update SDK_advanced_guide_offline_zh.md

lyblsgo

2023-07-05 c6f1066e2dc89b890ada6b9317cd6c5f24fb2c2e

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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