code: def _parse_size_in_M(size_str):
      if size_str[-1] == "B":
          num, unit = size_str[:-2], size_str[-2]
      else:
          num, unit = size_str[:-1], size_str[-1]
      assert unit in SIZE_UNIT, "unknown shm size unit {}".format(unit)
      return float(num) * (1024 ** (SIZE_UNIT.index(unit) - 1))
  
label_desc: Use image node_id 1 for calling a global function with example usage: _parse_size_in_M(size_str) and returns: unknown