update dev_lyh (#982)

yhliang

2023-09-27 9366bd9bcfa093f33e8636e76e668cef6fc2b581

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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