gguf quantized 2-bit 3-bit 4-bit 5-bit 6-bit 8-bit GGUF text-generation base_model:Etherll/Qwen2.5-Coder-1.5B-CodeFIM base_model:quantized:Etherll/Qwen2.5-Coder-1.5B-CodeFIM region:us imatrix conversational