/** The key of the configuration. e.g. 200 */
    String RANK_FUSION_window_size = "rank.fusion.window_size";

    /** The key of the configuration. e.g. 20 */
    String RANK_FUSION_rank_constant = "rank.fusion.rank_constant";

    /** The key of the configuration. e.g. -1 */
    String RANK_FUSION_THREADS = "rank.fusion.threads";

    /** The key of the configuration. e.g. rf_score */

    available, along with experimental support for multi worker and Cloud TPUs.
    Check out the
    [guide](https://www.tensorflow.org/beta/guide/distribute_strategy) for more
    details.
*   Functions, not Sessions. The traditional declarative programming model of
    building a graph and executing it via a `tf.Session` is discouraged, and
    replaced with by writing regular Python functions. Using the `tf.function`

* Update [SQL Tutorial](https://fastapi.tiangolo.com/tutorial/sql-databases/#create-a-middleware-to-handle-sessions) to close database sessions even when there are exceptions. PR [#89](https://github.com/tiangolo/fastapi/pull/89) by [@alexiri](https://github.com/alexiri).