Research Article
Developing a Robust Model Based on the Gaussian Process Regression Approach to Predict Biodiesel Properties
Table 4
The comparison between four kernel functions for PP property from the point of view of statistical quantities.
| Model | Phase | R2 | MRE (%) | MSE | RMSE | STD |
| GPR (Exponential) | Train | 0.982 | 0.00056 | 0.00000 | 0.00195 | 0.00124 | Test | 0.878 | 0.73386 | 6.64170 | 2.57715 | 1.73628 | Total | 0.967 | 0.17651 | 1.59401 | 2.57715 | 1.18811 |
| GPR (Matern) | Train | 0.989 | 0.21290 | 0.54286 | 0.73679 | 0.46621 | Test | 0.889 | 0.55839 | 2.85624 | 1.69004 | 0.80875 | Total | 0.973 | 0.30712 | 1.15081 | 1.69004 | 0.68377 |
| GPR (Squared Exponential) | Train | 1.000 | 0.26262 | 0.86125 | 0.92803 | 0.60432 | Test | 0.968 | 0.52306 | 2.43573 | 1.56068 | 0.72847 | Total | 0.966 | 0.33494 | 1.33190 | 1.56068 | 0.72451 |
| GPR (Rational Quadratic) | Train | 0.984 | 0.25484 | 0.73098 | 0.85497 | 0.51735 | Test | 0.788 | 0.73120 | 6.62593 | 2.57409 | 1.78533 | Total | 0.954 | 0.31634 | 1.90128 | 2.57409 | 1.09967 |
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