code: def __tensor_flatten__(self):
      return ["_data", "_scale"], None
  
imports: from dataclasses import dataclass
  from typing import Optional
  import torch
  from torch.autograd import Function
  from torch.utils import _pytree
label_desc: Use image node_id 8 for calling the QTensor obj's underlying member method code with example usage: obj.__tensor_flatten__() and returns: list,  None