code: def unique_ordered(*lists):
      ret = []
      for l in lists:
          for v in l:
              if v not in ret:
                  ret.append(v)
      return ret
  
imports: from __future__ import print_function
  from collections import OrderedDict
  from os.path import abspath, join, dirname, exists
  from utils.common import check_update
  from utils.type_conv import type_from_proto
  import time
  import yaml
label_desc: Use image node_id 18 for calling a global function with example usage: unique_ordered() and returns: ret