add rwkv encoder

aky15

2023-10-20 ab653d3871f72f7f6cd1ac3126b3df722f4c7943

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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