fix vc compatibility (#1091)

cdevelop

2023-11-15 397f4d4b7a9c7b35fa57b1358f076ed0dd718257

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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