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3d74dc2a - [Examples] Add a training script for SDXL DreamBooth LoRA (#4016)

[Examples] Add a training script for SDXL DreamBooth LoRA (#4016) * add dreambooth lora script for SDXL incorporating latest changes. * remove use_auth_token=True. * add: documentation * remove unneeded cli. * increase the number of training steps in the readme. * add LoraLoaderMixin to the subclassing mix. * add sdxl lora dreambooth test. * add: inference code sample. * add: refiner output. * add LoraLoaderMixin to the mix of classes of StableDiffusionXLImg2ImgPipeline. * change default resolution of DreamBoothDataset. * better sdxl report path. * Apply suggestions from code review Co-authored-by: Pedro Cuenca <pedro@huggingface.co> --------- Co-authored-by: Pedro Cuenca <pedro@huggingface.co>