message: Replace the usages of `array_ops.pack` with its TF public api.
diff: @@ -34,6 +34,7 @@ from tensorflow.python.keras.layers import core
  from tensorflow.python.keras.layers import normalization
  from tensorflow.python.module import module
  from tensorflow.python.ops import array_ops
  +from tensorflow.python.ops import gen_array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
  @@ -226,7 +227,7 @@ class ListTests(keras_parameterized.TestCase):
  self.assertAllEqual(
  [1., 2., 3.],
  - self.evaluate(array_ops.pack(ListToTensor().l)))
  + self.evaluate(gen_array_ops.Pack(values=ListToTensor().l)))
  class ListWrapperTest(test.TestCase):
  @@ -540,7 +541,7 @@ class TupleTests(keras_parameterized.TestCase):
  self.assertAllEqual(
  (1., 2., 3.),
  - self.evaluate(array_ops.pack(TupleToTensor().l)))
  + self.evaluate(gen_array_ops.Pack(values=TupleToTensor().l)))
  class InterfaceTests(keras_parameterized.TestCase):
  