code: def test_weak_tensor_format_to_string(self):
      # __str__ test in eager mode
      t = constant_op.constant([1.0, 2.0], dtypes.float32)
      wt = WeakTensor(t)
      wt_str = (
          "tf.Tensor([1. 2.], shape=(2,), dtype=float32, weak=True)"
      )
      self.assertEqual(str(wt), wt_str)
  
      # __repr__ test in eager mode
      wt_repr = (
          "<tf.Tensor: shape=(2,), dtype=float32, numpy=array([1., 2.],"
          " dtype=float32), weak=True>"
      )
      self.assertEqual(repr(wt), wt_repr)
  
      @def_function.function()
      def f():
          # __str__ test in graph mode
          t = constant_op.constant([1.0, 2.0], dtypes.float32)
          wt = WeakTensor(t)
          wt_str = (
              'Tensor("Const:0", shape=(2,), dtype=float32, weak=True)'
          )
          self.assertEqual(str(wt), wt_str)
  
          # __repr__ test in graph mode
          wt_repr = "<tf.Tensor 'Const:0' shape=(2,) dtype=float32, weak=True>"
          self.assertEqual(repr(wt), wt_repr)
          return wt
  
      _ = f()
  
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 12 for calling the WeakTensorTest obj's underlying member method code with example usage: obj.test_weak_tensor_format_to_string() and returns: wt