dev_yufan egs_mfcca update

yufan-aslp

2023-02-14 a319bf6e5f0a859c8eebb4319276f2a8e327cbf7

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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