gguf glm chatglm thudm quantized GGUF quantization imat imatrix static 16bit 8bit 6bit 5bit 4bit 3bit 2bit 1bit text-generation zh en base_model:THUDM/glm-4-9b-chat base_model:quantized:THUDM/glm-4-9b-chat license:other region:us conversational