fix tester.cpp

lyblsgo

2023-03-21 84c9b0c3478c18f3dd8bb80f8ffbd15f10c1ac62

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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