Merge pull request #370 from alibaba-damo-academy/dev_lhn2

zhifu gao

2023-04-17 cfc8c117bd0faea95cf979830cccc7e1d904ea5c

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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