5.1 Losses5.1.1 Loss tricks for deep learning models5.2 Metrics5.2.1 Consistency metrics5.2.2 Offline and online metrics, proxy metrics, and hierarchy of metrics5.3 Design document: Adding losses and metrics5.3.1 Metrics and loss functions for Supermegaretail5.3.2 Metrics and loss functions for PhotoStock Inc.5.3.3 Wrap upSummary