fix LfrCmvn for paraformer (#1097)

Yabin Li

2023-11-16 0c68c942fe84567c48f62b59a0bc0e60d0b29b15

 funasr/models/frontend/abs_frontend.py

@@ -14,4 +14,4 @@
    def forward(
        self, input: torch.Tensor, input_lengths: torch.Tensor
    ) -> Tuple[torch.Tensor, torch.Tensor]:
        raise NotImplementedError
        raise NotImplementedError