make some changes for html5 (#674)

zhaomingwork

2023-06-28 488781cf10e63fc62ad618a764e7aa7d390acfcb

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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