code: def forward(self, x, **kwargs):
      x = self.norm(x)
      x = self.fn(x, **kwargs)
      return self.norm_out(x)
  
imports: import torch
  import torch.nn.functional
  from einops import rearrange
  from torch import nn
label_desc: Use image node_id 2 for calling the PreNorm obj's underlying member method code with example usage: obj.forward(x) and returns: self