[BUG]: The indent of save_model in ppo.py will cause save_model error

[baibaiw5]

🐛 Describe the bug

error indent:

correct indent:

error when save model
│ /home/bmb/projects/ColossalAI/applications/Chat/examples/train_prompts.py:168 in main │
│ │
│ 165 │ │ │ │ update_timesteps=args.update_timesteps) │
│ 166 │ │
│ 167 │ # save model checkpoint after fitting │
│ ❱ 168 │ trainer.save_model(args.save_path, only_rank0=True, tokenizer=tokenizer) │
│ 169 │ # save optimizer checkpoint on all ranks │
│ 170 │ if args.need_optim_ckpt: │
│ 171 │ │ strategy.save_optimizer(actor_optim, │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
AttributeError: 'PPOTrainer' object has no attribute 'save_model'

Environment

No response