[fix] fix empty asr result (#1794)

Xingchen Song(宋星辰)

2024-06-07 93a02feda1848531a48a1794a8de12a962c84a8e

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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