These two web pages have provide us a range of R package for GPU parallel computation.
Later, I realized that those I posted are actually warnings, the true error is
ld: library not found for -licuuc. So I solved it.
brew info icu4c
I used a piece of code from the second page mentioned above.
I don’t know why but something really wired must be happened. The blog person was using 720M on a laptop. Mine, however, is running 750Ti on desktop.