code: def device(self):
      return self.weights[0].device
  
imports: import math
  from abc import abstractmethod
  from pathlib import Path
  from typing import List, Literal, Optional, Union
  import os
  import numpy
  from .None import comm
  from .None import profiler
  from .gpt import GptInitModelParameters
  from nebullvm.optional_modules.torch import torch
label_desc: Use image node_id 4 for calling the GptLayerWeights obj's underlying member method code with example usage: obj.device() and returns: self