Merge pull request #217 from alibaba-damo-academy/dev_wjm

zhifu gao

2023-03-13 a4d87a7fff1eccd192b9a3637ecb185b009c7977

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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