code: def forward(self, x):
      for attn, ff in self.layers:
          x = attn(x)
          x = ff(x)
      return x
  
imports: from math import sqrt
  import torch
  from torch import nn, einsum
  import torch.nn.functional
  from einops import rearrange, repeat
  from einops.layers.torch import Rearrange
label_desc: Use image node_id 2 for calling the Transformer obj's underlying member method code with example usage: obj.forward(x) and returns: x