Use binary numpy save/load instead of txt
When we extract features, we use savetxt, which means we have to use loadtxt when loading in the data gen, which is slow. Save the binary instead so we don't have to do the silly pandas load thing.
When we extract features, we use savetxt, which means we have to use loadtxt when loading in the data gen, which is slow. Save the binary instead so we don't have to do the silly pandas load thing.