langchain/chat_models/google_palm.py/ChatGooglePalm/_agenerate
class ChatGooglePalm:    async def _agenerate(
        self,
        messages: List[BaseMessage],
        stop: Optional[List[str]] = None,
        run_manager: Optional[AsyncCallbackManagerForLLMRun] = None,
    ) -> ChatResult:
        prompt = _messages_to_prompt_dict(messages)

        response: genai.types.ChatResponse = await achat_with_retry(
            self,
            model=self.model_name,
            prompt=prompt,
            temperature=self.temperature,
            top_p=self.top_p,
            top_k=self.top_k,
            candidate_count=self.n,
        )

        return _response_to_result(response, stop)