For cpp ws client long file not exited bug (#631)

zhaomingwork

2023-06-15 2962dc83060d948656d0b1e52d1e67ad07afb4f5

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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