peft safetensors llava arxiv:1910.09700 base_model:Mantis-VL/llava_siglip_llama3_8b_pretrain_obelics_min_4096 base_model:adapter:Mantis-VL/llava_siglip_llama3_8b_pretrain_obelics_min_4096 4-bit bitsandbytes region:us