gguf quantized GGUF imatrix quantization imat static 16bit 8bit 6bit 5bit 4bit 3bit 2bit 1bit text-generation base_model:deepseek-ai/DeepSeek-Coder-V2-Lite-Base base_model:quantized:deepseek-ai/DeepSeek-Coder-V2-Lite-Base license:other region:us conversational