비용함수,cost_function (rev. 1.4)
curr goto 손실함수,loss_function
cost function minimization ¶
cost function minimization을 위해 여러 방법을 쓴다.
gradient descent method: 경사하강,gradient_descent(curr goto 기울기,gradient#s-8)방법
단점: only good for convex_functions.