Use -O3 optimization by default
Use -O3 optimization by default

-Ofast speeds up training, but it also turns on --fast-math,
which turns on -ffinite-math-only, which assumes everything
is NOT NaN or +-Inf.
So, checks for NaN don't work at all (always return false), and users
may get some NaNs in their embeddings.

stanfordnlp/GloVe,stanfordnlp/GloVe,stanfordnlp/GloVe,stanfordnlp/GloVe