Update SDK_tutorial_online.md

ShiLiang Zhang

2023-08-07 9d7c6e75f0b2ab1a5fc6e3a3a795d804fdb0bc8d

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