update loading cmvn_file

haoneng.lhn

2023-04-12 00d3f31915f4f1885bd3bd8d128bed8436f7ff8d

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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