fix bug in predictor tail_process_fn

lzr265946

2023-02-09 983bb9382ebcbd29c8c59251b4bcbd328bdf3bf1

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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