回归任务 均方误差(Mean squared error, MSE) E(f;D)=1m∑i=1m(f(xi)−yi)2 E ( f ; D ) = 1 m ∑ i = 1 m ( f ( x i ) − y i ) 2 均方根误差(Root-Mean-Squared-Error, RMSE) E(f;D)=1m∑i=1m(f(xi)−yi)2−−−−−−−−−−−−−−−√=MSE(f(x