keep blank for english asr result (#623)

zhaomingwork

2023-06-13 4a33f08defa92ac6c9c757dbde06d29d183bf203

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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