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2868d991 - dreambooth: fix #1566: maintain fp32 wrapper when saving a checkpoint to avoid crash when running fp16 (#1618)

dreambooth: fix #1566: maintain fp32 wrapper when saving a checkpoint to avoid crash when running fp16 (#1618) * dreambooth: fix #1566: maintain fp32 wrapper when saving a checkpoint to avoid crash when running fp16 * dreambooth: guard against passing keep_fp32_wrapper arg to older versions of accelerate. part of fix for #1566 * Apply suggestions from code review Co-authored-by: Pedro Cuenca <pedro@huggingface.co> * Update examples/dreambooth/train_dreambooth.py Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com> Co-authored-by: Pedro Cuenca <pedro@huggingface.co>