tf.constant.
    *   Add experimental IndexedDatasets.
    *   Add selective registration target using the lite proto runtime.
    *   Add simple Tensor and DataType classes to TensorFlow Lite Java
    *   Add support for bitcasting to/from uint32 and uint64.
    *   Added a subclass of Estimator that can be created from a SavedModel
        (SavedModelEstimator).