code: def forward(self, inputs):
      x = self.pointwise_conv(inputs)
      x = self.depthwise_conv(x)
      x = self.normal_conv(x)
      return x
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  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 numbers import Integral
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the ExtraBlockDW obj's underlying member method code with example usage: obj.forward(inputs) and returns: x