Hybrid coarse-fine classification for head pose estimation

Benchmark Model Rank Results
head-pose-estimation-on-aflwHybrid Coarse-Fine#3MAE: 5.09
head-pose-estimation-on-aflw2000Hybrid Coarse-Fine#17MAE: 5.395
head-pose-estimation-on-biwiHybrid Coarse-Fine#20MAE (trained with BIWI data): 3.0174