def forward(self, feats: Tuple[Tensor]) -> Tensor:
        """Forward the network. The input is multi scale feature maps and the
        output is the heatmap.

        Args:
            feats (Tuple[Tensor]): Multi scale feature maps.

        Returns:
            Tensor: output heatmap.
        """
        feats = feats[-1]
        instance_info = self.iia_module.forward_test(feats, {})
        instance_feats, instance_coords, instance_scores = instance_info
        instance_imgids = torch.zeros(
            instance_coords.size(0), dtype=torch.long, device=feats.device)
        instance_heatmaps = self.gfd_module(feats, instance_feats,
                                            instance_coords, instance_imgids)

        return instance_heatmaps
Forward the network. The input is multi scale feature maps and the
        output is the heatmap.

        Args:
            feats (Tuple[Tensor]): Multi scale feature maps.

        Returns:
            Tensor: output heatmap.
        
mmpose/mmpose/models/heads/heatmap_heads/cid_head.py