support offline inference for unified streaming/non-streaming rnnt

aky15

2023-08-14 a5cd4bb473b19fe2af1753fa7e60a997a8208447

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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