Update SDK_advanced_guide_online.md

Yabin Li

2023-08-16 a657238ad362142cb5b56c47c26cf294884693a8

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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