class_docstr: Residual in Residual Dense Block
code: def forward(self, x):
      out = self.RDB1(x)
      out = self.RDB2(out)
      out = self.RDB3(out)
      return out * 0.2 + x
  
imports: import functools
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 2 for calling the RRDB obj's underlying member method code with example usage: obj.forward(x) and returns: unknown