the layer in every exception.

*   Introduce the `tf.compat.v1.keras.utils.track_tf1_style_variables`
    decorator, which enables using large classes of tf1-style variable_scope,
    `get_variable`, and `compat.v1.layer`-based components from within TF2
    models running with TF2 behavior enabled.

*   `tf.data`:

    *   tf.data service now supports auto-sharding. Users specify the sharding