Update readme_cn.md

zhifu gao

2023-08-08 d865a499c6e0fa608a089bf03e0c473d81e2c445

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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