class_docstr: Depthwise Conv
code: def forward(self, x):
      return self.pw_conv(self.dw_conv(x))
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle import ParamAttr
  from paddle.regularizer import L2Decay
  from ppdet.core.workspace import register, serializable
  from ppdet.modeling.initializer import conv_init_
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the DWConv obj's underlying member method code with example usage: obj.forward(x) and returns: self