only consumer of this field prior to the update.
*   GPU
    *   TF 2.3 includes PTX kernels only for
        [compute capability](https://developer.nvidia.com/cuda-gpus) 7.0 to
        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