code: def VGG13(**args):
      model = VGGNet(layers=13, **args)
      return model
  
imports: import paddle
  from paddle import ParamAttr
  import paddle.nn
  import paddle.nn.functional
  from paddle.nn import Conv2D, BatchNorm, Linear, Dropout
  from paddle.nn import AdaptiveAvgPool2D, MaxPool2D, AvgPool2D
  from paddleseg.cvlibs import manager
  import ppmatting
label_desc: Use image node_id 2 for calling a global function with example usage: VGG13() and returns: model