update contextual export

shixian.shi

2023-09-12 b883a7825680352d0927f4dcb9f3a7807ed0ac63

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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