fix paraformer-server for new apis

lyblsgo

2023-05-10 eea2a7689f18ce7ef3b0ab8bd3657f4f6f5cf8e0

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from abc import ABC
from abc import abstractmethod
from typing import Iterator
 
 
class AbsIterFactory(ABC):
    @abstractmethod
    def build_iter(self, epoch: int, shuffle: bool = None) -> Iterator:
        raise NotImplementedError