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c2b6df6e60
All cuda `__half` functions are device-only in CUDA 9, including conversions. Host-side conversions were added in CUDA 10. The existing code doesn't build prior to 10.0. All arithmetic functions are always device-only, so there's therefore no reason to use vectorization on the host at all. Modified the code to disable vectorization for `__half` on host, which required also updating the `TensorReductionGpu` implementation which previously made assumptions about available packets. (cherry picked from commit cc3573ab4451853774cd5c3497373d5fe8914774)