code: def conv3x3(in_channel, out_channel, stride=1):
      return nn.Conv2D(
          in_channel,
          out_channel,
          kernel_size=3,
          stride=stride,
          padding=1,
          weight_attr=ParamAttr(initializer=KaimingNormal()),
          bias_attr=False,
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  from paddle import ParamAttr
  from paddle.nn.initializer import KaimingNormal
  import paddle.nn
  import paddle.nn.functional
  import numpy
  import math
label_desc: Use image node_id 2 for calling a global function with example usage: conv3x3(in_channel, out_channel, stride) and returns: nn