USAGE: FaceForest [options]
Options:
 -a --annotation          use annotation files.
 -c --config              config file.
 -f --facecascade         openCV face cascade xml file
 -p --pose                head pose config file.
 -h --help                Print usage and exit.
 -m[0,1] --mode[0,1],     mode 0 is training, mode 1 is runtime.
 -i[0,1,2] --video[0,1,2] video port index.
using camera in runtime:
FaceForest -i0 -m1
using annotation file
FaceForest -a
training model
FaceForest -m0