*   Add support for TensorArrays to tf.data Dataset.
    *   Switching tf.data functions to use `defun`, providing an escape hatch to
        continue using the legacy `Defun`.
*   Toolchains
    *   CUDNN_INSTALL_PATH, TENSORRT_INSTALL_PATH, NCCL_INSTALL_PATH,
        NCCL_HDR_PATH are deprecated. Use TF_CUDA_PATHS instead which supports a
        comma-separated list of base paths that are searched to find CUDA