update m2met2 doc & baseline (#675)

yhliang

2023-06-28 3cc7403b687e4c9832885df3caaea181894a512f

 funasr/layers/inversible_interface.py

@@ -11,4 +11,4 @@
        self, input: torch.Tensor, input_lengths: torch.Tensor = None
    ) -> Tuple[torch.Tensor, torch.Tensor]:
        # return output, output_lengths
        raise NotImplementedError
        raise NotImplementedError