Table 3. The classification performance of LibSVM (RBF) classifier using different c and gamma.
| Accuracy/AUC | c=2-5 | c=2-4 | c=2-3 | c=2-2 | c=2-1 | c=20 | c=21 | c=22 | c=23 | c=24 | c=25 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LGG vs. HGG | gamma=2-8 | 0/0 | 0.685/0.685 | 0.730/0.730 | 0.745/0.745 | 0.815/0.815 | 0.880/0.880 | 0.930/0.930 | 0.940/0.940 | 0.945/0.945 | 0.950/0.950 | 0.950/0.950 |
| gamma=2-7 | 0.280/0.280 | 0.725/0.725 | 0.745/0.745 | 0.765/0.765 | 0.850/0.850 | 0.930/0.930 | 0.950/0.950 | 0.950/0.950 | 0.950/0.950 | 0.950/0.950 | 0.950/0.950 | |
| gamma=2-6 | 0.270/0.270 | 0.720/0.720 | 0.750/0.750 | 0.810/0.810 | 0.900/0.900 | 0.940/0.940 | 0.955/0.955 | 0.955/0.955 | 0.955/0.955 | 0.955/0.955 | 0.955/0.955 | |
| gamma=2-5 | 0/0 | 0.595/0.595 | 0.755/0.755 | 0.805/0.805 | 0.885/0.885 | 0.945/0.945 | 0.950/0.950 | 0.950/0.950 | 0.950/0.950 | 0.950/0.950 | 0.950/0.950 | |
| gamma=2-4 | 0/0 | 0/0 | 0.525/0.525 | 0.800/0.800 | 0.830/0.830 | 0.895/0.895 | 0.900/0.900 | 0.900/0.900 | 0.900/0.900 | 0.900/0.900 | 0.900/0.900 | |
| gamma=2-3 | 0/0 | 0/0 | 0/0 | 0/0 | 0.690/0.690 | 0.815/0.815 | 0.835/0.835 | 0.835/0.835 | 0.835/0.835 | 0.835/0.835 | 0.835/0.835 | |
| gamma=2-2 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 | 0.690/0.690 | 0.710/0.710 | 0.710/0.710 | 0.710/0.710 | 0.710/0.710 | 0.710/0.710 | |
| gamma=2-1 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 | 0.120/0.120 | 0.155/0.155 | 0.155/0.155 | 0.155/0.155 | 0.155/0.155 | 0.155/0.155 | |
| Grade II, III, and IV | gamma=2-8 | 0/ 0.250 |
0.235/0.426 | 0.265/0.449 | 0.534/0.651 | 0.770/0.827 | 0.843/0.882 | 0.922/0.941 | 0.946/0.960 | 0.971/0.978 | 0.975/0.982 | 0.971/0.978 |
| gamma=2-7 | 0.005/0.254 | 0.265/0.449 | 0.309/0.482 | 0.765/0.824 | 0.838/0.879 | 0.912/0.934 | 0.946/0.960 | 0.971/0.978 | 0.981/0.985 | 0.981/0.985 | 0.981/0.985 | |
| gamma=2-6 | 0/ 0.250 |
0.265/0.449 | 0.588/0.691 | 0.784/0.838 | 0.853/0.890 | 0.941/0.956 | 0.961/0.971 | 0.966/0.974 | 0.966/0.974 | 0.966/0.974 | 0.966/0.974 | |
| gamma=2-5 | 0/ 0.250 |
0.196/0.397 | 0.598/0.699 | 0.789/0.842 | 0.892/0.919 | 0.951/0.963 | 0.961/0.971 | 0.961/0.971 | 0.961/0.971 | 0.961/0.971 | 0.961/0.971 | |
| gamma=2-4 | 0/ 0.250 |
0/ 0.250 |
0.078/0.309 | 0.750/0.813 | 0.838/0.879 | 0.838/0.879 | 0.907/0.930 | 0.907/0.930 | 0.907/0.930 | 0.907/0.930 | 0.907/0.930 | |
| gamma=2-3 | 0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0.466/0.599 | 0.824/0.868 | 0.828/0.871 | 0.828/0.871 | 0.828/0.871 | 0.828/0.871 | 0.828/0.871 | |
| gamma=2-2 | 0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0.603/0.702 | 0.652/0.739 | 0.652/0.739 | 0.652/0.739 | 0.652/0.739 | 0.652/0.739 | |
| gamma=2-1 | 0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0/ 0.250 |
0.054/0.290 | 0.074/0.305 | 0.074/0.305 | 0.074/0.305 | 0.074/0.305 | 0.074/0.305 | |