code: def forward(self, x):
      residual = x
  
      x1 = self.conv_block1(x)
      x2 = self.conv_block2(x1)
      x3 = self.conv_block3(x2)
      out = paddle.concat([x1, x2, x3], 1)
  
      if self.dim_in != self.dim_out:
          residual = self.conv_skip(residual)
  
      return residual + out
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 3 for calling the ConvBlock obj's underlying member method code with example usage: obj.forward(x) and returns: unknown