[Bug] UnslothSFTTrainer is outdated and can not recognize dataset with `["messages"]`

[steveepreston]

In trl SFTTrainer you can pass dataset with only ["messages"] and follows system/user/assistant standard messages style.
but UnslothSFTTrainer is not synced with recent versions of SFTTrainer and have struggle:

 File "/workspace/unsloth-ft/wtf.py", line 45, in <module>
    test_labelonly()
  File "/workspace/unsloth-ft/wtf.py", line 21, in test_labelonly
    trainer = SFTTrainer(
              ^^^^^^^^^^^
  File "/workspace/miniconda3/envs/persona/lib/python3.12/site-packages/unsloth/trainer.py", line 209, in new_init
    original_init(self, *args, **kwargs)
  File "/workspace/unsloth-ft/unsloth_compiled_cache/UnslothSFTTrainer.py", line 1219, in __init__
    super().__init__(
  File "/workspace/unsloth-ft/unsloth_compiled_cache/UnslothSFTTrainer.py", line 628, in __init__
    train_dataset = self._prepare_dataset(
                    ^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/unsloth-ft/unsloth_compiled_cache/UnslothSFTTrainer.py", line 828, in _prepare_dataset
    raise RuntimeError("Unsloth: You must specify a `formatting_func`")
RuntimeError: Unsloth: You must specify a `formatting_func`

[steveepreston]

Issues in unsloth:

unslothai/unsloth#3399

unslothai/unsloth#2658

[steveepreston]

I Edited the unsloth and unsloth-zoo and removed codes to manipulating _prepare_dataset() and error has gone.

[ZoeycircleMa]

@steveepreston would you mind sharing the diff that you did to patch this?

[steveepreston]

@ZoeycircleMa Sorry i don't remember the patch, because bugs of unsloth i switched to native Trainer

[ZoeycircleMa]

no problem, I tried this branch which seemed to fix the problem
unslothai/unsloth#3660