code: def __init__(
      self,
      in_channels,
      mid_channels,
      out_channels,
      padding,
      stride,
      kernel_size,
      name=None,
  ):
      super(ExtraBlock, self).__init__()
  
      self.conv0 = Conv2D(
          in_channels=in_channels,
          out_channels=mid_channels,
          kernel_size=1,
          stride=1,
          padding=0,
      )
      self.conv1 = Conv2D(
          in_channels=mid_channels,
          out_channels=out_channels,
          kernel_size=kernel_size,
          stride=stride,
          padding=padding,
      )
  
imports: from __future__ import division
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle import ParamAttr
  from paddle.nn import Conv2D, MaxPool2D
  from ppdet.core.workspace import register, serializable
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 1 to create a new ExtraBlock object from inherited base classes: nn with example: obj = ExtraBlock(in_channels, mid_channels, out_channels, padding, stride, kernel_size, name)