add 2pass online offline select for ws html5 (#557)

zhaomingwork

2023-05-25 2c9e9a69dba5481824f8ce89abe554fd0079b29a

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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