code: def forward(self, x, skip, output_shape):
      x = F.interpolate(
          x, size=output_shape, mode="bilinear", align_corners=False
      )
      x = x + skip
      x = self.conv(x)
      x = F.relu(x)
  
      return x
  
imports: from collections import defaultdict
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.models import layers
  from paddleseg import utils
  from paddleseg.cvlibs import manager
  from ppmatting.models.losses import MRSD
label_desc: Use image node_id 2 for calling the Up obj's underlying member method code with example usage: obj.forward(x, skip, output_shape) and returns: x