class_docstr: A portal for a tensor.
code: def check_tensor_life(self) -> None:
      if self.tensor_life <= 0:
          raise RuntimeError("tensor in portal has been removed")
  
imports: from typing import List, Optional, Tuple
  import torch
  from torch import Tensor
  from ..copy import Context
  from ..copy import Copy
  from ..phony import get_phony
  from ..stream import AbstractStream, get_device
label_desc: Use image node_id 5 for calling the Portal obj's underlying member method code with example usage: obj.check_tensor_life() without return types