*   `tf.keras.optimizers.Optimizer` now points to the new Keras optimizer, and
    old optimizers have moved to the `tf.keras.optimizers.legacy` namespace.
    If you find your workflow failing due to this change,
    you may be facing one of the following issues:

    *   **Checkpoint loading failure.** The new optimizer handles optimizer
        state differently from the old optimizer, which simplies the logic of

  }];

  let description = [{
tensor: The tensor to put on the list.
input_handle: The old list.
output_handle: A list with the elements of the old list followed by tensor.
element_dtype: the type of elements in the list.
element_shape: a shape compatible with that of elements in the list.
  }];

  let arguments = (ins