code: def forward(self, x: paddle.Tensor) -> paddle.Tensor:
      x = self.conv(x)
      left = self.left(x)
      right = self.right(x)
      concat = paddle.concat([left, right], axis=1)
      return self.fuse(concat)
  
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 StemBlock obj's underlying member method code with example usage: obj.forward(x) and returns: self