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f5ccffec - Use `accelerate` save & loading hooks to have better checkpoint structure (#2048)

Use `accelerate` save & loading hooks to have better checkpoint structure (#2048) * better accelerated saving * up * finish * finish * uP * up * up * fix * Apply suggestions from code review * correct ema * Remove @ * up * Apply suggestions from code review Co-authored-by: Pedro Cuenca <pedro@huggingface.co> * Update docs/source/en/training/dreambooth.mdx Co-authored-by: Pedro Cuenca <pedro@huggingface.co> --------- Co-authored-by: Pedro Cuenca <pedro@huggingface.co>