code: def forward(self, x):
      return _fast_layer_norm(x, self.weight, self.bias, self.epsilon)
  
imports: import torch
  from torch.nn import init
  from apex.contrib.layer_norm.layer_norm import FastLayerNormFN, FastLayerNorm
  import dropout_layer_norm
label_desc: Use image node_id 1 for calling the FastLayerNorm obj's underlying member method code with example usage: obj.forward(x) and returns: _fast_layer_norm