strings and takes care of text standardization, tokenization, n-gram
        generation, and vocabulary indexing. See this
        [end-to-end text classification example](https://colab.research.google.com/drive/1RvCnR7h0_l4Ekn5vINWToI9TNJdpUZB3).
    *   Keras `.compile` `.fit` `.evaluate` and `.predict` are allowed to be
        outside of the DistributionStrategy scope, as long as the model was
        constructed inside of a scope.