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Learn that the loss is one number saying how wrong the network is. Use cross-entropy for classification and MSE/MAE for regression (numbers).
Builds on: B17 路 Build: Fit a Line with Gradient Descent (calculus in action), B18 路 Build: Spam Classifier with Probabilities (sigmoid, softmax, cross-entropy), S01 路 Build: How Training Works (fit, loss, optimisation)