support hotword txt url input

lzr265946

2023-02-13 83bede2646898271d6df2e306f5879bb31817aa7

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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