fix bug for h5 hotwords (#1067)

zhaomingwork

2023-11-08 2e36e738ca39afc8d02f3d11013bd12f937cc874

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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