Update SDK_advanced_guide_online_zh.md

Yabin Li

2023-08-08 ca350152777f86c51b8cf114eeb0335a845ebd00

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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