def forward(self, x, y):
        """
        Args:
            x (Tensor): The low level feature.
            y (Tensor): The high level feature.
        """
        self.check(x, y)
        x, y = self.prepare(x, y)
        out = self.fuse(x, y)
        return out

        Args:
            x (Tensor): The low level feature.
            y (Tensor): The high level feature.
        
paddleseg/models/layers/tensor_fusion.py