code: def main(argv):
      if len(argv) < 3:
          print(usage)
          return 2
      if not glob.glob(argv[0] + ".index"):
          print("Checkpoint %s does not exist" % argv[0])
          return 2
      if not glob.glob(argv[2]):
          print("Transform file %s does not exist" % argv[2])
          return 2
      with open(argv[2], "rb") as csvfile:
          r = csv.reader(csvfile)
          rows = [row for row in r]
      if any(len(row) != 2 for row in rows):
          print(
              "Error %s: each line must have a source and target variable name"
              % (argv[2])
          )
          return 2
      rename_checkpoint_to_partial(argv[0], argv[1], argv[2])
      return 0
  
label_desc: Use image node_id 2 for calling a global function with example usage: main(argv) and returns: int, int, int, int, int