transformers safetensors qwen2 text-generation unsloth conversational en arxiv:2409.12122 base_model:Qwen/Qwen2.5-Math-72B-Instruct base_model:quantized:Qwen/Qwen2.5-Math-72B-Instruct license:other autotrain_compatible text-generation-inference endpoints_compatible 4-bit bitsandbytes region:us