reduce the TF pip binary size. Earlier releases included PTX for a
        variety of older compute capabilities.
    *   Remove environmental variable `TF_USE_CUDNN`.
*   Others
    *   Retain parent namescope for ops added inside
        `tf.while_loop`/`tf.cond`/`tf.switch_case`.
    *   Update `tf.vectorized_map` to support vectorizing `tf.while_loop` and
        TensorList operations.