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29dfe22a - [advanced dreambooth lora sdxl training script] load pipeline for inference only if validation prompt is used (#6171)

[advanced dreambooth lora sdxl training script] load pipeline for inference only if validation prompt is used (#6171) * load pipeline for inference only if validation prompt is used * move things outside * load pipeline for inference only if validation prompt is used * fix readme when validation prompt is used --------- Co-authored-by: linoytsaban <linoy@huggingface.co> Co-authored-by: apolinário <joaopaulo.passos@gmail.com>