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79df5038 - [Training] fix training resuming problem when using FP16 (SDXL LoRA DreamBooth) (#6514)

[Training] fix training resuming problem when using FP16 (SDXL LoRA DreamBooth) (#6514) * fix: training resume from fp16. * add: comment * remove residue from another branch. * remove more residues. * thanks to Younes; no hacks. * style. * clean things a bit and modularize _set_state_dict_into_text_encoder * add comment about the fix detailed.