update saasr egs and m2met docs

yhliang

2023-05-11 062eb8ff5ae4fde12d9551c2d6f1b64bf39571bd

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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