[Examples] Support train_text_to_image_lora_sdxl.py (#4365)
* add train_text_to_image_lora_sdxl.py
* add train_text_to_image_lora_sdxl.py
* add test and minor fix
* Update examples/text_to_image/README_sdxl.md
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
* fix unwrap_model rule
* add invisible-watermark in requirements
* del invisible-watermark
* Update examples/text_to_image/README_sdxl.md
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
* Update examples/text_to_image/README_sdxl.md
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
* Update examples/text_to_image/train_text_to_image_lora_sdxl.py
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
* del comment & update readme
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>