variable metric method meaning in English
可变度量法
可变计量法
Examples
- In the image reconstruction based on optimization without constraint , the variable metric method , the steepest descent method , and conjugate gradient method were applied to image reconstruction to improve iterative efficiency and reconstructed quality , and their virtue and shortcoming were analyzed
摘要在无约束最优化为基础的图像重建问题中，为了提高迭代效率以及重建图像质量，首次提出将变度量法应用到图像重建中。 - Such methods are generally decreasing method , such as , feasible direction methods , constrained variable metric methods , etc . another class is sub - problems method , which approximates the optimal solution by solving a series of simple sub - problems , such as penalty function methods , trust region methods , and successive quadratic programming sub - problems , etc . the same property of two classes of methods is that they determine whether the next iterative point is " good " or " bad " by comparing the objective function value or merit function value at the current point and next iterative point
另一类叫做子问题算法，这种算法是通过一系列简单子问题的解来逼近原问题的最优解，如罚函数法、信赖域算法、逐步二次规划算法等。这两类算法的一个共同特点是，通过比较当前点和下一个迭代点的目标函数值或评价函数值来确定迭代点的“优”或“劣” ，若迭代点比当前点“优”则该迭代点可以被接受，否则须继续搜索或调整子问题。