fix the issue of hotwords_embedding potentially being a null pointer

雾聪

2023-11-16 74cf8b65b2254eee059f6f599bb6095db5c66001

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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