Actually change constant from 0.5
Actually change constant from 0.5

see explanation in e672deb42197a [formerly 6a0e568de2ab0]


Former-commit-id: c7d4e54faa2b9d85229b76a4d88cf3d1d917b604
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide