Update SDK_tutorial_online_zh.md

Yabin Li

2023-09-26 b1b6381cd5ad135f4d5aab7a7ef93b6bfc0e7bb7

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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