code: def forward(self, x, skip):
      w, h = skip.shape[2], skip.shape[3]
      out = F.interpolate(
          x, size=(w, h), mode="bilinear", align_corners=True
      )
      out = paddle.concat([out, skip], 1)
      return out
  
imports: import numpy
  import math
  import paddle
  import paddle.nn
  from paddle import ParamAttr
  from paddle.nn.initializer import Uniform
  import paddle.nn.functional
  from ppdet.core.workspace import register, serializable
  from ppdet.modeling.layers import ConvNormLayer
  from ppdet.modeling.backbones.hardnet import ConvLayer, HarDBlock
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the TransitionUp obj's underlying member method code with example usage: obj.forward(x, skip) and returns: out