Is lumina-2.0 script correct?

I wrote a script, based on the one provided [here](https://github.com/huggingface/diffusers/blob/main/examples/dreambooth/train_dreambooth_lora_lumina2.py)

it gets stuck on loss around 0.5, and i think it is a lot, isn't it?

Start with examples/dreambooth/train_dreambooth_lora_lumina2.py, the linked reference script, and compare it with the user's script. The issue does not include that script or a reproducible setup, so first establish whether the reported loss behavior is expected or identify a specific discrepancy; done means documenting the cause or confirming the script is correct.

Scritto dal modello di indicizzazione a partire dal testo della issue.