code: def main():
      args = parse_args()
  
      # load config
      cfg = Config.fromfile(args.config)
      cfg.launcher = args.launcher
      if args.cfg_options is not None:
          cfg.merge_from_dict(args.cfg_options)
  
      # work_dir is determined in this priority: CLI > segment in file > filename
      if args.work_dir is not None:
          # update configs according to CLI args if args.work_dir is not None
          cfg.work_dir = args.work_dir
      elif cfg.get("work_dir", None) is None:
          # use config filename as default work_dir if cfg.work_dir is None
          cfg.work_dir = osp.join(
              "./work_dirs", osp.splitext(osp.basename(args.config))[0]
          )
  
      cfg.load_from = args.checkpoint
  
      # TODO: It will be supported after refactoring the visualizer
      if args.show and args.show_dir:
          raise NotImplementedError(
              "--show and --show-dir cannot be set " "at the same time"
          )
  
      if args.show or args.show_dir:
          cfg = trigger_visualization_hook(cfg, args)
  
      if args.tta:
          cfg.test_dataloader.dataset.pipeline = cfg.tta_pipeline
          cfg.tta_model.module = cfg.model
          cfg.model = cfg.tta_model
  
      # save predictions
      if args.save_preds:
          dump_metric = dict(
              type="DumpResults",
              out_file_path=osp.join(
                  cfg.work_dir,
                  f"{osp.basename(args.checkpoint)}_predictions.pkl",
              ),
          )
          if isinstance(cfg.test_evaluator, (list, tuple)):
              cfg.test_evaluator = list(cfg.test_evaluator)
              cfg.test_evaluator.append(dump_metric)
          else:
              cfg.test_evaluator = [cfg.test_evaluator, dump_metric]
  
      # build the runner from config
      if "runner_type" not in cfg:
          # build the default runner
          runner = Runner.from_cfg(cfg)
      else:
          # build customized runner from the registry
          # if 'runner_type' is set in the cfg
          runner = RUNNERS.build(cfg)
  
      # start testing
      runner.test()
  
file_path: mmocr/tools/test.py
imports: import argparse
  import os
  import os.path
  from mmengine.config import Config, DictAction
  from mmengine.registry import RUNNERS
  from mmengine.runner import Runner
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types