code: def testSetStackReservedUnknownElementShape(self):
      with self.session(), self.test_scope():
          l = list_ops.tensor_list_reserve(
              element_dtype=dtypes.float32,
              element_shape=None,
              num_elements=2,
          )
          l = list_ops.tensor_list_set_item(l, 0, [3.0, 4.0])
          t = list_ops.tensor_list_stack(
              l, element_dtype=dtypes.float32
          )
          self.assertAllEqual(t, [[3.0, 4.0], [0.0, 0.0]])
  
imports: import os
  from absl.testing import parameterized
  import numpy
  from tensorflow.compiler.tests import xla_test
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import list_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 11 for calling the ListOpsTest obj's underlying member method code with example usage: obj.testSetStackReservedUnknownElementShape() without return types