`tf.linalg.matvec` convenience function.
    *   `tf.einsum()`raises `ValueError` for unsupported equations like
        `"ii->"`.
    *   Add DCT-I and IDCT-I in `tf.signal.dct` and `tf.signal.idct`.
    *   Add LU decomposition op.
    *   Add quantile loss to gradient boosted trees in estimator.
    *   Add `round_mode` to `QuantizeAndDequantizeV2` op to select rounding
        algorithm.

    String ONLINE_HELP_NAME_DICT_SYNONYM = "online.help.name.dict.synonym";

    /** The key of the configuration. e.g. dict */
    String ONLINE_HELP_NAME_DICT = "online.help.name.dict";

    /** The key of the configuration. e.g. kuromoji */
    String ONLINE_HELP_NAME_DICT_KUROMOJI = "online.help.name.dict.kuromoji";

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

    * New documentation about receiving plain `dict`s as request bodies: [Bodies of arbitrary `dict`s](https://fastapi.tiangolo.com/tutorial/body-nested-models/#bodies-of-arbitrary-dicts).
    * New documentation about returning arbitrary `dict`s in responses: [Response with arbitrary `dict`](https://fastapi.tiangolo.com/tutorial/extra-models/#response-with-arbitrary-dict).
    * **Technical Details**: