def forward(self, x):
        """Forward function.

        Args:
            x (Tensor | tuple[Tensor]): x could be a torch.Tensor or a tuple of
                torch.Tensor, containing input data for forward computation.
        """
Forward function.

        Args:
            x (Tensor | tuple[Tensor]): x could be a torch.Tensor or a tuple of
                torch.Tensor, containing input data for forward computation.
        
mmpose/mmpose/models/backbones/base_backbone.py