gguf quantized GGUF quantization imat imatrix static 16bit 8bit 6bit 5bit 4bit 3bit 2bit 1bit text-generation base_model:mistralai/Mathstral-7B-v0.1 base_model:quantized:mistralai/Mathstral-7B-v0.1 license:apache-2.0 region:us