fix bug for contextual train

shixian.shi

2023-11-24 34b2682fba92bf4f8e163d22094e7de57e3290ca

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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