update read.md

yhliang

2023-04-13 742d96d8e4260f3d6a0bc4b33a89180e985799e6

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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