Update SDK_advanced.md

Yabin Li

2023-06-29 32f34045acf51b20c39d9e77a9129e1e02df2b29

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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