code: def conv3x3(in_planes, out_planes, stride=1):
      """3x3 convolution with padding"""
      return nn.Conv2D(
          in_planes,
          out_planes,
          kernel_size=3,
          stride=stride,
          padding=1,
          bias_attr=False,
      )
  
imports: import math
  import paddle
  from paddle import nn
label_desc: Use image node_id 2 for calling a global function with example usage: conv3x3(in_planes, out_planes, stride) and returns: nn