code: def forward(self, x):
      ll = self.HG(x)
      tmp_out = self.Conv1(ll)
  
      if self.use_res:
          ll = self.Conv2(ll)
          tmp_out_ = self.Conv3(tmp_out)
          return x + ll + tmp_out_
  
      else:
          return tmp_out
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 2 for calling the HourGlass obj's underlying member method code with example usage: obj.forward(x) and returns: unknown, tmp_out