langchain/experimental/autonomous_agents/autogpt/memory.py/AutoGPTMemory/_get_prompt_input_key
class AutoGPTMemory:    def _get_prompt_input_key(self, inputs: Dict[str, Any]) -> str:
        """Get the input key for the prompt."""
        if self.input_key is None:
            return get_prompt_input_key(inputs, self.memory_variables)
        return self.input_key