class_docstr: Gather And Expansion Layer with stride 2
class_docstr_tok: ["Gather","And","Expansion","Layer","with","stride","2"]
code: def forward(self, x: paddle.Tensor) -> paddle.Tensor:
      return F.relu(self.branch_1(x) + self.branch_2(x))
  
imports: import os
  from typing import Union, List, Tuple
  import numpy
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddlehub.module.module import moduleinfo
  import paddlehub.vision.segmentation_transforms
  from paddlehub.module.cv_module import ImageSegmentationModule
  import bisenet_cityscapes.layers
label_desc: Use image node_id 2 for calling the GatherAndExpansionLayer2 obj's underlying member method code with example usage: obj.forward(x) and returns: F