code: def color_normalize(src, mean, std):
      """Normalize src with mean and std"""
      src -= mean
      src /= std
      return src
  
file_path: mxnet/plugin/opencv/opencv.py
imports: import random
  import ctypes
  import cv2
  import mxnet
  from mxnet.base import _LIB
  from mxnet.base import mx_uint, NDArrayHandle, check_call
label_desc: Use image node_id 7 for calling a global function with example usage: color_normalize(src, mean, std) and returns: src