Include loss balancing techniques

[florence-bockting]

Include loss-balancing techniques e.g., DWA as suggested by Liu et al. (2019)

Liu, S., Johns, E., & Davison, A. J. (2019). End-To-End Multi-Task Learning With Attention. In IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR) (pp. 1871–1880). doi: https://doi.org/10.1109/CVPR.2019.00197