error: cannot unpack non-iterable ActionTypeHint object

Bug description

Dear Lightning,

I'm attempting to follow a medium tutorial using my own dataset. I have downgraded lightning due to a suggestion on issue #1915. On step 3 of the tutorial, the fine-tuning step using litgpt, I receive the message "error: cannot unpack non-iterable ActionTypeHint object".

I am on Version 0.5.7 of litgpt and have train.json as well as the checkpoints/mistralai/Mistral-7B-Instruct-v0.3 folders in my working directory

Thus far, I have tried:

• Reading the finetune_lora readme
• installing litgpt[all] as suggested in your documentation, since the medium article only installed litgpt
• modifying the command in the medium article according to the documentation i.e. using: litgpt finetune_lora checkpoints/mistralai/Mistral-7B-Instruct-v0.3 --data JSON --data.json_path train.json --data.val_split_fraction 0.2 --out_dir out/custom-model
• Creating the output directories [either finetuned (medium article), or out/custom-model (documentation)] ahead of running the commands

Appreciate any help that you can provide.

What operating system are you using?

Linux

LitGPT Version

Version: 0.5.7

Start by reproducing the documented litgpt finetune_lora command with train.json, the Mistral checkpoint path, and LitGPT 0.5.7. Compare the tutorial command with the finetune_lora README and the reported Lightning version. Done means identifying the compatibility cause and confirming a working command or documenting the required version or command changes.