fix asr result is empty and punc error

lzr265946

2023-01-18 ad873c50eed0d97dd3fe3c7f13a5dea9dc4c5369

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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