What is the gradient of the hinge loss squared (truncated quadratic loss) with respect to ? loss = ( max{( 1- y*f(x), 0} ^2

What is the gradient of the hinge loss squared (truncated quadratic loss) with respect to β?

loss = ( max{( 1- y*f(x), 0} ^2 ) where f(x) = x * β + error

Gradient of hinge loss squared (truncated quadratic loss)