gguf quantized GGUF quantization imat imatrix static 16bit 8bit 6bit 5bit 4bit 3bit 2bit 1bit text-generation ro base_model:OpenLLM-Ro/RoGemma-7b-Instruct base_model:quantized:OpenLLM-Ro/RoGemma-7b-Instruct license:cc-by-nc-4.0 region:us conversational