Merge pull request #353 from alibaba-damo-academy/dev_lyb

zhifu gao

2023-04-14 ddfcd68c803c226f4b2a60b0666b29c24d04c259

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from abc import ABC
from abc import abstractmethod
from typing import Tuple
 
import torch
 
 
class AbsNormalize(torch.nn.Module, ABC):
    @abstractmethod
    def forward(
        self, input: torch.Tensor, input_lengths: torch.Tensor = None
    ) -> Tuple[torch.Tensor, torch.Tensor]:
        # return output, output_lengths
        raise NotImplementedError