code: def normalize_pixel_intensity(img, input_low, input_high):
      denominator = input_high - input_low
  
      if denominator == 0:
          # all values are same
          if input_low == 0:
              return img  # output all values are 0
          else:
              return img / input_low  # output all values are 1
  
      return (img - input_low) / denominator
  
file_path: nnabla/python/src/nnabla/utils/image_utils/backend_events/common.py
imports: from __future__ import division, absolute_import
  import numpy
  from nnabla.logger import logger
label_desc: Use image node_id 1 for calling a global function with example usage: normalize_pixel_intensity(img, input_low, input_high) and returns: unknown, img, unknown