code: def _init_marker(int_dtype):
      """use a minimum value that is appropriate to the integer dtype"""
      if int_dtype == cupy.int16:
          # marker = cupy.iinfo(int_dtype).min
          marker = -32768
      elif int_dtype == cupy.int32:
          # divide by two so we don't have to promote other intermediate int
          # variables to 64-bit int
          marker = -2147483648 // 2
      else:
          raise ValueError(
              "expected int_dtype to be either cupy.int16 or cupy.int32"
          )
      return marker
  
imports: import math
  import numbers
  import os
  import cupy
  from ._util import _get_inttype
label_desc: Use image node_id 1 for calling a global function with example usage: _init_marker(int_dtype) and returns: marker