Heavy Ball 方法用迭代算法的角度写出来就是: \begin{align} \bm x_{k+1}&=\bm x_k-h_k\nabla f(\bm x_k)+\underbrace{\alpha_k(\bm x_k-\bm x_{k-1})}_{\text{动量项}} \end{align} 也可以写作: \begin{align} \bm v_{k+1} &= \alpha_k\bm v_k-h_k\nabla f(\bm x...