def __init__(
        self,
        model_string: str="groq-llama3-70b-8192",
        system_prompt: str=DEFAULT_SYSTEM_PROMPT,
        **kwargs):
        """
        :param model_string:
        :param system_prompt:
        :param base_url: Used to support Ollama
        """
        root = platformdirs.user_cache_dir("textgrad")
        cache_path = os.path.join(root, f"cache_groq_{model_string}.db")
        CachedEngine.__init__(self, cache_path=cache_path)
        
        if os.getenv("GROQ_API_KEY") is None:
            raise ValueError("Please set the GROQ_API_KEY environment variable if you'd like to use Groq models.")
        self.client = Groq(
            api_key=os.getenv("GROQ_API_KEY")
        )
        
        self.model_string = model_string
        self.system_prompt = system_prompt
        assert isinstance(self.system_prompt, str)
        self.is_multimodal = False

        :param model_string:
        :param system_prompt:
        :param base_url: Used to support Ollama
        
textgrad/engine/groq.py