code: def init(self, device, nhead):
      # device: str. e.g. "cuda:0"
      self.device = torch.device(device)
      assert nhead % 4 == 0
      self.nhead = nhead
  
imports: import random
  import time
  from collections import OrderedDict
  import numpy
  import torch
label_desc: Use image node_id 2 for calling the TestDecorator obj's underlying member method code with example usage: obj.init(device, nhead) without return types