code: def forward(self, x):
      y = self.conv(x)
      y = self.bn(y)
      return y
  
imports: import os
  from typing import Union
  import paddle
  import paddle.nn
  import paddlehub.vision.transforms
  import numpy
  from paddlehub.module.module import moduleinfo
  from paddlehub.module.cv_module import ImageClassifierModule
label_desc: Use image node_id 2 for calling the ConvBN obj's underlying member method code with example usage: obj.forward(x) and returns: y