code: def forward(self, index):
      a = torch.zeros(2, 2)
      a[0][1] = 1
      a[1][0] = 2
      a[1][1] = 3
      return a[index]
  
imports: import functools
  import os
  from io import BytesIO
  import shutil
  import sys
  import torch
  from torch.jit.mobile import _load_for_lite_interpreter, _export_operator_list
label_desc: Use image node_id 1 for calling the ModelWithTensorOptional obj's underlying member method code with example usage: obj.forward(index) and returns: a