Machine Learning Loss Functions (Please read a pdf file) 1. Supervised learning 1.1 L1 Loss (= Mean Absolute Error Loss; MAE Loss) 1.2 L2 Loss (= Mean Squared Error Loss; MSE Loss) 2. Unsupervised learning 2.1 Generative Adversarial Network (GAN) 2.2 pix2pix: Conditional GAN (cGAN) 2.3 CycleGAN 2.4 StarGAN