modify grpc environment dependencies

北念

2023-03-02 42f90b4ca1fccc2e1b7bc6d50639ccbb19b87863

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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