class_docstr: Same as Down conv but for the Decoder
class_docstr_tok: ["Same","as","Down","conv","but","for","the","Decoder"]
code: def forward(self, x, skip):
      if skip is not None:
          inp = ME.cat(x, skip)
      else:
          inp = x
      return super().forward(inp)
  
imports: import torch
  import MinkowskiEngine
  import sys
  from .common import NormType, get_norm
  from torch_points3d.core.common_modules import Seq, Identity
label_desc: Use image node_id 2 for calling the ResNetUp obj's underlying member method code with example usage: obj.forward(x, skip) and returns: super