def __call__(self, batch_s: List[str], ref: List[str]) -> List[List[str]]:
        """ Multiply each string in a provided batch of strings.

        Args:
            batch_s: a batch of strings to be multiplied
            ref: a reference to obtain a length of the resulting list

        Returns:
            a multiplied s as list

        """
        res = []
        for s, r in zip(batch_s, ref):
            res.append([s] * len(r))

        return res
 Multiply each string in a provided batch of strings.

        Args:
            batch_s: a batch of strings to be multiplied
            ref: a reference to obtain a length of the resulting list

        Returns:
            a multiplied s as list

        
deeppavlov/models/preprocessors/odqa_preprocessors.py