text: #!/usr/bin/env python3
  # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
  
  """Wrapper to train and test a video classification model."""
  from slowfast.utils.misc import launch_job
  from slowfast.utils.parser import load_config, parse_args
  
  from demo_net import demo
  from test_net import test
  from new_train import train
  from visualization import visualize
  
  
  def main():
      """
      Main function to spawn the train and test process.
      """
      args = parse_args()
      cfg = load_config(args)
  
      # Perform training.
      if cfg.TRAIN.ENABLE:
          launch_job(cfg=cfg, init_method=args.init_method, func=train)
  
      # Perform multi-clip testing.
      if cfg.TEST.ENABLE:
          launch_job(cfg=cfg, init_method=args.init_method, func=test)
  
      # Perform model visualization.
      if cfg.TENSORBOARD.ENABLE and (
          cfg.TENSORBOARD.MODEL_VIS.ENABLE
          or cfg.TENSORBOARD.WRONG_PRED_VIS.ENABLE
      ):
          launch_job(cfg=cfg, init_method=args.init_method, func=visualize)
  
      # Run demo.
      if cfg.DEMO.ENABLE:
          demo(cfg)
  
  
  if __name__ == "__main__":
      main()