gguf code quantized GGUF imatrix quantization imat static 16bit 8bit 6bit 5bit 4bit 3bit 2bit 1bit text-generation base_model:NTQAI/Nxcode-CQ-7B-orpo base_model:quantized:NTQAI/Nxcode-CQ-7B-orpo license:other region:us conversational