code: def test_strided_slice_loop_variant(self):
      x = random_ops.random_uniform([3, 3, 4, 4, 2, 2, 2])
  
      def loop_fn(i):
          x_i = array_ops.gather(x, i)
          return x_i[i : i + 1, ...]
  
      # Test the fallback to while loop for a ConversionNotImplementedError is
      # handled.
      self._test_loop_fn(loop_fn, 3, fallback_to_while_loop=True)
      # Without fallback, ValueError is thrown.
      with self.assertRaisesRegex(
          ValueError, "expected to be loop invariant"
      ):
          self._test_loop_fn(loop_fn, 3, fallback_to_while_loop=False)
  
imports: from tensorflow.python.eager import backprop
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn
  from tensorflow.python.ops import random_ops
  from tensorflow.python.ops import tensor_array_grad
  from tensorflow.python.ops.parallel_for import control_flow_ops
  from tensorflow.python.ops.parallel_for.test_util import PForTestCase
  from tensorflow.python.platform import test
label_desc: Use image node_id 40 for calling the ArrayTest obj's underlying member method code with example usage: obj.test_strided_slice_loop_variant() and returns: x_i