code: def forward(self, x):
      ffn_output = self.ffn(x)
      ffn_output = gelu_fast(ffn_output)
      ffn_output = self.ffn_output(ffn_output)
      return self.layer_norm(x + ffn_output)
  
imports: import time
  import torch
  from torch import nn
  from hivemind.moe.server.layers.custom_experts import register_expert_class
label_desc: Use image node_id 2 for calling the FeedforwardBlock obj's underlying member method code with example usage: obj.forward(x) and returns: self