code: def forward(self, input):
      return paddle.concat([self.main(input), self.skip(input)], axis=1)
  
imports: import math
  from dataclasses import dataclass
  from functools import partial
  import paddle
  import paddle.nn
label_desc: Use image node_id 2 for calling the SkipBlock obj's underlying member method code with example usage: obj.forward(input) and returns: paddle