code: def conv3x3(in_planes, out_planes, stride=1):
      """3x3 convolution with padding"""
      return layer.Conv2d(
          in_planes,
          out_planes,
          3,
          stride=stride,
          padding=1,
          bias=False,
      )
  
imports: from singa import layer
  from singa import model
label_desc: Use image node_id 1 for calling a global function with example usage: conv3x3(in_planes, out_planes, stride) and returns: layer