code: def forward(self, x: paddle.Tensor) -> paddle.Tensor:
      out_list = []
      out = x
      for idx, conv in enumerate(self.conv_list):
          if idx == 0 and self.stride == 2:
              out = self.avd_layer(conv(out))
          else:
              out = conv(out)
          out_list.append(out)
      if self.stride == 2:
          x = self.skip(x)
      return paddle.concat(out_list, axis=1) + x
  
imports: from typing import Union, List, Tuple
  import math
  import paddle
  import paddle.nn
  import stdc1_seg_cityscapes.layers
label_desc: Use image node_id 2 for calling the AddBottleneck obj's underlying member method code with example usage: obj.forward(x) and returns: unknown