Merge branch 'main' into dev_zly

zhifu gao

2023-02-17 6baf10d5d15bed3948459b30567edd3c5898ff84

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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