Update wav_frontend.py

hnluo

2023-05-31 51e80c166731cf0b06f56fb9a4cb8d07699ef208

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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