fix wavhead reader; modify punc input to int32; add vad/punc/offline-stream...

lyblsgo

2023-05-08 11f0ed89afb2ec16e022cef0ce50d11c534fe028

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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