code: def test_concurrency(self):
      def f():
          pass
  
      outputs = []
  
      tr = TestTranspiler()
      # Note: this is not a test, it's a required invariant.
      assert tr.get_caching_key(None) == tr.get_caching_key(None)
  
      def conversion_thread():
          _, mod, _ = tr.transform(f, None)
          outputs.append(mod.__name__)
  
      threads = tuple(
          threading.Thread(target=conversion_thread) for _ in range(10)
      )
      for t in threads:
          t.start()
      for t in threads:
          t.join()
  
      # Races would potentially create multiple functions / modules
      # (non-deterministically, but with high likelihood).
      self.assertEqual(len(set(outputs)), 1)
  
imports: import threading
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import transformer
  from nvidia.dali._autograph.pyct import transpiler
label_desc: Use image node_id 10 for calling the PyToPyTest obj's underlying member method code with example usage: obj.test_concurrency() without return types