fix: Revert changes from PR#326 with trl version change

[willmj]

Description of the change

Setting trl to version 0.9.6 causes the following error:

if not args.packing:
            # If we aren't skipping data preparation, then a dataset_text_field
            # or formatting_func must be provided.
            if (
                args.dataset_text_field is None
                and formatting_func is None
                and dataset_kwargs is not None
                and "skip_prepare_dataset" in dataset_kwargs
                and dataset_kwargs["skip_prepare_dataset"]
            ):
>               raise ValueError(
                    "You passed `packing=False` to the SFTTrainer/SFTConfig, but you didn't pass a `dataset_text_field` or `formatting_func` argument."
                )
E               ValueError: You passed `packing=False` to the SFTTrainer/SFTConfig, but you didn't pass a `dataset_text_field` or `formatting_func` argument.

This PR is to temporarily revert the changes in PR #326 until Fabian's qlora fix is in the latest version of trl

Related issue number

How to verify the PR

Was the PR tested

• [ ] I have added >=1 unit test(s) for every new method I have added.
• [ ] I have ensured all unit tests pass

[github-actions[bot]]

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[fabianlim]

@willmj what you pasted seems strange

The comments say that the raise is only when data prep is not skipped

# If we aren't skipping data preparation, then a dataset_text_field
 # or formatting_func must be provided.

But the code triggers when dataset_kwargs["skip_prepare_dataset"] is truthful, which is a contradiction because it should mean to skip the data prep

[willmj]

@fabianlim misunderstood your original comment in #358, closing this PR