transformers gguf mistral generated_from_trainer en dataset:stingning/ultrachat dataset:openbmb/UltraFeedback arxiv:2305.18290 base_model:HuggingFaceH4/zephyr-7b-alpha base_model:quantized:HuggingFaceH4/zephyr-7b-alpha license:mit text-generation-inference region:us