code: def force_fallback_ctx_mgr(fallback_op):
      oldconfig = config.get_force_fallback()
      config.set_force_fallback(fallback_op)
      try:
          yield None
      finally:
          config.set_force_fallback(oldconfig)
  
imports: import unittest
  from torch._lazy.ts_backend import init
  from torch._lazy import config
  from torch._lazy.extract_compiled_graph import extract_compiled_graph
  import torch
  from torch import nn
  import dis
  import inspect
  from torch import fx
  import re
  from contextlib import contextmanager
  import copy
label_desc: Use image node_id 1 for calling a global function with example usage: force_fallback_ctx_mgr(fallback_op) without return types