Add sentence timestamp support

dingbig

2023-02-22 bea5d984233aae08d7b9f6a3e8a3f309fae581ad

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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