gguf mistral quantized 2-bit 3-bit 4-bit 5-bit 6-bit 8-bit GGUF text-generation base_model:HuggingFaceTB/SmolLM2-1.7B-Instruct base_model:quantized:HuggingFaceTB/SmolLM2-1.7B-Instruct region:us imatrix conversational