Performance improvements #46
Description
This would slightly differ from the original implementation, however, if we replace all instances of
x += y * z;
with
x = Math.fma(y, z, x);
we can get a huge speedup, for example, replacing all occurrences of this in just the de.bwaldvogel.liblinear.SparseOperator class we can get a 2x speed up on machines with FMA enabled.
However it would require switching to Java 9.