gguf quantized GGUF quantization imat imatrix static 16bit 8bit 6bit 5bit 4bit 3bit 2bit 1bit text-generation base_model:internlm/internlm2_5-7b-chat-1m base_model:quantized:internlm/internlm2_5-7b-chat-1m license:other region:us conversational