code: def adjust_range_int8(in_min, in_max):
      in_min = min(0.0, in_min)
      in_max = max(0.0, in_max)
      scale = (in_max - in_min) / 255
      zero = int(-in_min / scale - 128)
      return scale, zero, in_min, in_max
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import math
  from transform.base_converter import DeviceType
label_desc: Use image node_id 1 for calling a global function with example usage: adjust_range_int8(in_min, in_max) and returns: scale,  zero,  in_min,  in_max