说明：  这是一本关于最小二乘法非线性优化的问题，涉及了梯度下降法，牛顿法，LM算法等等，通俗易懂而且很容易更加内容直接编写代码，是一本不错的速成教材。
(This is a book on nonlinear least squares optimization problem, involving a gradient descent, Newton, LM algorithm is so easy to understand and easy to write code more content directly is a good quick materials.)