transformers gguf axolotl generated_from_trainer spectrum finetuning Deepspeed MultiGPU autoquant arxiv:2406.06623 base_model:meta-llama/Meta-Llama-3-8B-Instruct base_model:quantized:meta-llama/Meta-Llama-3-8B-Instruct license:llama3 endpoints_compatible region:us conversational