src/transformers/models/maskformer/modeling_maskformer.py/MaskFormerFPNLayer/forward
class MaskFormerFPNLayer:    def forward(self, down: Tensor, left: Tensor) -> Tensor:
        left = self.proj(left)
        down = nn.functional.interpolate(down, size=left.shape[-2:], mode="nearest")
        down += left
        down = self.block(down)
        return down