class_docstr: A residual connection followed by a layer norm.
  Note for code simplicity the norm is first as opposed to last.
code: def forward(self, x, sublayer):
      return x + self.dropout(sublayer(self.norm(x)))
  
imports: import copy
  import math
  import paddle
  from paddle import nn
  from paddle.nn import functional
label_desc: Use image node_id 2 for calling the SubLayerConnection obj's underlying member method code with example usage: obj.forward(x, sublayer) and returns: unknown