255
      std = img.std() / 255
  
      res = denormalize(
          normalize(img, mean=mean, std=std), mean=mean, std=std
      )
      assert type(res) == type(img)
      assert np.all(res == img)
  
file_path: icevision/tests/utils/test_utils.py
imports: from icevision.all import *
  from icevision.core.record_components import LossesRecordComponent
label_desc: Use image node_id 7 for calling a global function with example usage: normalize_denormalize() without return types