code: def hybrid_forward(self, F, x, *args, **kwargs):
      if self.outermost:
          return self.model(x)
      else:
          return nd.concat([x, self.model(x)], 1)
  
imports: import argparse
  import random
  from mxnet import gluon, image, autograd
  from mxnet.gluon.data.vision import transforms
  from mxnet.base import numeric_types
  import gluoncv
  from gluoncv import utils
  from mxnet.gluon.data import DataLoader
  from mxnet.gluon import nn
  import mxnet.ndarray
  import mxnet
  import os
  import numpy
  from mxboard import SummaryWriter
label_desc: Use image node_id 2 for calling the UnetSkipConnectionBlock obj's underlying member method code with example usage: obj.hybrid_forward(F, x) and returns: self, nd