    def forward(
        self, x: torch.Tensor, offset: Union[int, torch.Tensor] = 0
    ) -> Tuple[torch.Tensor, torch.Tensor]:
        """Just return zero vector for interface compatibility"""
        pos_emb = torch.zeros(1, x.size(1), self.d_model).to(x.device)
        return self.dropout(x), pos_emb
Just return zero vector for interface compatibility
modules/wenet_extractor/transformer/embedding.py