Update README.md

Yabin Li

2023-07-14 7c7e1c3a6d0fc58db3e7331873c6600b4bb5b970

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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