Update SDK_tutorial_zh.md

zhifu gao

2023-07-03 a1dd7e96f53c873a1e4526b1faa4290bb323f281

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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