Expose the auxiliary dimension for scalar reduction #117
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Refactor `sumsq() += u * u` into `sumsq(x) += u * u` having only one pixel. It enables CUDA codegen to fuse multiple reduction stages into one single GPU kernel.
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Refactor
sumsq() += u * uintosumsq(x) += u * uhaving only one pixel. It enables CUDA codegen to fuse multiple reduction stages into one single GPU kernel.