*   Enable `map_and_batch_fusion` and `noop_elimination` optimizations by
        default. They can be disabled by configuring
        `tf.data.experimental.OptimizationOptions` to set `map_and_batch =
        False` or `noop_elimination = False` respectively. To disable all
        default optimizations, set `apply_default_optimizations = False`.
    *   Support parallel map in `map_and_filter_fusion`.