loss function

Definizione

Misura dell’errore di un modello di regressione.

• Linear regression: $\frac{1}{n}\sum _{i=1}^n(y_i-(w^T{x}_i+w_0){)}^2$
• Logistic regression: $\frac{1}{n}\sum _{i=1}^n\log (1+e^{-y_i(w^T{G}_i+w_0)})$
• SVM: $\frac{1}{n}\sum _{i=1}^n\max (0,-y_i(w^T{x}_i+w_0))$

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