code: def test_weak_tensor_in_tf_func(self):
      @def_function.function()
      def f(x):
          return x
  
      t = constant_op.constant(1, dtypes.int32)
      wt = WeakTensor.from_tensor(t)
      res = f(wt)
      self.assertIsInstance(res, WeakTensor)
  
      _ = f(t)
      self.assertEqual(f.experimental_get_tracing_count(), 2)
  
imports: import numpy
  from tensorflow.python.eager import backprop
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import extension_type
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.framework.weak_tensor import EagerWeakTensor
  from tensorflow.python.framework.weak_tensor import GraphWeakTensor
  from tensorflow.python.framework.weak_tensor import WeakTensor
  from tensorflow.python.module import module
  from tensorflow.python.platform import googletest
  from tensorflow.python.saved_model.load import load
  from tensorflow.python.saved_model.save import save
  from tensorflow.python.types import core
label_desc: Use image node_id 7 for calling the WeakTensorTest obj's underlying member method code with example usage: obj.test_weak_tensor_in_tf_func() and returns: x