    def vqa_prompt(self, question, answer=None) -> str:
        """Get the prompt to use for VQA evaluation. If the answer is not provided, it should be left blank to be generated by the model.

        Returns:
            The prompt to use for VQA.
        """
Get the prompt to use for VQA evaluation. If the answer is not provided, it should be left blank to be generated by the model.

Returns:
The prompt to use for VQA.
open_flamingo/eval/eval_model.py