*   (since v2.7) `tf.nn.ctc_loss` (resolved, possibly in prior release,
            and confirmed with tests)
        *   (since v2.7)`tf.nn.sparse_softmax_crossentropy_with_logits`
    *   (since v2.7) Run `tf.scatter_nd` and other related scatter functions,
        such as `tf.tensor_scatter_nd_update`, on CPU (with significant
        performance penalty).