code: def normalize(img, mean, std, max_pixel_value=255):
      img = img.astype(np.float32)
      img /= max_pixel_value
  
      mean, std = map(np.float32, [mean, std])
      return (img - mean) / std
  
file_path: icevision/icevision/utils/utils.py
imports: from icevision.imports import *
label_desc: Use image node_id 11 for calling a global function with example usage: normalize(img, mean, std, max_pixel_value) and returns: unknown