code: def forward(self, inputs):
      children = inputs
      out = self.conv(paddle.concat(inputs, axis=1))
      if self.residual:
          out = paddle.add(x=out, y=children[0])
      out = F.relu(out)
  
      return out
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register, serializable
  from ppdet.modeling.layers import ConvNormLayer
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the Root obj's underlying member method code with example usage: obj.forward(inputs) and returns: out