Allow SD3 DreamBooth LoRA fine-tuning on a free-tier Colab (#8762)
* add experimental scripts to train SD3 transformer lora on colab
* add readme
* add colab
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* fix link in the notebook.
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>