code: def forward(self, x):
      h = w = int(sqrt(x.shape[-2]))
      x = rearrange(x, "b (h w) c -> b c h w", h=h, w=w)
      x = self.net(x)
      x = rearrange(x, "b c h w -> b (h w) c")
      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 FeedForward obj's underlying member method code with example usage: obj.forward(x) and returns: x