transformers safetensors qwen2 text-generation chat conversational en arxiv:2407.10671 base_model:Qwen/Qwen2.5-1.5B-Instruct base_model:quantized:Qwen/Qwen2.5-1.5B-Instruct license:apache-2.0 autotrain_compatible text-generation-inference endpoints_compatible 4-bit gptq region:us