L ( y , f ( x ) ) = { 0 , y = f(x) 1 , y ≠ f(x) L(y,f(x)) = \begin{cases} 0, & \text{y = f(x)} \\ 1, & \text{y $\neq$ f(x)} \end{cases} L(y,f(x))={0,1,y = f(x)y = f(x)
L ( y , f ( x ) ) = ∣ y − f ( x ) ∣ L(y,f(x))=|y-f(x)| L(y,f(x))=∣y−f(x)∣
L ( y , f ( x ) ) = ( y − f ( x ) ) 2 L(y,f(x))=(y-f(x))^2 L(y,f(x))=(y−f(x))2
L ( y , f ( x ) ) = l o g ( 1 + e − y f ( x ) ) L(y,f(x))=log(1+e^{-yf(x)}) L(y,f(x))=log(1+e−yf(x))
L ( y , f ( x ) ) = e x p ( − y f ( x ) ) L(y,f(x))=exp(-yf(x)) L(y,f(x))=exp(−yf(x))