code: def fresh_name() -> str:
      """create a new unique name for a variable: v0, v1, v2"""
      global _name
      r = f"v{_name}"
      _name += 1
      return r
  
imports: from typing import Callable, Dict, List, NamedTuple, Optional
  import torch
  import torch._dynamo
  from torch._dynamo.test_case import run_tests, TestCase
  from torch._dynamo.testing import CompileCounter, same
label_desc: Use image node_id 1 for calling a global function with example usage: fresh_name() and returns: r