code: def forward(self, x):
      norm = x.pow(2).sum(dim=1, keepdim=True).sqrt() + self.eps
      x = x / norm * self.weight.view(1, -1, 1, 1)
      return x
  
file_path: face-alignment/face_alignment/detection/sfd/net_s3fd.py
imports: import torch
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 2 for calling the L2Norm obj's underlying member method code with example usage: obj.forward(x) and returns: x