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288ceebe - [T2I LoRA training] fix: unscale fp16 gradient problem (#6119)

[T2I LoRA training] fix: unscale fp16 gradient problem (#6119) * fix: unscale fp16 gradient problem * fix for dreambooth lora sdxl * make the type-casting conditional. * Apply suggestions from code review Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com> --------- Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>