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In Hugging Face PEFT libraries, when you save a LoRA adapter (using peft_model.save_pretrained() ), the output directory might contain adapter_model.bin . However, some legacy or custom training scripts (or merged LoRA extraction tools) split the adapter into lora_A.weight and lora_B.weight . When saved manually via torch.save() , lora_B.weight is often stored as up-param.bin . up-param.bin